DBK48

16-Slot Multifunction Isolated Signal Conditioning
Features• Accepts up to sixteen 8B* isolateds­ ignal conditioning modules• Features removable screw-terminal
connectors• Offers built in cold junction compensation for thermocouple measurements
The DBK48 signal conditioning module
uses the new, low-cost 8B isolated signal
conditioning modules, and provides up
to 16 channels of I/O with 250V isolationfrom channel-to-­channel. The DBK48­attaches to any of IOtech’s productswith a P1 expansion port, including
the DaqBook, DaqLab, DaqScan, andDaqBoard/2000 Series of PCI boards**. Upto sixteen DBK48 modules can be attached
to one P1 port, for a total channel capacityof 256 ­channels. All DBK48 ­channels canbe scanned at 5 µsec/­channel.

The DBK48 accepts up to sixteen 8B signal conditioning modules

Input Configurations for any Channel
Signal Out
DB25Usage Examples++-+Vin
CH 0-Vin+EEXC-E

CH 0 has a full-bridgestrain gage.
CH 1 not connected.

+Vin
CH 1-Vin

SIG LSIG HCH 0+Vin
CH 0-Vin+EEXC-E+Vin
CH 1-Vin

CH 0 has a 4-wireconnection to an RTD.
CH 1 not connected.

+Vin
CH 0-Vin+EEXC-E+Vin
CH 1-Vin

CH 0 has a 3-wireconnection to an RTD.
CH 1 not connected.

+Vin
CH 0-Vin+EEXC-E

CH 0 has a half-bridgestrain gage.
CH 1 has a voltage input(mV or V).

EXC
CH 1JP0+Vin-Vin+E-E+Vin-Vin

16 to 1
multiplexor

8B
ModuleP1

Outputchannelselection
switch8B
ModuleCJC

Two of 16 channels+5JP1DC-DCConverter

10 to 30 VDC
DCpower inDC
power out+Vin
CH 1-Vin+-+-+Vin-Vin

CJC+VinCH 0-Vin+EEXC-E+Vin
CH 1-Vin

CH 0 has athermocouple input.
CH 1 has athermocouple input.

+Vin
CH 0-Vin+EEXC-E

CH 0 has a 2-wireconnection to an RTD.
CH 1 has a
4 to 20 mA input.

CH 1

Measurement Computing

20 Ohmplug-in resistor

All signal connections are accomplished
via removable screw-terminal connectors
on the DBK48’s front panel. Cold-junction
compensation is built into the DBK48,­allowing any channel to be configured
as a thermocouple (TC) input channel.
When 2-wire signals are attached to theDBK48, such as voltage, current or TC, all16 ­channels can be populated with 8B signal­conditioning modules. When 3- or 4-wiretransducers are used, such as strain gages(508) 946-5100

1or RTDs, then the maximum number of
3- or 4-wire ­transducers is eight, plus anadditional eight 2-wire transducers (volts,current, or TC). For example, one DBK48 canbe configured for 16 volts or TC ­inputs, or8 strain inputs plus 8 volts or TC ­inputs.

* 8B modules must be purchased separately. All sales
are final with no right of return.
** Requires an adapter for DaqBoard/2000 Series

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DBK48Specifications & Ordering Information
Signal Connections. Eight sets of removable screw-terminal blocks
are on the front of the DBK48. They provide access to all 16 input
channels. 8B modules generate a 0 to 5V or ±5V output signal that is
multiplexed onto the P1 analog input connector. The output signalof each 8B module is also available on a 25-pin DSUB connector
located on the rear panel of the DBK48, which can be measured
by any device capable of measuring a ±5V signal.

DBK48 System Examples
FrontBack

Notebook or Desktop PC

Specifications

Ethernet
DaqBook/2001
Ethernet 16-bit, 200-kHz
data acquisition system

Operating Environment:
Temperature: -30 to 70 ˚C
Relative Humidity: 95% RH, non-condensing
Vibration: MIL STD 810E Category 1 and 10
System Connector: DB37 male, mates with P1*
Power Connector: DIN5 x2 for daisy chaining
Module Capacity: 16 (input only) voltage or thermocouple 8B modules, or 8 strain
gage, potentiometer, or RTD 8B modules (any module requiring excitation)
Power Requirements (8B Modules): 10 to 30 VDC with included AC adapter
Power Consumption: 750 mW from P1 (typical)
DC Power Required: 15V @ 833 mA, 20V @ 625 mA, assuming max load, 755 mW
required from P1 when used with a DaqBook
DC Input Fuse: 2AInput Connections: Eight sets of removable screw terminals (6 connections each)
Channel-to-Channel Setting:  ±0.05% typ @ 200 kHz; ±0.025% typ @ 100 kHz
Isolation
Input Power to System: 250 VDC
Signal Inputs to System: 250 VDC
Input Channel-to-Channel: 250 VDC
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) with no modules installed
Voltage Accuracy: 0.015 + 0.005 (% reading + % range)
Voltage Range: ±5V
Cold Junction Sensor Accuracy: 2 ˚C (typical)

P1

CA-255-4T

DBK48

CA-195

DBK200Adapter board,
analog only

P1P4

DaqBoard/2000
16-bit, 200-kHz PCI data acquisitionboard with 16 analog inputs,
40 digital I/O, and 2 analog outputs

DBK48
Back View

Ordering Information

Powering the DBK48. The DBK48 is powered from a number ofsources: an included AC adapter, an ­optional DBK30A rechargeable
battery/excitation module, or directly from a 10 to 30 VDC source,
such as an automobile battery. The DBK48 has a built-in DC/DC
converter capable of providing 10W ­exclusively for 8B modules.

Description
16-slot multi-function 8B expansion module including AC adapter

Part No.
DBK48

Accessories & Cables
Rack-mount kit
8B Modules (see 8B module product page)5-pin DIN to automobile cigarette lighter power cable25-pin DSUB to eight BNC
Molded T expansion cable; 2 in.
Molded T expansion cable; 4 in.
Ribbon cable, where x is the number of DBK devices attached

RackDBK3
CA-116
CA-208-3
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.

Product Compatibility

DBK48 with cover open showing 8B signal conditioning modules✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series

8B modules allow a diverse range of signal conditioning requirements* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A,
DBK209, DBK213, or DBK214

Measurement Computing(508) 946-5100

2

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