Measurement Computing DBK19 - Manual

DBK19
14-Channel Thermocouple Card
Overview …… 1
Hardware Setup …… 2
Card Connection …… 2
Card Configuration …… 3
DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration ……3
DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 3
Software Setup …… 3
DBK19 – 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.
o Refer to the Signal Management chapter for information regarding Two-Point
Calibration of a Temperature Measurement System.
Overview
DaqView Users: When a DBK19 is used with a /2000 Series Device, the Internal Clock Speed
should be set to 100 kHz as described in chapter 3, DBK Setup in DaqView.
The DBK19 can attach to 14 thermocouples (T/C) for temperature measurements. The DBK19 features an
on-board cold junction sensor and a programmable-gain amplifier for measuring type J, K, T, E, N28, N14,
S, R, or B thermocouples. The 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
True differential measurements of thermocouples require a bias current referenced to analog common;
therefore, resistors connect each input terminal to the analog common. Filter capacitors across each input
operate with input protection resistors to form single-pole RC low-pass filters.
Each DBK19 includes a cold-junction compensation circuit wired to channel 0. Channels 2 through 15
accept external thermocouples. The DBK19s can be used with other analog expansion cards and feature
screw terminals for direct connection. Up to 16 DBK19s can be attached to a single LogBook or a Daq
Device to measure up to 224 (16 × 14) temperatures.
DBK Option Cards and Modules 879795 DBK19, pg. 1