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| HP 70K/HP 70000 Modular Measurement System Thread |
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| VE7FIM:
--- Quote from: pquadrat on February 05, 2018, 09:05:06 pm ---But I have a problem (not sure if it is a problem): The system has the 70300A Tracking Generator (20Hz-2,9GHz) included. When I check the frequency of the tracking generator (span 0Hz, not sweeping), it is off for a different amount depending on resolution BW of the analyzer. But the offset is constant even for very different output frequencies: --- End quote --- I tried to reproduce this problem with my system, but was unable to. Can you upload a photo of the rear of your system? The Tracking Adjust is only +/- 500 Hz, where the Tracking Offset is up to +/- 10 MHz, and is done via the 21.4 MHz input, so an issue with the 21.4 MHz input that could be related to what you are seeing. P.S. Impressive soldering job there on the firmware upgrade! |
| pquadrat:
--- Quote from: VE7FIM on March 16, 2018, 09:20:54 am --- --- Quote from: pquadrat on February 05, 2018, 09:05:06 pm ---But I have a problem (not sure if it is a problem): The system has the 70300A Tracking Generator (20Hz-2,9GHz) included. When I check the frequency of the tracking generator (span 0Hz, not sweeping), it is off for a different amount depending on resolution BW of the analyzer. But the offset is constant even for very different output frequencies: --- End quote --- I tried to reproduce this problem with my system, but was unable to. Can you upload a photo of the rear of your system? The Tracking Adjust is only +/- 500 Hz, where the Tracking Offset is up to +/- 10 MHz, and is done via the 21.4 MHz input, so an issue with the 21.4 MHz input that could be related to what you are seeing. P.S. Impressive soldering job there on the firmware upgrade! --- End quote --- Just a quick reply: I was able to solve the problem, I used a differnet set of SMB cables, I think one of my interconnect cables has a problem. After working on the system, the issue disappeared once, but came back soon. But now I think it is working reliable. |
| pquadrat:
I had to replace the YTO module on one of my 70900B (took it from my 70900A, which was working fine). I got it adjusted, without the help of the old BASIC maintenance software. I found the software on Keysight's web site, but was not able to see the BASIC code, it is a "packed" BASIC format. Sometimes it is referred as "Module Verification Software", sometimes "Operation Verifcation Software". Is this the same? Is this also the software for calibration/adjustements? Does anyone know how to make the files readable? I do not want to set up a HP 9000 series 300 computer, I just want to send the rightHP 70000 instructions directly via GPIB. Thanks |
| pquadrat:
--- Quote from: pquadrat on March 21, 2018, 02:36:45 pm --- --- Quote from: VE7FIM on March 16, 2018, 09:20:54 am --- --- Quote from: pquadrat on February 05, 2018, 09:05:06 pm ---But I have a problem (not sure if it is a problem): The system has the 70300A Tracking Generator (20Hz-2,9GHz) included. When I check the frequency of the tracking generator (span 0Hz, not sweeping), it is off for a different amount depending on resolution BW of the analyzer. But the offset is constant even for very different output frequencies: --- End quote --- I tried to reproduce this problem with my system, but was unable to. Can you upload a photo of the rear of your system? The Tracking Adjust is only +/- 500 Hz, where the Tracking Offset is up to +/- 10 MHz, and is done via the 21.4 MHz input, so an issue with the 21.4 MHz input that could be related to what you are seeing. P.S. Impressive soldering job there on the firmware upgrade! --- End quote --- Just a quick reply: I was able to solve the problem, I used a differnet set of SMB cables, I think one of my interconnect cables has a problem. After working on the system, the issue disappeared once, but came back soon. But now I think it is working reliable. --- End quote --- Please ignore the things I have written above. The cables were not the cause, this issue occurs with one of my two HP 70902A IF sections. With the other 70902A in the system, all is fine, and the output frequency of the tracking generator is correct. Problem is, this IF section has a noise problem. |
| VE7FIM:
--- Quote from: pquadrat on March 21, 2018, 02:54:41 pm ---Does anyone know how to make the files readable? I do not want to set up a HP 9000 series 300 computer, I just want to send the rightHP 70000 instructions directly via GPIB. --- End quote --- Unfortunately, the HP 70K verification and calibration software is written in Rocky Mountain Basic, and uses pre-compiled routines that aren't easy to translate or emulate on other platforms. While one could watch the GPIB traffic to reverse engineer what the software is doing to the MMS module, the conditional logic and calibration constants still would need to be extracted from the software. As an aside, this _would_ be a good approach to make re-loading the firmware on a 70700A easier. This is a common problem, since when the battery goes on this module, the firmware is lost ("pgm gone"). Getting a 9000 Series 300 system up and running is the easiest way to run this software. |
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