Keithley 2001-TCSCAN - 3.8 Temperature Measurements

Operation
3-11
3.8 Temperature measurements
The following paragraphs discuss using the Model 2001-
TCSCAN for making temperature measurements using
thermocouples and RTD probes.
3.8.1 Thermocouple temperature measurements
The Model 2001-TCSCAN can be used to make temperature
measurements with the following thermocouple types: J, K,
T, E, R, S, B. Measurements can be made either by automatic
scanning, or by manually closing specific channels. The fol-
lowing paragraphs outline the procedures for making ther-
mocouple temperature measurements using both of these
methods. For more detailed information on temperature
measurements in general, refer to the Model 2001/2002 Op-
erator’s manual.
■ Thermocouple scanning
Follow the steps below to automatically scan through ther-
mocouples and make temperature measurements.
Step 1: Connect thermocouples
Connect your thermocouples to the scanner input connectors
using the general scheme shown in Figure 2-5 in Section 2.
Step 2: Select thermocouple type and reference junction
parameters
1. From normal display, press CONFIG-TEMP. The in-
strument will display the following:
CONFIG TEMPERATURE
SENSOR UNITS SPEED FILTER RESLN
2. Select SENSOR, then press ENTER. The following will
be displayed:
TEMP SENSOR TYPE
4-WIRE-RTD RTD THERMOCOUPLE
3. Select THERMOCOUPLE, then press ENTER. The
Model 2001 will then display the thermocouple setup
menu:
THERMOCOUPLE SETUP
THERMOCOUPLE-TYPE REF-JUNCTIONS
4. Choose THERMOCOUPLE-TYPE, then press ENTER.
The list of supported thermocouple types will be dis-
played:
THERMOCOUPLE TYPE
JKTERSB
5. Select the thermocouple type to match those you are us-
ing, then press ENTER. Select REF-JUNCTIONS on
the displayed menu, then press ENTER. The Model
2001 will display the following:
CONFIGURE REFJCNS
JCN1 JCN2 JCN3 JCN4 JCN5
6. Select the desired reference junction (for example,
JCN1), then press ENTER. The instrument will display
the following message:
REFERENCE JUNCTION#1
CONFIGURE ACQUIRE-REF-TEMP
7. Select CONFIGURE, then press ENTER. The following
will be displayed:
CONFIGURE REFJCN#1
SIMULATED-TEMP REAL-JUNCTION
8. Select REAL-JUNCTION, then press ENTER. The in-
strument will prompt you to enter the reference junction
coefficient:
REFJCN#1=+00.20mV/°C
9. If necessary, set the displayed value to +200µV/°C
(+0.20mV/°C), then press ENTER. The unit will then
prompt you for the reference offset:
OFFSET1=+54.63mV@0°C
10. If necessary, set the offset to +54.63mV @ 0°C, then
press ENTER.
11. Press EXIT as necessary to return to the CONFIG TEM-
PERATURE menu, then select your UNITS, SPEED,
FILTER, and RESLN, as required.
12. Press EXIT to return to normal display.