Fluke 2635A, 2625A Thermocouple Measurement Range Accuracy Test, Function Range Input Level

HYDRA

Service Manual

Table 4-2. Performance Tests (Voltage, Resistance, and Frequency) (cont)

FUNCTION	RANGE	INPUT
		LEVEL
	300Ω	short
	⎯	100Ω
	3 kΩ	short
	3 kΩ	1 kΩ
	30 kΩ	10 kΩ
	300 kΩ	100 kΩ
	3 MΩ	1 MΩ
	10 MΩ	10

* Optional test point if standards available.

FREQUENCY

DISPLAY ACCURACY

(1 Year, 18-28°C)

MINMAX

0.000.09

99.92100.15

0.00000.0003

0.99921.0009

9.99210.008

99.92100.08

0.99921.0008

9.98610.014

Note

All channels (0 through 20) can accommodate 2-terminal resistance measurements. Channel 0, with only two connections, cannot be used for 4- terminal measurements. Four-terminal resistance measurements can be defined for channels 1 through 10 only. Channels 11 through 20 are used, as required, for 4-terminal to provide the additional two connections. For example, a 4-terminal set up on channel 1 uses channels 1 and 11, each channel providing two connections.

Frequency

90 kHz

10 kHz/2V p-p

9.994

10.006

8.Connect a cable from the Output VA HI and LO of the 5700A to the Input Module test leads (observe proper polarity).

9.Select the VDC function and 300-volt range on Hydra and apply 0V dc from the 5700A. Then apply 290V dc input from the 5700A. Ensure the display reads between the minimum and maximum values as shown in Table 4-2 for the 0 and 290V dc input levels.

Note

Channels 0, 1, and 11 can accommodate a maximum input of 300V dc or ac. However, the maximum input for all other channels can only be 150V dc or ac.

10.With the exception of the selected voltage range and input voltagefrom the 5700A, repeat steps 1 through 9 for each remaining InputModule channel (2 through 20). Channels 2 through 10 and 12 through20 should be configured for the 150V dc range and an input voltageof 150 volts.

4-6. Thermocouple Measurement Range Accuracy Test

Verify that the Accuracy Verification Test for channel 0 meets minimum acceptable levels before performing this test.

Thermocouple temperature measurements are accomplished using the Hydra internal 100 mV and 1V dc ranges. (The ranges are not configurable by the operator.) This procedure provides the means to test these ranges.

Testing the 100 mV and 1V dc ranges requires computer interfacing with a host (terminal or computer). The host must send commands to select these ranges. These ranges cannot be selected from the Hydra front panel.

4-6