Chapter 2 Operating Your Frequency Counter
Using the LIMITS Menu Keys
2-32 Operating Guide
2
To Set and Use Automatic Limit Testing
Limits Testing Example 1—Flag and Stop Measuring On Limits
Automatic limit testing can be used to monitor a test signal to assure that it does not
drift outside of a user-entered set of limits.
For demonstration purposes, you want to first measure the frequency of a 10 MHz
signal applied to channel 1 of the Counter. Next, you want to set limits that would
cause the Counter to flag (turn on the Limits annunciator in the front-panel display)
and stop making measurements if this signal drifts more than ±1 kHz.
1 Connect the 10 MHz input signal to channel 1 of the Counter, and press Freq Ch
1 key.
Assume that the frequency measured is 10 MHz. If the drift is not to be larger than
±1 kHz, then the upper limit should be set to 10.001 MHz and the lower limit to 9.999
MHz. Let’s set these values in the following steps.
2 Press Uppr/Lower key until UPPR: is displayed.
UPPR: 0.000000 is displayed (0 is the default value).
3Set UPPR to 10.001 MHz. (Refer to the section in Chapter 1 titled “To Set Limits of
Measurements” if needed.)
NOTE After you enter the value 10.001 MHz, BE SURE to press the Enter key to
complete the entry.
4 Press Uppr/Lower key, if required, until LOWR: is displayed.
LOWR: 0.000000 is displayed (0 is the default value).
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