Re: Help figuring out my 8648C Signal Generator?....
I'll have to wait until I reassemble the instrument to try...
I'm currently dealing with a fresh-popped Rifa capacitor (the first Rifa that popped on my bench! So exciting, and stinky... :D ) and a few other repairs here and there.
Shouldn't take much longer than Mouser takes to deliver a couple parts.
If anyone happens to have a scanned copy of the earlier service manual they can upload, or can scan their paper copy, that might reveal some info. Manual part number 08648-90001
Thanks,
Jared
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Hi Drew,
I'm curious about the PS fix. Was it the 470k "start up" resistor? I've fixed a couple of these by replacing that. (they were open)
Mark
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I picked up a non functioning HP 8920B and I¡¯ve been hard at it. It had a no power on issue that I resolved by repairing the power supply, NOT FUN! Next is installing a new LED monitor that I already have as the old one is hardly readable it¡¯s so dim but
all voltages check out so CRT is a dead duck.?
I have the following
Firmware V4.00 M01 ? Checksum 08111C36
Options
1. Tracking Generator
2. Cable Fault
3. Graphics Printout ( will never use )
4. Enhanced Spectrum Analyzer/ Markers
5. Full Test Setups?
My questions is, is V4.00 M01 the latest firmware??
Drew
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I picked up a non functioning HP 8920B and I¡¯ve been hard at it. It had a no power on issue that I resolved by repairing the power supply, NOT FUN! Next is installing a new LED monitor that I already have as the old one is hardly readable it¡¯s so dim but all voltages check out so CRT is a dead duck.?
I have the following
Firmware V4.00 M01 ? Checksum 08111C36
Options
1. Tracking Generator
2. Cable Fault
3. Graphics Printout ( will never use )
4. Enhanced Spectrum Analyzer/ Markers
5. Full Test Setups?
My questions is, is V4.00 M01 the latest firmware??
Drew
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Re: Sony Model CHM-7501-00
Thanks for the info. I have a 8510c and a 70004 that can use new graphics Mike?
On Wed, Nov 29, 2023 at 1:31?PM Michael Perkins via <terman08= [email protected]> wrote: Does anyone know of a lcd replacement for this monitor? Mike On Wed, Nov 29, 2023 at 11:03?AM peter bunge < bunge.pjp@...> wrote: Can anyone tell me what instrument a?Sony Model CHM-7501-00 video monitor came from?
I found one in my storage. It might have been from a colour LCD upgrade but the only thing I can think of is an 8753B or an 8566A but I'm pretty sure it was not from them.
It looks similar to the one from an 8753, but is not, and has a 20 pin ribbon cable at the back.
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Re: Sony Model CHM-7501-00
have LCD replacements. Find your instrument for the model to order. I highly recommend it,?and so do?many?others.
On Wed, Nov 29, 2023 at 4:31?PM Michael Perkins < terman08@...> wrote: Does anyone know of a lcd replacement for this monitor? Mike On Wed, Nov 29, 2023 at 11:03?AM peter bunge < bunge.pjp@...> wrote: Can anyone tell me what instrument a?Sony Model CHM-7501-00 video monitor came from?
I found one in my storage. It might have been from a colour LCD upgrade but the only thing I can think of is an 8753B or an 8566A but I'm pretty sure it was not from them.
It looks similar to the one from an 8753, but is not, and has a 20 pin ribbon cable at the back.
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Re: Sony Model CHM-7501-00
Does anyone know of a lcd replacement for this monitor? Mike
On Wed, Nov 29, 2023 at 11:03?AM peter bunge < bunge.pjp@...> wrote: Can anyone tell me what instrument a?Sony Model CHM-7501-00 video monitor came from?
I found one in my storage. It might have been from a colour LCD upgrade but the only thing I can think of is an 8753B or an 8566A but I'm pretty sure it was not from them.
It looks similar to the one from an 8753, but is not, and has a 20 pin ribbon cable at the back.
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I have scoured high and low for this and thought I would ask here as well.
I have a 4395A that is barely out of tolerance on attenuation. Repeat tests confirms the failure and it is adjustment is the way forward from here.
This particular unit uses a part number 04395-18004 that runs with VEE (V.5 I presume) to make the adjustments. Would anyone here by any chance happen to have a copy of this adjustment?
All the best, Mike
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Re: Sony Model CHM-7501-00
Hi,
I have one of these in a HP 4155A Semiconductor Parameter Analyser
The information I have is the following:
Sony
?? ?Model No. CHM-7501-00
?? ?HP P/N 2090-0210? 1996.15
?? ?65V DC 0.5A
???
This 2090-0210 tube is found in
?? ???? 8757C; 8757D - Vector Network Analyzer
?? ???? 8720B; 8720C - Vector Network Analyzer
?? ???? 8722B; 8722C - Vector Network Analyzer
?? ???? 8753C, 8753D - Vector Network Analyzer
?? ???? 4155A, 4156A - Semiconductor Parameter Analyser
?? ???? 8510C - Vector Network Analyzer
?? ???? 4396A - Spectrum analyzer
?? ???? 4291A - RF impedance analyser
?? ???? 8546A - EMI receiver
?? ???? 8751A; 8752A - Network Analyzer
?? ???? 8702B; 8703A; 8702D - Lightwave component analyzer
?? ???? 8757E - Scalar Network Analyzer
?? ???? 8752C - Network Analyzer
?? ???? 89441A - Vector Network Analyzer
?? ???? 70004A - Display; for use with 70820A Microwave Transition Analyzer
Have fun,
SwAkE
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Re: Sony Model CHM-7501-00
ThanksCaesar, I found some notes where you helped me set up the colour on it in an 8757D. I replaced it with an LCD. I guess I will give it to the guy who bought my 8757D. It was a nice machine. Peter
On Wed, Nov 29, 2023 at 2:27?PM Caesar Valenti < caesarv@...> wrote: I think the first products were the 8757C/E since I was the support engineer at the time.? Even though the E model was monochrome, it still used the color display...just using the green gun.? It then migrated to many other products.? Most all of the HP instruments back then that had a color display used this Sony display before LCD's took over.
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Re: Help figuring out my 8648C Signal Generator?....
I only have a guess, but the one output-related option I'm aware of is for higher power (20dBm, if memory serves). Perhaps that's what "MOD AY" is. Try setting the output power to around that value and see if the instrument accepts it.
--Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
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On 11/29/2023 6:44 AM, Jared Cabot via groups.io wrote: A4: 'OPT REFERENCE' P/N: 08647-61046 ->?Described in Keysight Parts Finder as 'Replaced by 08648-60042', which is 'MOD Assembly REF - 1E5' so I guess I scored the option 1E5, high stability time base.
A5: 'SIG GEN SYNTH' P/N: 08647-61050 -> Described in Keysight Parts Finder as as 'RF Synthe Assembly For 8648B' (I assume the B designation isn't exclusive to the B model as there are many parts shared between B, C, and D models?)
A6: 'RF OUTPUT' P/N: 08648-60116 -> Described in Keysight Parts Finder as as 'MOD AY-OUTPUT'.
Also, does anyone know what 'Mod AY' is?
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Re: Sony Model CHM-7501-00
I think the first products were the 8757C/E since I was the support engineer at the time.? Even though the E model was monochrome, it still used the color display...just using the green gun.? It then migrated to many other products.? Most all of the HP instruments back then that had a color display used this Sony display before LCD's took over.
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Can anyone tell me what instrument a?Sony Model CHM-7501-00 video monitor came from? I found one in my storage. It might have been from a colour LCD upgrade but the only thing I can think of is an 8753B or an 8566A but I'm pretty sure it was not from them. It looks similar to the one from an 8753, but is not, and has a 20 pin ribbon cable at the back. 
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Scott, can you suggest something?
"If speed is really an issue, you may need to upgrade to a newer instrument that will be orders of magnitude faster than the 8753.??There are really quick instruments that could probably address your issue for something in the 3-10K usd range"
are you talking HP or something else?
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Thanks Yves, I have forwarded this to Ron and will get back to you. Peter
Hi Peter, ? I did a test on my 8753ES (integrated Sparameter): ? I made a small PCB with just an LC resonator. ? I put the VNA in single sweep mode, the marker in width mode. ? In a loop to take 6 readings. In a 1kHz bandwidth, I get 6 peak in 1.6sec. In a 3kHz bandwidth, I get 6 peak in 0.8sec. ? The loop contains the following commands: ? *OPC?;SING I'm waiting for the sweep to be completed. After I send the following command: OUTPMWID to read the data. This command searches for the peak and returns the data. The data returned is bw, frequency and Q factor. ? I don't know the resBW you used in your test, but you have 2 results here for 1kHz and 3kHz bandwidth for comparison. ? I can redo the test, if you specify the bandwidth, to do a best comparison. ? -Yves ? ? Will an HP8753ES with the built in S-parameter test set slow down calculations compared to using an HP8753ES with opt 011 and the Transmission/Reflection test set (HP85044A)?
Our present analyzer is an HP8753ES - 011 --- It does not have a?built-in or attached S parameter test set - it only uses a Transmission/Reflection test set ( HP 85044A).
We measure the properties of resonances in our cavity, up to 3 GHz,in?the "thru" mode ( i.e. transmission mode) - We need the peak frequency?and the coupled Q of each resonance.
Our unit displays them on the screen when we select the correct display?mode.
More importantly, we use a Labview-based program and GPIB commands to?interrogate the Network Analyzer and have the pairs of peak frequency?and Q numbers for each resonance sent to our control computer.?In doing this, speed is very important to us. Our present system can?measure the f and Q of 6 peaks in 3 seconds.
I have a few question relating to what performance we might expect if we?used an HP8753ES with a built-in S-parameter test set: - Can the peak frequency and Q be accessed via GPIB commands in this S?parameter test-set configuration ?? We have no interest in the S?parameters as such - just the peak frequency and Q .
- If this can be done, will the GPIB commands be different from the ones?we use now with our system ? We don't want to modify the software or have two versions to deal with.
- If all this is a go - will the speed of acquisition be decreased compared?with our present system ?? Will the S-parameter "system" slow things?down in any way ?
Note that the same system using an HP8753C is considerably slower than using an HP8753B which is slower than the HP8753ES.?
Thanks for suggestions or help !
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Hi Peter, ? I did a test on my 8753ES (integrated Sparameter): ? I made a small PCB with just an LC resonator. ? I put the VNA in single sweep mode, the marker in width mode. ? In a loop to take 6 readings. In a 1kHz bandwidth, I get 6 peak in 1.6sec. In a 3kHz bandwidth, I get 6 peak in 0.8sec. ? The loop contains the following commands: ? *OPC?;SING I'm waiting for the sweep to be completed. After I send the following command: OUTPMWID to read the data. This command searches for the peak and returns the data. The data returned is bw, frequency and Q factor. ? I don't know the resBW you used in your test, but you have 2 results here for 1kHz and 3kHz bandwidth for comparison. ? I can redo the test, if you specify the bandwidth, to do a best comparison. ? -Yves ? ? Will an HP8753ES with the built in S-parameter test set slow down calculations compared to using an HP8753ES with opt 011 and the Transmission/Reflection test set (HP85044A)?
Our present analyzer is an HP8753ES - 011 --- It does not have a?built-in or attached S parameter test set - it only uses a Transmission/Reflection test set ( HP 85044A).
We measure the properties of resonances in our cavity, up to 3 GHz,in?the "thru" mode ( i.e. transmission mode) - We need the peak frequency?and the coupled Q of each resonance.
Our unit displays them on the screen when we select the correct display?mode.
More importantly, we use a Labview-based program and GPIB commands to?interrogate the Network Analyzer and have the pairs of peak frequency?and Q numbers for each resonance sent to our control computer.?In doing this, speed is very important to us. Our present system can?measure the f and Q of 6 peaks in 3 seconds.
I have a few question relating to what performance we might expect if we?used an HP8753ES with a built-in S-parameter test set: - Can the peak frequency and Q be accessed via GPIB commands in this S?parameter test-set configuration ?? We have no interest in the S?parameters as such - just the peak frequency and Q .
- If this can be done, will the GPIB commands be different from the ones?we use now with our system ? We don't want to modify the software or have two versions to deal with.
- If all this is a go - will the speed of acquisition be decreased compared?with our present system ?? Will the S-parameter "system" slow things?down in any way ?
Note that the same system using an HP8753C is considerably slower than using an HP8753B which is slower than the HP8753ES.?
Thanks for suggestions or help !
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Help figuring out my 8648C Signal Generator?....
Hi all,
I recently picked up a HP 8648C Sig Gen and am trying to figure out exactly what it is...
It had the serial and option stickers removed (A semi-common thing here in Japan when companies liquidate old gear, because reasons) so I'm trying to figure out just what this unit is fitted out with.
Luckily the instrument stores the serial number in its memory, so I was able to use GPIB to read it out: 3426A00711
The three plug-in modules inside are a little strange when checking their part numbers... The part numbers don't seem to exist in the service manuals I have found, but they do exist when checking the Keysight Parts Finder website.
Details as follows:
A4: 'OPT REFERENCE' P/N: 08647-61046 ->?Described in Keysight Parts Finder as 'Replaced by 08648-60042', which is 'MOD Assembly REF - 1E5' so I guess I scored the option 1E5, high stability time base.
A5: 'SIG GEN SYNTH' P/N: 08647-61050 -> Described in Keysight Parts Finder as as 'RF Synthe Assembly For 8648B' (I assume the B designation isn't exclusive to the B model as there are many parts shared between B, C, and D models?)
A6: 'RF OUTPUT' P/N: 08648-60116 -> Described in Keysight Parts Finder as as 'MOD AY-OUTPUT'.
Does anyone know why these part numbers are different to the manuals (Both Agilent and HP branded manuals)? Maybe I have an older unit and they are just older part numbers?
Also, does anyone know what 'Mod AY' is?
Thanks!
Jared
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One of the primary differences between the different HP8753 models is the processor speed.? Newer = faster processor.? There are minor differences (like the addition of the disk drive on D and the LCD monitor from E onwards) as well.
I don't know the details regarding the speed issues, but things that affect speed include the number of measurement points and the IF bandwidth.? If you haven't already optomized these for your configuration you should adjust these for maximum throughput.
If speed is really an issue, you may need to upgrade to a newer instrument that will be orders of magnitude faster than the 8753.? There are really quick instruments that could probably address your issue for something in the 3-10K usd range.
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Hi, ???Here is the clip and service manual for the 8590A series. ? ? Regards Yves ? ? I am in the process of repairing a HP8591A spectrum analyser which seems to have a control fault. Apparently the previous owner tried to replace the control board battery, and now the instrument has a control problem. I can get it to work by going into the config menu and resetting the config, when the green Preset button is pressed, it goes into a and less control loop that causes the display to 'jitter'. Can anyone point me to the CLIP and troubleshooting manual? ? ? ? ? ? ? ? ? ? Regards Brad?
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I am in the process of repairing a HP8591A spectrum analyser which seems to have a control fault. Apparently the previous owner tried to replace the control board battery, and now the instrument has a control problem. I can get it to work by going into the config menu and resetting the config, when the green Preset button is pressed, it goes into a and less control loop that causes the display to 'jitter'. Can anyone point me to the CLIP and troubleshooting manual? ? ? ? ? ? ? ? ? ? Regards Brad?
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Re: HP 8753D CAUTIO: NO IF FOUND: CHECK R INPUT LEVEL. Please help
Hi Tom ? For the 8753D that I was repairing, ultimately it was really the YTO that was defective. I took the opportunity to make the electrical diagram of the small interface PCB of the YIG 5086-7934. Perhaps this information will be useful to you. I have provided the link below. ? I am currently making the diagram of another YTO, still for an 8753D. ? /g/HP-Agilent-Keysight-equipment/filessearch?p=name%2C%2C5086%2C20%2C1%2C0%2C0&q=5086-7934 ? Yves ? ? ³Û±¹±ð²õ¡ ? Thanks! That is providing some insight I didn¡¯t have before. ? Tom, N8ZM ?
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From: [email protected] <[email protected]> On Behalf Of Yves Tardif
Sent: Wednesday, November 08, 2023 3:33 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8753D CAUTIO: NO IF FOUND: CHECK R INPUT LEVEL. Please help? Hi Tom, ? You have already verified that the YIG does not carry any power output from 300kHz to 6GHz if I understood correctly, from 10kHz to 300kHz, it is not the YO which is the source. ? The PCB on A3 contains a lot of parts, but nothing complex, and most of them are for controlling the shaded part on the block diagram (Active bias, ALC, switch, temperature, detector...). For the RF section, these parts are mainly micro-electronics as shown on the inside of an 8753 transfer switch. ? The test described in the last email for Hank WD5JFR, could tell you if the pre-tune DAC is functional, it's a starting point. ? On the YO PCB, there are only a few parts: 2 capacitors, 2 resistors, 2 diodes, and a potentiometer. I also see 2 other power point tests, +5V and +15V. I haven't completely disassembled this section, but this is what I can see. ? I looked at section A3 this morning, I took a photo of this card...as an attachment. ? 
? Transfert switch 
? This is the type of part found on the A3_PCB LM35D????????????????? OPAMP TL072???????????????????? OPAMP OP27???????????????????? OPAMP OPA2210????????????? OPAMP SSM2220????????????? OPAMP MMPQ2222A???? QUAD 2N2222A AD7542???????????????? DAC AD7825???????????????? QUAD DAC DG408?????????????????? SW DG413?????????????????? SW LM339?????????????????? COMP MC3407??????????????? OPAMP 74ALS273???????????? OCTAL D FLIP-FLOPS 74ALS175???????????? QUAD DIFF LINE RECEIVER ULN2003A?????????? 7 DARLINGTON TRANSISTORS ARRAY 74ALS138???????????? DEMULTIPLEXER ? ? ? HI ³Û±¹±ð²õ¡ ? I don¡¯t think anyone outside of HPAK ever had an official one for the ES; I was just asking if you had drawn up something yourself. ? It has been a few months sine I tried to repair it, but the initial symptom was np RF above the 3 GHz band change, but then the lower frequencies also died. At the time, someone suggested a possibly shorted tantalum cap on the PC board, which I could confirm by measurements with the part on the board, but it¡¯s an SMD type part and I haven¡¯t yet obtained the proper equipment to remove it with doing a lot of collateral damage. Other necessary activities came along since then (what? Life outside of test equipment? Who knew?) so I haven¡¯t re-engaged yet. But this conversation is getting me fired up as I really like the ES for its overall simplicity compared to some newer VNA¡¯s I have. ? Anyway, thanks for your comments. ? Tom, N8ZM
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Jared Cabot
KB2LMN
VeeCal