B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuel d'utilisateur télécharger pdf (Page 23)

Documentation Number UD128A8D4602 Manual Chapter 2 19

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph 353-91-792444 – Fax 353-91-792445

Scaling A/D Input Using Vref Adjustment

A/D

REF

Analog

GND

UD128A8DExternal Circuit

Vref

(5V +/-0.5%)

4.7K

To A/D Vref

Shunt (LM4040/1)

Type Voltage

Reference

(1.2V to 4.1V)

Fig. 2.19 – Using Zener or other Reference Diodes to Set F/S

Checking Input Calibration

Analog

Input

UD128A8DExternal Circuit

Analog

Output 0

Analog

GND

Volt Meter

Fig. 2.20 – Checking Input Calibration Using the DA Output

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B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuel d'utilisateur Page 23