Agilent Technologies Microwave Oven 53150A 用户手册

Chapter 2  Operating Your Frequency Counter

2-20

Operating Guide

Measuring Relative Frequency

You can measure the difference in frequency from one measurement to 
another (frequency drift) or between two separate input signals using the 
Relative Frequency function. 

Press the Shift key, and then press the Rel Freq (FREQ Offset On/Off) 
key. The Shift annunciator activates when you press the Shift key. When 
you press the Rel Freq (FREQ Offset On/Off) key, the Shift annunciator 
disappears, and the Rel Freq annunciator in the upper-left corner of the 
display activates. At the same time, the Counter saves the frequency 
measurement it was displaying at the time you pressed the Rel Freq key, 
and it computes and displays the difference between that measurement 
and the current measurement.

You can also use the Relative Frequency function to measure the 
difference between two different signals. To do this, activate the Relative 
Frequency 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 frequency difference between 
the two signals.

Ch    2

Rel Freq