Measurement Computing eZ-TOMAS version 7.1.x - Manual (Page 39)

eZ-TOMAS & eZ-TOMAS Remote 887591 Edit Menu 3-13
User Snapshot Used to specify the duration of continuous data gathering (in seconds) for a snapshot
of data. When the snapshot button is clicked [the button with the camera image], data
will be collected for the specified duration.
The history file is a FIFO file. You can define the depth of the history file; however, the amount of time
needed to fill the file depends on the trigger event values. The smaller the trigger values, the faster the
history file fills. The current data storage status is shown in the Main Window.
Example
Assume that a motor typically runs at 3600 RPM and we would like to store data when the motor is running
above 200 RPM and below 5000 RPM.
1. Open the Edit menu.
2. Select “Setup.” The Setup Configuration window will open.
3. Select “Storage Tab.”
4. For RPM Range enter a value of 5000 for the maximum and 200 for the minimum.
5. Set one or more of the following to trigger data storage:
a) Time Change
b) RPM Change
c) Overall Change (the overall change in engineering units)
For this example assume that Time Change and RPM Change were both set to “None” and the
Overall Change trigger for a channel was set to set to 0.25 mils.
6. Click .
With this configuration, data will be stored if . . . the motor’s speed is greater than 200 RPM and less
than 5000 RPM and the overall value changes by 0.25 mils [since the last trigger event]. In this case
eZ-TOMAS will store time waveform and spectral gauge (band) data for all channels. All event triggers
are reset whenever any event trigger occurs.
In other words:
IF minRPM < Motor Speed < maxRPM
AND IF {delta Time, OR delta Speed, OR delta EU = specified setting}
THEN data is stored.