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Type of power divider 8
Hi all as I am after a bit of advice I want to compare power sensors up to 26 Ghz and there appear to be more than one Type of power divider available so looking for guidance to the one I should search for also looking for a magic T at 48 Ghz so either WR22 or WR19 as I missed one during my recent illness Regards Paul
Started by Paul Bicknell @ · Most recent @
Dymec 2460A/M3 plugin manual? 3
Any chance someone here has a PDF of the manual for these things? I've found some hard copies on eBay so that might be a last resort, but if I can avoid spending $50AUD just for curiosity that'd be nice I can't even remember when or where I picked this thing up (I suspect in a bulk lot at some point), it's been on the shelf for years but recently I finally found a power cable for it and gave it a test to find it does in fact work. There really doesn't seem to be much info out there about these things, but it looks pretty handy for a handful of tasks
Started by David Aurora @ · Most recent @
8566B Screen Issue 2
Hi all, My 8566B hasn't been switched on for about a year. I'd just replaced the perished rubber O rings in the main front-end attenuator and thought I'd check it out. I didn't get very far, unfortunately, because there's a screen fault. I've noticed vintage test equipment doesn't like being left unused for any length of time, so wasn't entirely surprised that something went wrong with it. The image on the CRT has shrunk, gone fuzzy and retreated to the bottom left hand corner of the screen (see attached photo). I vaguely recall this is not an uncommon fault with any CRT based display, but can't recall what the typical cause of it is. Can any kind soul please disabuse me of my ignorance and suggest what might have failed? Many thanks, Jinxie.
Started by Jinxie @ · Most recent @
8643A CLIP - Artekmanuals 5
Hi everybody. On May 17th, I ordered on the Artekmanuals website, and paid with Paypal 25$, the 8643A CLIP with electronic delivery but nothing was sent. So far, I emailed twice to the official email mentioned on the website and also to the email I had for Linda to explain the problem but, once again, no answer or even email receipt. Having no idea about what is going on and having bought many manuals from Dave with whom I had very nice exchanges, I feel uncomfortable to complain on Paypal for reimbursement, with also the side effect that I would still miss the 8643A CLIP. So I would prefer any of the other two possible soft solutions that come to my mind. The first one is that somebody on this list has this manual and could send me the file through wetransfer if I send him the proof that I paid Artekmanuals. This way I think that Artekmanuals and I are both happy and all is OK without more questions. The second one is that somebody has a direct contact with Linda and sorts out the situation if it is possible. Christian.
Started by santa0123456 @ · Most recent @
HP8756A - 8757A and the 11613B calibrator... 2
Hi Again! Just inspected my HP11613B calibrator and that box is just creating a very precise AC voltage with different amplitudes. The amplitude is selected by loading a 16 bit value via a proprietary serial protocol into two 4094 shift registers. To me it seems, that in case of the 8757A, the data is provided by the analiyzer via the detector-plug, whereas if used with the 8756A the data is sent in via the D-Sub9 plug. Power always is provided by the detector plug I guess. So my question: Is there a pin out of the detector connection for the 8757A scalar analyter? Of course a schematic of the whole instrument would be cool, too ;-) Thanks and have a great new week, Erik. ''~`` ( o o ) +------------------------.oooO--(_)--Oooo.---------------------------+ | Dr. Erik Baigar Inertial Navigation & | | Salzstrasse 1 .oooO Vintage Computer | | D87616 Marktoberdorf ( ) Oooo. Hobbyist / Physicist | | erik@... +----\ (----( )-----------------------------+ | www.baigar.de | \_) ) / +----------------------+ (_/
Started by Erik Baigar @ · Most recent @
HP8566B band amplitude response discrepancy - how much indicates a component failure? 9
I'm still looking at this 8566B I just repaired, and pondering what it takes to do more adjustment. Right now it looks like the 2-5.8 GHz band shows over 12.5 dB lower than in the low 0-2.5 GHz band. I'll probably start trying to tweak things to see what's needed to bring it up to par. This is the unit that had a shot YTO - the oscillator Q had B-C shorted, evidenced by the blown collector bias resistor in one of the "RO" spots. With the fresh YTO and the A20 adjustments done, the 0-2.5 GHz band seems to work fine, so I know the frequency controls and 1LO power are sufficient. I think the 13 dB or so less in the next band and whatever amounts in the higher ones should be easy to correct with proper adjustments, but I have never done this on any of my 8566s. I'm wondering whether this initial difference is no big deal in the scheme of things, or indicative of some other failure. From a quick look at the adjustment document it looks like it will get quite complicated and tedious, involving alignment of the YTX with the YTO and such, band by band. There's a lot going on in there. I think the main thing next is to assess the condition of the YTX. The only comparison I've done so far is in the overlap of the bands around 2.3 GHz. The low band is checked against the 100 MHz -10 dBm cal reference (which I checked with the 436A), then the response is checked at 2.3 GHz ~0 dBm from the HP70331A and then in the 2-5.8 band. The preselector peaking process seems to work through its routine, so the YTX must be doing some tuning at least. Anyway, I think it's likely OK and close enough operationally that it's mostly going to be about adjustments, and not some other component failure. I'll find out eventually, but it seems a lot more involved than I had expected. I'm hoping for a fairly low frustration and anxiety level. Should I worry? Ed
Started by ed breya @ · Most recent @
HP8757E GPIB issue 5
Hello group, I recently got a HP8757E (FW: 4.1) scalar analyzer that works well, fortunately, but I can not get the (general) GPIB bus working properly. The GPIB System bus works fine. I tried different GPIB adapters but the only command that works is: IP. I never saw any data send by the analyzer. Message on the screen: GPIB talk error. Do I miss something or do I just need a new GPIB card? Please advise, best regards, Harke
Started by Harke Smits @ · Most recent @
16903: Replace motherboard? 2
Fellow techies, I recently became the new owner of a 16903A logic analyzer. From what I've read, on EEVBlog, it's possible to upgrade the motherboard within a specific range (limited by which boards can still run Windows 7, as I understand it) for better performance. It's also my understanding the 16903 is nothing more than a 16902 with a smaller accessory card backplane. This being the case: Has anyone tried upgrading the motherboard in their own 16902 or 903? If so, I would appreciate some suggestions as to which board(s) would be a good choice. I'd also appreciate hearing about any 'gotchas' or quirks for the units, and how to go about enabling whatever options are useful. Thanks much. -- Bruce Lane, ARS KC7GR, kyrrin@... "Quando Omni Flunkus Moritati" (Red Green)
Started by Bruce Lane @ · Most recent @
Remote operation of Agilent 16702B from Windows 11 (Pro)
I'm sorry to be asking this question as I imagine it's been answered before but here goes. I'm trying to remote access my 16702B analyzer (Opt 3) from my windows laptop. The maddning thing is that I did this as recently as two years ago debugging a Battlezone arcade game. I was even able to get the 6502 disassembler to work correctly. Since that time I was in the hospital and induced into a coma. Coming out of that took over a year with brain fog and fine physical dexterity being issues. I thought I was able to make this work via Remote Desktop Connection but I don't see how as I don't think it supports X11. Although I can telnet to the analyzer and view the web page I can't get shares to work (minor issue) nor can I get X11 working. What is the best way to get this functionality going again? Thanks, Marc Howard
Started by Marc Howard @
16700A How to change baud rate when using boot menu via RS232? 4
When using the 16700A boot menu through the rear panel RS232 serial port, how do I increase the baud rate from its default 9600? I tried the command "PATH CON SERIAL_1.19200.8.none", and it acknowledged the 19200, but it still runs at 9600 even after rebooting. I want to dump some memory and capture it. Faster baud rate would help. I see two megabyte of interesting data beginning at memory address 0xF0000000. Could be the boot ROM. Maybe I can figure out how the "user defined" monitor resolution works and configure 1600x1200 at 60 Hz. Maybe. By the way, to switch the console back to VGA+PS2 keyboard, the command is "PATH CON GRAPHICS(0)". Beware the command "PATH CON SERIAL_2" switches the boot console to an *internal* RS232 serial port. I did that by mistake. That port's TxD and RxD signals are located on pins 5 and 3 of the SN75C185 transceiver chip located on the top side of the CPU board near connector J1. I clipped onto those two signals, and saw the boot menu, also at 9600 baud. I don't know where those RS232 signal go, perhaps to the emulation module (I don't have one).
Started by norbinz @ · Most recent @
HP-8640B ¨C Frequency Counter Issue in Normal Mode 2
Hello everyone, I'm experiencing an issue with the frequency counter on my HP-8640B signal generator. It no longer works in the normal counter mode (with the ¡Á10 and ¡Á100 buttons released), but it functions correctly in the expanded modes (with either the ¡Á10 or ¡Á100 button engaged). In those expanded modes, the unit locks to frequency without any problems. Has anyone encountered a similar issue or could suggest which part of the circuit might be at fault? Any help or guidance would be greatly appreciated. Thanks in advance! Marcelo F. Ruiz
Started by Marcelo Ruiz @ · Most recent @
(US only) - need power transformer from HP 8970A noise figure analyzer
The power transformer in my HP 8970A noise figure analyzer was DOA (internal short circuit). I'm using a patchwork of external DC supplies to operate it currently, however, I'm pretty sure that arrangement degrades measurement accuracy (noise entering the unit from the various power supplies and external wiring.) If you have a dead 8970A that could donate it's power transformer, please drop me a message. Much tks, Dave.
Started by David Feldman @
HP Basic reference manual
blast.. wrong key "I did buy a number of HP items from Patricia. It is all from an estate sale https://link.marktplaats.nl/m2273722281?utm_source=ios_social&utm_medium=social&utm_campaign=socialbuttons&utm_content=app_ios_table Wilko"
Started by Wilko Bulte @
HP
Maybe this is of use to anyone? I do not know the seller in person, but I did buy a
Started by Wilko Bulte @
HP8756A - cal data backup and recovery - FYI. 11
Hi to the HP-Enthusiasts, Dear Aaron! On the weekend Aaron approached me because of the work I have done to re-program my HP8756A scalar analyzer with fresh calibration data. My analyzer lost data quite quickly and that was because one of the caps developed a signigicant leakage current. So I replaced all of them and added a larger Li battery to the CPU board. For programming, I used (in the 2000s) a sun workstation and the sbus GPIB adapter which was in there, so that code is not of much use nowadays. But the procedure was as follows: Using a calibrated HF-voltmeter, I created a table of the output power of my 8350B generator for all attenuator steps. Than I connected the detector to the 8350B and made a measurement using the un- calibrated 8756A (with cleared calibration data). From that, I calculated correction polynomials for all three channels, (taking into account the frequency and the correction value printed on the detector head for the frequency I was running at). In a last step I wrote the polynomal into the 8756A and after that it gave the correct readings as measured with the HF-voltmeter. Attached is the C source file for your amusement (there you can see how the polynomial gets written). Should not be hard porting that to a modern platform. (1) USE AT YOUR OWN RISK (2) Would be happy if you mention my work ;-) Best wishes, Erik. www.baigar.de P.S. Of course a much better method would be analyzing the 8757 cal program (which does not work with the 8756A of course!)... https://www.keysight.com/us/en/lib/software-detail/instrument-firmware-software/11613b-windowsbased-calibration-software-files-sw485.html ...on how to drive the 11613B calibrator... https://www.keysight.com/us/en/support/11613B/calibrator-for-scalar-network-analyzer.html ...and with the knowledge from my c code creating a new, nice calibration software (preferrably for linux ;-)). Actually I have got one of the 11613Bs, but the project never has taken off... P.P.S. The only reason to bother with the 8756A is, that I have the equipment doe measurements up to 18G which is not the case for my VNWA. ----------------------------------------------------------------------- ''~`` ( o o ) +--------------------------.oooO--(_)--Oooo.-------------------------+ | Dr. Erik Baigar Inertial Navigation & | | Salzstrasse 1 .oooO Vintage Computer | | D87616 Marktoberdorf ( ) Oooo. Hobbyist / Physicist | | erik@... +------\ (----( )---------------------------+ | www.baigar.de | \_) ) / +----------------------+ (_/
Started by Erik Baigar @ · Most recent @
HP 8702D - What is the latest firmware? 4
Hello, I am searching for a few days for the 8702D firmware without any luck. I saw some CPU boards on eBay showing version 6.14 on the EEPROMs. Does anyone have the firmware files? Is the Lightwave Analyzer 8702D supporting version 7.x firmware? Thanks, Razvan
Started by Razvan Popescu @ · Most recent @
HP8510C "system bus address error", but then it works 5
Got my hands on a 50GHz 8510C with test set and source, everything mounted in a mobile rack with a pullout table. When I switch it on, it says "caution: system bus address error", but them it proceeds to function OK. Both the test set and source respond to commands. I have checked the addresses, and they are set as specified in the manual, both on the instruments and in the HP-IB setup menu. Not much of a problem, since I can use the analyzer, just a bit annoying. Any idea how to fix this? Marko Cebokli
Started by Marko Cebokli @ · Most recent @
HP Hewlett Packard 400E AC Voltmeter - Untested 5
HP Hewlett Packard 400E AC Voltmeter - Untested Just received a 400E AC Voltmeter from ebay I payed ?42 including post turns out to be the bye of the day wanted it to calibrate my real to real tape recorders as my B&K is not the correct rang for the job It arrived exceedingly well packed Powered it up meter was displaying 1/10 scale on all ranges for no input Then after 5 minutes 1 Khz hardly read but 100 Khz read much higher 20 times more Strange fault any way left it on for 20 minutes now reading correct on all ranges bingo without laying a screwdriver on it Paul
Started by Paul Bicknell @ · Most recent @
Agilent E8357A Network Analyzer Phase Lock Lost Error 17
I have been troubleshooting my Network Analyzer using the E8356A, E8357A , E8358A Service Guide June 2004. This 8357 has an upgraded 700 MHz CPU. After reading and Option 015. My problem is Phase Lock Lost error in a number of bands. All would seem to relate to the A8 Fractional-N Synthesizer Board Assembly. Fortunately I could partially run the Serial Bus Test where I found wildly out of spec voltages on the board. The Serial test node numbering on my application do not coincide with the manual Nodes but the description places me in similar territory as the Manuals Node descriptions. The test has a minimum and maximum range for the Node as I will describe. Min Result Max +5Vdc Supply Voltage 4.28. 5.0 5.78. OK Band ALC Level -8.27 14.0169 1.0 Bad VC01 Tune Voltage 6.3 -1.345 14.3 Bad VCO Compensation 2.07 13.748 4.07 Bad Node descriptions A11 Phase Lock Board. ( the signals to the A11 board 30kHz block come from the A8 Fractional-N board. 30kHz Phase Detector -0.33. -5.088 0.33. Bad 30kHz Phase Detector Integrator -2.86 -13.827 0.44. Bad 10MHz Frequency. 10.000000 5Mhz Frequency 4.999756 A10 Phase Lock Test Network Analyzer Setting W39 From A10J5 Band 0 Setting 9.9MHz Result should be 9.9MHz Actual Measurement 9.87 (Very weak signal) Band 1 - 6. Setting. 1 GHz Result should be 1.04166MHZ Actual Measurement 1.041616MHz A8 Fractional -N Band 0 Output Setting 5MHz. Result Should be 120.16 MHz. Actual Measurement No distinct signal I have added pics from CW Testing showing the frequencies and Bands affected. And the 20MHz - 550Mhz segment. My questions: 1. Would you agree with A8 Fractional board being bad? 2. Are there A8 Boards available in the < = 500 dollar range.
Started by Johnny10 @ · Most recent @
HP 8482B
Hi all, I have acquired the above sensor with the matching attenuator. It zeros but takes a couple of hours to stabilise. before I start digging to deep is this something that can be repaired easily? thanks tony
Started by Anthony Walker @
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