HP HP 8712ET, User Manual, Page: 255 / 480

ET User’s Guide 6-29
Calibrating for Increased Measurement Accuracy
Checking the Calibration
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.
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, “Calibration Check Error Terms.”
Table 6-2 Calibration Check Error Terms
1. O = Open, S = Short, L = Load, T = Thru
2. See
“Error Term Descriptions and Typical Values” on page 6-31 .
3. Used with multiport test sets.
Measurement
Type
Calibration
Types
Standards
Needed
1
Error Terms
2
Computed
Transmission Default
Response
Response &
Isolation
Enhanced
Response
Test Set
3
O,S,L,T
O,S,L,T
O,S,L(2),T
O,S,L,T
O,S,L,T
Source Match, Load Match, Transmission Tracking
Source Match, Load Match, Transmission Tracking
Source Match, Load Match, Transmission Tracking,
Isolation
Source Match, Load Match, Transmission Tracking
Source Match, Load Match, Transmission Tracking
Reflection
Default
One-Port
Test Set
3
O,S,L
O,S,L
O,S,L
Directivity, Source Match, Reflection Tracking
Directivity, Source Match, Reflection Tracking
Directivity, Source Match, Reflection Tracking