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HP4402.book : chapter2.fm 8 Fri Feb 12 15:32:45 1999
Power Meter Operation
Zeroing and Calibrating the Power Meter
2-8 HP E4419B User’s Guide
If you calibrate the sensor before zeroing it, the message changes to
“Please Zero ChA” or “Please Zero ChB” depending on which channel the
sensor is connected to.
The Zero/Cal Lockout facility can be enabled/disabled through either the
System Inputs menu or the Zero Cal menu as follows:
Press , , , or .
Press , , or .
Calibrating the Power Meter
Calibration sets the gain of the power meter using a 50 MHz 1 mW
calibrator as a traceable power reference. The power meter’s POWER REF
output or a suitable external reference is used as the signal source for
calibration. An essential part of calibrating is setting the correct reference
calibration factor for the power sensor you are using. The HP 8480 series
power sensors require you to set the reference calibration factor. The
HP E-series power sensors set the reference calibration factor
automatically. During calibration the wait symbol is displayed. Offset,
relative and duty cycle settings are ignored during calibration.
Note During calibration the power meter automatically switches the
power reference calibrator on (if it is not already on), then after
calibration it switches it to the state it was in prior to the
calibration.
Calibration Procedure Using HP E-Series Power Sensors
The following procedure describes how you calibrate the power meter with
an HP E-series power sensor. Since the power meter automatically
downloads the HP E-series power sensor’s calibration table there is no
requirement to enter the reference calibration factor. The power meter
identifies that an HP E-series power sensor is connected and will not
allow you to select certain softkeys. The text on these softkeys appears
grayed out.
System
Inputs
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Must Cal Off On
Zero
Cal
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Must Cal Off On