Rtd Temperature Measurements - Keithley 2001-TCSCAN Instruction Manual

9. Choose JCN1, then press ENTER. The selection menu
below will be displayed:
REFERENCE JUNCTION#1
CONFIGURE ACQUIRE-REF-TEMP
10. Select ACQUIRE-REF-TEMP, then press ENTER. The
reference junction temperature has now been acquired.
11. Press EXIT as necessary to return to the CONFIG TEM-
PERATURE menu, then select the UNITS, SPEED,
FILTER, and RESLN, as required.
12. Press EXIT to return to normal display after completing
temperature configuration.
Step 3: Close channels and display temperature
Close the desired channel (2-10) to display the temperature
for that channel. Use the CHAN key and CLOSE-CHAN-
NEL menu selection to close a specific channel. Once a
channel is closed, you can manually scan through channels
using the and keys. Keep in mind that the reference
junction temperature should be acquired often to assure mea-
surement accuracy, especially if the ambient temperature
changes. Remember that the TEMP function must be select-
ed, and channel 1 must be closed to acquire the reference
junction temperature.
3.8.2

RTD temperature measurements

The following paragraphs outline the procedures for making
temperature measurements from the front panel using the
scanner. For more detailed information on temperature mea-
surements in general, refer to the Model 2001/2002 Opera-
tor's manual.
Step 1: Connect RTD probes
Connect RTD probes to the scanner using the basic
resistance connections outlined in Section 2. For 4-wire
probes, pair the connections as follows:
• Channels 2 and 7: probe #1
• Channels 3 and 8: probe #2
• Channels 4 and 9: probe #3
• Channels 5 and 10: probe #4
Do not use channels 5 and 10 for 2-wire probes because of
the higher path resistance of these channels.
Step 2: Select sensor type and units
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
RTD 4-WIRE-RTD THERMOCOUPLE
3. Select RTD or 4-WIRE-RTD as appropriate for the sen-
sor type you are using, then press ENTER. The instru-
ment will display the following:
SET RTD TYPE
PT385 PT3916 USER-RTD
4. Select the RTD type from among the displayed types,
then press ENTER.
5. Select UNITS, then press ENTER. The unit will display
the following selections:
SET TEMP UNITS
DEG-C DEG-F K
6. Choose the type of temperature units you desire to use:
°C, °F, or K, then press ENTER.
7. Before exiting the temperature configuration menu, se-
lect speed, filter, and resolution operating modes, if de-
sired.
8. Press EXIT to return to normal display.
Step 3: Configure channels
1. Press CONFIG-CHAN. The instrument will display the
following:
CONFIGURE CHANNELS
INTERNAL-CHANS EXTERNAL-INPUTS
Operation
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