Measurement-computing PC104-DAS08 Manuel d'utilisateur télécharger pdf (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.

PC104-DAS08

37-pin cable, as

C37FF-x, etc.

Back Plate

BP40-37

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Measurement-computing PC104-DAS08 Manuel d'utilisateur Page 11