Testing The Frequency Function; Testing The Frequency Sensitivity And Trigger Level - Fluke 80 SERIES III Service Information

Testing the Frequency Function

To verify the accuracy of the Meter's frequency function, do the following:
1. Connect the Calibrator to the
The accuracy of the Calibrator's frequency function must be appropriate
for the specified accuracy of the Meter.
2. With the Meter in the 400 mV ac range, press F to enter the Frequency
Counter mode.
3. Set the Function Generator for the sine wave voltage and frequency called for in step
1 of Table 5.
4. Compare the reading on the Meter display with the display reading shown in Table
5.
5. If the display reading falls outside of the range shown in Table 5, the Meter does not
meet specification.
6. Set the Function Generator for the sine wave voltage and frequency called for in step
2 of Table 5 and compare the reading on the Meter display with the display reading
shown in Table 5.
Step
1 150 mV rms
2 150 mV rms

Testing the Frequency Sensitivity and Trigger Level

To verify the counter sensitivity and trigger levels for all frequency modes and ranges,
do the following. (For any function and range, the sensitivity and trigger level is the
same in both frequency and duty cycle modes.)
1. Connect the Calibrator to the
2. Put the Meter in the 4 V ac range, and press F.
3. Apply the input from step 1 of Table 6, and compare the reading on the Meter
display with the display reading in Table 6.
4. Put the Meter in the 4 V ac range, and press F.
5. Apply the input from step 2 of Table 6, and compare the reading on the Meter
display with the display reading in Table 6.
If the display reading falls outside of the range shown in Table 6, the Meter does not
meet specification.
6. On the Meter, press Kto enter the 40 V dc range.
7. Apply the input for step 3 and compare the reading on the Meter display with the
display reading in Table 6.
8. Repeat step 7 the remaining inputs shown in Table 6.
z
Note
Table 5. Frequency Test
Sine Wave Input
Voltage Frequency
z
and inputs on the Meter.
COM
Display Reading
19.000 kHz
190.00 kHz
and inputs on the Meter.
COM
Performance Tests
83/85/87
18.998 to 19.002
189.98 to 190.02
Multimeters
17