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7.3.2.1 Selecting the Characterization
The following commands can be used to select the probe characterization and
coefficients:
P=90<EOS> selects the ITS-90 characterization
P=68<EOS> selects the IPTS-68 characterization
P=R<EOS> or P=S<EOS> selects the standard Callendar-Van Dusen
characterization
R0=<value><EOS> sets R
0
or R(0.01C) depending on the selected charac
-
terization
AL=<value><EOS> sets α for the Callendar-Van Dusen or IPTS-68 char
-
acterization
DE=<value><EOS> sets δ for the Callendar-Van Dusen or IPTS-68 char
-
acterization
BE=<value><EOS> sets β for the Callendar-Van Dusen characterization
A4=<value><EOS> sets a
4
for the ITS-90 or IPTS-68 characterization
B4=<value><EOS> sets b
4
for the ITS-90 characterization
C4=<value><EOS> sets c
4
for the IPTS-68 characterization
An=<value><EOS> 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=<value><EOS> sets b
6
, b
7
, b
8
, or b
9
for the ITS-90 characterization. n
is a number from 6 to 9.
Cn=<value><EOS> sets c
6
, or c
7
for the ITS-90 characterization. n is 6 or
7.
D6=<value><EOS> sets d
6
for the ITS-90 characterization
SC=69<EOS> or SC=90<EOS> 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=<value><EOS> 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