Could be worth trying a wideband module cal. No external standards required
Incorrect. You need 5790A to complete wideband module cal.
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According to the service manual
"For wideband gain calibration, the only required equipment other than that supplied as
standard equipment with the wideband option is a Type "N" female to dual banana plug
adapter (e.g., Pomona 1740)."
That is what I was referring to, but yes you do need the 5790 for complete verification.
Swapping boards willy-nilly with unserviced power supply cards A16,A17,A18 is a very nice way to kill good boards from other "donor" unit. Perfectly fine if you want to end up with two broken units, instead of one
Yes correct, I hadn't considered this. A fault on the power supply A16, A17, A18 potentially could have caused the fault on another card. Swapping in a new card from another unit could blow the new card.
I already have two broken units. The donor unit
was until recently certified working with valid cal status, but has developed a fault on the high voltage output. This was prior to me touching it. I was hoping I might be able to make one working unit out of the two faulty ones by swapping the cards. This appears to be a bad idea though.
I swapped the the A12 card which did resolve the +/-15v osc issue. So I guess this means the cal constants will now be incorrect for that card ?
I've never used Python, so I'm not sure how to use the code to get a calcheck printout. Do I copy/paste the code into the GPIB command box ?