Measurement Computing eZ-TOMAS version 7.1.x - Manual (Page 30)

eZ-TOMAS & eZ-TOMAS Remote 887591 Edit Menu 3-4
Note: Filter Panel options apply to ZonicBook/618E and WBK18 channels.
High Pass AC Coupling Filter (Hz)
High Pass AC Coupling Filter: When AC Coupling is selected in
the Input Channels tab, the associated input signals will pass
through a 0.1 Hz or a 1.0 Hz High Pass Filter, depending on which
radio button is selected.
IEPE Delay Time - The typical IEPE charge time for a 0.1 Hz AC
coupling filter is 40 to 60 seconds, and 4 to 6 seconds for a 1.0 Hz
AC coupling filter. While the IEPE is charging, you will see large DC
offsets in the acquired data.
For this reason you may want to enter an IEPE Charge delay time.
eZ-TOMAS will pause data acquisition and storage for the indicated
time period.
Acceleration – Velocity – Displacement Preferences
Accelerometer and Velocity signals can be integrated. Select the
desired integration units from the Engineering Units pull-down list.
The High Pass Display Filter applies to the frequency displays and
calculations, such as the Overall Vibration Level. The filter values
(Hz) can be defined for each integration type. Frequency data below
the set filter value is zeroed. This is useful when you want to remove
the “Ski-Slope” effect of integration.
Important
For related information, see INT/DIFF on page 3-
: Make sure the Filter Value is lower than the Machine
running speed, by at least 50%.
Example: For a running speed of 1200 RPM we would need to
set the filter value to 10 Hz or lower. Calculated as follows:
0.5(1200
rev
/ 60
sec
) = 0.5(20
rev
/
sec
) = 10Hz
7.
Scale Preferences
The instrument scale preferences can be defined for Acceleration,
Velocity, and Displacement input types.
You can select one of the following for each of the three instrument
types:
RMS
Peak (PK)
Peak-to-Peak (P-P)