Fluke 50S, 50D warranty Ice Bath Test

50S & 50D Thermometer

Calibration Information

50S or 50D	Thermocouple wire
Thermometer	+
	_
	Ice bath
	5520A
	Copper wire
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Figure 4. Ice Bath Equipment Connections

Ice Bath Test

Use the following procedure to test the thermometer. This test should be conducted on both thermocouple inputs of the 50D.

1.Connect the equipment as shown in Figure 4.

2.Insert the Mercury Thermometer to the same depth as the thermocouple wires and verify that the ice bath temperature is 0.0 oC ± 0.1 oC.

3.Short (or apply 0 mV) to the copper wires at the 5520A Calibrator.

4.Verify the thermometer reads 0.0 oC ± 0.4 oC.

5.If this test fails, reposition the thermocouple wires and Mercury Thermometer in the ice bath and repeat steps 2-4. If the test continues to fail, perform the calibration procedure, located later in this document.

6.Remove the short applied in step 3.

7.Using Table 3 (for the corresponding thermocouple type), obtain an output from the 5520A equal to the first value of the “Input Voltage (mV DC)” column, and verify that the thermometer reads within the limits specified.

8.Repeat these steps for the remaining voltages in the “Input Voltage (mV DC)” column.

9.Disconnect the thermocouple from the input terminals. This completes the ice bath test.

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