AMX AXP-AI8 ANALOG 8-INPUT BOARD Manuale Utente Scaricare il pdf (Pagina 18)

DNA/DNR-AI-217 Simultaneous Sampling Differential Analog Input Board

Chapter 1 14

Introduction

Tel: 508-921-4600 www.ueidaq.com Vers: 4.5

Date: April 2013 DNx-AI-217 Chap1x.fm

United Electronic Industries, Inc.

1.9.1 Analog Input

Ground

Connections

To avoid errors caused by common mode voltages on analog inputs, follow the

recommended grounding guidelines in Figure 1-6 below. Because all analog

input channels in AI-201/202/207/208/217/225 layers are isolated as a group,

you can connect layer AGND to the ground of the signal source and eliminate

the resistors shown in Figure 1-6 for floating differential input signals.

Figure 1-6. Recommended Ground Connections for Analog Inputs

1.10 CJC Data Raw CJC Voltage from the AI-217 may be represented as:

For example, if the voltage read from Channel 33 (the CJC channel) is 0.87, the

CJC Temperature is:

Input

Configuration

Type of Input

Floating Grounded

Typical Signal Sources:

Thermocouples

DC Voltage Sources

Instruments or sensors

with isolated outputs

Typical Signal Sources:

Instruments or sensors

with non-isolated outputs

Differential

Two resistors (10k <R< 100k) provide

return paths to ground for bias currents.

Single-Ended,

Ground

Referenced

Ret

AGnd

DNA

STP

AInX

Sig

DNA-STP-AI-U

Ret

AGnd

DNA-STP-AI-U

AInX

Sig

Ret

AGnd

DNA-STP-AI-U

AInX

Sig

Ret

AGnd

DNA-STP-AI-U

AInX

Sig

grounds are at the same potential.

Add this connection to ensure that both

NOT RECOMMENDED

Temp. Scale Calculation CJC Temperature

Kelvin 0.87/0.00295 294.9 °K

Celsius 294.9 – 273.15 21.75 °C

Fahrenheit 1.8 x 21.75 + 32 71.75 °F

Kelvin

CJCVoltage

0.00295

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1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25

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