CoCo-80 User Manual
71
Hardware
CoCo-80 Input Connections
This section describes the CoCo-80 input connections and the related circuit
design including a description of AC/DC-Single End, AC/DC-Differential, and
IEPE input modes.
Figure 97: CoCo-80 IO connection panel
System Calibration
The CoCo loads factory calibration data during start-up, eliminating the need for
daily calibration checks. Although the CoCo does not require daily field
calibration, CI recommends an annual calibration and performance verification
by local CI service centers.
To execute the System Calibration, first press the Setup hard button, then select
System Calibration icon and press Enter.
Input Modes
DC-Differential
DC-Differential measures signals with a DC component. It uses a differential
input mode to ignore the DC component and just measure the fluctuations (AC
component) of the signal.
Differential mode is recommended when measuring signals with a common mode
voltage (CMV). CMV is an in-phase signal that appears simultaneously on
multiple input channels. If the sum of the signal and the CMV do not saturate the
input and cause clipping, the measurement will be accurate. If the signal and
CMV exceed the input range then the signal will be clipped and produce
erroneous results. If the signal and CMV are very high and exceeds the maximum
over-voltage rating of the instrument front end then the data will be erroneous
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