user manual

Chapter 1 Getting Started

Operating the Counter

1-24 Operating Guide

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.

NOTE The Power Offset and Relative Power functions can be used simultaneously.

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, the Power Offset function is enabled first, and the

Ch 2

Freq

Pwr

dBm

Shift

Ch 2

Freq

Pwr

dBm

Offset

On/Off

Rel Pwr

Ch 2

Freq

Rel Pwr