Products > Test Equipment
HP 70K/HP 70000 Modular Measurement System Thread
dxl:
--- Quote from: cncjerry on October 06, 2022, 04:34:30 pm ---I'll add the wider 70903A IF module and go from there. So now I am going to sell my 8568b with 85685a, my R&S FSB and I'm kicking around selling my 8566B but note, and reason for my post, that to get the MMS to 22Gig, you have to spend a fair amount of money. What modules do I need to take it to 22Gig?
--- End quote ---
Not sure whether i get the question. If you have a 70908A with it, you have already a frequency range up to 22GHz? The only other option is the 70909A/70910A which go up to 26.5GHz, but they have no fundamental mixing.
cncjerry:
yes, I just went back and looked and that does go to 22gig. I guess I was looking at the tracking generator and that is limited to 2.9gig.
Other question, with the TG I can do scalar but is there a VNA option for the MMS?
cncjerry:
I posted this in the groups.io site about the sidebands I see in all signals, not just the cal posted here and was wondering if others see the same thing?
Thanks
cncjerry:
if you have an MMS analyzer, if you wouldn't mind posting a picture or just the results as below:
a view of the 300Mhz cal signal with:
span: 1Khz
RBW: 10.0hz
VBW: 10.0hz
atten: 10dB
scale: 10dB per div
RL: -10dB
My analyzer requires me to hit the reference line down once or twice to get to -10db.
and if you don't want to post, find the 300Mhz peak and then check the dBc to the right or left at 120, 18, 240 or 300hz offset, whichever is highest. I'm seeing about -83dBc or so with my noise floor much lower, down around -90 or so. If I can get rid of the line noise...
Thanks
Jerry
Oldtestgear:
I have an early 70900a that is not working -- seems to loop around self test -- which I hope is down to an EPROM failure. Now the problem. Mine uses six 27512 EPROMs, not eight as used in later variants.
Does anyone have a copy of the firmware I need for this one? Codes are:
70900-80031
70900-80032
70900-80033
70900-80034
70900-80035
70900-80036
Any help appreciated as it would be nice to see if the firmware is the problem before trying any other options.
I aslo bought a 70004a display from the same source which did have a dead EPROM but I copied the file from another display to get it working again.
Thanks in advance
Phil
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