Totalizer Sensitivity Test; Master Alarm Output Test - Fluke 2640A Service Manual

Totalizer Sensitivity Test

This test checks the ability of the Totalizer feature to count voltage transition at a
particular sensitivity level.
1. Connect Test Leads At the DIGITAL I/O connector, connect the Σ (Totalizer) test
lead and GND test lead to a signal generator's output terminals. Adjust the signal
generator for an output of 1.5V rms sine wave at 10 Hz.
2. Start Instrument Scanning Click the Start Instrument button on the Button Bar to
start instrument scanning. Scanning is initiated to enable the return of TOTAL status
to the Spy window.
3. Open Spy Window Select the Spy command from the Utilities menu. Select
01TOTAL. Click OK to open the Spy window.
4. Verify Totalizer Count The Spy window summarizes the Totalizer count. Verify
the totalizer count is advancing at approximately 10 Hz per Spy window update
(nominal 1 second intervals).
5. Close Spy Window To close the Spy window, double-click the upper left-hand
corner control-menu box.
6. Stop Scanning Click the Stop Instrument button on the Button Bar to stop
instrument scanning.

Master Alarm Output Test

This test checks the Master Alarm output for a logic low when a channel is in alarm.
1. Connect Test Leads to ALARM/TRIGGER I/O Connector Remove the
8-position ALARM/TRIGGER I/O connector from the instrument rear panel.
Connect a test lead to each line, MA (Master Alarm), TO (Trigger Output), TI
(Trigger Input), plus a test lead to the GND line. Reinstall the connector.
2. Measure Unset MA Line Using a digital multimeter, measure the output of the
unset MA test lead, referenced to the GND test lead, for a voltage greater than +3.8V
dc.
3. Verify Configuration Channel 1 for Volts DC In NetDAQ Logger for Windows,
verify channel 1 is configured for Volts dc, 3V range.
4. Verify Configuration Channel 1 for Alarms In NetDAQ Logger for Windows,
verify channel 1 is configured for an Alarm 1 with Alarm Sense=LO, Alarm
Value=1 and Digital Output=DO0.
5. Start Instrument Scanning Click the Start Instrument button on the Button Bar to
start instrument scanning. Scanning is initiated to enable the Master Alarm output.
6. Measure Set MA Line Using a digital multimeter, measure the output of the set
MA test lead, referenced to the GND test lead, for a voltage less than +0.8V dc.
7. Stop Scanning Click the Stop Instrument button on the Button Bar to stop
instrument scanning.
Performance Testing and Calibration
Performance Test
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