Measurement-computing DBK52 User Manual download pdf

DBK52 14-Channel Thermocouple Input Module

Overview …… 1

Hardware Setup …… 2

Module Connection …… 2

Module Configuration …… 3

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 3

DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 3

Software Setup …… 4

DBK52 – Specifications …… 4

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

DaqView Users: When DBK52 is used with /2000 Series Devices, the Internal Clock Speed

should be set to 100 kHz as described in Chapter 3, DBK Setup in DaqView.

The DBK52 provides the ability to scan and input thermocouple data for various computer-based

temperature-monitoring systems. Features include:

• Each DBK52 can connect up to 14 thermocouples. Up to 16 DBK52s may attach to a single

LogBook or Daq Device to measure a maximum of 224 (16 × 14) temperatures.

• Standard, miniature jacks can connect to all T/C types.

• Onboard cold junction sensor (CJS) circuitry is accessible via a built-in channel to the system.

• A built-in short-to-ground channel back to the system eliminates offset errors via software.

• RC low-pass input filters reject high frequency noise for thermocouple shields.

• An external analog-common access jack provides a bias-current return path for differential

signal inputs.

• An onboard programmable gain amplifier supports most thermocouple types and temperature

ranges.

• Software-based linearization (in LogView and DaqView) converts analog signals into

temperature values.

Reference Note:

In regard to Daq devices, related material for programmers is included in the separate

Programmer’s Manual (p/n 1008-0901).

The following table shows the temperature range for each thermocouple type.

T/C Type J K T E N28 N14 S R B

Temperature

Range °C

-200 to

760

-200 to

1260

-200 to

400

-270 to

1000

-270 to

400

0 to

1300

0 to

1780

0 to

1780

0 to

1820

Temperature

Range °F

-328 to

1400

-328 to

2300

-328 to

752

-454 to

1832

-454 to

752

32 to

2372

32 to

3236

32 to

3236

32 to

3308

Thermocouple accuracy depends on the thermocouple itself, the cold-junction sensor, A/D conversion, and

linearization. The DBK52, LogBook, and Daq device systems use quality components and software

compensation to minimize error from these sources. Systems achieve a ±1°C CJS accuracy that contributes

to the overall accuracy. When the software is calibrated, gain and offset errors are virtually eliminated.

The DBK52’s built-in auto-zero channel dynamically eliminates any other system offset-errors.

DBK Option Cards and Modules 989594 DBK52, pg. 1

1 2 3 4

Summary of Contents

Page 1 - Overview

DBK52 14-Channel Thermocouple Input Module Overview …… 1 Hardware Setup …… 2 Module Connection …… 2 Module Configuration …… 3 DaqBook/100 Series &am

Page 2 - Hardware Setup

True differential measurements of T/Cs require bias-current referenced to the analog common. Resistors from each input T/C are connected to the analo

Page 3 - Module Configuration

Module Configuration Up to 16 DBK52s may be connected to a LogBook or a Daq Device. As a daisy-chain interface, each module must appear unique. Each

Page 4 - DBK52 - Specifications

Software Setup Reference Notes: o DaqView users - Refer to Chapter 3, DBK Setup in DaqView. o LogView users - Refer to Chapter 4, DBK Setup in L

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Measurement-computing DBK52 User Manual

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