Measurement Computing eZ-Analyst rev.14.1 - Manual (Page 50)

4-14 Edit Menu 978791 eZ-Analyst
Configuring Analog Input Channels
Input Channels Tab
No.
This column lists the available analog input channels; for example, channels 1
through 8.
Active Initially all input channels are active. To set unused channels to OFF, remove the
check from the associated “Active” checkbox.
Label This should be a meaningful name. Highlight a cell before typing a label. When
you press the key, the button, or the button the label is
accepted.
Ref /
Resp There are two types of channels, Reference and Response. All channels are
initialized as Response channels. If you are using a force channel, then (1)
highlight that channel’s Response/Reference cell, and (2) select Reference on the
resulting popup menu.
FS Full-Scale Voltage. The cells in this column are used to set the full-scale voltage
value in Volts.
IEPE
(Integral
Electronics
Piezoelectric)
The Institute of Environmental Science and Technology adopted the term IEPE
(Integral Electronics Piezoelectric) to identify what had been commonly referred
to as ICP
® (Integrated Circuit Piezoelectric). The two terms are synonymous;
however, ICP is registered by PCB Pizeotronics.
IEPE supportive analog channels have a 4mA bias current available for continuous
use by signal input transducers. Channels 1 through 8 on ZonicBook/618 and
channels 1 through 4 on IOtech 600 Series devices all support IEPE. The WBK18
is an example of an expansion module that can accept IEPE transducers.
Note: On 650 Series devices, analog input channel 5 has no IEPE support.
On 640 and 650 devices, only channels 1 through 4 have IEPE.
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, 640,
650, or 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 IEPE in the Input Channels tab on a per-channel basis.
Analog Input
Channels
(CH1 – CH8)
Tachometer
Channels
(T1 – T4)