Fluke 2620A, 2625A user manual Thermocouple Measurement Range Accuracy Test

Maintenance 6

Performance Tests

Table 6-3. Performance Tests (Voltage, Resistance, and Frequency) (cont)

Using inputs in decades of 1.9:

300 Ω	short
	190 Ω
3 kΩ	short
	1.9 kΩ
30 kΩ	19 kΩ
300 kΩ	190 kΩ
3 MΩ	1.9 MΩ

Using inputs in decades of 1:

0.00

189.93

0.0000

1.8992

18.992

189.91

1.8983

0.09

190.12

0.0003

1.9008

19.008

190.09

1.9017

300Ω

3kΩ

3kΩ

30 kΩ

300kΩ

3MΩ

10 MΩ*

short

100Ω

short

1 kΩ

10 kΩ

100kΩ

1mΩ

10 MΩ

0.00

99.95

0.0000

0.9995

9.995

99.94

0.9990

9.979

0.09

100.10

0.0003

1.0006

10.005

100.06

1.0010

10.021

*Optional test point if standards available.

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

Thermocouple Measurement Range Accuracy Test

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

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

To test 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 front panel of Hydra Series II.

1.Ensure that communication parameters ( i.e., transmission mode, baud rate, parity, and echo mode) on the Hydra Series II and the host are properly configured to send and receive serial data. Refer to Chapter 4.

2.Power up Hydra Series II and allow it to temperature stabilize for 1/2 hour.

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