Maintenance 6

Calibration

External Trigger Input Test

The External Trigger Input Test verifies that the rear panel trigger input of Hydra Series II is functioning properly.

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

2.Remove the Alarm Output eight terminal connector module from the rear of Hydra Series II and all external connections to it. Connect short wires (to be used as test leads) to the ground (J) and TR terminals. Leave other ends of wires unconnected at this time. Reinstall the connector. Refer to Figure 6-5.

 

 

ALARM OUTPUTS

DIGITAL I/O

+ – 0 1 2 3 TR

0 1 2 3 4 5 6 7 Σ

+

–

0

1 2 3 TR

 

9-16 V

 

+30V

!

 

 

 

DC PWR

 

 

oo22f.eps

Figure 6-5. External Trigger Test

3.Switch power ON.

4.On Hydra Series II, select the VDC function, 30V range for channels 0 through 5. Select a scan interval of 30 seconds.

5.Select trigger ON to enable the external trigger input. Press the SHIFT and MON(TRIGS) buttons (the display shows TRIG), then press either the up or down arrow buttons to display ON. Press ENTER.

6.Press Hydra Series II’s SCAN button. Hydra Series II should scan channels 0 through 5 once every 30 seconds.

7.During the interval when scanning is not occurring, connect (short) the test leads of the TR and ground Alarm Output terminals.

Ensure the connection causes a single scan to occur.

8.Disconnect (open) the TR and ground connection.

Ensure the scan continues to execute at its specified interval.

Calibration

Note

Refer to the Fluke Hydra Series II Service Manual (P/N 688868) for calibration procedures. The instrument must be stabilized in an environment with ambient temperature of 22 to 24ºC and relative humidity of less than 70% and have been turned on for at least 1/2 hour prior to calibration.

The instrument features closed-case calibration controlled over the Computer Interface. Using known reference sources, closed-case calibration has many advantages. There are

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Fluke 2620A, 2625A user manual External Trigger Input Test, 2 3 4 5 6 7 Σ
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2625A, 2620A specifications

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