Fluke 2635A Totalizer Test, Terminal Grounded, Digital Input Values, State of Digital Inputs

Maintenance 7

Performance Tests

Send the command: DIO_LEVELS? <CR>

Verify the returned value is 253.

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

TERMINAL GROUNDED

none

0

1

2

3

4

5

6

7

Table 7-7. 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

Totalizer Test

This totalizer verification test requires toggling the Digital Output line 0 and using it as the Total input. The test requires computer interfacing with a host (terminal or computer). The host must send commands to the 2635A instrument to control the digital line for this test. Refer to Chapter 4 for a description of configuring and operating Hydra Series II.

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

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

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

4.Switch ON power to both Hydra Series II and the host.

5.Press the Obutton on the front panel of Hydra Series II.

Ensure that Hydra Series II displays a 0 value.

6.Jumper the DIGITAL I/O terminal 0 to the Total (SUM) input by connecting the (SUM) terminal test lead to DIGITAL I/O 0’s test lead.

7.Using either a terminal or a computer running a terminal emulation program, set up Hydra Series II to toggle (turn ON and OFF) Digital Output 0.

In sequence send the following commands to Hydra Series II and ensure that Hydra Series II measures and displays the correct total value:

DO_LEVEL 0,0 <CR> DO_LEVEL 0,1 <CR>

Ensure that Hydra Series II displays a totalizer count of 1.

7-17