Fluke NetDAQ 2640A, Service Manual

Page: 146 / 260

NetDAQ
Service Manual
4-24
Trigger Input Test 4-28.
This test checks the ability of the Trigger Input line to trigger measurement scanning.
1. Configure Trigger Input In NetDAQ Logger for Windows, configure the scan
parameters for External Trigger with an Interval 2 of 1 second. Be sure Interval
Trigger is not enabled.
2. Verify Configuration Channel 1 for Volts DC In NetDAQ Logger for Windows,
verify channel 1 is configured for Volts dc, 3V range.
3. Start Instrument Scanning Click the Start Instrument button on the Button Bar to
enable instrument scanning, although no measurement scanning takes place because
the external Trigger Input is not set.
4. Open Logging Status Window Select the Show Logging Status command from the
Options menu to display the Logging Status window.
5. Verify Logging Status Note in the Logging Status window that the Retrieved Scans
count is zero and not incrementing.
6. Set Trigger Input While monitoring the Logging Status window, connect the TI
(Trigger Input) test lead to the GND test lead. Note in the Logging Status window,
the Retrieved Scans count increments at 1-second intervals. Disconnect the TI and
GND test lead connection.
7. Stop Scanning Click the Stop Instrument button on the Button Bar to stop
instrument scanning.
Trigger Output Test 4-29.
This test checks the Trigger Output (125µs logic low) that occurs each time the
instrument scans.
1. Configure Interval Trigger In NetDAQ Logger for Windows, configure the scan
parameters for Interval Trigger with an Interval 1 of 1 second.
2. Verify Configuration Channel 1 for Volts DC In NetDAQ Logger for Windows,
verify channel 1 is configured for Volts dc, 3V range.
3. Measure Unset Trigger Output Line Using a digital multimeter, measure the
output of the unset TO test lead, referenced to the GND test lead, for a voltage
greater than +3.8V dc.
4. Verify Trigger Output is Enabled In NetDAQ Logger for Windows, click the
Instrument Config button on the Button Bar. In the Instrument Configuration dialog
box, verify the Trigger Out box is checked. Click OK to return to the Main Window.
5. Connect Trigger Output Connect the TO test lead on the ALARM/TRIGGER IO
connector to the
Σ
(Totalizer) test lead on the DIGITAL I/O connector. This allows
each Trigger Output pulse to be counted by the Totalizer.
6. Start Instrument Scanning Click the Start Instrument button on the Button Bar to
enable instrument scanning.
7. Open Spy Window Select the Spy command from the Utilities menu. Select
01TOTAL. Click OK to open the Spy window.