开云体育

Working on a 85047A test set which needs to be retrofitted with mechanical switch 33311B, as it has dead solid state switch and will be used with 8573A analyzer (pre-dates the 85047A). Goal is to end up with an 85047A opt 009. This issue has to do with interaction of the switch control board (back panel) and the analzyer's port A(1) and B(2) switching controls.

The 8753A analyzer is working normally with an 85046A opt 009 (mechanical switch) which was retrofitted from solid state at some point in the past. The 8753A is on firmware 1.01.

The analyzer has never been tried with an 85047A since I've had it.

The switch control board (along back panel) has three jumpers defined - J3, W1 and W2. J3 is not discussed in the manual but is installed from factory. I've installed 0.025" square (typical wire-wrap style) pins on the back side of the board for J3, W1 and W2 so that they can be reconfigured without pulling the board from the chassis.

As built (with solid state switch)

J3 - present (not mentioned in manual)
W1 - absent
W2 - absent
Behavior - port B selected <1 second during power-up, never again.

As documented (with mechanical switch)

J3 - present (not mentioned in manual)
W1 - absent
W2 - present
Behavior - port B selected <1 second during power-up, never again.

Other experiments

J3 - present (not mentioned in manual)
W1 - present
W2 - absent
Behavior - port B selected ~3 seconds during power-up, never again.

J3 - present (not mentioned in manual)
W1 - present
W2 - present
Behavior - port B selected ~3 seconds during power-up, never again.

So, at this point I cannot get the analyzer to switch to port B (right hand port) when initiating a 1-port S22 calibration.

Any suggestions at this point?

I believe the control module (rear panel) has one or more abnormalities - I tried setting attenuator (stimulus>power>attenuator 1) and rather than adjusting the attenuator, the test set switched ports or had other abnormal responses depending on the selected attenuator value. This misbehavior occurred regardless of W1 and W2 jumper presence/absence.

Given this, my original posting about setting option 009 is incorrect as the test set is malfunctioning in other ways and will require repair, not just reconfiguration. (I re-routed cable back to my original test set and it continues to work normally, so the issue is in the test set under consideration.)

Dave