Power Sensor Remote Operation 1
U2000 Series Programming Guide 5
Zeroing and Calibrating the U2000 Series USB Power Sensors
The U2000 Series USB power sensors do not need manual calibration and zero
routines performed. These are performed without removing the power sensor
from the source, which is known as internal zeroing. With internal zeroing of
U2000 Series USB power sensors, there is no need to disconnect the sensor or
power- off the device- under- test (DUT). The U2000 Series does not require 50
MHz reference signal calibration, thus allowing factory calibration for
ensuring measurement accuracy. However, users are recommended to perform
external zeroing for input signals below –30 dBm for best accuracy.
Zeroing
Zeroing adjusts the power sensor for a zero power reading.
The command CALibration[1]:ZERO:AUTO [ONCE|ON|OFF|0|1] causes the
power sensor to perform its zeroing routine when enabled. This adjusts the
power sensor for a zero power reading.
1|ON can only be used for internal zeroing. When 1|ON is enabled the zero is
maintained by a combination of zero on-the-fly for measurements and
temperature compensation.
Zeroing of the power sensor happens automatically:
•When a 5
o
C change in temperature occurs
• When you change the power sensor
• Every 24 hours
To perform external zeroing, the command CALibration[1]:ZERO:TYPE
EXTernal is used, following by CALibration[1]:ZERO:AUTO ONCE to start
the zeroing process.
Calibration
There is no calibration needed in U2000 Series USB power sensors. The
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