prog.book : chapter1.fm 11 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Zeroing and Calibrating the Power Meter
HP E4418B/E4419B Programming Guide 1-11
Zeroing and Calibrating the Power Meter
This section describes how to zero and calibrate the power meter.
The calibration and zeroing commands are overlapped commands refer to
“Using the Operation Complete Commands”, on page 1-89 to determine
when the commands are complete.
Zeroing
Zeroing adjusts the power meter’s specified channel for a zero power
reading with no power applied to the power sensor.
The command used to zero the power meter is:
CALibration[1|2]:ZERO:AUTO ONCE
The command assumes that there is no power being applied to the sensor.
It turns the power reference oscillator off, then after zeroing, returns the
power reference oscillator to the same state it was in prior to the command
being received. Zeroing takes approximately 10 seconds depending on the
type of power sensor being used.
When to Zero?
Zeroing of the power meter is recommended:
• when a 5
0
C change in temperature occurs.
• when you change the power sensor.
• every 24 hours.
• prior to measuring low level signals. For example, 10 dB above the
lowest specified power for your power sensor.
Calibration
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
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