Measurement Computing eZ-TOMAS rev.11.0 - Manual (Page 33)

eZ-TOMAS 947394 Edit Menu 4-5
Accelerometer and Velocity signals can be integrated. This column is used to select the
type of integration (none, single, or double). Points to note:
(1) If the signal is acceleration, then
(a) single integration results in velocity, and
(b) double integration results in displacement.
(2) If the signal is velocity, then single integration results in displacement.
Integration
(3) The integration value (g’s/ips/mils, g’s/ips/in, or g’s/mmps/mm) is selected in the
Acquisition Tab.
mV / EU is the instrument sensitivity. (Typical displacement probes: 200 milli-Volts per mil.
Typical accelerometer probes: 100 milliVolts per G. For Tach probes
enter 1000.) For static channels, this property represents the slope variable (m) of the
linear equation y = mx + b.
Offset Sets the offset factor that is to be applied to the Engineering Units.
FSV FSV (Full Scale Voltage) is the maximum input voltage for the instrument. If you are
unsure of the instrument’s maximum voltage value, select a high voltage value.
ICP A constant 4mA bias current is available for ICP transducers that are used as signal input
for ZonicBook/618E’s analog channels (CH1 through CH8) and for compatible expansion
modules that accept ICP transducers, for example, the WBK18. The bias current is
sourced through the center conductor of the input channel BNC connector and returns to
the acquisition device [e.g., ZonicBook/618E or the WBK18] via the BNC’s outer
conductor.
The current source features an operating compliance of 24V and is protected in regard to
both short-circuit and overvoltage. Operating compliance refers to the highest voltage
that can be applied without change of the current source value. In the absence of a
transducer, the current source will output an open circuit voltage of 30V. For applications
that do not require bias, the current source can be disconnected from the input by un-
checking ICP in the Input Channels tab on a per-channel basis.
When the ICP cell is checked for a channel, the current source is enabled, the input
voltage is continuously monitored with level detection circuitry. Recognition of a voltage
greater than 25V (transducer open) or less than 1V (transducer short) triggers a transducer
fault condition for the affected channel. This error is communicated to the user via a front
panel LED and is also available through a software status request at the end of an
acquisition. When recognized, an error is latched until the commencement of a new
acquisition. Consequently, even intermittent faults are detected and communicated.
Detection of a fault does not, however, alter the acquisition process or its data.
When the ICP function is not available to a channel a dash appears in the ICP column for
the associated channel.
Coupling AC or DC coupling can be set on an individual channel basis from the Input Channels tab.
Coupling is available for analog channels (CH1 through CH8) and for compatible
expansion channels [e.g., from a WBK18]. AC Coupling can be set to a high pass filter
value of 0.1 Hz or 1 Hz. The value is selected in the Edit Menu’s Acquisition Tab.
Note that when DC Coupling is selected the high pass filter is bypassed.
When the Coupling function is not available to a channel, or not used by a channel, a dash
appears in that channel’s Coupling column.
Angle Loc is the physical angular location of a probe. Zero degrees is defined to be the top dead
center. The angle value is measured in the counterclockwise (CCW) direction as viewed
from the driver end. Orbit and Polar displays utilize Instrument Angle for data correction.
1xA Ref and
1xP Ref 1x Amplitude Reference and 1x Phase Reference are the slow roll values used for Runout
Compensation on Bode or Polar displays.
Gap Volt is the DC voltage value when the shaft is at rest. This value is used for Shaft Center Line
displays.