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2640A/2645A NetDAQ
Users Manual
2-10
1211 13 14 15 16 17 18 19 20
21 345678910
SOURCE
(4-WIRE)
SENSE
(4-WIRE)
H L H LH LH LH LH LH LH LH LH L
H L H LH LH LH LH LH LH LH LH L
2-WIRE (2W) CONNECTION
Resistance
or
RTD Source
Use H and L terminals for any channel.
• Channels 1 through 20 on rear panel input module (Channel 8 shown here).
1211 13 14 15 16 17 18 19 20
21 345678910
SOURCE
(4-WIRE)
SENSE
(4-WIRE)
H L H LH LH LH LH LH LH LH LH L
H L H LH LH LH LH LH LH LH LH L
4-WIRE (4W) CONNECTION
Use H and L terminals for two channels on rear panel input module. Connections for Channel 8 are
shown here with Channel 18 providing the additional two connections.
For each 4-wire connection, one Sense Channel (1 through 10) and one Source Channel (Sense
Channel number +10 = 11 through 20) are used.
Figure 2-4. 2-Wire and 4-Wire Connections