To Perform A Calibration Check - HP 8712C User Manual

3. Plot the results to disk or to hard copy for later comparison.
4. Compare subsequent calibration checks against the initial one and keep
track of the time interval between the first calibration check and later
ones.
5. When the residual errors have drifted beyond what is acceptable, note
the time interval and use that information to determine what is the best
calibration interval for your measurements.
6. Repeat the process above enough times to feel confident that your
calibration interval is correct.
The calibration check feature can be used on any of the transmission or
reflection calibrations available (including the factory default calibration). See
Table 6-2.
Table 6-2. Calibration Check Error Terms
Meesurement Celibretion
Transmission
Default
Response
Response & Isolation
Enhanced Response
Test Set3
Reflection
Default
Port
One
Test Set3
1 0 -
Open, S - Short, L - Load, T - Thru
2 See 'Error Term Oascriptions and Typical Values", later in this chapter.
3 Used with HP 87075C multiport test set only
Calibrating for Increased Measurement
Needed
Source Match, Load Match, Transmission Tracking
Source Match, Load Match, Transmission Tracking
Source Match, load Match, Transmission Tracking, lsolatio
Source Match, load Match, Transmission Tracking
Source Match, Load Match, Transmission Tracking
Directivity, Source Match, Reflection Tracking
Directivity, Source Match, Reflection Tracking
Accuracy
Check the Calibration
Error Terms2
Computed
6-27
n