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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