Power Meter Operation 2
E4418B Power Meter User’s Guide 29
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:
1 Press , . During zeroing, the wait symbol is displayed.
When to Zero?
Zeroing of the power meter is recommended:
• 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 facility provides a mean of ensuring that a measurement
cannot be taken until the connected sensor has been zeroed and calibrated. If
the Zero/Cal Lockout facility is enabled and a sensor is connected which have
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”.
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