Input Calibration
140 UDC2500 Universal Digital Controller Product Manual 4/07
Type of Input Equipment Needed
RTD (Resistance
Thermometer
Device)
• A decade box, with at least ± 0.02 % accuracy, capable of providing
stepped resistance values over a minimum range of 0 to 1650 ohms
with a resolution of 0.001 ohm.
• Three insulated copper leads of equal length for connecting the
decade box to the controller.
Milliampere,
Millivolt, Volts, and
Radiamatic
• A calibrating device with at least ± 0.02 % accuracy for use as a
signal source.
• Two insulated copper leads for connecting the calibrator to the
controller.
• Place current source at zero before switching ON.
• Do not switch current sources OFF/ON while connected to the
UDC2500 input.
5.4 Input 1 Set Up Wiring
Thermocouple Inputs Using an Ice Bath
Refer to Figure 5-2 and wire the controller according to the procedure given in Table
5-4..
Table 5-4 Set Up Wiring Procedure for Thermocouple Inputs
Using an Ice Bath
Step Action
1
Connect the copper leads to the calibrator.
2
Connect a length of thermocouple extension wire to the end of each copper lead and
insert the junction points into the ice bath.
3
Connect the thermocouple extension wires to the terminals for Input #1.
See
Figure 5-2.
+
_
Millivolt
Source
26
27
+
Ice Bath
Copper Leads
Thermocouple
Extension Wire
_
+
_
Millivolt
Source
26
27
+
Ice Bath
Copper Leads
Thermocouple
Extension Wire
_
Figure 5-2 Wiring Connections for Thermocouple Inputs Using an Ice Bath
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