Connecting Voltage Inputs To Rtd Channels - Data Translation DT9871 User Manual

Connecting Voltage Inputs to RTD Channels

Figure 18 shows how to connect a voltage input to an RTD channel on a DT9872 or DT9874
instrument.
Note: On the standard DT9874 instrument, channels 16 to 31 correspond to the RTD input
channels.
Figure 18: Connecting Voltage Inputs to an RTD Channel
The input impedance is well over 100 M using the voltage –Sense and +Sense inputs.
For best accuracy when connecting voltage inputs, use twisted-pair wires with a dead-ended
shield connected to pin 4 of the screw terminal block.
RTD Channel
– Sense +Sense
4 3 2
Vin – Vin +
1
Shield
Wiring Signals
53