Operator`s manual

Signametrics 118
6.7 AC Current Test
The following procedure may be used to verify the accuracy of the ACI function:
1. If you have not done so, install the SM2040 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. Remove all connections from the SM2040 inputs. Select the ACI function, Autorange.
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 readings range.
Table 9-8. AC Current Test
All Inputs are at 400Hz
Step Range Input Minimum Reading Maximum reading
1 3.3 mA 0.1 mA 0.09588 mA 0.100412 mA
2 3.3 mA 1 mA 0.9948 mA 1.0052 mA
3 33 mA 1 mA 0.9684 mA 1.0316 mA
4 33 mA 10 mA 9.954 mA 10.046 mA
5 330 mA 10 mA 9.758 mA 10.242 mA
6 330 mA 100 mA 99.56 mA 100.44 mA
7 2.5 A 100 mA 0.09535 A 0.10465 A
8 2.5 A 1 A 0.9895 A 1.0105 A
6.8 Capacitance Test (SM2042, SM2044 only)
The following procedure may be used to verify the accuracy of the Capacitance function.
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. Connect the DMM V,Ω + & - terminals to the calibrator HI & LO Outputs. Attach the test leads to the DMM,
leaving the other end open circuited. Allow the DMM to settle for a few seconds, and perform the Relative
function. (This effectively nulls out the lead capacitance of your cabling.
3. Apply the following Capacitance values to the V, Ω + & - terminals. Check to see that the displayed reading on
the SM2042/44 is within the indicated range of readings.
Step Range Input Minimum Reading Maximum reading
1
10 ηF 10 ηF
9.785 ηF
10.215 ηF
2
100 ηF 100 ηF
99 ηF 101 ηF
3
1 µF 1 µF
0.99 µF
1.01 µF
4
10 µF 10 µF
9.9 µF 10.1 µF
5
100 µF 100 µF
99 µF 101 µF
6
1 mF 1 mF
0.988 mF 1.012 mF
7
10 mF 10 mF
9.8 mF 10.2 mF
6.9 Frequency Counter Test (SM2042, SM2044 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.