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:
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:
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!
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:
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!
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.
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.
Greetings all. I have been piecing together a HP 70K series spectrum analyzer for my small home test and measurement lab. So far things are working, however the battery in the HP 70900A local oscillator is bad, does anyone know where I can get a suitable replacement battery (i.e. Digikey / Mouser)? I can open the oscillator and look but I'd rather open it just once when changing it out. I also have a bad battery in the HP 70206A display unit but that one is ordered and I'm waiting for it to show up. Despite these issues I really like the modular approach to these instruments. Many leaps and bound over my other spectrum analyzer (HP 853A w/ HP 8557A).
I have been going to the Keysight and downloading all the manuals I can find for the modules I have and future modules I will install later. The documentation for the HP 70900A module is pretty detailed but I haven't been able to find schematics or parts lists (yet). I figured I'd at least post the question here since someone somewhere has had to deal with this issue before. My first choice was the HP 856x series but had a difficulty finding one that wasn't all beat up, had previous calibration stickers removed improperly or wasn't over priced. But all in all I like the 70k for the flexibility.
Thanks! I had a sneaky suspicion that it was the same battery used in the HP 70206A display only with leads attached. One is on the way, Both of these batteries are in the AA form factor and I have discovered a regular 1.5v AA can be used in a pinch in the 70206A if need be, at least long enough to get rid of the confidence check error on boot up. WOW, a NOS HP 8566B, that's quite the score. Most HP 8566B's I find on eBay are pretty beat up with an array of issues ranging from gouged front panels, missing knob caps, missing or broken rack handles, etc. Every now and then you can find a nice one.
A buddy of mine who used to work for Motorola rescued one that was headed to the dumpster, all because they couldn't find one of the interconnect cables. Other instruments rescued form the dumpster included several HP 8590, 8560 spectrum analyzers, Tektronix 24xx series scopes (one is a Tektronix 2465 I got for free) and a mint Bird 43 watt meter with slugs I paid $30 for. It's astonishing what is thrown away all because they don't want to spend the time to auction it off.
Once again, thanks for the help!