Zeroing And Calibrating The Power Meter; Zeroing The Power Meter; Zero/Cal Lockout - Agilent Technologies E4418B User Manual

Zeroing and Calibrating the Power Meter

This section describes how to zero and calibrate the power meter. You should always
zero the power meter prior to calibrating it.

Zeroing the Power Meter

Zeroing adjusts the power meter for a zero power reading with no power applied to
the power sensor. During zeroing, which takes approximately 10 seconds, the wait
symbol is displayed.
To zero the power meter:
Zero
1. Press ,
Zero
Cal
When to Zero?
Zeroing of the power meter is recommended:
0
• when a 5 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.

Zero/Cal Lockout

The Zero/Cal Lockout facilty provides a means of ensuring that a measurement
cannot be taken until the connected sensor has been zeroed and calibrated. If the
Zero/Cal Lockout facilty is enabled and a sensor is connected which has not been
zeroed and calibrated, then the display window for the sensor will display the
message "Please Zero + Cal ChA".
If you zero the sensor before calibrating it, the message changes to "Please Cal ChA".
If you calibrate the sensor before zeroing it, the message changes to "Please Zero
ChA".
The Zero/Cal Lockout facility can be enabled/disabled through either the System
Inputs menu or the Zero Cal menu as follows:
System
Press ,
More
Inputs
Zero
Press ,
More
Cal
Agilent E4418B User's Guide
Zeroing and Calibrating the Power Meter
. During zeroing the wait symbol is displayed.
,
Must Cal Off
, or
Must Cal Off
Power Meter Operation
or .
On
.
On
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