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HP4402.book : chapter2.fm 11 Wed Apr 23 15:29:05 1997
Power Meter Operation
Making Measurements with the HP 8480 Series Power Sensors
HP EPM-442A User’s Guide 2-11
6. The current setting of the reference calibration factor is displayed
under the softkey. To change this setting press
. The power meter displays the reference calibration
factor in a pop up window. Modify this reference calibration factor
(see below) as desired.
■ Use or to modify the digit on which the cursor is
currently positioned.
■ Use or to move to other digits.
7. To confirm your choice press .
8. Press , to calibrate the power meter. During
calibration the wait symbol is displayed. (The power meter
automatically turns on the POWER REF output.)
9. Press . The current setting of the calibration factor is
displayed under the softkey. To change this setting
press . The power meter displays the calibration
factor in a pop up window. Modify this calibration factor (see
below) as desired.
■ Use or to modify the digit on which the cursor is
currently positioned.
■ Use or to move to other digits.
10. To confirm your choice press .
11. Connect the power sensor to the signal to be measured.
12. You must set the display to the type of measurement you require.
This can either be a direct channel measurement, a ratio
measurement of both channels, or a difference measurement
between both channels. Use the following key presses:
Press , . Select the appropriate softkey for
the measurement you require, either , , , , or ,
then , or .
13. The measurement result is now displayed.
Example
To make a measurement on channel A with a power sensor which has a
reference calibration factor of 99.8% and a calibration factor of 97.8% at
the measurement frequency.
• Disconnect the power sensor from any source.
• Press .
• Press .
• Press .
A Ref CF
A Ref CF
%
Cal Cal A
Frequency
Cal Fac
A Cal Fac
A Cal Fac
%
Meas
Setup
Input Select
A B A/B B/A
More
A-B B-A
Zero
Cal
Zero A
Cal