Digital Input Test, Totalizer Test, Terminal Grounded

HYDRA

Service Manual

Send the following commands to Hydra in sequence, and measure that the correct Digital Output line measures greater than +3.8V dc (HIGH state.)

DO_LEVEL 0,1 <CR>

Verify that output 0 measures a HIGH state.

DO_LEVEL 1,1 <CR>

Verify that output 1 measures a HIGH state.

Repeat the command for all eight outputs.

4-15. Digital Input Test

1.Perform the DIGITAL OUTPUT TEST steps 1 through 5.

2.Using either a terminal or a computer running a terminal emulation program, read the Hydra Digital Input lines.

Send the following command to Hydra: DIO_LEVELS? <CR>

Verify that the returned value is 255.

Note

The number returned is the decimal equivalent of the Digital Input binary word (status of inputs 0 through 7). See Table 4-7 to determine if the number returned corresponds to the inputs jumpered to ground in this test.

3.Jumper input 0 to ground by connecting the ground test lead to the input 0 test lead. Then send the following command to Hydra:

DIO_LEVELS? <CR>

Verify that the returned value is 254.

4.Disconnect input 0 from ground, then jumper input 1 to ground. Send the command: DIO_LEVELS? <CR>

Verify that the returned value is 253.

5.Repeat step 4 for each input and verify the correct returned value (See Table 4-7).

Terminal Grounded

none

Table 4-7. Digital Input Values

State of Digital Inputs

Inputs 0-7, all HIGH

Inputs 1-7 HIGH, input 0 LOW Inputs 0,2-7 HIGH, input 1 LOW Inputs 0-1 and 3-7 HIGH, input 2 LOW Inputs 0-2 and 4-7 HIGH, input 3 LOW Inputs 0-3 and 5-7 HIGH, input 4 LOW Inputs 0-4 and 6-7 HIGH, input 5 LOW Inputs 0-5 and 7 HIGH, input 6 LOW Inputs 0-6 HIGH, input 7 LOW

Decimal Value

255

254

253

251

247

239

223

191

127

4-16. Totalizer Test

This totalizer verification test requires toggling Digital Output line 0 and using it as the Totalizer input. The test requires computer interfacing with a host (terminal or

4-14

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Fluke 2635A, 2625A Digital Input Test, Totalizer Test, Terminal Grounded, Decimal Value

Models: 2635A 2625A