DBK65

8-Channel Transducer Interface ModuleFeatures• 8 channels of 2-, 3-, 4-, or 6-wiret­ ransducer inputs• Attaches to P1 connector, or directly
to WaveBook voltage input channels(via optional cables)• Provides excitation voltage of 5V,
10V, 15V, and 24V, jumper selectable
per channel• Custom excitation voltage of 5 to 20V
with user-supplied resistor• Accommodates internal current-shunt
resistor, selectable per channel• Convenient 6-terminal removable screwterminal connectors• 2-terminal switch-closure provided perchannel for transducer calibration
The DBK65 provides 8 channels of transducer interface capability, making it easy toconnect 2-, 3-, 4-, and 6-wire transducers.
Convenient removable screw-terminal connectors, one per channel, make attaching
and removing ­transducers quick and easy.

Usage Examples

2-wire voltsv

Switch A
Switch B+Excitation-Excitation+Signal-Signal3-wiretransducer

4-wiretransducer

Transducer
with internal
calibration

Input Configurations for any Channel
Rear panel
slide switch
One of 8 channels

Switch A
Switch B+Excitation-Excitation+Signal-Signal

24V15V
10V Excitation
source5V

Signal out
Signal com

Switch A
Switch B+Excitation-Excitation+Signal-SignalPower inPower com
Signal out
Signal com

Switch A
Switch B+Excitation-Excitation+Signal-Signal

Cal A
Cal B
Power inPower com
Signal out
Signal com

Switch A
Switch B+Excitation-Excitation+Signal-SignalPower in

Measurement Computing

8 to 1
multiplexer
P1

Instrumentation
amplifier–IA+

User-installed shuntfor current measurement

Switch A
Switch B+Excitation-Excitation+Signal-Signal2-wire transducer
with 4-20 mA output

3-wiretransducer

Switch A
Switch B+Excitation-Excitation+Signal-Signal

The DBK65 supplies transducer power and easy connectivity to the acquisition system

Outputchannelselectionswitch

Excitation voltages+5 +10 +15 +24
10 to 30 VDC
DC-DCConverter

DCpower inDC
power out

The DBK65 is a unity gain universal signal
conditioning module that is ideally suitedfor 4 to 20 mA transducer outputs, 3-wirestring pots, and other high-voltage output transducers. It can also be used with
4- and 6-wire bridge-based transducers
with internal shunt calibration whereadditional gain is provided by the dataacquisition system*.

between 5 and 20V can be set with a usersupplied resistor. Two terminals on eachchannel provide a relay closure that canbe used to switch in an internal calibration resistor for 6-wire transducers. The
8 relays can be enabled via a rear-panel
switch which activates 8 internal relays.
The relay closures on all 8 ­channels areenabled simultaneously.

Each channel can be setup for a different
excitation voltage, with 5, 10, 15, and24V provided by the DBK65’s internal
power supply. A custom voltage source* See DBK43 and DBK16 for use with low-level strain
gage and load cell based transducers(508) 946-5100

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DBK65Specifications & Ordering Information
Specifications

When used with an IOtech Daq system, a multiplexer in theDBK65 is controlled like any other expansion input channel
via the P1 expansion port. When used with WaveBook systems,
the user is required to wire the transducer signal to a BNC cableand attach to a WaveBook or WBK10A voltage input channel.

Dimensions:  285 mm W x 220 mm D x 45 mm H (11” x 8.5” x 1.75”)
Weight: 1.13 kg (2.5 lbs)
Operating Temperature: -30 to +70 ˚C
System Connector: DB37 male, mates with P1*
Transducer Connector: 6-pin removable screw-terminal block
Power Connector: 5-pin DINS that allow daisy-chaining
DC Power Input: 10 to 30 VDC
DC Power Required: 15V @ 833 mA, 20V @ 625 mA, assuming max load, 755
mW required from P1 when used with a DaqBook
Gain Ranges: x1Inputs: 8 differential voltage inputs
Maximum Input Voltage Range: ±10VInput Impedance: 20M Ohm
Accuracy: ±[0.025% +150 µV] (typ); ±[0.1% +250 µV] (max)Noise: 65 µV RMS
Temperature Coefficient:  10 ppm for every degree outside the range of 0 to 50 ˚C
Maximum Input Voltage (without damage): ±35V
3 dB Bandwidth: 2.6 MHz
CMRR: 80 dB typ
Output Voltage: Each channel, jumper-selectable to +5V, +10V, +15V, and +24V
Voltage Accuracy: ±2% typicalCurrent Limit: 100 mA per channel
Load Regulation: 5% typ
Total Output: 240 mA max for all 8 channels

DaqBook and DBK65 System ExampleDaqBook/2020
16-bit, 200-kHz A/D converter
CA-255-2T

DBK65
8-channel transducer
interface module

Ordering Information

WaveBook and DBK65 Excitation Example

Description
8-channel transducer interface module

Part No.
DBK65

Accessories & Cables
ANALOGCOMMONANALOG TRIGGER
CH1
CH2

CH3

CH4CH5

CH6

CH7

CH8

PULSE TRIGGER

DIGITAL I/O
EXTERNAL CLOCKTTL TRIGGER

ACTIVEREADY
POWER

MADE IN U.S.A.

Rack mount kit
Molded T expansion cable; 2 in.
Molded T expansion cable; 4 in.
Ribbon cable, where x is the number of DBK devices attached

WaveBook/516EEthernet-based 16-bit, 1-MHzdata acquisition system

RackDBK3
CA-255-2T
CA-255-4T
CA-37-x

Note: The CA-37-x ribbon cable can also be used in lieu of the CA-255-x
molded T cables.
DBK658-channel transducer
interface module *Product Compatibility✔ WaveBook✔ ZonicBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series* DBK65 provides transducer excitation

Removable terminal blocks for each channel make wiring to yoursensor easy

* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A,DBK209, DBK213, or DBK214

Measurement Computing(508) 946-5100

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