Measurement Computing DBK52 - Manual

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