DBK88-Channel High-Voltage Input CardOverview …… 1
Hardware Setup …… 2
Card Configuration …… 2
Card Connection …… 2CE Compliance …… 2
DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 3
DaqBook/2000 Series & DaqBoard/2000 Series Configuration …… 3
Daq Device Connection …… 3
Safe Mounting …… 3

Software Setup …… 3
DBK8 – Specifications …… 4
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.
Note:

DBK8 has a footprint for installing a second DB37 connector, to accommodate input signals.
Pins 30 to 37 correspond to channels 7 to 0; pins 11 to 18 correspond to channels 15 to 8
(or low 7 to 0 in differential mode). This pinout [for the footprint] is the same as P1 for the 16 main
channels, with exception that the non-channel pins are not wired. Chapter 2 includes P1 pinouts.

Overview
The DBK8 reads voltages up to ±100 V from DC to 10 kHz. The inputs are balanced differential andreferenced to the LogBook or the Daq Device analog common. No external biasing resistors are used. The
input impedance of each DBK8 channel is 10 MΩ to minimize loading of the circuit being measured. TwoDBK8s can share the same base channel to allow a maximum of 32 DBK8s and 256 high-voltage inputs.

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DBK8, pg. 1

Each DBK8 channel has 3 user-set voltage ranges: ±10 V, ±50 V, and ±100 V. The ranges are selected by
the placement of shunt jumpers on pin headers for each channel. While the channel-to-channel resistanceis 10 MΩ, there is no other inherent isolation between the channels. The common of the host computer hasa direct connection to the LogBook or the Daq Device analog common. Either side of any input channel is5 MΩ from analog common.
The DBK8 has 3 attenuation factors.
• The ±100 V range attenuates the input by a factor of 20.
• The ±50 V range attenuates the input by a factor of 10.
• The ±10 V range attenuates the input by a factor of 2.
Note: The signal coming from the DBK8 into the LogBook or Daq Device does not exceed ±5 V.

Hardware Setup
Card Configuration
Factory Defaults: Voltage Range (each channel) - ±10V
Inputs from 1 or 2 DBK8s are multiplexed into 1 of the base channels.
Channel selection is made on 2×16-pin header JP1A by placing the shuntjumper on the pair of pins next to the chosen base channel.
The addressing scheme allows for 16 inputs on each analog channel. The
DBK8 is an 8-input card; and 2 DBK8’s can use the same channel if one
is configure for low channels and the other for high channels. Placing theshunt jumper on JP16 in the 2-1 position sets the card address for thelower 8 channels (0-7) in an address group. Placing the shunt jumper on
JP16 in the 2-3 position sets the card address for the upper 8 channels (815).
Each of the 8 input channels has 3 voltage ranges that are manually
selected by the placement of a pair of shunt jumpers on a channel range
select header. It is important that both jumpers are placed on the samerange value or incorrect voltage readings will be received by the system.

Card ConnectionThe DBK8 is equipped with screw terminal connectors for easy access toall of the analog inputs. Connections are provided for 8 pairs of inputs
and 2 analog-commons. There is a high and a low terminal in eachchannel pair to maintain consistent polarity signs with voltage readings. For AC signals, the polarity isarbitrary unless multiple signals are being connectedwith an interest in channel-to-channel phase relationships. After all connections
are in place, captive areas are provided at the end of the DBK8 for securing thewires to the board. Nylon tie wraps (not included) work well for this purpose.

CE Compliance
Reference Notes:
Should your data acquisition system need to comply with CE standards, refer tothe CE Compliance section of the Signal Management chapter.

DBK8, pg. 2888194

DBK Option Cards and Modules

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration
Use of the DBK8 expansion card with DaqBooks/100 Series & /200 Series devices andDaqBoards [ISA type] requires 3 jumper settings.
1.

If not using auxiliary power, place the JP1 jumper in the expanded analog (Analog Option Card Use)mode. This is indicated for JP1, in the following figure.

JP1 Default
Analog Option Card

DaqBook/100 Series & /200 Series and DaqBoard [ISA-Type] Jumper Settings for the DBK8
Note: JP1’s default position is necessary to power the interface circuitry of the DBK42 via the internal+15 VDC power supply. If using auxiliary power cards DBK32A or DBK33, you must remove
both JP1 jumpers. Refer to Power Requirements in the DBK Basics section, as well as to theDBK32A and DBK33 sections of the manual.
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.

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

Daq Device Connection
Several options exist for placement of the DBK8 card in a system. Because the inputs can be high-voltage,
the card should be physically secure and out of harm’s way. DBK8 will install in the 3-position DBK10chassis, 10-position DBK41 card cage, the card slot in either the DaqBook/112 or /216, or in a section of asnap-in mounting track (mounted to a secure surface), or used as an insulated holder for a loose DBK8.

Safe Mounting
Several options exist for placement of the DBK8 card in a system. Because the inputs can be high-voltage,
the card should be physically secure and out of harm’s way. The DBK8 will install readily in the 3position DBK10 chassis, the 10-position DBK41 card cage, or in a section of a snap-in mounting track
mounted to a secure surface or used as an insulated holder for a loose DBK8.

Software Setup
Reference Notes:
o DaqView users - Refer to chapter 2, DBK Setup in DaqView.
o LogView users - Refer to chapter 3, DBK Setup in LogView.

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DBK8, pg. 3

DBK8 - Specifications
Name/Function: 8-Channel High-Voltage Input CardConnectors:
DB37 male, mates with P1screw terminals
DB37 footprint, for signal inputs
Voltage Input Ranges: ±10 VDC, ±50 VDC, ±100 VDC; selection by jumper for each channel.
Input Impedance: 10 MΩ
Attenuation:@ 10 V, Vout=Vin/2@ 50 V, Vout=Vin/10@ 100 V, Vout=Vin/50
Output Voltage Range: ±5 VDC
Bandwidth: 15 kHz
Attenuation Accuracy: 0.5%
Offset Voltage: Typical: 0.5 mV; Maximum: 2.0 mV
Offset Drift : Typical: 4 µV/ºC; Maximum: 10 µV/ºC
Common Mode Rejection:

DBK8, pg. 4Range

TypicalMin.

10 V-68 dB-55 dB

50 V-65 dB-53 dB

100 V-63 dB-51 dB

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DBK Option Cards and Modules