Measuring Relative Power; Relative Power Example - Agilent Technologies 53151A Operating Manual

Chapter 2 Operating Your Frequency Counter

Measuring Relative Power

Measuring Relative Power

You can measure the difference in power from one measurement to another
or between two separate input signals using the Relative Power function.

Relative Power Example

Press the Shift key, and then press the Rel Pwr (PWR Offset On/Off) key.
The Shift annunciator activates when you press the Shift key. When you
Ch 12
press the Rel Pwr key, the Shift annunciator disappears, and the Rel Pwr
Rel Freq
annunciator at the left side of the display activates. At the same time, the
Counter saves the power measurement it was displaying at the time you
Rel Pwr
pressed the Rel Pwr key, and it computes and displays the difference in
power between that measurement and the current measurement.
NOTE When the Counter is set to measure power in dBm, relative power is
expressed in dB. When the Counter is set to measure power in Watts, mW,
or, µW, power relative power is expressed as a percentage (%).
You can also use the Relative Power function to measure the difference in
power between two different signals. To do this, activate the Relative
Power function, as described in the previous paragraph, disconnect the
cable supplying the signal to the input connector, and then connect the
second signal to the same input connector. The value displayed when the
Counter acquires the second signal is the power difference between the
two signals.
2-26 Operating Guide