Specifications

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,4Ω + & - 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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