According to the 8753 firmware history page:
Quote
Agilent 8753C's can be used with the Agilent 85044A/B,and both solid-state switch and mechanical switch versions of the 85046A/B or 85047A.
Unquote
I have an 8753C with 4.02 firmware and a 85046A with mechanical switch. When I power the unit on I first see PORT 2 on the test set on, then a click, then PORT 1 is on. But I then cannot get PORT 2 on, so I can't measure S22 or S12. This test set works fine with my 8753B (but my B's display is dimming, so I just got the C).
Scott Olson
Quote
Agilent 8753C's can be used with the Agilent 85044A/B,and both solid-state switch and mechanical switch versions of the 85046A/B or 85047A.
Unquote
I have an 8753C with 4.02 firmware and a 85046A with mechanical switch. When I power the unit on I first see PORT 2 on the test set on, then a click, then PORT 1 is on. But I then cannot get PORT 2 on, so I can't measure S22 or S12. This test set works fine with my 8753B (but my B's display is dimming, so I just got the C).
Scott Olson
Have you tried preset, S22?
On preset, if you hit the meas key, it should show S-parameters; if it shows A, B, R etc parameters, then the FW thinks it does not have a test set.
The sense is from one of the lines on the test set cable. If you use a printer cable, sometimes the lines are missing or crossed, you need to use the correct test set cable.
The b just looked for a single hi/low line (before 6 GHz or solid state switches were available); The C looks for a very basic serial string (I think 1 high is a 46). check the cable for test set connection.