DBK15

Universal Current/Voltage Input CardFeatures• Ideally suited for 4 to 20 mA measurements• Can measure up to ±30V*• Provides 16 differential input channels• Offers user-configurable current orvoltage input
Each DBK15 multiplexing input card
provides 16 channels of current or voltage
input to IOtech’s data acquisition systems.
A system can accept up to 16 DBK15 cards,
for a total of 256 potential analog input
channels per system.
The DBK15 features a 16-channel ­multiplexer
and a programmable gain input amplifier.
Its durable component sockets accept resistors that configure each channel for either
current-to-voltage conversion or for voltage
attenuation. The DBK15 is supplied with­sixteen precision 250 Ohm resistors formaking 4 to 20 mA measurements, andsixteen sets of 6:1 voltage dividers for accommodating up to ±30V* inputs.
The DBK15 can also accept other usersupplied resistor values, facilitating userselectable current-to-voltage conversion orvoltage attenuation factors.
When employed without resistors, theDBK15 provides 16 differential voltage
inputs, which accommodate ±5V fullscale inputs.
The DBK15’s input amplifier is software
programmable for x1 or x2 gain per­channel, and for unipolar 0 to +10V orbipolar -5 to +5V input per channel.

Voltage & Current
Measurements
The voltage and current input ranges shownin the accompanying charts supply a fullspan signal to the A/D converter, providing
maximum measurement resolution.

The DBK15 provides 16 channels of current or voltage input
Voltage Measurements. The DBK15 accommodates voltage measurements beyond
the standard 10V range, accepting voltage
divider resistors for up to ±30* VFS inputs.
You can obtain any combination of input
ranges by simply installing the appropriate
resistor combination on the DBK15 card.
The card’s on-board programmable gain
instrumentation amplifier (PGIA) can be set
for a ±5V output span or a 0 to +10V output
span, allowing users to set the A/D converter
for either ­configuration. The DBK15 canalso be configured to accept ±5V full scale­inputs without attenuation resistors.

Current Ranges
Input
Configuration
CurrentMin0Max+20 mA

Shunt250 Ohm

Gainx2

Configuration-20 mA+20 mA250 Ohmx1

otherotherotherx1, x2

Voltage Ranges
Input
Voltage

Current Measurements. The DBK15 isideal for accommodating transducers with4 to 20 mA output; it is only necessary toinstall the supplied 250 Ohm resistors inthe appropriate location on the board.
The DBK15’s on-board PGIA is software
selectable for either a ±5V output span ora 0 to +10V output span. To accommodate
other current ranges, you need only installa ­different shunt resistor for the DBK15.

MinMaxAttenuation

Gain0+5V—x20+10V—x1-2.5+2.5V—

x2-5+5V—x1-15+15V

6:1x2-30+30V*

6:1x1

otherotherotherx1, x2* ±10V to 30V input signals can be measured by installing <10 kOhms attenuation resistors on the card. For 1% or greater accuracy, the output impedance of themeasured signal should be <100 Ohms. To accurately measure high-voltage signals with >100 Ohms of output impedance, the DBK8 high-voltage input card should
be used rather than the DBK15. The DBK8 has very high-input impedance, which is ideal for measuring high-voltage input signals.

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DBK15Specifications & Ordering Information
Specifications

Connector: DB37 male, mates with P1*; screw terminals
provided for signal connection
Gain Ranges: x1, 2
Number of Channels: 16 differentialVoltage Input Ranges:  0 to +10 VDC, ±5 VDC(less attenuating resistors)
Current Input Range: ±20 mA max
Gain Accuracy: ±0.05% typ; ±0.25% max
Maximum Input Voltage(without damage): ±35 VDC
Maximum Allowable Common Mode Voltage
Ch to Ch: 10V
Slew Rate: 10 V/µs
Settling Time: 2 µs to 0.01%
CMRR: 80 dB min
Non-Linearity: 0.002% typ;0.015% max
Unattenuated Bias Current: 150 pA typ;0.2 µA max @ 25 ˚COffset Voltage: ±(0.5 + 5/G) mV @ 25 ˚C typ;± (2.0 + 24/G) mV @ 25 ˚C max
Offset Drift:±(3 + 50/G) µV/C˚ typ±(12 + 240/G) µV/C˚ maxPower Consumption:  485 mW

DBK15 Universal/Current Voltage Input Card Block DiagramP1
Mux ch. addr.
Gain selectOffset select

4RAChannelinput(1 of 16)

RBMux

X1
X2
OffsetswitchOrdering Information
Description
Universal current/voltage multiplexing
input card with 16 user-installable
6:1 voltage attenuation resistors and16 user-installable 250 Ohm
current shunt resistors

Outch.
selhdrProduct Compatibility
Part No.

✔ LogBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series

DBK15Cables
For use with DBK10, use CA-37-x ribbon cable, or
contact factory of additional cabling options
For use with DBK60 or LogBook/360, no cable isrequired (except from DBK60 or LogBook/360 tothe A/D mainframe)
For use with no enclosure, use CA-37-x where x is thenumber of DBK devices attached
For use with DaqLab Series (internal slots), useCA-255-2T with one board, or CA-37-2 for use with
two DBK cards (or contact factory for additional
cabling options)* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A, DBK209, DBK213, orDBK214

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