DBK15

Universal Current, Voltage Input CardOverview …… 1
Hardware Setup …… 2
Card Configuration …… 2
Card Connection …… 3
DaqBook/100 & /200 and DaqBoard [ISA-Type] Configuration …… 4
DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 4

Software Setup …… 5
DBK15 – Specifications ……5DO NOT adjust the potentiometers! Evidence of adjustment voids the factory warranty!

Reference Notes:
o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to yoursystem, as needed.
o In regard to calculating system power requirements, refer to DBK Basics located near
the front of this manual.

Overview
DBK15 uses a 16-channel multiplexer and a programmable gain input amplifier (PGA). Component
sockets accept resistors that configure each channel for current-to-voltage conversion or for voltage
attenuation. The differential signal input from the transducer must use 3 leads: high, low, and common.
When configured by appropriate resistors, the DBK15 can measure voltages up to 30 VDC or currents up
to 20 mA. Each of 16 input channels has a resistor “A” and “B” location. Installing various resistors inthese locations yields channel-to-channel flexibility. The DBK15’s input amplifier is software
programmable for ×1 or ×2 gain per channel, providing unipolar 0 to +10 V or bipolar -5 to +5 V ranges
per channel.

DBK Option Cards and Modules

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DBK15, pg. 1

Hardware Setup
DO NOT adjust the potentiometers! Evidence of adjustment voids the factory warranty!

Card Configuration
Factory Default: Input range of ±5V1.

Determine the LogBook’s or Daq device’s Analog Input Channel for each DBK15in your system. As few as one or as many as 16 DBK15’s may be connected toyour device. Since this is a daisy-chain type interface, each card must appearunique. This is accomplished by assigning each card to a different Analog Input on
the LogBook or the Daq device.

2.

Locate the 16×2 pin header labeled JP1 near the front of the board. Note the 16
jumper locations on this header labeled CH0 through CH15 corresponding to theLogBook’s or Daq device’s Analog Input Channels.

3.

Set JP1 jumper on the pins for your intended output channel (CH0-CH15, seefigure). Only one jumper is used on a single card. No two cards in the same
system can have the same jumper setting.

4.

On enhanced versions of this board, bias resistors have been installed between the channel lows andanalog common. If you have an early version of the board, you can still install bias resistors. The useof bias resistors is discussed in the Signal Management chapter.

5.

Determine values for RA and RB for each input signal channel. Standard RN55D (¼ watt, 1%, metalfilm) resistors or 22 gage bare wire (short) plug in pin sockets. See the following table.
Note that a multiplexed input in sampled data systems must have low impedance to allow for
accurate measurements. For 12-bit accuracy at 100 kHz, equivalent attenuator impedances should beless than 1 kΩ and signal sources must have impedances less than 1/4000 of the attennuator inputimpedance. For example, a 2:1 attenuator using 2 KΩ resistors will have 1 KΩ of equivalent
impedance; but the source impedance must be less than 1/2 Ω (1/4000 of 2000) for 12-bit
measurement accuracy to be attained.

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DBK Option Cards and Modules

Input Range

RAGainPolarity±5 VDC

10 Ω
Short
2 KΩ

Open×1

Bipolar

2 KΩ

×1

Bipolar

2 KΩ

×1

Bipolar±20 mA

10 KΩ
Short

249 Ω

×1

Bipolar±20 mAShort

124 Ω×2

Bipolar

±2 mA

Short

1240 Ω×2

Bipolar±10 VDC±30 VDC

6.

RB

Install resistors in RA and RB sockets for each channel as desired (see figures).

In voltage mode, RA and RB (installed by the user) form a resistor divider network. In current mode, RA isalways shorted, RB is shunted with a resistor. 8 channels can be configured alike with 16-pin, 8-resistor DIP-8resistor networks. With no resistors, DBK15 provides 16 differential voltage inputs for +5 V full-scale inputs.
CL positions are used for bias resistors if necessary. Two differential measurement configurations can be used:floating or referenced differential. Refer to the Signal Management chapter for more information.

DBK Option Cards and Modules

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DBK15, pg. 3

Card Connection
1.

Connect the signal input wires to the appropriate screw terminals. The DBK15 is equipped withscrew terminal connectors for easy access to inputs and ground access points. Connectors areprovided for 16 differential inputs and are labeled by channel number and H and L for high and low
analog inputs. On board, there are 100KΩ bias resistors in the CL locations per channel (the CHlocations are not used). These resistors can be removed if desired.
The DBK15 card only supports differential inputs (not single-ended). Connect thehigh end of the signal to the High input and the low end to the Low input of thedesired channel. Ground referencing to Analog Common is important for optimum
accuracy.

2.

Use tie wraps (not included) and the board’s edge-holes to secure all wires in a way that will notallow mechanical stress to affect the signal connection. In other words, be sure to provide a degreeof slack, or “strain-relief.”

DaqBook/100 Series & /200 Series and DaqBoard [ISA-Type] Configuration
Use of the DBK15 requires setting jumpers in DaqBooks/100 Series & /200 Series andDaqBoards [ISA type].
1.

If not using auxiliary power, place the JP1 jumper in the expanded analog mode.
JP1JP3JP4-15 V-OCTOUT-OCLKIN+15 V
Analog Option
Card Use

BipolarSingle-EndedFactory Default Factory Default

DaqBook/100 Series & /200 Series and DaqBoard[ISA-Type] Jumpers for the DBK15

Note: The JP1 default position is necessary to power the interface circuitry of the DBK5 via the internal±15 VDC power supply. If using auxiliary power (e.g., DBK32A or DBK33), you must remove
both JP1 jumpers. Refer to Power Requirements in the DBK Basics section and to the DBK32A
and DBK33 sections as applicable.
2.

For DaqBook/100, DaqBook /112 and DaqBook /120 only, place the JP3 jumper in Bipolar mode.

3.

For DaqBook/100, DaqBook /112 and DaqBook /120 only, place the JP4 jumper in single-endedmode.

Note: Analog expansion cards convert all input signals to single-ended voltages referenced to analog
common.

DaqBook/2000 Series and DaqBoard/2000 Series Configuration
No jumper configurations are required for these /2000 series devices.

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DBK Option Cards and Modules

Software Setup
Reference Notes:o DaqView users - Refer to chapter 3, DBK Setup in DaqView.
o LogView users - Refer to chapter 4, DBK Setup in LogView.

DaqView Users: When DBK15 is used with DaqBoard/2000 Series or /2000c Series Boards, theInternal Clock Speed must be set to 100 kHz as described in the DaqView document module.

DBK15 – Specifications
Name/Function: Universal Current/Voltage Input Card
Input Connectors: Screw terminals for signal connections
Output Connector: DB37 male, mates with P1 using CA-37-x cable
Attenuation/Shunt Resistor Connector: Machine sockets accommodate standard ¼-watt resistors
Gain Ranges: ×1, ×2Inputs: 16 differential
Voltage Input Ranges: ±5 VDC max
Current Input Range: ±20 mA max
Attenuator Resistors:
Accuracy: +1%
Temperature Coefficient: 100 ppm/ºC
Gain Accuracy: ±0.05% typ, ±0.25% max
Maximum Input Voltage: ±35 VDC
Slew Rate: 10 V/µs
Settling Time: 2µs 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 @ 25ºC
Offset Voltage:±(0.5 + 5/G) mV @ 25ºC typ±(2.0 + 24/G) Mv @ 25ºC max
Offset Drift:±(3 + 50/G) µV/ºC typ±(12 + 240/G) µV/ºC max

Note: Specifications are subject to change without notice.

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DBK15, pg. 5

DBK15, pg. 6889094

DBK Option Cards and Modules