Fluke HART SCIENTIFIC 1502A - Manual (Page 34)

7.3.2.1 Selecting the Characterization
The following commands can be used to select the probe characterization and
coefficients:
P=90 selects the ITS-90 characterization
P=68 selects the IPTS-68 characterization
P=R or P=S selects the standard Callendar-Van Dusen
characterization
R0= sets R
0
or R(0.01C) depending on the selected charac-
terization
AL= sets
α for the Callendar-Van Dusen or IPTS-68 char-
acterization
DE= sets
δ for the Callendar-Van Dusen or IPTS-68 char-
acterization
BE= sets
β for the Callendar-Van Dusen characterization
A4= sets a
4
for the ITS-90 or IPTS-68 characterization
B4= sets b
4
for the ITS-90 characterization
C4= sets c
4
for the IPTS-68 characterization
An= sets a
6
, a
7
, a
8
, a
9
, a
10
, or a
11
for the ITS-90 character-
ization. n is a number from 6 to 11.
Bn= sets b
6
, b
7
, b
8
, or b
9
for the ITS-90 characterization. n
is a number from 6 to 9.
Cn= sets c
6
, or c
7
for the ITS-90 characterization. n is 6 or
7.
D6= sets d
6
for the ITS-90 characterization
SC=69 or SC=90 sets the temperature scale for the
IPTS-68 characterization
7.3.2.2 Testing the Characterization
The following command can be used to test the probe characterization:
CO= returns a temperature calculated from resistance
The 1502A will respond with a temperature value computed from the given re-
sistance value. The temperature is given in the currently selected unit. As an ex-
ample, if the Callendar-Van Dusen characterization is selected with IEC-751
coefficients and the selected unit is Celsius, sending this command with a resis-
tance value of 138.5 will return a temperature value of 100.0°C.
7.3.3 Sample Commands
The following commands ralate to the measurement process.
1502A Thermometer Readout
User’s Guide
30