HP (Hewlett-Packard) EPM-442A Music Mixer User Manual


 
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