HP 8711C User Manual

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Calibrating for Increased Measurement
Accuracy
Check the Calibration
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 tune interval between the first calibration check and later
ones.
5. When the residual errors have drifted beyond what is acceptable, note
the tune 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.
To Perform a Calibration Check
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
Measurement Calibration
Standards’
Error Terms2
Two
Type
Needed
Computed
Transmission Default
OSLT
Source Match, load Match, Transmission Tracking
Response
‘JSS,T
Source Match, load Match, Transmission Tracking
Response & Isolation O,S,L121,T Source Match, load Match, Transmission Tracking, lsolatior
Enhanced Response
O,S,L,T
Source Match, bad Match, Transmission Tracking
Test Sat3
OSLT
Source Match, Load Match, Transmission Tracking
Reflection
Default
O,S,L
Diractivity, Source Match, Reflection Tracking
One Port
OS,L
Diractivity, Source Match, Reflection Tracking
Test Sat3
QSS
Diractivity, Source Match, Reflection Tracking
1
1 0 - Open, S - Short, L - Load, T = Thru
2 See “Error Term Descriptions and Typical Values”, later in this chapter,
3 Used with HP 8707X multiport test set only
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HP 8711C Specifications

General

Brand	HP
Model	8711C
Category	Measuring Instruments
Language	English