DBK50 & DBK51

8-Channel Isolated Voltage-Input Modules
Features• Provide eight channels of isolatedinput• Offer bipolar input ranges of:
DBK50 (high-voltage)- 10V, 100V, and 300V full-scale ­input,
software programmable
DBK51 (low-voltage)- 100 mV, 1V, and 10V full-scale ­input,
software programmable• Provide 500V channel-to-channel
isolation and 500V channel-tosystem isolation• Powerable from:- included AC adapter- optional rechargeable battery
module- 12V car battery- any +9 to +20 VDC source
The DBK50 and the DBK51 are 8-­channel,isolated voltage-input modules that allow
IOtech’s data acquisition systems to isolate
up to 8 channels of analog input. Both theDBK50 and DBK51 modules ­offer 500V
isolation from channel-to-channel andchannel-to-system. Up to 32 modules canbe connected to one data acquisition ­system
for up to 256 isolated ­input channels.
Isolated Signal Connections. Each ­channelf e a t u r e s a d i s c o n n e c t a b l e s c r e w -­terminal block that provides access tothe ­a nalog inputs.

The DBK50 and DBK51 each offer eight channels of input via removable screw-terminal plugs

DBK50 & DBK51 Isolated Voltage-Input Modules Block Diagram
4Isolation
Ch 0Jumper location
decodingIsolation
Ch 1MuxOutAddr
Enb

P1

Output channel
selection header

Isolation
Ch 2

3Isolation
Ch 3

Gain
config.
µP

InputsIsolation
Ch 4

A 2- A 0

Address
recog.

A3

Address A3-A0
G 1- G 0
SSH

Isolation
Ch 5Power. The DBK50 and DBK51 include builtin DC/DC converters, allowing them to be
operated from a variety of external powersources. The units can draw power fromtheir included AC adapters; the optional
DBK30A rechargeable battery module; acar battery; or any +9 to +20 VDC source.

Isolation
Ch 6Isolation
Ch 7–15 +15+5DC/DC

DC/DC

5 VDC

9-20
VDC
supplyWide range
regulator

To DC/DC
converters ineach channel

BypassIsolation
amplifier
Programmableattenuatorandamplifier

Input

Low
pass
filterTo
analogmux

2-bit opto-iso2

From onboard µP

Isolated supply+15–15

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DC/DC

5 VDC

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DBK50 & DBK51

Specifications & Ordering Information
Input Amplifier. The DBK50’s input amplifiers provide input ranges for 10V, 100V,and 300V bipolar signals. The DBK51’s
input amplifiers provide input ranges
for 100 mV, 1V, and 10V bipolar signals.
These ranges are software programmable,
allowing you to change ranges without
having to access internal range-set jumpers or switches. The input amplifiers also
provide a zeroed input range, which allows you to incorporate auto-zero andtemperature drift compensation in yourdata acquisition applications.
Bandwidth Filter. The DBK50 and DBK51provide a selectable 3.5 Hz, low-pass filteron each channel. The corner frequency
can be bypassed by plugging in a different
standard resistor network. In addition, thelow-pass filter can be bypassed entirely, fora bandwidth of 20 kHz.

Ordering Information

Specifications

Connector: DB37 male, mates with P1*
Inputs:  Removable screw-terminal block
Channels: 8, individually isolated
Isolation
Channel-to-Channel: 500V
Channel-to-System: 500V
Input Impedance
DBK50: 1 MOhm
DBK51: >10 MOhm
Bipolar Input Ranges
Ranges are DC and peak-to-peak AC
DBK50: ±10V, ±100V, and ±300V
DBK51: ±100 mV, ±1V, and ±10V
Output Voltage Range: ±5 VDC
Accuracy:   ­Without offset correction, 1% of range;
with offset correction, 0.2% of range
Offset:  ±50 mV Max
NoiseWith Low-Pass Filter:  <5 mVp-p
Without Low-Pass Filter: <50 mVp-p
Temp. Coefficient: 0.2 mV/˚C
Attenuation Ratios: Vout = Vin/K
High-Voltage (DBK50)
10V
K = 2.0(gain = 0.5)
100V
K = 20.0(gain = 0.05)
300V
K = 60.0(gain = 0.0166)
Low-Voltage (DBK51)
0.1V
K = 0.02(gain = 50)
1V
K = 0.2(gain = 5)
10V
K = 2.0(gain = 0.5)
Bandwidth: 20 kHz (LPF bypassed)
Low-Pass Filter: Factory installed 3-pole, 3.5 Hz(by-passable or user set)
Operating Power Voltage Range:  +9 to +20 VDC
Module Power Requirements: 7.5W
Included AC Adapter: 15 VDC @ 0.9A
Dimensions: 285 mm W x 221 mm D x 36 mm H
(11” x 8.5” x 1.375”)
Weight: 1.7 kg (4 lbs)
Power Consumption:  35 mW

Description
Isolated high-voltage input module
Isolated low-voltage input module

Part No.
DBK50
DBK51

Accessories & Cables
Rack mount kit
Molded T expansion cable; 2 in.
Molded T expansion cable; 4 in.
Ribbon cable, where x is the numberof DBK devices attached

RackDBK2
CA-255-2T
CA-255-4T
CA-37-x

Note: The CA-37-x ribbon cable can also be usedin lieu of the CA-255-x molded T cables.

Product Compatibility✔ LogBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A, DBK209, DBK213, orDBK214

Measurement Computing(508) 946-51002

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