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Good morning Group, I recently purchased a 8557A that looks to be in good condition but I don't have a display so I haven't been able to check it out. Neither have I been able to find a service manual but I do have a manual for the 8558A which at least is similar. My Question is, there seems to be a missing lead from the compression fitting labled LO OUT located on the top surface about in the center of the unit. Can someone help me to determine where this lead terminates. A photo of the top view of the unit would be great if you could e-mail a copy to me. Also what is the connector at the top left rear from the front view. It looks like some sort of interlock or a contact point from within the cabinet. I have a HP 180d scope frame on the way. Will the 180d have the necessary options required for the basic operation of this unit? Anyone with experience with this unit could be a very big help to me and I would appreciate it very much George Headley Atlanta

I posted an album with photos that I hope will make my question clear. Please view and help me if you can. Any comments about this unit and general assistance with HP documentation would be welcome. I know the data is good in the HP manuals but it's like I have to learn to read all over again. Maybe I've studied too many Tektronix manuals.:) Thanks in advance for any help and comments. George Atlanta

Hello group, Trying to restore a 5245M counter , is there a downloadable service manual or schematics somewhere , 5245L would also do the job, for this one , and maybe some info regarding the 5254C plug-in . Many thanks, Erik Paret

hi all just got an HP547A current probe off Ebay for troubleshooting purposes; anyone knows of a downloadable op-manual? thanks Adriano

Dear Colleagues, I need some help and or tips on how to remove frozen Allen set-screws like the ones found on equipment knobs. The typical scenario happens when trying to remove a stubborn set screw. The Allen wrench "slips" and rounds the insertion pattern slightly. Has anyone heard of a slightly oversized set of Allen wrenches (on the order of .001" - .002") or is this the wrong approach? If they exist, who supplies them? Any comments and/or suggestions are welcome. Regards, Mike DiGirolamo, W4XN Charlottesville, VA 22901

400D transient response I’ve been repairing a 400D AC voltmeter that followed me home from a hamfest. I think I have it working, but I have lingering suspicion about the stability of the 4-tube “op-amp”. I don’t quite have the math anymore to do a pole-zero analysis with any confidence I’d get it right, so I’d like your wisdom and experience. If I put it on the 0.3V range and give it a 1.5V step, the Output terminal presents a damped sine wave. Initial amplitude is 0.5V (note: I’m a bit hazy on this) and frequency is about 4Hz. It damps out in about 6 cycles or 1.5 seconds. Refer to the schematic in the 400D manual, available for free at BAMA. The only low-frequency breakpoints I think are of interest are: 1. V3 cathode, (Zk + R122) * C105A. R122=2.7 ohms, C105=1500uF. I don’t remember how to calculate cathode impedance Zk so all I can say is that this one’s a pole at something much less than 40Hz. For anyone who’s got the data, the tube is a 6CB6 at about 10mA cathode current and about 120V on the screen. 2. V4 cathode, same thing. 3. V3-V4 coupling, C24 * (R36+R37). C24=2.7nF, R36=3.3M, R37=2.7M. This is a zero at around 10Hz. 4. V4-V5 coupling, C26 * (R46+R118). C26=20nF, R46=680k, R118=1M variable. This is a pole somewhere between 5Hz and 12Hz. R118 is the LF gain adjustment. It works counter intuitively: as you decrease R, yes the open-loop gain falls, but this is overshadowed by the increasingly leading phase which reduces the feedback. 5. V5 plate supply, C30B=20uF, R51=3300. This is a zero at 2.5Hz. 6. V5 output, R52=10k, C32/33=4uF. This is a pole at 3.5Hz. All the important resistors are in spec except the 2.7ohm ones in series with the cathode bypass caps (they’re about 30% high), but I figure they’re swamped by Zk. C105A has increased to 2000uF. None of the paper caps are leaky. All the DC voltages are near spec. Is it possible that C30B has increased, moving its zero too far away from the C32/33 pole? Or maybe the C105A pole is reinforcing the C32/33 pole? Comments? Insight? Clue? J Regards, Dave Wise

Hi, Has anyone managed to get the IAL Downloader included in the HP 165x logic analyser inverse-assembler kit to work? I've tried it on three different machines, and IALDOWN keeps dying with an "Integer divide by zero" error before downloading the IA to the analyser. Also, does anyone know of a source of grabber probes, pods and pod-to-analyser cables for the 1651B? Thanks. -- Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB, philpem@... | ViewFinder, 10BaseT Ethernet, 2-slice, http://www.philpem.dsl.pipex.com/ | 48xCD, ARCINv6c IDE, SCSI McBorgs - Over one billion assimilated!

Hi guys, I am currently looking for some HP8569B knobs. I understand the same knob is used on other units too. Frequency Span / Div and Resolution BW knobs Reference Level and Input ATT db knobs Please email me radiorick@mchsi,.com and let me know what and you have how many. Thanks Rick T

Hi guys, I am currently looking for two sets of REAR protective bars (rear feet) for the HP8920B. Please email me off list at radiorick@... Thank you, Rick T

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

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) -- http://www.PRC68.com http://www.pacificsites.com/~brooke/PRC68COM.shtml 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

Hello everyone, About 6 weeks ago I posted an enquiry for an HP5100B synthesiser driver to mate with a 5100 main unit. Unfortunately no-one replied. On reflection, who would want to part with just half of a 5100/5110 pair? So now that I have the 5100 part of the synth working well, even if only producing a few frequencies, I guess I'm hooked and want to own a complete set. so if anyone is wanting to dispose of a 5100 synthesiser AND a 5110 driver, I would love to hear from you.BTW the pair do not have to be fully operational, merely refurbishable. Thanks in anticipation! Rob Fincher VK3BRF Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com

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

Can someone tell me where to get the OPT-001 High Stability Reference oscillator for this generator?. Bruce.

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 -------------------------------

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 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.

Can anyone describe the exact differences (specs, features) between the 8566A and 8566B analyzers? I'm trying to determine the degree of GPIB software compatibility between the two. I've recently had my hands on an 8566B, but have no access to an 8566A for testing. Thanks! -- john KE5FX

Good afternoon list. I have an HP141T with the Hp 8553b and Hp 8552b plug ins. I am new to solid state test equipment and need some help. I have down loaded all the manuals from the BAMA list. The situation of my unit is it appears to work in all aspects except it does not have sufficient vertical gain. It will show its calibration signal in all modes 2db log, 10db log, and linear but, the display will not show the peaks at the levels that it should(7.1mv, -30db). The signals are abt 2/3 of what they should be on the 1uv and -60db scale. I have done the test indicated in the 8552b manual to test the final amp. I injected a 3mhz signal at pin 14 of card XA4 with that card pulled. The test indicated the amp was not working. Where do I go from here?? The down loaded Hp manual is not that easy to use or read. Another thing that I don't understand is why would all functions continue to work with a failed amp. One thing that may help someone who understands this unit is when I change the gain(db or mv) the entire trace will shift either up or down on the screen, sometimes out of the range of the vertical position control. This problem would be corrected by a balance control adjustment on an old tube type scope. Thanks for any help or comments Dave Faria WA5TEZ

I am still looking for a 10mhz reference oscillator for this sig. gen. HP Part# 08656 - 16195 I believe. Does anyone know who sells the options for older HP equipment? Bruce.