Agilent Technologies E1345A Manuel d'utilisateur télécharger pdf (Page 38)

Using the Relay Multiplexer Modules 39Chapter 3

Measuring Temperature Using Thermocouples

(E1344A/47A Modules Only)

• 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).

Example: Setup for

Measuring

Thermocouple

Temperature Using an

External Multimeter

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)

192 and 193 close the AT2 and

RT tree switches.

measure thermistor temperature

Use multimeter.

OPEN (@193)

Opens the RT Tree Switch.

CLOS (@101,190)

Closes channel 01 and the AT

tree switch.

measure thermocouple voltage; calculate

compensated thermocouple voltage Use multimeter.

Figure 3-6. Temperature Measurement on Channel 01 Using a Thermocouple

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Agilent Technologies E1345A Manuel d'utilisateur Page 38