Product Manual

7526A
Users Manual
2-6
To zero a RTD resistance circuit:
• Select the RTD measure function as in the “Resistance Temperature Detector (RTD)
and Ohms Measure” and “Resistance Temperature Detector (RTD) and Ohms
Source” sections of this chapter and push  until the low or high ohms range is
selected.
• Short the RTD/Ω terminals with the test leads normally used for RTD/Ω
measurements.
• It is necessary for the test leads and terminals to stabilize to the same temperature.
They are stable in approximately 3 minutes.
• Push  and  to zero the ohms range.
Resistance Temperature Detector (RTD) and Ohms Source
The Product can source all common RTD types and 5 custom RTD curves in °F or °C,
plus basic resistance from 5 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
1. Disconnect test leads from external devices.
2. 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.
3. If input mode is shown, push  and  to select output.
4. Push  to select the necessary RTD curve or ohms range. The set up and use of
custom RTD coefficients is given in the “Resistance Temperature Detector (RTD)
with Custom Coefficients” section of this chapter.
5. Connect the UUT to the RTD/Ω output terminals of the Product as shown in
Figure 2-4.
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 Input
+
-
+
-
HI
gwp013.eps
Figure 2-4. RTD/Ω Output Connection