Fluke 53, 51, 54, 52 service manual Ice Bath Test

Thermometer

Performance Tests

4.Replace the Dewar Flask cap or cork, and insert the thermocouple wires and Mercury thermometer as shown in Figure 2. Insert the Mercury thermometer to the same depth as the thermocouple wire.

		K-Type Thermocouple wire
						K-Type
	Copper wire	Mercury	_		_	Thermocouple
						connector
		Thermometer
		-	+	-	+
		51, 52, 53, or 54
		Series II
		Thermometer
+	5700A	Ice bath
	Calibrator
-
						zb04f.eps

Figure 2. Ice Bath Test Equipment Connections

Ice Bath Test

Use the following procedure to test the thermometer. If the thermometer has two inputs, this test should be conducted on both thermocouple inputs.

1.If not already selected, select K-type thermocouple on the thermometer using the D, K, N, and E buttons.

2.Connect the equipment as shown in Figure 2. Allow the setup to thermally stabilize at least 5 minutes after inserting the thermocouple into the thermometer.

3.Verify that the ice bath temperature reads 0.0 oC ± 0.06 oC on the Mercury thermometer.

4.Short (or apply 0 mV) to the copper wires at the Calibrator.

5.Verify the thermometer reads 0.0 oC ± 0.3 oC.

6.If this test fails, reposition the thermocouple wires and Mercury thermometer to the same depth in the ice bath, and repeat steps 3-5. If the test continues to fail, perform the calibration procedure, located after this procedure.

7.Remove the short applied in step 4.

8.Using Table 3, steps 2-5, obtain an output from the Calibrator equal to the values in the “Input Voltage (mV DC)” column, and verify the thermometer reads within the limits specified. If any step fails, perform the calibration procedure located later in this section.

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

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