123
Signametrics
6.9 Frequency Counter Test (SMX2044 only)
The following procedure may be used to verify the accuracy of the Frequency Counter:
1. If you have not done so, install the DMM and place the covers back on to the computer. Ensure that the
computer has been on for at least one-half hour, with the covers on, before conducting this test.
2. Select the ACV function, autorange. Turn
freq
on.
3. Apply the following AC voltages to the
V,
Ω
+ & -
terminals. Check to see that the displayed reading on the
SMX2044 is within the indicated range of readings.
Table 9-9. ACV Frequency Counter Test
Step
Range
Input
Minimum Reading
Maximum reading
1
330 mV
33 mV, 40 Hz
39.9952 Hz
40.0048 Hz
2
3.3 V
330 mV, 40 Hz
39.9952 Hz
40.0048 Hz
3
33 V
3.3 V, 40 Hz
39.9952 Hz
40.0048 Hz
4
330 V
33 V, 40 Hz
39.9952 Hz
40.0048 Hz
5
330 mV
250 mV, 100 kHz
99.996 kHz
100.004 kHz
6
33 V
25 V, 100 kHz
99.996 kHz
100.004 kHz
2. Select the ACI function, autorange. Turn
freq
on.
3. Apply the following AC currents to the
I,4
Ω
+ & -
terminals. Check to see that the displayed reading on the
SMX2040 is within the indicated range of readings.
Table 9-10. ACI Frequency Counter Test
Step
Range
Input
Counter Reading
Tolerance
1
3.3 mA
330 uA, 40 Hz
2
33 mA
15 mA, 40 Hz
3
330 mA
150 mA, 40 Hz
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