Fluke NetDAQ 2640A, Service Manual

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Performance Testing and Calibration
Performance Test
4
4-15
Four-Terminal Resistance Accuracy Test (2640A) 4-16.
Ensure that the Accuracy Tests (above) have been completed before performing this test
on the 2640A.
1. Connect the Resistance Source to Channels 1 and 11 Remove the Universal Input
Module from the instrument and connect a cable from the Decade Resistance Source
to the Universal Input Module terminals for channel 1 (Sense) and channel 11
(Source) as shown in Figure 4-3. Reinstall the Universal Input Module. You may
also use the 5700A resistance calibration output instead of the Decade Resistance
Source. Tables are provided for both connections. Refer to Figure 4-4 for the 5700A
four-wire connections.
2. Configure Channel 1 for Resistance In NetDAQ Logger for Windows, configure
channel 1 for Ohms-4T, 300 range.
3. Open Spy Window Select the Spy command from the Utilities menu. Select analog
channel 01. Click OK to open the Spy window.
12 11 13 14 15 16 17 18 19 20
2 1 3 4 5 6 7 8 9 10
SOURCE
(4-WIRE)
SENSE
(4-WIRE)
H L H L H L H L H L H L H L H L H L H L
H L H L H L H L H L H L H L H L H L H L
4-Wire (4T) Connection
Decade Resistance Box
or
DIN/IEC75/RTD
Input
Module
Figure 4-3. Four-Terminal Connections to the Universal Input Module (Resistor)