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Testing the Frequency Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s frequency function, do the following:
1. Connect the calibrator to the and COM inputs on the meter.
2. Note: The accuracy of the calibrator’s frequency function must be appropriate for the specified
accuracy of the meter.
3. Set the rotary switch to .
4. Set the calibrator or function generator for the square wave voltage and frequency for steps 1-6 of
Table 7a.
5. Compare the reading on the meter display with the display reading shown in Table 7a.
6. If the display reading falls outside of the range shown in Table 7a, the meter does not meet
specification.
Table 7a Frequency Test:
Step Range Source Level Reading
1 100Hz 9.0Hz 3V rms 8.987 to 9.013
2 100Hz 90Hz 3V rms 89.87 to 90.13
3 1kHz 900Hz 3V rms 898.7 to 901.3
4 10kHz 9kHz 3V rms 8.987 to 9.013
5 100kHz 90kHz 3V rms 89.87 to 90.13
6 1MHz 900kHZ 3V rms 898.7to 901.3
Testing the Duty Cycle Function (for 61-340 / 61-342)
To verify the accuracy of the meter’s frequency function, do the following:
1. Connect the calibrator to the and COM inputs on the meter.
2. Note: The accuracy of the calibrator’s frequency function must be appropriate for the specified
accuracy of the meter.
3. Set the rotary switch to .
a. Press the Hz/DUTY button to select the DUTY CYCLE function
4. Set the calibrator or function generator for the square wave voltage and frequency as Table 7b.
5. Compare the reading on the meter display with the display reading shown in Table 7b.
6. If the display reading falls outside of the range shown in Table 7b, the meter does not meet
specification.
Table 7b Duty Cycle Test:
Step Range Source Level Reading
1 1kHz 1kHz 3V rms 48.3% to 51.7%
Form Number 2 TM61340-2 Rev November 2007