Measurement Computing eZ-NDT version 6.0.9 - Manual (Page 32)

4- 12 Windows and Menus 878493 eZ-NDT
Input Channels Tab
Cplg Selects AC or DC coupling.
mV/EU Use to set the instrument’s input sensitivity.
Typically, sensitivities are as follows:
•
Accelerometers: 100 mV per g
• Microphones: 25 mV per Pa
• Hammers: 1 mV per lbf.
Min Y
Min Y is used to set the instrument minimum in engineering units.
[Default: Force Units are lbf (pounds force) for modal hammers; G’s for
accelerometers; and Pa for microphones.]
Max Y Max Y is used to set the instrument maximum in engineering units
Units Used to identify the Engineering Units (EU) for the channel. The user is free to enter
whatever unit name he or she prefers. Typical units are: dB, lbf, Pa.
Trigger (%) Used to set the percentage value of the full scale voltage at which the force (hammer)
signal must reach before it is recognized as a trigger event.
Each trigger event results in a test inspection. For example, if the FSV for the
instrument is 1.000 V and the Trigger Percentage is 10%, eZ-NDT will trigger
acquisition when the Force Input is 0.100 V.
Delay (%) Used to define the start of the data block as a percentage of the block size from
minus 100% to plus 100 %.
A positive value will result in a Post Trigger. This is recommended for most
applications.
A negative value will result in a Pre-Trigger. For example, entering “-10” defines a
Pre-Trigger that is 10% of the block size. This means that 10% of the data block will
occur prior to the trigger event.