Product Manual

Primary Inputs and Outputs
Resistance Temperature Detector (RTD) and Ohms Measure 2
2-5
Resistance Temperature Detector (RTD) and Ohms Measure
The Product can measure all common RTD types, 5 custom RTD curves, and a custom
SPRT in °F or °C, plus basic resistance from 0 Ω to 4000 Ω. The Product uses these
common RTD types:
• Pt 385 100 Ω, 200 Ω, 500 Ω, 1000 Ω
• Pt 3926 100 Ω
• Pt 3916 (JIS) 100 Ω
• Ni120 120 Ω
• Cu 427 (Minco) 10 Ω
• YSI 400
Disconnect test leads from external devices.
1. Push  to select thermocouple and RTD/Ω mode, if not already selected. If
thermocouple mode is shown, push the key again to go to RTD/Ω mode.
2. If output mode is shown, push  and  to select input mode.
3. Push  to select the necessary RTD type, the custom curve, the SPRT, or the
necessary ohms range. The setup and use of custom RTD coefficients is given in the
“Resistance Temperature Detector (RTD) with Custom Coefficients” section of this
chapter. The set up and use of SPRT coefficients is given in the “Standard Platinum
Resistance Thermometer (SPRT) Coefficients” section of this chapter.
4. Connect the UUT to the 4-wire RTD/Ω input terminals of the Product as shown in
Figure 2-3.
CURRENT
OUTPUT
HI
VOLTS
mA
RTD/
OUTPUT
HI
LO
HI
LO
LO
TC
SENSE
INPUT/OUTPUT
4 W RTD/
INPUT
100 V PK
MAX
100V MAX
100mA MAX
20V PK
MAX
20V PK
MAX
PRECISION PROCESS CALIBRATOR
7526A
Unit Under Test (UUT)
RTD/Ω Output
+
-
gwp012.eps
Figure 2-3. RTD/Ω Input Connection
5. Push  and  to toggle the RTD display between °F and °C.
6. For best accuracy, it is recommended to zero the RTD resistance circuit(s) daily, or if
you will use the Product out of the ambient temperature range of 18 °C to 28 °C. The
maximum offset from unit calibration that can be zeroed out is ±0.1 Ω for the high
range and ±0.01 Ω for the low range.