2640A/2645A NetDAQ

Users Manual

Thermocouple Temperature Accuracy Test

6-15.

Ensure that the Accuracy Tests (above) have been completed before performing this test.

1.Connect a Thermocouple Remove the Universal Input Module from the instrument and connect the supplied type T thermocouple to the channel 1 terminals with the blue lead to the H terminal and red lead to the L terminal. Reinstall the Universal Input Module.

2.Configure Channel 1 for Thermocouples In NetDAQ Logger, configure channel 1 for Thermocouples with Range (thermocouple type) T. (See “Configuring Analog Channel Functions" in Chapter 3 of this manual.)

3.Open Spy Window Select the Spy command from the Utilities menu. Select analog channel 01. Click OK to open the Spy window.

4.Verify Accuracy Insert the thermocouple and a mercury thermometer in a room-temperature bath. Allow 20 minutes for thermal stabilization. The value

displayed on the mercury thermometer should equal the value in the Spy Window + 0.5°C (2640A) or + 0.95°C (2645A) plus any sensor inaccuracies.

5.Close Spy Window.

Open Thermocouple Response Test

6-16.

This test checks the Open Thermocouple response.

1.Connect an 820 Ohm Test Resistor Remove the Universal Input Module from the instrument and connect an 820 ohm resistor to the channel 1 terminals. Reinstall the Universal Input Module.

2.Configure Channel 1 for Thermocouples In NetDAQ Logger, configure channel 1 for Thermocouples with Range (thermocouple type) K. (See “Configuring Analog Channel Functions" in Chapter 3 of this manual.)

3.Open Spy Window Select the Spy command from the Utilities menu. Select analog channel 1. Click OK to open the Spy window. The value displayed should approximate the ambient temperature.

4.Connect a 10k Ohm Test Resistor Remove the Universal Input Module from the instrument and connect a 10k ohm resistor to the channel 1 terminals to simulate an open thermocouple condition. Reinstall the Universal Input Module.

5.Verify Open Thermocouple The Spy window indicates an open thermocouple detect condition by displaying Open TC in place of a temperature reading.

6.Close Spy Window.

6-16

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Fluke 2645A, 2640A user manual Thermocouple Temperature Accuracy Test, Open Thermocouple Response Test

2645A, 2640A specifications

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