Measurement-computing DBK80 User Manual download pdf

DBK80 16-Channel Differential Voltage Input Card

with Excitation Output

Overview …… 1

Hardware Setup …… 2

Card Connection …… 2

Card Configuration …… 4

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 5

DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 6

Software Setup …… 6

DBK80 – Specifications …… 6

Reference Notes:

o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to your

system, as needed.

o In regard to calculating system power requirements, refer to DBK Basics located near

the front of this manual.

Overview

The DBK80 is a low-noise, high-speed, unity-gain multiplexer card that provides 16 channels of

differential voltage input. Up to 16 such cards can be attached to a single Daq device, providing a possible

256 differential input channels. The card’s unity gain combines with DaqBook, DaqBoard, and LogBook

gains to accept full scale inputs from ±156 mV to ±10 V. The DBK80’s expansion channels can be

scanned at the maximum 200 kHz rate while maintaining measurement integrity.

The DBK80 includes an on-board excitation voltage source that is jumper-selectable to be +5 or +10 VDC.

This source can be used to bias transducers or to measure resistors and thermistors without additional

instrumentation.

Note 1: Offset adjustment is only intended for use during

calibration.

Note 2: JP2 is used to select an excitation source output

voltage of +5 VDC or +10 VDC. The factory default

is +5 VDC.

DBK80 Block Diagram

DBK Option Cards and Modules 989494 DBK80 pg. 1

1 2 3 4 5 6

Summary of Contents

Page 1 - Overview

DBK80 16-Channel Differential Voltage Input Card with Excitation Output Overview …… 1 Hardware Setup …… 2 Card Connection …… 2 Card Configuration ……

Page 2 - Hardware Setup

Hardware Setup Card Connection DBK80 Board Layout Referring to the figure above, voltage input signals are connected to the screw terminal blocks

Page 3 - 989494 DBK80 pg. 3

Three examples of using the excitation source follow. They are Position Sensing, Resistance/Thermistor Measurement, and Reading a Transducer.

Page 4 - Card Configuration

Source impedance below 1000 ohms will create negligible error. Above 1000 ohms, the effects are increasingly noticeable. An accurate source in serie

Page 5 - Devices

The excitation output voltage is set via JP2. JP2 Location Reference The above figure is of a partial DBK80. JP2 is shown selected to +5VDC. Note

Page 6 - DBK80 - Specifications

DaqBook/2000 Series and DaqBoard/2000 Series Configuration No jumper configurations are required for the /2000 series devices. Software Setup The DBK

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Measurement-computing DBK80 User Manual

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