Specifications
Signametrics 118
6.3 Resistance Test, 2-wire
The following procedure may be used to verify the accuracy of the 2-wire 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. Connect the SMX2040 V,Ω + & - terminals to the calibrator HI & LO Outputs. Output
0 Ω from the calibrator. Allow the SMX2040 to settle for a few seconds, and perform the Relative function. (This
effectively nulls out the lead resistance of your cabling. If you are using a Fluke 5700A or 5520A Calibrator, the
2-wire Compensation feature will give a more accurate 2-wire ohms measurement. See the Fluke Operator's
Manual for further instructions.)
3. Apply the following Resistance values to the V, Ω + & - terminals . Check to see that the displayed reading on
the SMX2040 is within the indicated range.
Table 9-3 Resistance Test, 2-wire
Step Range Input Minimum Reading Maximum Reading
1
33 Ω [1] 10 Ω 9.9972 Ω 10.0028 Ω
2
330 Ω 100 Ω 99.987 Ω 100.013 Ω
3
3.3 kΩ 1 kΩ 0.999917 kΩ 1.000083 kΩ
4
33 kΩ 10 kΩ 9.99905 kΩ 10.00095 kΩ
5
330 kΩ 100 kΩ 99.986 kΩ 100.014 kΩ
6
3.3 MΩ 1 MΩ 0.99942 MΩ 1.00058 MΩ
7
33 MΩ 10 MΩ 9.973 MΩ 10.027 MΩ
8
330 MΩ [1] 100 MΩ 97.92 MΩ 102.08 MΩ
[1] SMX2044 only
6.4 Resistance Test, 4-wire
The following procedure may be used to verify the accuracy of the 4-wire function.
1. If you have not done so, install the SMX2040 and place the covers back on to the chassis. Ensure that the
computer has been on for at least one-half hour, with the covers on, before conducting this test.
2. Connect the SMX2040 V,Ω + & - terminals to the calibrator HI & LO Output. Connect the SMX2040 I, 4WΩ
+ & - terminals to the HI & LO Sense terminals.
3. Select the 4WΩ function on the SMX2040, Autorange. Set the calibrator to 0 Ω. Be certain that the calibrator is
set to external sense ("EX SNS" on the Fluke 5700A or “4-Wire Comp” on the 5520A). Allow the SMX2040 to
settle for a few seconds, and perform the Relative function.
4. Apply the following Resistance values to the V, Ω + & - terminals. Check to see that the displayed reading on
the SMX2040 is within the indicated range.
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