Measurement Computing DBK48 - Manual

8B Isolated Signal Conditioning Module 967792 DKB48, pg. 1
DBK48 Multipurpose Isolated Signal-Conditioning Module
Supports up to Sixteen 8B Modules
Description …… 1
Safety Concerns …… 2
Hardware Setup …… 2
Installing 8B Modules …… 4
Installing Plug-in Resistors to Create 4 to 20 mA Loops …… 5
Making Terminal Block Connections …… 6
Setting DBK48 Module Addresses …… 7
Configuring the Primary Data Acquisition Device …… 8
CE Compliance …… 9
Connecting the DBK48 to the Primary Data Acquisition Device …… 9
Using the DB25 Signal Output Connector …… 10
Powering the System …… 13
Software Setup …… 13
Specifications …… 16
Description
The DBK48 module can accommodate up to sixteen 8B isolated-input signal-conditioning modules for use
with Daq systems. A single cable connects the DBK48 output to the P1 analog input connector on the
primary device. One Daq system can support up to 16 DBK48 modules, providing a total of 256 isolated
analog input channels. The A/D converter scans the DBK48 channels at the same 5 µs/channel rate that it
scans all other channels from DBK series analog expansion and signal conditioning cards.
Other features of DBK48 include:
• Built-in power supply that operates from 10 to 30 VDC and can power a full complement of
8B modules (even with bridge excitation).
• Removable, plug-in screw-terminal blocks for convenient connection of 8B modules.
• On-board cold-junction sensing for thermocouple 8B modules.
• For each 8B module, 250 V isolation from the system and from other channels.
Note 1: Only channels 0, 2, 4, 6, 8, 10, 12, and 14 can be connected
to excitation. For example, in the above block diagram
Channel 0 could be connected to Excitation; Channel 1
could not.
Note 2: Each channel can accept a plug-in resistor to serve as a
current shunt. In the above diagram, Channel 0 has a
current shunt installed, Channel 1 does not. Only current-
input type modules require the plug-in resistors. The plug-in
resistors must be removed for all other module types.