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The coefficient C is only used for temperatures below 0°C. Only A and B coefficients are
needed for the range above 0°C, so coefficient C should be set to 0.
The R0 is the resistance of the probe at 0°C.
The ITS 90 coefficients for PT385, PT3926, and PT3616 are shown in Table 1.
RTD
Range (°C)
R0
Coefficient A
Coefficient B
Coefficient C
PT385
-200 to 0
100
3.9083 x 10-3
-5.775 x 10-7
-4.183 x 10-12
PT385
0 to 850
100
3.9083 x 10-3
-5.775 x 10-7
-
PT3926
Below 0
100
3.9848 x 10-3
-5.87 x 10-7
-4 x 10-12
PT3926
Above 0
100
3.9848 x 10-3
-5.87 x 10-7
-
PT3916
Below 0
100
3.9692 x 10-3
-5.8495 x 10-7
-4.2325 x 10-12
PT3916
Above 0
100
3.9692 x 10-3
-5.8495 x 10-7
-
6.10 Using Auto Output functions
The ASC-400 calibrator has two Auto Output functions:
Step
Ramp
6.10.1 Using the Step function
To use the Step function, follow the principle of navigating through the functions
described in the guidelines in section 4.2 and proceed as follows:
1. Select the desired lower mode from the Lower Mode list. Auto Output options are
not available for Pulse, Pressure and Baro modes.
2. Select “Out Step” from the Test Mode list.
Table 1
RTD Coefficients