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Re: 8562E adventures
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hello Peter Yes of course The original one drift 2-3Mhz and the loop is designed for 10Mhz drift the Avantek drift 40Mhz due to heating of the YIG it self
but very interested in how you got it working. did you test cold and hot ?
best regards Peter
Fra: [email protected] <[email protected]> p? vegne af Peter Gottlieb <hpnpilot@...>
Sendt: 21. marts 2024 12:28 Til: [email protected] <[email protected]> Emne: Re: [HP-Agilent-Keysight-equipment] 8562E adventures ?
Did you connect up the internal PTC heater?
On 3/21/2024 6:21 AM, Peter Hansen wrote: > Hello Peter what about drift I tried to mod a avantek YIG of the same type but > I always end up with the drift of the YIG beeing greater than the Loop will > handle and with occational you can choose between cold and hot for it to throw > a Err301 YIG loop unlock. > maybe you have done something I have not mastered. > 73 Peter OZ1LPR > -------------------------------------------------------------------------------- > *Fra:* [email protected] > <[email protected]> p? vegne af Peter Gottlieb > <hpnpilot@...> > *Sendt:* 20. marts 2024 23:44 > *Til:* [email protected] > <[email protected]> > *Emne:* Re: [HP-Agilent-Keysight-equipment] 8562E adventures > Now that I got that Avantek YTO to operate properly in the unit, I would like to > once again see if I can find an outer case and handle for this thing. > > Due to insane international shipping costs I will want it to be in the USA. > > Anyone have any leads? > > Peter > > > > On 3/20/2024 11:23 AM, Peter Gottlieb via groups.io wrote: > > An update. > > > > The Avantek YTO requires a lot more current to tune to the required > > frequencies than the HP YTO it replaces.? I was running into trouble because I > > was actually measuring the 2nd harmonic, which explained why it showed weak on > > the bench 8566A.? I was seeing minus some odd dBm where I would expect the 1st > > LO output should be around +10 dBm.? This is why I was having difficulties. I > > needed to look lower in frequency than I thought for the strongest output. > > > > Tho get the Avantek to run at the needed frequencies required some circuit > > modifications. > > > > Bottom line, it required adding some extra resistors in parallel to the > > current sense resistors in the Q301 and Q302 circuits.? In each case, the two > > parallel 100 ohm resistors had to have added two each precision 76.8 ohm low > > TC resistors.? This moved the 50 ohm sense resistor to 21.72 ohms.? Once this > > was done, I was able to get the YTO tuning alignment completed successfully at > > 3.200 and 6.050 GHz per the manual. > > > > The Avantek main coil is 10 ohms while the HP coil was 39 ohms. To limit > > dissipation in the drive transistors and sense resistors, I added a 20 ohm 5 > > watt resistor in series with the main coil, at the YTO.? At the 305 mA > > required at 6.050 GHz, it dissipates 1.8 watts. The power dissipation in > > components is calculated to be within limits. > > > > The analyzer errors disappeared and I can work further on it. > > > > I did notice that the drive transistor for the YTF is running VERY hot.? I > > will need to look into that. > > > > Peter > > > > > > On 3/18/2024 6:33 PM, Peter Gottlieb via groups.io wrote: > >> So my adventures in restoring this instrument continue. > >> > >> The YTO I got from ebay had a definite intermittent short between one side of > >> the FM coil and the -5 volt pin. > >> > >> I cut it open and this was a manufacturing defect. > >> > >> The ebay seller sent me another unit, which is fine.? He didn't give me a > >> hard time at all, very honorable. > >> > >> So I mounted it in the instrument with the adapter plate I had made, hooked > >> up the -5 volt regulator and everything else, and tried the YTO adjustments. > >> > >> I could set the low to the 3.200 GHz but I couldn't get the high to go to > >> 6.010 GHz.? Not enough range in the adjustment pot.? In the circuit there are > >> R44 and R126, each 100 ohm 0.1% resistors, in parallel, in the current sense > >> part of the current source circuit. I found that an added 1K resistor in > >> parallel would give me enough range so I added a high quality 1% 1K resistor > >> there. > >> > >> I was then able to go back and forth on the low and high adjustments until > >> they were right. > >> > >> However, that resistor might not be the right value even though I could get > >> the adjustments to work, because I am getting an error 319, which is a > >> warning that the coarse YTO tune DAC is near its limit. > >> > >> I will have to look at the DAC output to see if this is for the lower or > >> upper limit and go from there. > >> > >> This is promising.? It looks like this substitute YTO might just end up > >> working out. > >> > >> Peter > >> > >> > >> > >> > >> > >> > > > > > > > > > > > > > > > > > > |
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Re: 11048C feed through termination data?
You can start with a DC R measurement. If they seem fairly precise at DC, that's a good sign that they were intended to be so there and beyond. The RF/HF is of course a different story, but good LF/DC is necessary before you even worry about going up. Most typical terminators that I've seen are around +/- 5%, so nothing special. if you see say, one percent or better, then maybe they're pretty good - at LF/DC at least.
You can check them at RF/HF too, if you have the right gear. The type/grade of connector is a big factor too - if you're talking about BNC only, it's not a big deal. Ed |
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Re: total newbie into GP-IB
Greetings Ruben,
The prices I have been paying on eBay for National Instrument PCI GPIB cards has ranged from $33.00 to $200. It all depends how patient you are and the form factor of the GPIB / GPIB+ adaptor. The "low profile" NI GPIB card I purchased for my primary controller was about $180, this also included the adapter cable to convert the connector on the card to a full size GPIB connector. I have seen GPIB PCIe adapters go for $300+, a bit more than I would be willing to pay for. Once I'm able to test the NI USB HS adapter (paid $86 for) I may post my results, until then I have no idea if it's a counterfeit. It is new in the box, comes from a seller with good feedback from the USA so we'll see.? I am a big fan of the KE5FX software suite, it does most everything I need to do, everything else is covered by HTBasic, NI IO Trace, NI GPIB Analyzer and or Python scrips. I've used the Phase noise program to plot phase noise measurements with my HP 70k series SA. Used Time lab with a HP 5371A and a HP 5370B to make Alen Deviation plots with ease. I make full use of the console based applications called talk, listen and query. You can piece together some creative batch files to preset instruments with these console based applications. Best Regards, Craig Petersen. |
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Re: Agilent 34401A DMM
Thanks. I tried the shift + power on method and it took about 15 seconds to run and it made lots of internal clicking noises and then it showed PASS.
The only niggle I have found so far with it is that there was a buzz/hum from the transformer. I took the cover off and one lug of the transformer was loose! It sounds a lot better now although there is still a very slight hum from the transformer if I hold my ear to the casing. It takes 8W when running and the transformer runs quite cool to the touch. So I don't think the transformer is faulty in any way. To try and verify this, there are another seven of them at work and I tried listening to all of them. They all give out a slight hum from the transformer when I listen close to the case. Some are slightly worse than others. I guess this is normal for this meter. They also vibrate/tremble ever so slightly when running and this is from the transformer. |
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Re: total newbie into GP-IB
On Thursday 21 March 2024 03:42:50 pm Roy J. Tellason, Sr. wrote:
So if anybody might want some, ?please feel free to contact me off-list at roy AT rtellasonn DOT com and we'll work something out.That should be roy AT rtellason DOT com... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin |
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Re: total newbie into GP-IB
On Thursday 21 March 2024 07:03:48 am tom_iphi via groups.io wrote:
Hi Joel,Looking that over, that's really pretty nifty! These are cheap enough to spend an individual adapter for every instrument.I looked over the docs that came with that, and saw mention of using "parallel printer cables" to make cables to use with this setup. I have a fairly large pile of those and no particular use for them. So if anybody might want some, please feel free to contact me off-list at roy AT rtellasonn DOT com and we'll work something out. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin |
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Re: AR488 GP-IB boards with bluetooth
On 3/21/24 11:21, tom_iphi via groups.io wrote:
Redirector.exeIs the source available? I'm wanting to stay linux/python based for this kind of thing. -- John Griessen |
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Re: AR488 GP-IB boards with bluetooth
On 3/21/24 11:21, tom_iphi via groups.io wrote:
no need to invent the wheel a second time.That's great! Who all wants to order boards? Radu? I'll be wanting 8. I'll probably kit the parts also, ordered with digikey's free shipping prepaid option, unless speed is required. This is back burner for me... -- John Griessen |
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Re: Agilent 34401A DMM
Download a copy of the user and the service manuals from Keysight¡¯s website. Lots of good info there, including the instructions for initiating the built in self test program, which will let you know if the unit is working properly.
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Re: AR488 GP-IB boards with bluetooth
Hi folks,
no need to invent the wheel a second time. I have uploaded several variants as KiCAD projects (KiCAD5!) and some additional information to this folder: /g/HP-Agilent-Keysight-equipment/files/AR488%20GPIB%20Adapter%20Info The zip package contains two programs: Redirector.exe This software can be used to redirect a device on interface A (NI VISA if installed, COM Port, TCP) to an interface B (another COM Port, TCP, Terminal, KE5FX GPIB Toolbox, Voice output...). Very useful, particularly when working with many COM ports as these can be filtered and Bluetooth names can be displayed. Porttest.exe Sends out random data to one COM Port and compares it to incoming data on another COM Port. I wrote this to test HC-05 Bluetooth modules. Recently, I bought a batch that wouldn't properly work at 115.2kBaud. It would drop data packets. Have fun! Tom DG8SAQ |
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Re: AR488 GP-IB boards with bluetooth
John, Heck, yeah! Count me in!! I'm a fan of KiCAD, so if all?things equal etc., I'd favor that option. Radu.? On Thu, Mar 21, 2024 at 9:29?AM John Griessen via <john=[email protected]> wrote: On 3/21/24 05:03, tom_iphi via wrote: |
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AR488 GP-IB boards with bluetooth
On 3/21/24 05:03, tom_iphi via groups.io wrote:
I'm using the homebrew Arduino AR488 adapters on all of my GPIB instruments.I'm familiar with KiCAD, pcb-rnd, gschem, sch-rnd tools and am thinking of making a pcb with: integral USB connector, arduino 32u4 and mega 2560, ieee-488 connector, bluetooth HC05. Anyone else interested? Does one already exist for sale? |
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Re: total newbie into GP-IB
On 3/21/24 05:03, tom_iphi via groups.io wrote:
Another advantage of Bluetooth is that every adapter can identify itself with the instrument name. Some of my instruments are so old that they do not understand *idn? yet.That sounds like the way to go!Do you fab these yourself, or buy pcbs, or? |
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Re: total newbie into GP-IB
Hey Ed,
I think NI added a check for counterfeit adapters in their 488.2 software from version 17.6 onwards - They stopped making earlier versions of the software available which was an annoyance for me as, at the time, I used an NI GPIB-ENET/100 which wasn't supported in 17.6+. However, you can still get earlier releases over on archive.org. TonyG |
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Re: total newbie into GP-IB
I have no experience with the knock-offs.
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In the past I have heard stories of such units working but having trouble with drive capability due to cheapening out on the GPIB bus drivers and giving trouble with setups with more than a couple of instruments on the bus or longer cables.? So they may work OK with an instrument or two. Peter On 3/21/2024 12:40 AM, RubenRubio wrote:
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Anders
Craig Petersen
RubenRubio
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