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Measuring Temperature Using Thermocouples
(E1344A/47A Modules Only)
Example: Setup for
Measuring
Thermocouple
Temperature Using an
External Multimeter
Figure 3-6. Temperature Measurement on Channel 01 Using a Thermocouple
Chapter 3
•
Closing the AT and AT2 Tree Switches allows a multimeter connected
to the AT Tree Switch Terminals to measure the voltage of a
thermocouple or resistance of a thermistor connected to any channel.
•
Closing the RT and AT2 Tree Switches allows a multimeter connected
to the AT Tree Switch Terminals to measure the resistance of the
thermistor on the terminal module.
•
Use the thermistor resistance to calculate the temperature of the
terminal module to compensate thermocouple temperature
measurements (see "Comments" later in this section).
Figure 3-6 and the following commands show how to set up channel 01 of a
single module switchbox to measure temperature of a thermocouple using
an external multimeter. Execute:
CLOS (@192,193)
measure thermistor temperature
OPEN (@193)
CLOS (@101,190)
measure thermocouple voltage; calculate
compensated thermocouple voltage
192 and 193 close the AT2 and
RT tree switches.
Use multimeter.
Opens the RT Tree Switch.
Closes channel 01 and the AT
tree switch.
Use multimeter.
Using the Relay Multiplexer Modules
39
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