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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 char-
acterization
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
A
n
=<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.
B
n
=<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.
C
n
=<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
example, if the Callendar-Van Dusen characterization is selected with IEC-751
coefficients and the selected unit is Celsius, sending this command with a re-
sistance 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.
7.3.3.1 Setting the Filter
The filter helps to reduce variations in the measurements. The filter can be set
remotely using the command:
FI=<value><EOS> sets the filter time constant
FI=0<EOS> disables the filter
The value is the filter time constant in seconds. It must be between 0 and 60
inclusive. A value of 0 disables the filter.
7.3.3.2 Setting the Probe Current
The probe excitation current can be set remotely using the commands:
30 Manual Rev. 952801 Hart Scientific
7 Digital Communications Interface
1.888.610.7664 sales@GlobalTestSupply.com
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