User`s guide

General Power Meter Functions 2
N1911A/1912A P-Series Power Meters User’s Guide 107
Zeroing and Calibrating the P-Series Sensor
This section describes how to zero and calibrate the power meter when
using a P- Series wideband power sensor.
Zeroing
Zeroing adjusts the power meter for a zero power reading on each power
meter channel and P- Series sensor combination. This is achieved without
removing it from a power source. The power meter can be set to
automatically zero on-the-fly while you are using it. Alternatively, you can
perform a zero at your preference. During zeroing a wait symbol is
displayed.
Figure 2-87 Zeroing pop-up
When the P- Series power sensor is initially connected to the power meter,
it automatically performs a Zero and Calibration routine.
When to Zero?
Zeroing of the power meter is recommended:
•When a 5
o
C change in temperature occurs.
• Every 24 hours.
• Prior to measuring low level signals. For example, 10 dB above the
lowest specified power for your power sensor.
Automatic Zero
The automatic zero can be enabled as follows: