Measurement Computing PC104-DAS08 - Manual (Page 11)

Figure 2-3. BP40-37 Adapter Cabling
2.2 ANALOG INPUTS
Analog inputs to the PC104-DAS08 are single-ended.
CAUTION - PLEASE READ
Measure the voltage between signal ground at the signal source
and the PC’s ground. If the voltage exceeds 0.5V (AC or DC), DO
NOT CONNECT the PC104-DAS08 to this signal source because
you will not be able to make an accurate measurement.
Voltage between the two grounds means that you will create a
ground loop if you connect the signal ground to the PC104-DAS08
board ground. Current flow in the ground loop can damage the
board and possibly the computer.
2.3 SINGLE-ENDED INPUTS
A single-ended input is two wires connected to the board, a channel high (CH# HI)
and a Low Level Ground (LLGND). The LLGND signal must be the same ground
the PC is on. The CH# HI is the voltage signal source. There is no common mode
rejection on a single-ended input so shielding and proper grounding is important
both for voltage differentials and for noise immunity. If greater amplification or
expanded differential inputs are required, we suggest using a CIO-EXP32, 32
channel or CIO-EXP16, 16-channel analog input multiplexer and amplifier.
7
PC 104-D AS08
37 -p in ca ble, as
C 37 FF -x, etc.
Back Plate
BP40-37