Performance Testing and Calibration

4

Performance Tests

6.The RTD Temperature Accuracy test is complete. However, if you desire to perform this test on any other channel (0 or 2 through 20), repeat steps 1 through 5, substituting the appropriate channel number.

Note

The only type of temperature measurement that can be made on channel 0 is 2-terminal RTD. Channels 11 through 20 support only 2-terminal RTDs.

Table 4-6. Performance Tests for RTD Temperature Function (DIN/IEC 751)

RTD Type

 

Temperature Accuracy Specifications

(DIN 43760 RTD)

 

1 Year @ 18-28°C

2-wire (channel 0)

 

-0.65°C to +0.70°C

4-wire

 

-0.65°C

(Assumes RTD R0 is set to 100.00Ω for each channel.)

 

4-13. Digital Input/Output Verification Tests

Digital Input/Output verification testing requires computer interfacing with a host (terminal or computer). The host must send commands to the instrument to control the digital lines for this test. Refer to Section 4 of the Hydra Users Manual for a description of configuring and operating the instrument.

4-14. Digital Output Test.

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

2.Switch OFF power to the instrument and disconnect all high voltage inputs.

3.Remove the ten-terminal Digital I/O connector from the rear of the instrument and all external connections to it. Connect short wires (to be used as test leads) to the ground (G) and 0 through 7 terminals. Leave the other wire ends unconnected at this time. Reinstall the connector.

4.Switch power ON to both Hydra and the host. Verify that Hydra is not scanning. If Hydra is scanning, press SCAN to turn scanning off, then cycle power off and on again.

5.Using a digital multimeter (DMM), verify that all digital outputs (0-7) are in the OFF or HIGH state. This is done by connecting the low or common of the multimeter to the ground test lead and the high of the multimeter to the digital output and verifying a voltage greater than +3.8V dc.

6.Using either a terminal or a computer running a terminal emulation program, set up Hydra to turn Digital Outputs ON (LOW state).

In sequence send the following commands to Hydra and measure that the correct Digital Output line measures less than +0.8V dc (LOW state.)

DO_LEVEL 0,0 <CR>

Verify that output 0 measures a LOW state. DO_LEVEL 1,0 <CR>

Verify that output 1 measures a LOW state. DO_LEVEL 2,0 <CR>

Verify output 2 measures a LOW state. Repeat the command for all eight outputs.

7.Set up Hydra to turn Digital Outputs OFF (HIGH state).

4-13

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Fluke 2625A, 2635A service manual Digital Input/Output Verification Tests, Digital Output Test

2635A, 2625A specifications

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