Keysight Technologies N5290/1A PNA Series Service Manual page 112

N5290/91A Troubleshooting
N5292A Test Controller Troubleshooting
Equipment required:
— Freeze spray
— PNA 10 MHz to 26.5 GHz (minimum)
— Millimeter-wave head(s)
Setup up system for the head stability check. Refer to
page
between bursts to avoid damaging the module—which is located on the
outside cover which is in close proximity of the connector on the head can
uncover issues with the head. Traces will drift but should track each other and
finally settle. If traces do not track (i.e., separate from each other (greater than
+/-0.1 dB pk-pk) or fail to settle and display power suck-outs or spikes that are
large. This type of behavior indicates a bad head.)
System service calibrations (source, if gain etc) are not typically done
when a system is assembled. Only an installation calibration is required,
because these calibrations are done at the factory and the calibration data
should be stored in the heads. It is up to the FE or customer to determine if
these additional calibrations are required, because the system
performance warrants them to be performed (i.e., head drift over time,
etcetera).
Figure 4-15 Head Stability Check
4-26
4-26. 3 short blasts of freeze spray on screw—wait a second or two
Figure 4-15 on
Keysight N5290/1A Service Guide