HP 8924C User Manual page 51

To Change the Measurement Display
To Set 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 as either a ratio (dB) or difference
between the measured value and the 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 select the REF SET func-
tion.
3. Enter the reference value.
4. Ref appears below the measurement value to indicate that a reference has been set. The
measurement field may display a different unit-of-measure, and limit choices for units.
Front-Panel Example
The following front-panel operation sets a 10 dBm reference for
measurements.
1. Move the cursor in front of the unit-of-measure for the Avg Power measurement).
2. Press and release the SHIFT key, then the INCR ÷10 key.
3. Enter 10 dBm using the DATA keys.
The abbreviation Ref will appear below the Avg Power measurement field and
Avg Power measurements will be expressed in dB. Absolute power (mW, W) will
not be selectable.
HP-IB Example
The following HP-IB command also sets a 10 dBm reference for
measurements.
"DISP CCNT;MEAS:CDM:AVGP:REF 10 DBM"
S:\HP8924C\USRGUIDE\BOOK\chapters\opoverv.fb
Chapter 3, Operating Overview
Avg Power
Avg Power
51