2
Operating Your Instrument
110
Keysight 53147A/148A/149A Operating and Programming Guide
Offsetting a Power Measurement
You can use the power offset (
Pwr Offset
) function to add or subtract a constant
value to/from a power measurement. For example, you can use an offset to
compensate for a systematic error, to display the difference
in power between two signals, or to compensate for losses and attenuation in
cables or components that are between the signal source and the Power Meter.
To display an offset power measurement, you set the value and sign (+/–) of the
offset and turn the Power Offset function on.
Power Offset Example
1 Connect a signal to the Power Meter input connector, and activate power
measurement by pressing the Display Power key.
The display should look like this (the values are simulated in these
illustrations):
2 Press the Shift key, and then press the Pwr Offset (Avg) key.
The
Shift
annunciator activates when you press the
Shift
key. When you press
the
Pwr Offset
key, the
Shift
annunciator and the frequency display disappear,
the
Pwr Offset
annunciator at the left side of the display activates, and the
power-offset value is set to 00.00, as shown below:
dB
dBm
Watts
mW
uW
%
Pwr
Ch 2
Freq
dB
dB
Watts
mW
uW
%
Ch 12
Rel Freq
Rel
Pwr
Offset
NOTE
If the power-offset value was previously changed, the previous value is
displayed instead of 00.00.
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