To Measure Frequency - HP 53131A Operating Manual

Chapter 2 Operating Your Universal Counter
Using the MEASURE Menu Keys

To Measure Frequency

1 Connect power source to Counter, and turn on Counter.
All segments of the front-panel display will light up while the Counter
performs its power-on self-test, and then dashes are displayed.
The Counter is now ready to measure frequency of a signal applied to
CHANNEL 1 input. Note that the Freq and Ch1 annunciators light.
2 Connect an input signal to CHANNEL 1.
The Counter should automatically display the measured frequency of the
input signal. The trigger levels are set to the 50% points of the signal.
However, you may disable auto triggering, and change the trigger levels
and slopes.
To set up CHANNEL 1's coupling, impedance, and triggering conditions to
match the input signal you are trying to measure, refer to the procedures
"To Select Input Coupling and Impedance" and "To Set Input Channel
Trigger Level/Sensitivity" in Chapter 1, "Getting Started," or the section
titled "Using CHANNEL 1 and CHANNEL 2 Input Conditioning Keys" in
this chapter.
3 Press the Freq/Ratio key until FREQUENCY 2 is displayed to measure
the frequency of an input signal applied to CHANNEL 2.
FREQUENCY 2 is momentarily displayed, the Freq and Ch2
annunciators light, and the Counter is ready to measure frequency of a
signal applied to CHANNEL 2 input. The trigger levels are set to the
50% points of the signal. However, you may disable auto triggering, and
change the trigger levels and slopes.
4 To measure the frequency of a signal applied to optional CHANNEL 3
input, repeat step 3 until FREQUENCY 3 is displayed.
FREQUENCY 3 will be momentarily displayed and the Freq and Ch3
annunciators will light. The Counter will be ready to measure the
frequency of a signal applied to CHANNEL 3 input.
Note that the Frequency 3 menu item is not available in Counters that do
not contain optional Channel 3.
Operating Guide 2-11