Measurement-computing CIO-EXP32 Instrukcja Użytkownika Pobierz pdf (Strona 18)

Chapter 3

Functional Details

CIO-EXP32 inputs

The CIO-EXP32 inputs are screw terminals which will accept 12-22 AWG wire. Each channel has a screw

terminal for signal high, signal low and ground.

The inputs are differential, which require three connections from the signal source to the CIO-EXP32 — Signal

High, Signal Low, and Signal Ground. A typical connection is shown in . Figure 10

Figure 10. Differential channel connections

Signal High

Signal Low

Low Level Ground

Figure 11

Figure 11. Analog inputs block diagram

shows a block diagram of the board’s 16 analog inputs. One input is selected by the four MUX

address lines that are controlled by the A/D board.

MUX

HI-507

MUX

HI-507

CH15 HIGH

CH15 LOW

CH8 HIGH

CH8 LOW

CH7 HIGH

CH7 LOW

CH0 HIGH

CH0 LOW

GND

Gain

Switch

Gain

Switch

EXP out to the

DAS board

Ground

AMP

INA1 10

MUX ADDR

Connecting to a signal source

You can connect analog inputs to the CIO-EXP32 in either a floating differential or differential configuration.

Before connecting to a signal source, measure the voltage between the signal ground at the signal source and

ground at the PC. Do not connect to a signal source if the voltage difference exceeds 10 V, as you will not be

able to obtain a reading.

Caution! DO NOT connect to the signal if the voltage exceeds 30 V — voltages over 30 V will damage the

board and possibly the computer.

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