Getting Started 1
Keysight 53150A/151A/152A Operating Guide 51
Measuring Relative Power
You can measure the difference in power from one measurement to another (drift)
using the Relative Power function. You do this by pressing the Shift and Rel Pwr
(Offset On/Off) keys, as shown in the diagram below (this example assumes that
a signal is currently applied to Channel 2).
The Counter stores the current power reading when you press the Rel Pwr key. It
then subtracts this value from all subsequent readings and displays the difference
until you press the Rel Pwr key again.
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 or to display the difference in power between
two signals.
To display an offset power measurement, you need to set the value and sign (+/–)
of the offset and to turn the Power Offset function on. In the following diagram,
Ch 2
Freq
Pwr
dBm
Shift
Shift
Ch 2
Freq
Pwr
dBm
Offset
On/Off
Rel Pwr
Ch 2
Freq
Rel Pwr
dB
NOTE
The Power Offset and Relative Power functions can be used simultaneously.
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