Operating Your Frequency Counter 2
Keysight 53150A/151A/152A Operating Guide 83
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.
Relative Frequency Example
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
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