Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Hewlett-Packard 3310A Function Generator and hot carrier diode or Schottky barri
D. Dufresne
Hewlett-Packard 3310A Function Generator, serial number 1151A0XXXX.
Report of repairs. A friend's generator had failed and during his attempts at repairs had broken a diode by accident. The manual specified the test point as being the diode's leads, the oscilloscope probe proved to stressful. Suspecting it was a tunnel diode, he stopped his repair attempts and asked me to locate some tunnel diodes. I had some time so I took the unit and the service manual off his hands. Investigations revealed that the diode, A1CR4, was not a tunnel diode but a hot carrier diode, HP part number 1901-0518. I replaced it with a 1N914 just for now. The original problem was A1Q12, A1Q19 and A1Q20, all three transistors where defective. The service manual troubleshooting aids and maintenance tips section is quite useful, section 5-172. I replaced A1Q12, a 1855-0081 transistor, field effect, 2N5245 made by Texas Instruments with a 2N5486 by Motorola. Replaced A1Q19, 1854-0019, the part bears only 4-019, transistor Si NPN, Motorola SS2188 with a 2SD668 by Hitachi, now Renesas, no heatsink. Replaced A1Q20, 1853-0034, the part bear only 3-034, transistor Si PNP, 2N3634 or Motorola SM3197, with a Renesas 2SB648A, no heatsink, but with the original ferrite bead on the base lead. Redid the Triangle Amplifier Bias Adjustment, section 5-126. The generator now works, but on the two highest frequency ranges, 10 k and 100 k, the waveform is not within specifications. The duty cycle is not close to 50 % for the square wave. I tried a Schottky diode for A1CR4, same results. I tried to locate a Schottky hot carried diode and found 1N5711. It now bears the description Schottky barrier diode but is the same as a hot carrier Schottky diode. It looks as a Schottky diode but with very little zero bias capacitance, about 1 to 2 picofarad. A regular type 1 A Schottky diode has 100 to 1000 times that much more capacitance. My friend bought some 1N5711 diodes and sent them to me. Placed the 1N5711 in the unit. All within specifications, no need to calibrate. Daniel from Ville Saint-Laurent, QC, Canada. |
|
Hewlett-Packard 141T, 8552B and 8556A
D. Dufresne
Hewlett-Packard 141T Display Section, serial number 1615A148XX, 8552B
Spectrum Analyser IF Section, serial number 1505A095XX and 8556A Spectrum Analyser LF Section, serial number 1907A046XX. Report of repairs. This spectrum analyser system failed at turn on, after the unit had been left unused for a few months. Investigation revealed that on the 8552B the two fuses on the back panel, F1 and F2, where blown. I checked to see that there where no short circuit and installed new fuses. The unit ran for 15 to 20 seconds and then blew both fuses again. Looking at the schematic, the only way for both fuses to blow at the same time is if the overvoltage crowbar circuit is activated. To verify this I removed CR10, the crowbar thyristor, from the A5 assembly. Turned on the unit and it worked OK for a minute or so, then some other type of symptoms appeared. The trace is way off at the top, I can see some light but not the beam it self. Checking the power supply I found all the supplies high by about 30 %. The +100 V was 129 V, the -100 V was -128 V, the 248 V was 320 V, -12.6 V was -16.3 V. I turned off the unit after about 20 seconds. I removed the plug-ins and checked the supply, all four where within limits. Put back the plug-ins, the same problem is now back. I disconnected the 100 V going to the plug ins, all the supply voltages where OK. Checked the +100 V regulator, as it is the master and the three others take their reference from it. With 100 V output, the base to emitter voltage is 0.53 V on Q2, the pass transistor. With 129 V output, the pass transistor base to emitter voltage was -2.9 V. So the regulator circuit was sending the right signal to lower the output. This led me to suspect the plugins, maybe a current path from the 248 V supply to the 100 V supply. Further inspection revealed nothing wrong with the plugins. Back to the 141T supply I measured the current into Q2, the pass transistor with 128 V at the emitter and -3 V between the base and emitter, it should be cutoff, not so, the current was 407 mA! Replaced Q2, a 1854-0294, listed as Q, Si, npn Motorola SJ-1318 with a On Semiconductor MJ15003, silicone, TO-3, NPN, 140 V 20 A 250 W, overkill but I had it on hand. Any 140 V 1 A 75 W TO-3 NPN device would do, maybe a MOSFET also. Everything was back to normal. Reinstalled A5CR10 in the 8552B, all OK. System fully functional. I noticed some PWB discolouration under A5R3, a 4.7 k 5 % 2 W resistor, that dissipates about 1.3 W. I changed it to a 5W resistor and spaced it as far away from the PWB, so the increased surface area and longer leads will give a lower PWB temperature and longer unit life. Daniel from Ville Saint-Laurent, QC, Canada. |
|
Re: Wanted Manual: HP 3406A
guy royet
toggle quoted message
Show quoted text
|
|
Re: HP-8657A SIGNAL GENERATOR
开云体育Hello?Bruce ,
?
In Europe and the guy will probably ship to?
other continents :
info@...??
(website :
)
?
Good luck,
|
|
Re: Need adaptors for 8405A probes
jocjo_john
Yes, you are correct that the kit has everything needed. Note that
HP also had BNC adaptors 11570A. One undesirable aspect with this kit is the fact that HP said (in App Note 77-3) that the power splitter method is recommended only for frequencies below about 100 mHz. Above that, they recommend using the 778D dual directional coupler. However, if the kit remains available at near the current price, I would be inclined to purchase it and try the Narda coupler I have on hand with it. I'd guess the kit probably originally cost about $400-$500. Regards, John --- In hp_agilent_equipment@..., Rasputin Novgorod <priapulus@y...> wrote: --- jocjo_john <jocjo@m...> wrote:Thanks, Rasputin.That kit has everything needed for making vector |
|
Re: HP5100/5110 Synthesiser set
Robert Middleton
开云体育Hello Thomas.
?
Thanks for the tip, and I apologize to you for not
communicating with you sooner. I live here in the USA. Also, drop me an e-mail
from time to time when you and your associates are looking for HP manuals and
also HP gear as I do run accross alot of it.
?
Thanks for your time and have a great
day.
?
Respectfully, Robert
?
?
|
|
Wanted Manual: HP 3406A
Hi Gang,
? I'm in need of an HP-3406 "Broadband Sampling Voltmeter" Operator/Service Calibration and Instruction Manual. ?? Anyone out there have one they'd care to sell?? Anyone know of any downloads?? BAMA has nothing on this one that I can find. Thanks, Mike DiGirolamo, W4XN Charlottesville, VA 22901 ------------------------------- |
|
Re: Need adaptors for 8405A probes
Rasputin Novgorod
--- jocjo_john <jocjo@...> wrote:
Thanks, Rasputin.That kit has everything needed for making vector measurements (the whole point of having a vector voltmeter..)Such gear always has "N" connectors so to handle the highest frequencies. Cheap adaptors are easily available to change to BNC. Anyone like to hazard a guess of the original cost of that kit? There is a different kit made up of an assortment of probe end adaptors. Sincerely __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. |
|
Re: Need adaptors for 8405A probes
jocjo_john
Thanks, Rasputin.
The price is right (with the possible exception of shipping costs to the US), but I need adaptors for BNC as I am not currently set up for type N connections. Thanks again for pointing it out. John --- In hp_agilent_equipment@..., Rasputin Novgorod <priapulus@y...> wrote: As for continuing to look for the adaptor, I haveTry: eBay Item number: 3829178511 |
|
Re: Need adaptors for 8405A probes
Rasputin Novgorod
As for continuing to look for the adaptor, I haveTry: eBay Item number: 3829178511 __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! |
|
Re: Need adaptors for 8405A probes
jocjo_john
Hi, Arthur -
I forgot to mention that I am a klutz when it comes to mechanical things and I am not very imaginative. This sort of thing may be easy for you, but it presents a challenge to me. I looked at this approach for quite a while. I can't figure out how to make the probe tip get a good connection to the BNC T connector as the connector has a bigger hole than the probe tip diameter. Also, the barrell of the probe does not go inside the BNC connector even when the probe tip is completely inserted into the BNC hole. Would it help if I upload a photo and dimensional drawing? As for continuing to look for the adaptor, I have had a "saved search" for these on Ebay for over a month and no hits. I would have thought something would have shown up by now. But maybe not. Thanks for your help. John --- In hp_agilent_equipment@..., Arthur Shulman <dentist@n...> wrote: Use a BNC 'T' as the tap in a 50 ohm transmission line. Use a smalltake up the slack between the probe barrel & the inner diameter ofthe 'T'. the finger stock may be left in place in the 'T' after trimming. thefingers will retain it.much less than $150!with a directionaltiny pointy point coming out. The pointy point is about .03 in #11064A. Icoupler or into a transmission line. That would require a way of --found the BNC adaptor for sale for $150. But that's about what IADVERTISEMENT Yahoo! Groups Links |
|
Re: Need adaptors for 8405A probes
Arthur Shulman
Use a BNC 'T' as the tap in a 50 ohm transmission line. Use a small cut-off
piece of suitably small phosphor-bronze finger stock to take up the slack
between the probe barrel & the inner diameter of the 'T'. the finger
stock may be left in place in the 'T' after trimming. the fingers will
retain it.
toggle quoted message
Show quoted text
Keep lookiing for an adapter if you wish. They can be found for much less than $150! Arthur Shulman ? jocjo_john wrote: ?I've got an 8405A Vector Voltmeter. The probes have a barrell with a |
|
Need adaptors for 8405A probes
jocjo_john
I've got an 8405A Vector Voltmeter. The probes have a barrell with a
tiny pointy point coming out. The pointy point is about .03 in diameter and the barrell is about .288 diameter. It would be nice to be able to connect these probes to a directional coupler or into a transmission line. That would require a way of converting the probe to a BNC connector. Aha! I see that HP had a BNC adaptor #10218A for that purpose. They also had a kit #11064A. I found the BNC adaptor for sale for $150. But that's about what I paid for the whole instrument! What do others do to be able to connect these probes to real circuits? Thanks for any suggestions. John |
|
Re: Rules, What Rules? was: Manual copyright
Hi Stefan:
The Tek mailing list has had a number of posts on this subject, but I think the big picture is that a patent or copyright gives the holder the right to sue a violator for damages. Damages being defined as lost revenue and/or punitive. So as a practical matter what company is going to spend their valuable corporate attorney fees on a case where they can not even recover their expenses? I don't think it's a case where an individual has copied one manual. But if someone setup a business based on copying all of a companies manuals and underselling that company, then you might expect to be spending some time in court. Just my 2???, Brooke Clarke, N6GCE (no legal training, just common cents) -- Date: Thu, 22 Jul 2004 11:48:32 -0000 From: "Stefan Heinzmann" <stefan_heinzmann@...> Subject: Manual copyright Hi all, I have scanned the manual of the HP339A and made a PDF file. I would like to upload it to BAMA if that's ok. The manual is of course copyrighted by HP (1984), but the instrument is discontinued, and as far as I know the manual isn't sold by HP anymore. Tektronix allow putting up the manual for download in such a case, but I don't know about HP/Agilent. Does anyone know the rules? Cheers Stefan |
|
Manual copyright
Hi all,
I have scanned the manual of the HP339A and made a PDF file. I would like to upload it to BAMA if that's ok. The manual is of course copyrighted by HP (1984), but the instrument is discontinued, and as far as I know the manual isn't sold by HP anymore. Tektronix allow putting up the manual for download in such a case, but I don't know about HP/Agilent. Does anyone know the rules? Cheers Stefan |
|
Re: HP 8566A / B differences
John Miles
开云体育Further to this, I just spent some time comparing a
8566A catalog excerpt (presumably from sometime before 1984, when the 8566B came
out) to the specs for the 8566B as of 1996.? The RF specs I looked at
are?100% identical.? These include:
?
-
Frequency and amplitude range
-
Residual FM
-
Drift
-
Noise sidebands
-
Scale fidelity
-
Calibration uncertainty
-
Frequency response uncertainty (flatness), both bandwise and
cumulative
-
Third-order IMD (given as TOI)
-
Second-harmonic distortion
-
Image, LO-harmonic, and out-of-band responses
-
Displayed average noise level
?
Not
compared due to missing specs from 1996 catalog:
?
- LO
emission (no reason to think this is any different)
?
So it
appears that the only differences between the 8566A and 8566B are related to
GPIB control/programmability differences.? Although both analyzers can
store and recall 6 setup configurations, the 8566A catalog listing makes no
reference to the 8566B's 16K of user RAM for stored programs and trace
data.? So that may be the only real difference between the two.... a
difference that would matter to very few users in the Amateur/hobbyist
market.?? Automated test programs usually run on a separate GPIB host,
so unless I'm overlooking something, it doesn't matter if the analyzer can
execute programs by itself.
?
Certainly there appears to be no reason for the
prejudice implied by some sellers when they refer to their 8566Bs as "true B"
units, as opposed to those upgraded from the -A model.? From all I can
tell, an upgraded 8566A would be indistinguishable from the
8566B.
?
--
john KE5FX
? -----Original Message-----
From: John Miles [mailto:jmiles@...] Sent: Tuesday, July 20, 2004 11:35 PM To: hp_agilent_equipment@... Subject: RE: [hp_agilent_equipment] HP 8566A / B differences
|
|
Re: HP 8566A / B differences
Hi John:
toggle quoted message
Show quoted text
The 8566 is one of the best spectrum analyzers of the old style I've used. For some info about a system I designed and built with an 8566B see: The disks that came with the 8566 are in a non PC format (the PC was to be introductd years later). They can be read and copied using HP Rocky Mountain Basic workstations that are 68000 based, or maybe by one of the PC clone HP Basic programs, see: Computer languages for instrument control HP-IB Controllers The newer SAs use DSP instead of physical IF filters and can achieve a tremendous improvement in sweep time for a given RBW as well as offering much narrower IF bandwidth. For more see: - HP/Aglient 4395A combination Network, Spectrum & Impedance analyzer. Have Fun, Brooke Clarke, N6GCE -- Date: Tue, 20 Jul 2004 17:20:03 -0700 |
|
Re: HP 8566A / B differences
John Miles
开云体育Hi,
Mike --
?
I only
had the chance to spend a few days with the 8566B, but I was definitely
impressed.? It is about 12 dB 'hotter' at 10 GHz than the Tek 494AP I
normally use, and the 1-3-10?resolution bandwidth scales have a real
usability advantage over?the Tek's decade steps.? The display quality
is also light-years ahead of Tek, in that they implemented a serious
high-resolution?graphics display instead of using a
warmed-over?oscilloscope?interface.? On the other hand, the Tek's
control panel is a bit?nicer to use due to its 3-knob design, and its
signal-counter feature has come in handy many times.? I ended up keeping
the Tek over the 8566B for those reasons, and because I'm just more familiar
with it and have limited space in my equipment rack.? It was a close call;
the 8566B is one hell of a nice?piece of gear and I imagine the -A model is
no different in that respect.
?
I did
have a chance to add 8566B support to my GPIB plotter emulator app, and one way
you (and other HP analyzer owners) could help is by seeing if it works on your
8566A as well.? This is at
-- the easy way to test it is to unzip the files and run "7470 18" to see if it
can grab a plot from the analyzer at GPIB address 18, or wherever you've
configured it.? This *should* work on an 8566A or an 8568, but again,
nobody has tried it yet.
?
My
understanding is that the 8566B used a 68000 CPU (pretty exotic stuff in those
days; they were right there on the leading edge along with Apple's early Lisa
and Mac machines), while the 8566A used a different, more proprietary
controller.? But I don't know if that translated into any real
functionality differences, or if the RF performance is any difference.? I
don't know if the CRT is any different, or even if my 85662A display section had
a "new"-style CRT or not.? This was the first one I've
seen.
?
A GPIB
programming manual for the 8566A would be handy, if you have that in .PDF
format.? It would tell me a lot about what differences there are between
the two models.? Agilent's site lets you download
the 8566B manual, but not the 8566A manual, as far as I can tell.?
?
--
john KE5FX
|
|
Re: HP 8566A / B differences
Dear John,
toggle quoted message
Show quoted text
? I was particularly interested in this question since I've been shopping for an HP 8566B for some time now.? I came to the conclusion that I simply cannot justify the expense of this fine spectrum analyzer for my non-profit ham and experimentation? use.? I did however, find an excellent buy on an HP 8566A which I just received yesterday.? It is was certified with a NIST cal prior to sending, so I have reason to believe it to be in fine working condition. ?? I had accumulated manuals for the HP 8566B, and verification software on both 3.5" and? 5.5" floppies? (if you have the HP computer interface to use them - I can copy the 3.5" for you).? I've been working through the "getting familiar with.." sections of the manual for my "new" unit and am totally amazed with the ease of use of this fine piece of intstumentation. ??? Now, coming around to MY interest is your question.. I'd like to know what, if any, differences are there between these two machines besides some expanded HP-IB commands?? I know that around 1984 or so there was a newer CRT used in both units (was there was there a production overlap?) and I know that there was an A => B Mod Kit that included a new board which replaced an older board that had to be removed.? Other than that it appears that the basic machine functions and specs was the same.? Are you able to comment on this? ?? Is there any way I can help you?? I know NOTHING about HP-IB other than a little I've read. 73, Mike DiGirolamo, W4XN Charlottesville, VA 22901 ------------------------------- At 08:20 PM 07/20/2004, you wrote: ? |
Mike D.
to navigate to use esc to dismiss