Hi all,
Over the weekend I've got a couple of 54512Bs at my desk to seek to bring back to full functionality. My main scope is a 54522A, and I assume they have some commonalities, but I've yet to open mine (it came to me fully refurbished and never needed to open the case). I'm not very familiar with this other series, and hope on some good input and recommendations.
?
The documentation is not as good as others I've seen from HP. Specifically for this unit (54512B), Keysight only seems to have a very skinny (by HP standards) Service Manual which can't honestly be called "module-level Service Manual," as it doesn't really into much detail on the different modules. Then there's a "Front Panel Reference," which is an odd other way of naming what I think is the Operating Manual. A couple other manuals have to do with programming. That's it.?
?
Sometimes in a series you have to look for the main unit, but in this case I'm not sure that's the 54501A, as the catalog spec sheet seems to suggest, or the 54505B, as per the SM. Maybe someone very familiar with the series would know. Artek doesn't have manuals for the 54512B at all, but they do for the 54501A, and if applicable, I'd get the series of six manuals they sell as a bundle. If no go, I'll be a bit in a bind with fixing this given what I have at hand. I am aware HP was not longer offering component SMs by this point, though I don't know for a fact on this specific series and scope (but I do regarding the better?/later? 54522A).?
?
Is this really capable of FFT to 500MHz, even if the scope is rated to 300MHz? I can't make sense of that.?
?
Now, on to the specific issues with the units.?
?
Unit #1 (S/N: 3214A00705)
- Upon starting it, it reports something like "TRYING TO START REALTIME CLOCK," which is unsuccessful after a time countdown from I think 60: "REALTIME CLOCK FAILED TO START - DISABLED."
- Once I get it to display the default screen and output a trace, it stated "Default cal loaded. Re-cal instrument."
- Self Test passes all.?
- I'm also seeing a solid and apparently accurate 5V from the DC Cal output in the back. I haven't tried the AC Cal output.?
- Note this one had the Cal switch in the back in the UNPROTECTED position when I got it.?
- I'm able to display the square wave test signal from the front panel.?
?
Unit #2 (S/N: 3214A00704: consecutive units!)
- Upon staring it, it stated "CALIBRATION FACTOR CHECKSUM ERROR. MOVE REAR PANEL CAL SWITCH TO UNPROTECTED. POWER INSTRUMENT OFF AND THEN ON AGAIN. RE-CAL INSTRUMENT."?
- It also says "Trying to start realtime clock (09290)." Maybe that's an error code???
- Upon switching the rear Cal switch to UNPROTECTED, it boots successfully, goes to a default measurement screen, but gives me a warning "Failed interpolar cal." The trace seems to jump around on Y a bit.?
- Self Test passes all but Timebase. It also displays the same error as default screen ("Failed interpolar cal").?
- 5V out at DC Cal is good.?
- This one had the Cal switch in UNPROTECTED position, so maybe that's why it booted successfully.?
- I'm able to display the square wave test signal from the front panel, though it seems to be offset vertically a bit.?
?
To me, this seems to tell me the battery holding the cal constants is done - going by what I know about my 54522A. It's also possible some Dallas RAMs are out of battery - though I don't know if this uses those for non-volatile memory. I have not yet opened the units, so I've no idea where the rails are, if any caps have leaked, etc. But maybe the information above gives some clues on what's going on, enough to start thinking on it. It also seems the issues are shared very similarly, so maybe that's making the repair more streamlined.?
?
Looking forward to your input.?
?
Thank you,
Radu.?
?
|
Re: Thoughts on Hakko FR301
On 2/24/25 22:29, Sergey Kubushyn wrote: You don't have a vacuum hose to a soldering station but you have a hammer
(motor/turnine) in your very hand that is supposed to do a precise delicate
job of proper positioning, than activating and deactivating vacuum. Then,
you have to struggle with a jump caused by motor rotor inertia when it
starts. Mine doesn't jump at all when triggered. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Thoughts on Hakko FR301
On Tue, 25 Feb 2025, Greg Muir via groups.io wrote: As of no trailing cables it is a misstatement. You STILL have a trailing cable. It doesn't matter if it goes to a soldering station or to a mains outlet. You don't have a vacuum hose to a soldering station but you have a hammer (motor/turnine) in your very hand that is supposed to do a precise delicate job of proper positioning, than activating and deactivating vacuum. Then, you have to struggle with a jump caused by motor rotor inertia when it starts. Now, for a proper desoldering iron you have a cable (which you STILL have on that FR301) and a vacuum hose. The latter is very light and flexible and adds almost nothing to the electrical cable you have no matter what. It is the same diameter as your electrical cable, not a half-inch hose. As of desk tool FR301 is an abomination, having a grace of a sledgehammer without ANY benefits. I personally use Weller desoldering tools with my WR3M and WXR3 soldering stations on my desk. Have both straight and angled ones. They are light, have no start torque, cable/hose is extremely soft, and they have enough juice for 6-layer board. The only reasonable use case for that sledgehammer of desoldering tool is when one has to do some desoldering outside his desk, kinda like in the field. I can't think of such a case but it might exist although it is definitely a very rare one. The only advantage of FR301 over my Weller irons (WXDP120/WXDV120 for WXR3, more juice, and DSX80/DXV80 for WR3M, slightly more delicate and cheaper) is one particular tip they have, an oval one. It is good for desoldering old electrolytic cans (and some parts with flat leads). Unfortunately enough Weller does not make anything like that. Don't know if anybody else does. Same success as Dave previously mentioned.
I exclusively use the FR301 on every job for unsoldering components, etc. It successfully removes all solder from thru holes allowing leaded parts to be removed easily. It also works wonderfully on those boards where poorly experienced designers didn't follow the layout rules making the holes so small that it is nearly a press fit to get the lead to pass through.
Yes, it is somewhat large but the advantage of not having trailing cables or hoses certainly offsets any objections to the size.
I also recommend picking up a few various size tips for it.
Greg --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
|
Re: Thoughts on Hakko FR301
There's a trick if you can do it, for holes connected to ground planes (also works for those not).
You need two irons, one with a very fine tip, and one that is a conventional vacuum desolderer.
put the iron with the fine tip on one side of the board, poking the iron tip through the hole.? (it does take a fine tip)
Put the desoldering tip over the iron tip from the other side of the board, and desolder.
the combined heat keeps the solder molten, heats the whole joint, and cleans out the hole even on ground planes (works on 4 layer boards....)
I used Metcal equipment.
Harvey
toggle quoted message
Show quoted text
On 2/24/2025 9:57 PM, Greg Muir via groups.io wrote: Same success as Dave previously mentioned.
I exclusively use the FR301 on every job for unsoldering components, etc. It successfully removes all solder from thru holes allowing leaded parts to be removed easily. It also works wonderfully on those boards where poorly experienced designers didn't follow the layout rules making the holes so small that it is nearly a press fit to get the lead to pass through.
Yes, it is somewhat large but the advantage of not having trailing cables or hoses certainly offsets any objections to the size.
I also recommend picking up a few various size tips for it.
Greg
On Monday, February 24, 2025 at 01:53:05 PM MST, HP-Agilent-Keysight-equipment@groups.io <digestnoreply@groups.io> wrote:
HP-Agilent-Keysight-equipment@groups.io Digest #5704
Groups.io </>
This is a digest for HP/Agilent/Keysight test equipment. </g/HP-Agilent-Keysight-equipment/topics>. View all your groups.io groups, and edit your subscriptions, here <>.
Do not reply to this email. To reply to a message, click the Reply link under the message.
Topics in this digest:
.
1. Re: 8753C VNA option upgrade (2) <#150407>
2. Re: HP54502A Oscilloscope fail A/D test and cal (2) <#150408>
3. CRT unit for 8593A compatible <#150411>
4. Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A? (2) <#150412>
5. E5052A Power On Test (3.3V Bus Supply) (4) <#150414>
6. HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request <#150415>
messages:
.
1a.
*Re: 8753C VNA option upgrade*
From: N.keyser@... <mailto:N.keyser@...?subject=Re:%208753C%20VNA%20option%20upgrade>
Date: Mon, 24 Feb 2025 08:33:46 MST
Hi Jinxie,
Thank you very much for replying. I am currently in the process of attempting the upgrades: I did receive some feedback on the subject - I just need to ensure that I take the time to properly understand the procedure first.
Thanks again for considering the request
Kind regards
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150407> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%208753C%20VNA%20option%20upgrade> | Reply To Sender <mailto:N.keyser@...?subject=Private:%20Re:%208753C%20VNA%20option%20upgrade> | Mute Topic </mt/111346805/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
1b.
*Re: 8753C VNA option upgrade*
From: Caesar Valenti <mailto:caesarv@...?subject=Re:%208753C%20VNA%20option%20upgrade>
Date: Mon, 24 Feb 2025 09:44:12 MST
Jinxie,
That keyword text is obviously what I wrote to you at some point.? Anyone with an 8753/8752/871x/8720/8719/8722/8702 can write to me (with the s/n) and get the keywords they need to enable any option.? This is a service I provide for free so that no one has to run the risk of unsoldering and programming EEPROMs.
I have been doing this for almost 10 years now and get a request about once or twice per week.
CV
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150410> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%208753C%20VNA%20option%20upgrade> | Reply To Sender <mailto:caesarv@...?subject=Private:%20Re:%208753C%20VNA%20option%20upgrade> | Mute Topic </mt/111346805/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
2a.
*Re: HP54502A Oscilloscope fail A/D test and cal*
From: Mr Lurpak's Electronics Rescue <mailto:rt@...?subject=Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal>
Date: Mon, 24 Feb 2025 08:34:07 MST
Forgot the Fail code is 0000 0000 0101 1110
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150408> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal> | Reply To Sender <mailto:rt@...?subject=Private:%20Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal> | Mute Topic </mt/111347216/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
2b.
*Re: HP54502A Oscilloscope fail A/D test and cal*
From: Mr Lurpak's Electronics Rescue <mailto:rt@...?subject=Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal>
Date: Mon, 24 Feb 2025 08:34:13 MST
Fail code 0000 0000 0101 1110
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150409> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal> | Reply To Sender <mailto:rt@...?subject=Private:%20Re:%20HP54502A%20Oscilloscope%20fail%20A%2FD%20test%20and%20cal> | Mute Topic </mt/111347216/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
3a.
*CRT unit for 8593A compatible*
From: Martin M <mailto:martin@...?subject=Re:%20CRT%20unit%20for%208593A%20compatible>
Date: Mon, 24 Feb 2025 09:44:48 MST
I have a 8593A with a display problem.
There is a spare offered, HP 2090-0514 "for 859x E"
question here: is this full compatible and useful in my 8593A?
thank you
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150411> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20CRT%20unit%20for%208593A%20compatible> | Reply To Sender <mailto:martin@...?subject=Private:%20Re:%20CRT%20unit%20for%208593A%20compatible> | Mute Topic </mt/111360944/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
4a.
*Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?*
From: Richard Parrish <mailto:Richard@...?subject=Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F>
Date: Mon, 24 Feb 2025 10:15:17 MST
If you need accurate measurements, I do have an Andeen-Hagerling 2500E which can measure C @1kHz to better than 5ppm and 8 digits resolution even at 10pF. I rarely get it calibrated but its still the best on the market.
If you decide on what you're going to use as a standard, I'd be glad to measure it for you if you send your standard to me.
Richard
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150412> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F> | Reply To Sender <mailto:Richard@...?subject=Private:%20Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F> | Mute Topic </mt/111340628/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
4b.
*Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?*
From: Greg Muir <mailto:big_sky_explorer@...?subject=Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F>
Date: Mon, 24 Feb 2025 10:48:02 MST
I use a Boonton 76-3A precision decade capacitor for my calibration checks. I originally picked it up for calibration of an old Boonton 72BD meter (0.001 to 2000 pF capacitance range) but it now also serves as a good calibration check on a few HP units that I have. It has capacitance selection from 1 to 1221 pF in 1-2-3-5 x1, x10 & x100 ranges. Accuracy is 0.1% ±0.001 pF. The connections are made through special BNC(M) connectors without outer bayonet shell. But the unit can occasionally can be found in used condition with the Boonton output connector adapter to normal BNC(F) interface or you can make your own.
They sometimes come up pretty inexpensive on ePay amidst the real price gougers.
Greg
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150413> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F> | Reply To Sender <mailto:big_sky_explorer@...?subject=Private:%20Re:%20Accurately%20measuring%201000pF%20and%20100pF%20capacitors%2C%20to%20calibrate%204276A%3F> | Mute Topic </mt/111340628/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
5a.
*E5052A Power On Test (3.3V Bus Supply)*
From: jmr <mailto:jmrhzu@...?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29>
Date: Mon, 24 Feb 2025 11:17:08 MST
I wonder if anyone here has experience or access to an Agilent E5052A signal source analyser? Mine is about 20 years old and is recently showing signs of unreliability.
The main symptom is an occasional power on self test fail and it then reports issues with a 3V3 power supply voltage on the A3 DSP/ADC board where it reads low at typically 2.96V. I think a pass requires >2.96V but this may be firmware dependent. My E5052A is running the latest firmware V2.51.
I think this 3V3 supply is common across the backplane but it gets reported as an A3 test in the service menu. The 5V PSU rail also reads low at between 4.7 and 4.8V but this is still a pass (shows true for the test result)
Also, for several years now it has shown a stubborn internal spurious at 60 kHz at a very low level. This very slightly spoils any phase noise measurements even though it shows up at about -140dBc then the trace is in phase noise mode in dBc/Hz. I'm not sure what causes this internal 60 kHz term, it may be from a PSU or the display or a divided clock. It may be that the 60kHz spurious term is a feature of this analyser as it is present on all my plots dating back over 13 years. It's not caused by anything nearby to the instrument as it does it regardless of position or proximity to other equipment. Plus the other E5052A I've used in the past (in a different location) is exactly the same.
The 60kHz spurious is also present when I swap across to the baseband input even with a very clean LF signal fed to the 0-40 MHz baseband input. So this spurious must be getting in at the ADC if it affects the baseband input as well.
I've seen similar on another E5052A that also shows a lowish 3V3 voltage (but it never shows a power on test failure) and it also has the permanent 60 kHz spurious on all phase noise tests on the main RF input.
The service menu password is only three characters long and is 'kid'
If anyone has access to a healthy E5052A could they enter the service menu and do a manual Power On Test (POT) in the service menus? Then report the 5V and 3.3V results for the A3 module
Mine shows anything from 2.91V to 3.05V and I think the pass/fail threshold for the POT is somewhere around 2.96V. The other E5052A I have some access to shows 2.982V to 3.08V and never reports a POT failure.
Thanks in advance for any replies
Jeremy
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150414> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Reply To Sender <mailto:jmrhzu@...?subject=Private:%20Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Mute Topic </mt/111362931/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
5b.
*Re: E5052A Power On Test (3.3V Bus Supply)*
From: Jim Ford <mailto:james.ford@...?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29>
Date: Mon, 24 Feb 2025 13:08:48 MST
Hi, Jeremy. ?Let me take a look around the labs here at Raytheon. ?Might be an E5052A or two that I could fire up. ?Give me a couple hours.
Jim Ford
Laguna Hills, California, USA
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150416> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Reply To Sender <mailto:james.ford@...?subject=Private:%20Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Mute Topic </mt/111362931/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
5c.
*Re: E5052A Power On Test (3.3V Bus Supply)*
From: jmr <mailto:jmrhzu@...?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29>
Date: Mon, 24 Feb 2025 13:30:07 MST
Hi Jim, thanks.
I've just spent some time fishing around the outside of the chassis with a loop probe and the 60 kHz spurious is from the front of the instrument around the display. It isn't a single tone, it is spread over many kHz on the high side of 60 kHz and looks to be caused by digital traffic. It might be the display causing it. It seems to be at 59 kHz and it may be backlight related but it looks like it has some digital traffic on it.
Probing around the screen area of an E5071B VNA (I think this has the same touch screen display) shows exactly the same waveform so it is definitely screen related in some way. I'm not sure how this is getting into the baseband path but because it is also there on the main phase noise display I think it is getting in at the ADC/DSP module, possibly via a power supply rail. Hopefully a tired decoupling cap is the cause.
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150417> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Reply To Sender <mailto:jmrhzu@...?subject=Private:%20Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Mute Topic </mt/111362931/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
5d.
*Re: E5052A Power On Test (3.3V Bus Supply)*
From: jmr <mailto:jmrhzu@...?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29>
Date: Mon, 24 Feb 2025 13:53:00 MST
Turning the backlight off makes the spurious term go away when probing :)
There is a soft menu button that turns off the backlight and pressing this makes the spurious vanish on the probe (that feeds to another spectrum analyser).
Also if I do a screen grab via Excel and GPIB (with the backlight ON) the 60kHz spurious is present on the spectrum from the baseband input. But if I grab the screen with the backlight off the baseband spectrum is clean on the grabbed screen image in Excel. A huge improvement.
I guess I can live with this when grabbing screen plots as (hopefully) I can add the 'backlight off' command to the excel routine.
So screen grabs will look much better. I'll have a look for the backlight command in the programming guide...
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150418> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Reply To Sender <mailto:jmrhzu@...?subject=Private:%20Re:%20E5052A%20Power%20On%20Test%20%283.3V%20Bus%20Supply%29> | Mute Topic </mt/111362931/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
6a.
*HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request*
From: David Feldman <mailto:wb0gaz@...?subject=Re:%20HP%208660B%2F86602B%20developed%20output%20stability%20problem%2C%20getting-started%20suggestion%28s%29%20request>
Date: Mon, 24 Feb 2025 12:14:12 MST
My HP 8660B/86602B (owned since 1995 - I've owned it longer than it's initial life in industry, I believe) failed to produce a stable output signal when powered up a few days ago (it has worked properly over the years, although it's use is not frequent.) I wish to tackle repair (at least as a learning experience.)
When tested today at some spot CW frequencies (1, 2, 5, 10, 20, 30, 50 and 100 MHz), output signal is below nominal by 200-300 kHz and is not stable (movement around carrier seen on spectrum analyzer display and listing on a receiver yields a noisy and unstable signal.) A swap-out of the 86602B RF plug-in (I have a spare) yielded no difference in behavior.
I have original operator/service manuals for the three key components (the 8660B, 86602B and 11661B frequency extension module inside the 8660B) and associated extension cables/boards (the 11672 service kit and 08660-60070 extender card set), so at least not flying totally blind.
My getting-started question is from this observation:
The 8660B manual's adjustment/test procedures don't mention whether the 11661B frequency extension module's behavior should be considered (as far as I can see, there is no mention of the 11661B in the 8660B manual at all.) It appears to be silent as to whether the 8660B should be evaluated with the 11661B installed (or not.) The 11661B manual focuses on that device and presumably assumes that the 8660B containing it is working normally.
Where (at the 8660B itself or the 11661B FEM) should I start troubleshooting?
Thanks for any suggestions (other than recycling the hardware and replacing it with a TinySA or similar)!
View/Reply Online </g/HP-Agilent-Keysight-equipment/message/150415> | Reply To Group <mailto:HP-Agilent-Keysight-equipment@groups.io?subject=Re:%20HP%208660B%2F86602B%20developed%20output%20stability%20problem%2C%20getting-started%20suggestion%28s%29%20request> | Reply To Sender <mailto:wb0gaz@...?subject=Private:%20Re:%20HP%208660B%2F86602B%20developed%20output%20stability%20problem%2C%20getting-started%20suggestion%28s%29%20request> | Mute Topic </mt/111363979/86192> | Top ^ <#topics> | New Topic </g/HP-Agilent-Keysight-equipment/post>
Groups.io </>
? 2025 Groups.io </>
You are receiving this email because you are subscribed to HP-Agilent-Keysight-equipment@groups.io </g/HP-Agilent-Keysight-equipment> via big_sky_explorer@.... You can unsubscribe here </g/HP-Agilent-Keysight-equipment/leave/3008197/86192/382565666/xyzzy>.
|
Re: Thoughts on Hakko FR301
On 2/24/25 21:57, Greg Muir via groups.io wrote: Same success as Dave previously mentioned.
I exclusively use the FR301 on every job for unsoldering components, etc. It successfully removes all solder from thru holes allowing leaded parts to be removed easily. It also works wonderfully on those boards where poorly experienced designers didn't follow the layout rules making the holes so small that it is nearly a press fit to get the lead to pass through.
Yes, it is somewhat large but the advantage of not having trailing cables or hoses certainly offsets any objections to the size. That's a side effect of one of its biggest strengths: minimal vacuum hose length. The vacuum path from the tip to the pump is only a few inches, as compared to several feet for desoldering systems that house the pump in a base unit. That's a lot of feet of hose to depressurize when the pump turns on, and that hose is typically very flexible, so its walls will deform a bit during pump-down. This results in a slow ramp-up of vacuum, whereas the FR301 supplies a fast rise-time "jolt" of vacuum to the joint. This, in my opinion, is one of the reasons it's so effective. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Thoughts on Hakko FR301
Same success as Dave previously mentioned.
I exclusively use the FR301 on every job for unsoldering components, etc. It successfully removes all solder from thru holes allowing leaded parts to be removed easily. It also works wonderfully on those boards where poorly experienced designers didn't follow the layout rules making the holes so small that it is nearly a press fit to get the lead to pass through.
Yes, it is somewhat large but the advantage of not having trailing cables or hoses certainly offsets any objections to the size.
I also recommend picking up a few various size tips for it.
Greg
On Monday, February 24, 2025 at 01:53:05 PM MST, HP-Agilent-Keysight-equipment@groups.io <digestnoreply@groups.io> wrote:
| | | This is a digest for HP/Agilent/Keysight test equipment.. View all your groups.io groups, and edit your subscriptions, here. | | Do not reply to this email. To reply to a message, click the Reply link under the message. | | | Topics in this digest: | | | | | | | | | 1a.? | Re: 8753C VNA option upgrade
From: N.keyser@...
Date: Mon, 24 Feb 2025 08:33:46 MST
Hi Jinxie, ? Thank you very much for replying. I am currently in the process of attempting the upgrades: I did receive some feedback on the subject - I just need to ensure that I take the time to properly understand the procedure first. ? Thanks again for considering the request ? Kind regards | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | 1b.? | Re: 8753C VNA option upgrade
From: Caesar Valenti
Date: Mon, 24 Feb 2025 09:44:12 MST
Jinxie, ? That keyword text is obviously what I wrote to you at some point.? Anyone with an 8753/8752/871x/8720/8719/8722/8702 can write to me (with the s/n) and get the keywords they need to enable any option.? This is a service I provide for free so that no one has to run the risk of unsoldering and programming EEPROMs. I have been doing this for almost 10 years now and get a request about once or twice per week. CV | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | | | | | | | 4a.? | Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?
From: Richard Parrish
Date: Mon, 24 Feb 2025 10:15:17 MST
If you need accurate measurements, I do have an Andeen-Hagerling 2500E which can measure C @1kHz to better than 5ppm and 8 digits resolution even at 10pF.? I rarely get it calibrated but its still the best on the market. If you decide on what you're going to use as a standard, I'd be glad to measure it for you if you send your standard to me. Richard | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | 4b.? | Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?
From: Greg Muir
Date: Mon, 24 Feb 2025 10:48:02 MST
I use a Boonton 76-3A precision decade capacitor for my calibration checks. I originally picked it up for calibration of an old Boonton 72BD meter (0.001 to 2000 pF capacitance range) but it now also serves as a good calibration check on a few HP units that I have. It has capacitance selection from 1 to 1221 pF in 1-2-3-5 x1, x10 & x100 ranges. Accuracy is 0.1% ±0.001 pF. The connections are made through special BNC(M) connectors without outer bayonet shell. But the unit can occasionally can be found in used condition with the Boonton output connector adapter to normal BNC(F) interface or you can make your own.
They sometimes come up pretty inexpensive on ePay amidst the real price gougers.
Greg | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | 5a.? | E5052A Power On Test (3.3V Bus Supply)
From: jmr
Date: Mon, 24 Feb 2025 11:17:08 MST
I wonder if anyone here has experience or access to an Agilent E5052A signal source analyser? Mine is about 20 years old and is recently showing signs of unreliability. The main symptom is an occasional power on self test fail and it then reports issues with a 3V3 power supply voltage on the A3 DSP/ADC board where it reads low at typically 2.96V. I think a pass requires >2.96V but this may be firmware dependent. My E5052A is running the latest firmware V2.51.
I think this 3V3 supply is common across the backplane but it gets reported as an A3 test in the service menu. The 5V PSU rail also reads low at between 4.7 and 4.8V but this is still a pass (shows true for the test result)
Also, for several years now it has shown a stubborn internal spurious at 60 kHz at a very low level. This very slightly spoils any phase noise measurements even though it shows up at about -140dBc then the trace is in phase noise mode in dBc/Hz. I'm not sure what causes this internal 60 kHz term, it may be from a PSU or the display or a divided clock. It may be that the 60kHz spurious term is a feature of this analyser as it is present on all my plots dating back over 13 years. It's not caused by anything nearby to the instrument as it does it regardless of position or proximity to other equipment. Plus the other E5052A I've used in the past (in a different location) is exactly the same.
The 60kHz spurious is also present when I swap across to the baseband input even with a very clean LF signal fed to the 0-40 MHz baseband input. So this spurious must be getting in at the ADC if it affects the baseband input as well.
? I've seen similar on another E5052A that also shows a lowish 3V3 voltage (but it never shows a power on test failure) and it also has the permanent 60 kHz spurious on all phase noise tests on the main RF input. ? The service menu password is only three characters long and is 'kid' ? If anyone has access to a healthy E5052A could they enter the service menu and do a manual Power On Test (POT) in the service menus? Then report the 5V and 3.3V results for the A3 module Mine shows anything from 2.91V to 3.05V and I think the pass/fail threshold for the POT is somewhere around 2.96V. The other E5052A I have some access to shows 2.982V to 3.08V and never reports a POT failure. Thanks in advance for any replies Jeremy | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | | | 5c.? | Re: E5052A Power On Test (3.3V Bus Supply)
From: jmr
Date: Mon, 24 Feb 2025 13:30:07 MST
Hi Jim, thanks. I've just spent some time fishing around the outside of the chassis with a loop probe and the 60 kHz spurious is from the front of the instrument around the display. It isn't a single tone, it is spread over many kHz on the high side of 60 kHz and looks to be caused by digital traffic. It might be the display causing it. It seems to be at 59 kHz and it may be backlight related but it looks like it has some digital traffic on it.? ? Probing around the screen area of an E5071B VNA (I think this has the same touch screen display) shows exactly the same waveform so it is definitely screen related in some way. I'm not sure how this is getting into the baseband path but because it is also there on the main phase noise display I think it is getting in at the ADC/DSP module, possibly via a power supply rail. Hopefully a tired decoupling cap is the cause. | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | 5d.? | Re: E5052A Power On Test (3.3V Bus Supply)
From: jmr
Date: Mon, 24 Feb 2025 13:53:00 MST
Turning the backlight off makes the spurious term go away when probing :) ? There is a soft menu button that turns off the backlight and pressing this makes the spurious vanish on the probe (that feeds to another spectrum analyser). ? Also if I do a screen grab via Excel and GPIB (with the backlight ON) the 60kHz spurious is present on the spectrum from the baseband input. But if I grab the screen with the backlight off the baseband spectrum is clean on the grabbed screen image in Excel. A huge improvement. ? I guess I can live with this when grabbing screen plots as (hopefully) I can add the 'backlight off' command to the excel routine. ? So screen grabs will look much better. I'll have a look for the backlight command in the programming guide... | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | 6a.? | HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request
From: David Feldman
Date: Mon, 24 Feb 2025 12:14:12 MST
My HP 8660B/86602B (owned since 1995 - I've owned it longer than it's initial life in industry, I believe) failed to produce a stable output signal when powered up a few days ago (it has worked properly over the years, although it's use is not frequent.) I wish to tackle repair (at least as a learning experience.)
When tested today at some spot CW frequencies (1, 2, 5, 10, 20, 30, 50 and 100 MHz), output signal is below nominal by 200-300 kHz and is not stable (movement around carrier seen on spectrum analyzer display and listing on a receiver yields a noisy and unstable signal.) A swap-out of the 86602B RF plug-in (I have a spare) yielded no difference in behavior.
I have original operator/service manuals for the three key components (the 8660B, 86602B and 11661B frequency extension module inside the 8660B) and associated extension cables/boards (the 11672 service kit and 08660-60070 extender card set), so at least not flying totally blind.
My getting-started question is from this observation:
The 8660B manual's adjustment/test procedures don't mention whether the 11661B frequency extension module's behavior should be considered (as far as I can see, there is no mention of the 11661B in the 8660B manual at all.) It appears to be silent as to whether the 8660B should be evaluated with the 11661B installed (or not.) The 11661B manual focuses on that device and presumably assumes that the 8660B containing it is working normally.
Where (at the 8660B itself or the 11661B FEM) should I start troubleshooting?
Thanks for any suggestions (other than recycling the hardware and replacing it with a TinySA or similar)! | | View/Reply Online | Reply To Group | Reply To Sender | Mute Topic | Top ^ | New Topic | | | | | | | | | You are receiving this email because you are subscribed to HP-Agilent-Keysight-equipment@groups.io via big_sky_explorer@.... You can unsubscribe here. | |
|
Re: Thoughts on Hakko FR301
On 2/24/25 20:20, Bruce wrote: I have a job that requires removing a 56 pin PCB connector from an HP 6 (or so) layer motherboard.
I'm considering the Hakkp FR301 desoldering tool - if anyone has experience using this tool for a similar job, I'd like to hear about it.? In particular is it capable of supplying adequate heat for a job like this.
If you have experience, please speak up! I've had an FR301 for a few years, and I love it. It makes short work of desoldering most anything. However, six layers will present a challenge for most any desoldering tool, as you'll have to dump so much heat into the joint that you'll heat up everything that surrounds it. Yes, an FR301 can supply plenty of heat. There's no doubt at all about that. Do you need to preserve the 56-pin connector? If not, what I'd do is try to cut the connector apart and reduce the number of pins that need to be pulled out simultaneously, a sort of divide-and-conquer approach. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Thoughts on Hakko FR301
Bruce, The FR301 is capable of delivering plenty of heat, no question about that. What I never liked about it, and the reason I sold mine, is it provides the finesse to handling or a... hammer. Which it literally is.?
I know there's plenty of fans of the FR301, and I understand that, but I've personally moved on to Pace desoldering fixtures and never looked back. They give me all the heat I may want and provide a lot of dexterity and fine handling at the tip. Far less likelihood?of damaging boards and lifting traces and such.?
In my case, my FR301 must've been a lemon, as I had a heater failure I think within the first year of duty - which?I didn't appreciate?from a relatively?pricey tool - and had some more minor issues with clogged tips and stuff like that.?
I am sure it may work perfectly fine for you, and the heat it's capable of delivering is good for just about any situation you may encounter.?
Hope this helps a bit. Radu.?
I have a job that requires removing a 56 pin PCB connector from an HP 6 (or so) layer motherboard.
?
I'm considering the Hakkp FR301 desoldering tool - if anyone has experience using this tool for a similar job, I'd like to hear about it.? In particular is it capable of supplying adequate heat for a job like this.
?
If you have experience, please speak up!
?
Cheers!
?
Bruce
?
|
Re: HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request
Set the frequency to 0.0 MHz.? ? Does the RF level meter in the RF section go to zero??
?
The phase lock loop that most often needed adjustment is the 350 to 450 MHz loop (in the swing-out assy on top).? Check its output with the small spectrum analyzer or a counter.? ? This loop goes moves in 10 MHz steps.? I probably adjusted these a few hundred times as the VCO would drift out of capture range.? ?Every time an 8660 would come in for anything I'd check its adjustments.? ?
The other smaller step-size loops were more stable or at least less problematic.? ?They also had pre-tuning to push the VCO closer to nominal range.? ??
?
Definitely check the power supplies first if you have not already (use a scope to check for ripple).?
?
If you had an 86601A RF section, 350-450 loop is still required as you might already know.? ? ?
?
If this was still the mid to late 90's I'd be of much better help.? ? I was the last tech in the HP repair center in New Jersey to work on these old sig gens before all the HP service centers were consolidated to CA.??
?
?
|
Re: HP 8660B/86602B developed output stability problem, getting-started suggestion(s) request
First experiment - swapped 11661B module with a supposedly-OK "just in case" spare I had picked up a long time ago (with understanding that the 11661B manual has an adjustment procedure to use when module swap/move occurs, which I didn't perform).
The output problem remains (fluctuating around 100-200 kHz below the set frequency), so taking this as a clue that the 11661B is not necessarily the problem, and starting into the fault finding tree in the 8660B manual.
|
Re: Thoughts on Hakko FR301
I have a job that requires removing a 56 pin PCB connector from an HP 6 (or so) layer motherboard.
?
I'm considering the Hakkp FR301 desoldering tool - if anyone has experience using this tool for a similar job, I'd like to hear about it.? In particular is it capable of supplying adequate heat for a job like this.
?
If you have experience, please speak up!
?
Cheers!
?
Bruce
?
|
Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?
Well, I just picked up an Arco SS-32 Precision Standard Capacitor Set for the equivalent of about $75 all up, so that's a start. It has some missing values and a number of doubled up values too (maybe it is a set built up from values laying around rather than a 'complete set'), but the price was good anyway. Once I get it in my hands, I can see how each standard is constructed, and once I get my gear calibrated, I can complete the set with my own DIY capacitors.
It seems to have become the Electrocube ss-32 at some point, so at least parts are still available... Stated at 0.1 - 0.5%, so sort-of getting close to what I need, closer than I was yesterday anyway...
https://www.electrocube.com/pages/ds-pfc-precision-film-capacitors-and-standards-data-sheets
?
My set doesn't have a 1000pF cap, but it does have a 100pF cap, so I'm now halfway there sort of, just need to get these caps all measured and such.
?
?
@Richard Parrish, where abouts are you located?
?
?
Thanks all for the info so far! Greatly appreciated. :)
?
?
?
?
Jared
?
?
?
?
?
|
Re: 8753C VNA option upgrade
Hi Caesar,
?
I hope you're well. Yes, now I remember that did come from you. Thank you so much for the service you provide, you're a credit to the community!
?
J.
|
Re: HP Agilent 8753ES VNA repair [Help]
Hi, ? To make a first comparison, here is the output of my 8753ES at 1GHz, CW mode, 0dBm output, Trigger HOLD, measured on a Spectrum. ? If you have a similar image, the PLL A11 would be correct. You do not have an UNLOCK message, this means that you have enough signal to maintain synchronization. ? If the signal going to the sampler R was attenuated, the average during an S11 measurement would give an average signal offset from the reference (when nothing is connected to port #1). But looking at your image, test S11, nothing connected to port #1, apart from the noise everything seems correct. ? Do a test from 30kHz to 250kHz, the A11 module is bypassed, if the problem persists, A11 is not the cause. ? Either the problem comes from A7, or it is further away like on the IF DIGITAL. ? Make measurements on the samplers separately, MEAS A, B and R. Do you have the noise problem on all samplers. ? I will wait for your answer, and I will be able to make comparative measurements on my VNA 8753ES. ? Yves ? 
? 
? ? 
|
Re: E5052A Power On Test (3.3V Bus Supply)
Sounds about right. ?60 kHz is right in the range of a switching regulator of that era.
I didn’t find a signal source analyzer around the particular lab I frequent, but I’d be very surprised if there weren’t one somewhere in this building. ?Literally tons of vintage test equipment lying around here, much of it from the old Hughes Aircraft days. ?Glad you at least figured out where the spur was coming from.
Jim
toggle quoted message
Show quoted text
On Feb 24, 2025, at 12:53?PM, jmr via groups.io <jmrhzu@...> wrote:
? Turning the backlight off makes the spurious term go away when probing :)
?
There is a soft menu button that turns off the backlight and pressing this makes the spurious vanish on the probe (that feeds to another spectrum analyser).
?
Also if I do a screen grab via Excel and GPIB (with the backlight ON) the 60kHz spurious is present on the spectrum from the baseband input. But if I grab the screen with the backlight off the baseband spectrum is clean on the grabbed screen image in Excel. A huge improvement.
?
I guess I can live with this when grabbing screen plots as (hopefully) I can add the 'backlight off' command to the excel routine.
?
So screen grabs will look much better. I'll have a look for the backlight command in the programming guide...
|
HP Agilent 8753ES VNA repair [Help]
Hi everyone,
?
I am looking for some help on the repair of my 8753 VNA.?
I took some time trying to find the problem it myself with the service manual without success.?
The unit was working great and failed during my last filter mesurement. The signal is now noisy on port 1 and 2 (in S11,S22 ans S21), even if I do a new calibration.?
I have no error on power on. Have you ever entered this type of failure ?
I was first thinking of an ESD failure but it do not seems to be the case.?
The two input couplers mesure OK. I have 16 dB of coupling loss on port 1 and port 2. Visual inspection do not show any damage on the RF patch.?
The solid state switch also seems to be OK. I have 2 dB of loss between the input and the two output of the SP2T.?
In span zero mode I mesure a RF signal at the right frequency in the 1 MHz- 6 GHz band. Output power is also OK. The stepped attenuator seems to be Ok, signal source is there.?
The only problem I can see here is when I look at the RF out signal on a spectrum analyser, the RF signal do not seems to be locked. ?
When I reduce the SPAN on the VNA, I can see a lot of spike on the response.?
From what I understand, I now need to check the ?A7 Pulse generator diode stage and the A11 Phase lock board. The red LED on the A11 board is blinking but do not stay ON.
?
Could you help me from this point on this repair ? Thank you ??
?
S11 signal, port 1 open SPAN 6 GHz:
?
S11 signal, port 1 50 Ohms load, ?SPAN 6 GHz:
?
S11 signal OPEN SPAN 1 MHz
?
S11 Signal SPAN 6GHz with 50 ohms load
?
?
|
Re: Accurately measuring 1000pF and 100pF capacitors, to calibrate 4276A?
Both your 4276a and 4263b can measure ESR. So you may take the Henry Parsons Hall way, which he did at general radio with the digibridges:
First he calibrates the measurement-frequency deviation.
Secound he uses calibrated resistors and no capacitors for calibration.
?
For your case: Check the oscillator frequency for drift.
Then take your calibration resistors and measure them with your 34461a. Now measure and tweak your 100pF and 1000pF calibation capacitors until your calibrations resistors measure the same values on the 4276a as on the 34461a.
Build from relative new (post year 2000) high voltage foil or Y2 capacitors - they have very low D, but D is never nagative.
Check with your 4263b and DER-EE 5000 - both with short and open calibration.
?
By the way: my 4274a/4275a did not drift out of spec in the mid ranges, for me f > 1 MHz ranges are hard to check . Maybe the 4276a behaves the same, if you didn't tweek it. My 4263b drifted less then 1%, but more then the 4274a, if i remember correct. But all are not in the class of the genrad 1689 which has the most simple design and calibration procedure and like the 4274a no special parts.
(the 4274a/4275a are a repair nightmare compared to the digibridges, but have the better user interface).
?
?
|
Re: E5052A Power On Test (3.3V Bus Supply)
Turning the backlight off makes the spurious term go away when probing :)
?
There is a soft menu button that turns off the backlight and pressing this makes the spurious vanish on the probe (that feeds to another spectrum analyser).
?
Also if I do a screen grab via Excel and GPIB (with the backlight ON) the 60kHz spurious is present on the spectrum from the baseband input. But if I grab the screen with the backlight off the baseband spectrum is clean on the grabbed screen image in Excel. A huge improvement.
?
I guess I can live with this when grabbing screen plots as (hopefully) I can add the 'backlight off' command to the excel routine.
?
So screen grabs will look much better. I'll have a look for the backlight command in the programming guide...
|
Re: E5052A Power On Test (3.3V Bus Supply)
Hi Jim, thanks.
I've just spent some time fishing around the outside of the chassis with a loop probe and the 60 kHz spurious is from the front of the instrument around the display. It isn't a single tone, it is spread over many kHz on the high side of 60 kHz and looks to be caused by digital traffic. It might be the display causing it. It seems to be at 59 kHz and it may be backlight related but it looks like it has some digital traffic on it.?
?
Probing around the screen area of an E5071B VNA (I think this has the same touch screen display) shows exactly the same waveform so it is definitely screen related in some way. I'm not sure how this is getting into the baseband path but because it is also there on the main phase noise display I think it is getting in at the ADC/DSP module, possibly via a power supply rail. Hopefully a tired decoupling cap is the cause.
|
Re: E5052A Power On Test (3.3V Bus Supply)
Hi, Jeremy. ?Let me take a look around the labs here at Raytheon. ?Might be an E5052A or two that I could fire up. ?Give me a couple hours.
Jim Ford? Laguna Hills, California, USA
toggle quoted message
Show quoted text
On Feb 24, 2025, at 10:17?AM, jmr via groups.io <jmrhzu@...> wrote:
?
I wonder if anyone here has experience or access to an Agilent E5052A signal source analyser? Mine is about 20 years old and is recently showing signs of unreliability.
The main symptom is an occasional power on self test fail and it then reports issues with a 3V3 power supply voltage on the A3 DSP/ADC board where it reads low at typically 2.96V. I think a pass requires >2.96V but this may be firmware dependent. My E5052A is running the latest firmware V2.51.
I think this 3V3 supply is common across the backplane but it gets reported as an A3 test in the service menu. The 5V PSU rail also reads low at between 4.7 and 4.8V but this is still a pass (shows true for the test result)
Also, for several years now it has shown a stubborn internal spurious at 60 kHz at a very low level. This very slightly spoils any phase noise measurements even though it shows up at about -140dBc then the trace is in phase noise mode in dBc/Hz. I'm not sure what causes this internal 60 kHz term, it may be from a PSU or the display or a divided clock. It may be that the 60kHz spurious term is a feature of this analyser as it is present on all my plots dating back over 13 years. It's not caused by anything nearby to the instrument as it does it regardless of position or proximity to other equipment. Plus the other E5052A I've used in the past (in a different location) is exactly the same.
The 60kHz spurious is also present when I swap across to the baseband input even with a very clean LF signal fed to the 0-40 MHz baseband input. So this spurious must be getting in at the ADC if it affects the baseband input as well.
?
I've seen similar on another E5052A that also shows a lowish 3V3 voltage (but it never shows a power on test failure) and it also has the permanent 60 kHz spurious on all phase noise tests on the main RF input.
?
The service menu password is only three characters long and is 'kid'
?
If anyone has access to a healthy E5052A could they enter the service menu and do a manual Power On Test (POT) in the service menus? Then report the 5V and 3.3V results for the A3 module
Mine shows anything from 2.91V to 3.05V and I think the pass/fail threshold for the POT is somewhere around 2.96V. The other E5052A I have some access to shows 2.982V to 3.08V and never reports a POT failure.
Thanks in advance for any replies
Jeremy
|
Dave McGuire
Sergey Kubushyn
Jared Cabot
Jinxie
MattSNE