Fluke 2680A User Manual page 119

Using Fluke DAQ Software
3
Managing Your Network Using Fluke DAQ
The dialog box entries include:
Interval Trigger
Uses the interval timer (interval 1 timer) to set the scan rate for normal
operation in a module. The interval is user settable.
External Trigger
Uses the Trigger input signal to start a scan. Every time the external trigger is
activated, another scan is taken. If the Trigger In is held active low, scans are
taken at the interval set in Interval 2.
Alarm Trigger
Uses the second interval timer (Interval 2) to start scanning when an alarm
condition is encountered by the module. It continues scanning at Interval 2 as
long as any channel in the instrument that is configured as an alarm trigger is
in alarm.
There is also an interval timer (Interval 3) used to look for alarms during
longer intervals between scans. The default for the Interval 3 timer is 0.1 s for
the FAI and 1 s for the PAI. Interval 3 is set using the Advanced Settings
button on the Main Configuration dialog.
Reading Rate
Select the slow reading rate for high precision or the fast reading rate for high
speed. The medium rate allows resolution and speed between the slow and fast
reading rates. Actual reading speed depends on the function you select.
Drift Correction
Automatically selected when you set the reading rate to Slow (High Res.) or
Medium. You can click to clear the check box in fast reading rate only. Drift
correction is used primarily to compensate for temperature drift. Clearing the
check box allows fast scans to be taken slightly more quickly (about 1.5 ms).
To maintain the specified measurement accuracy it is recommended that you
DO NOT scan for long periods of time with drift correction off.
Conditional Scan Storage
Allows you to specify when to store scan data. Always is the default selection.
On Alarm stores scan data as long as an alarm condition exists. On Alarm
Transition stores scan data only when each alarm first occurs or ends. On
Alarm Transition usually stores the least amount of data.
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