Measurement Computing DBK42 - Manual (Page 2)

Each terminal block contains 4 terminals (per channel) for access to input and excitation features of 5B
modules.
The optional CN-71 and CN-72 signal connection blocks provide a convenient way of connecting analog
signals to the DBK42.
• The CN-71 is for non-thermocouple use.
• The CN-72 (with cold junction sensors) is for thermocouple use. The CN-72 has a clear
plastic shield over its screw terminals to protect you from high voltage on the input terminals.
Hardware Setup
DBK42 Connection
The DBK42 has screw-terminal connectors for easy access to the analog inputs. 2-wire and 4-wire
hookups are shown later in this section.
Note: Analog channels are isolated from each other, and no analog ground is provided.
DBK42 Configuration
Up to 16 DBK42s can connect to a LogBook or a Daq device. As a daisy-chain interface,
each module must appear unique and use a different channel.
To configure the module, locate the 16×2-pin header (JP1) near the front of the DBK42
board. Note the 16 jumper locations labeled CH0 through CH15 representing the base
Analog Input Channels. Place the jumper on the channel you wish to use.
Only one jumper is used on a single DBK42. No two cards in a system
can use the same JP1 setting.
5B Module Connection
Each input of the DBK42 is processed through a user-installed 5B signal-conditioning module. Different
5B modules are used with different transducer and signal sources. To install the modules:
1. Match the footprint of the module with the footprint on the circuit board (see figure).
2. Gently place the module into the footprint, and screw it down.
3. When installing current input modules (SC-5B32 series), install the supplied current-sense resistor
(SC-AC-1362) in the resistor footprint adjacent to the module mounting footprint.
4. Record the module’s channel number; label all units and connectors for identification.
Power Considerations
The DBK42 has an internal, isolated switching-type power supply that operates on 10-20 VDC at varying
input currents depending on the input voltage and 5B-module loading. The power drain at a given output
load is constant; input current will vary inversely with the input voltage.
DBK42, pg. 2 967694 DBK Option Cards and Modules