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Re: 8594E Cal Signal not Found ?
Hi Andrew, It's ok to have 2 or 4 EEPROMs for version G (94.03.15).? You can read about the various versions and EEPROM part numbers here (original doc
By Mark Litwack · #151225 ·
Re: 8594E Cal Signal not Found ?
Mark, my 8594E only has 2ea firmware chips U24 & U27, is this normal? Everything I seem to find about this unit says 4 chips? I was trying to see if I had the latest firmware installed.
By KB2LMN · #151224 ·
Fail over input board for the HP-5087A distribution amplifier
Recently saw a you tube video of an HP-5087A with an HP designed (I think) fail over amplifier board. I have never seen any documentation on the board before. The board takes a signal from two of the
By Ed (scskits) · #151223 ·
Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer
Anders, So, in green is the active bias stage, R66 serves as the current sense. In my case, I have 5.186V, which means that the collector current of Q13 is about 9.8mA. In blue is the
By Yves Tardif · #151222 ·
Re: 8594E Cal Signal not Found ?
Thanks Mark, ya I did all that but did just see this so I will try next. Instrument firmware expects the cal output signal to be 300 MHz ± 2 MHz.Sometimestheinstrument default data is not able to
By KB2LMN · #151221 ·
Re: 8594E Cal Signal not Found ?
The workaround for the "Cal Signal Not Found" error is covered in the Assembly Level Repair manual. If you had to reload all the correction constants, I would start with the "Analyzer Initialization"
By Mark Litwack · #151220 ·
8594E Cal Signal not Found ?
After replacing battery I entered the Time Base Correction, Frequency Response Correction & Step Attenuator Corrections. Now when I go to perform Cal Freq or Cal Amptd I’m getting a Cal Signal Not
By KB2LMN · #151219 ·
Re: HP 8594E new issue
Great, glad the sync reset worked! It makes me wonder, however, if the CRT parameters were corrupt in SRAM, then what else might be corrupt? ?I would take a quick pass through the calibration
By Mark Litwack · #151218 ·
Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer
Thanky you for the valuable information Yves! I have now checked a bit further and made sure the VTO_TUNE reached the A9 Third Converter assembly ok. My VTO_TUNE voltage varies between -0.43 (10 MHz
By Anders L??v · #151217 ·
Re: Manuals for an HP3456B DMM?
I picked up the meters today. They are model 3456A. Both work, but need some cleanup. The power switch on on unit sticks on and the front/rear terminal switch is dirty. A quick checkout shows both
By BobH · #151216 ·
Re: HP 8594E new issue
Reset worked Config, 6, 6, 3. Thank you!!!!
By KB2LMN · #151215 ·
Re: HP 8594E new issue
6.3Vdc
By KB2LMN · #151214 ·
Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer
Hi, I tested this with my 8591A. I used an external generator for the 10 MHz reference. I measured the 300 MHz signal returning to the A15 COUNTER LOCK module. This way, I tested the path
By Yves Tardif · #151213 ·
Re: HP 8594E new issue
Also, how is the voltage on your new battery? -mark
By Mark Litwack · #151212 ·
Re: HP 8594E new issue
Odd that D13 would now be off.? We'll assume the 68230 and related circuitry is ok for the moment. Along the same lines as what Yves suggested, you could also try resetting the CRT to DEFAULT
By Mark Litwack · #151211 ·
Re: HP 8594E new issue
Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what
By KB2LMN · #151210 ·
Re: RF Alignment Failure in Agilent CXA signal analyzer N9000A
Hi, Hardyhansendk. Thank you for your response, As you mentioned about W9 cal signals, When I tested there I'm getting 50Mhz with -60dB not -25dB, it would be helpful if you share info regarding that.
By ipother6@... · #151209 ·
Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer
After further digging into my Ref Unlock error message on the HP8591A Spectrum Analyzer I have found the following. The 600 MHz SAW oscillator on A9 Third Converter assembly seems to oscillate at only
By Anders L??v · #151208 ·
Re: HP 8594E new issue
Mark yes the display was normal.
By KB2LMN · #151207 ·
Re: HP 8594E new issue
All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table
By Mark Litwack · #151206 ·