Keithley 2100 User Manual page 60

Section 4: Front Panel Operations
When 0°C < t < 630 °C:
When 0°C < t < 630 °C:
Where:
If you are using SPRTD (Standard Platinum RTD), select SPRTD and specify the seven
coefficients under SPRTD submenu.
The ITS (International Temperature Scale) -90 standard provides two reference equations for
Standard Platinum Thermometers covering temperature range from 18.8033K to 1234.93K.
However, one SPRTD usually cannot cover the entire range, so the temperature range is broken
up into a few subranges. These subranges depend on the calibration point of temperature scale
and are based on the melting or triple points of various pure substances. For an exact list of the
elements needed and details on RTD calibration, refer to NIST Technical Note 1265, "Guidelines
for Realizing the International Temperature Scale of 1990." In each subrange, the calibration
constants required for that subrange are listed.
Default
The default sensor type is PT100.
How to set up the RTD
You can set up the RTD configuration either through the front panel or the remote interface
operation.
To set up the RTD from the front panel:
1. If you are using an RTD, press CONFIG and then TEMP.
2. Use the PREV and NEXT keys to locate the SENSOR submenu and press ENTER to go to
the submenu.
3. Use the PREV and NEXT keys to locate your sensor type, then press ENTER to select your
desired sensor type.
• Choosing USER takes you to a menu where you can specify factors used in the calculation
equation to obtain the temperature. Use the PREV and NEXT keys to move through the
digits and the up and down arrow keys to change the numbers to the desired value. Press
ENTER to set the value.
• Choosing SPRTD takes you to a menu where you can specify the seven coefficients that
are used to determine the temperature. Use the PREV and NEXT keys to move through the
digits and the up and down arrow keys to change the numbers to a desired value. Press
ENTER to set the value.
To set up the RTD from a remote interface:
Use the following commands to set up the RTD configuration:
4-12
Model 2100 6 1/2-Digit Resolution Digital Multimeter User's Manual
(
R = R 1+At+Bt
t 0
(
R = R 1+At+Bt
t 0

( )
A = 
1+
100
-4
B = - • 10
-8
B = - • 10
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2 )
2 )
2100-900-01 Rev. D / September 2011