Specifications
121 Signametrics
6.6 DC Current Test
The following procedure may be used to verify the accuracy of the DCI function:
1. If you have not done so, install the SMX2040 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 SMX2040 inputs. Select the DCI function, Autorange. Allow the SMX2040
to settle for a few seconds, and perform the Relative function.
3. Apply the following DC currents to the I,4Ω + & - terminals. Check to see that the displayed reading on the
SMX2040 is within the indicated readings range.
Table 9-7. DC Current Test
Step
Range Input Minimum Reading Maximum reading
1 3.3 mA 0 mA (open) -0.0004 mA 0.0004 mA
2 3.3 mA 1 mA 0.9986 mA 1.0014 mA
3 33 mA 0 mA (open) -0.003 mA 0.003 mA
4 33 mA 10 mA 9.987 mA 10.013 mA
5 330 mA 0 mA (open) -0.060 mA 0.060 mA
6 330 mA 100 mA 99.865 mA 100.135 mA
7 2.5 A 0 A -0.00035 A 0.00035 A
8 2.5 A 1 A 0.99315 A 1.00685 A
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 SMX2040 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 SMX2040 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
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