HP 8921A - To Set a Specific Reference; To Use the Present Value as a Reference; Setting a Measurement Reference

70
Chapter 3, Operating Overview
Setting A Measurement Reference
Setting A Measurement Reference
The REF SET function establishes a measurement reference point. This allows
you to make a direct comparison between two measurement results, or between a
measurement standard and the actual measurement results.
Referenced measurements are displayed in one of two ways, depending on the
type of measurement:
Displayed value = Measurement − Reference. The difference between the measured
value and the reference value is displayed in the same unit-of-measure.
or
Displayed value = Measurement ÷ Reference. A ratio of the measured value to the
reference value is displayed in dB.
To Use the Present Value as a Reference
1. Position the cursor in front of the unit-of-measure for the measurement you want to set
the reference for.
2. Press and release the SHIFT key, then the INCR ÷10 key to access the REF SET func-
tion; then press enter ENTER.
3. Ref appears below the measurement.
The measurement displayed is now referenced to the measurement value present
when the reference was set.
To Set a Specific Reference
1. Position the cursor in front of the unit-of-measure for the measurement you want to set
the reference for.
2. Press and release the SHIFT key, then the INCR ÷10 key to access the REF SET func-
tion.
3. Enter a reference value.
4. Ref appears below the measurement value to indicate a reference has been set.
The measurement displayed is now referenced to the value you entered.