DBK50 and DBK51

8-Channel Isolated Voltage Input Modules

Overview …… 1Input Attenuation/Gain Factors …… 2Hardware Setup …… 2
Signal-to-Module Connection …… 2Module Configuration …… 2DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 3
DaqBook/2000 Series and DaqBoard/2000 Series Configuration …… 4

Software Setup …… 4
DBK50 and DBK51 – Specifications …… 4Reference 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
Except for their ranges, the DBK50 (high-voltage) and the DBK51 (low-voltage) are identical. Both haveeight channels isolated from themselves (750 V) and from the LogBook or Daq Device analog common(1250 V). Each channel’s input impedance is over 10 MΩ to minimize loading of the circuit being
measured. Voltages can be read from DC to more than 20 kHz. One of three voltage ranges can be chosen
via software:• for DBK50: ±10 V, ±100 V, or ±300 V.
• for DBK51: ±100 mV, ±1 V, or ±10 V.
With standard plug-in attenuator assemblies, the voltage ranges are interchangeable. The gain orattenuation factor depends on the range, but the full-scale output for any range is +5 V.
Note: A fourth “range” delivers a shorted input voltage reading to allow offset compensation in someapplications.

DBK Option Cards and Modules

989594

DBK50 and DBK51, pg. 1

Input Attenuation/Gain Factors
Gain and attenuation may be calculated using the formula:
K = Vin / Vout
where: K is the attenuation or gain factor (the values of K foravailable voltage ranges are given in the table).
Vin is the voltage applied to the module input channel.
Vout is the amplified or attenuated voltage from the module
output back to the main unit.

Input Range
Function
300 V Range
Attenuates
100 V Range
Attenuates
10 V Range
Attenuates
1 V Range
Amplifies
100 mV Range
Amplifies
Note: not all input ranges areavailable on a single unit.

K602020.2
0.02

Hardware Setup
Signal-to-Module Connection
The DBK50/51 rear panel has 8 plug-in screw terminals for easy access to the 8 analog input channels.
There is a high (right side) and a low (left side) terminal in each pair to maintain consistent polarity (seefigure). For AC signals, the polarity is arbitrary unless multiple signals must maintain their phaserelationship.

Module Configuration
Factory Default: Low-pass filter – Enabled
Several jumpers must be set on the DBK50 and DBK51 to match your application:• 2 jumpers on JP1A or JP1B to select the main channel to use (see following figure).
• 1 jumper on JP1C for upper or lower sub channels• 1 jumper on JPn02 to use or bypass the low-pass filter—one for each channel number (n)The main output channel is one of the 16 primary data acquisition device [LogBook or Daq device]channels. Each DBK50 [and DBK51] has 8 input channels and can be set to an upper or lower subchannel that allows 2 modules to share a single LogBook or Daq device channel. Thus, a fully-populated
system can have 256 input channels.
After determining a main channel number for the module, set two jumpers on JP1A or JP1B for the desiredchannel. The two jumpers must be used side-by-side on the selected channel. This is illustrated forchannel 0 in the following figure. Next, set the JP1C jumper for the eight upper or eight lower subchannels. Note that two modules may share the same main channel if one is set to the upper sub channel
and the other set to the lower sub channel.

Each of the 8 input channels has a 3-pole low-pass filter that may be manually selected or bypassed bypositioning 2 shunt jumpers on 2×2 headers for each channel. Orient the jumpers parallel/horizontal(enable) or perpendicular/vertical (bypass) to the header label (JP102 to JP802 for each of 8 channels).
The following figure can be used for orientation.
DBK50 and DBK51, pg. 2989594

DBK Option Cards and Modules

Channel Filter Jumper Settings for DBK50 and DBK51
The low-pass filters have a default corner frequency of 3.5 Hz when the jumpers are in the LPF-selectedpositions. This frequency may be readily changed by installing a different value of SIP resistor network inthe 6-pin SIP socket of each filter section. Each channel has its own SIP located next to the channel filter
bypass jumper and labeled RN(1-8)01A. The table lists values of common networks and their cornerfrequencies.
Corner Frequency

R-SIP

Bournes Part #7500 Hz

47 Ω

4606M-102-470

3500 Hz

100 Ω

4606M-102-101

1750 Hz

200 Ω

4606M-102-201

750 Hz470 Ω4606M-102-471

350 Hz1kΩ

4606M-102-102

175 Hz2kΩ

4606M-102-208

75 Hz

4.7 k Ω

4606M-102-208

35 Hz

10 k Ω

4606M-102-103

17.5 Hz20 k Ω

4606M-102-203

7.5 Hz47 k Ω

4606M-102-473

3.5 Hz100k Ω

4606M-102-104

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration
Several setup steps in DaqBook/100 Series & /200 Series devices and DaqBoards [ISA type] are required
to use a DBK50 or DBK51 module in a system.
1.

If not using auxiliary power, set the JP1 jumper [in the DaqBook/100 Series & /200 Series
devices or ISA-Type DaqBoard] to the Analog Option Card Use, also referred to as the
expanded analog mode.
JP1

JP2-15 V

DAC 1 - EXT-OCTOUT

DAC 1 - INT-OCLKIN

SSH+15 V
Analog Option
Card Use
JP3

DAC 0 - EXTJP4UNIBIBipolar

DAC 0 - INTSE
16CH
DIFF
8CH
Single-Ended

DaqBook/DaqBoard Jumpers for DBK50/51
DBK Option Cards and Modules

989594

DBK50 and DBK51, pg. 3

To power the interface circuitry of the DBK50 [or DBK51] via the internal ±15 VDC
power supply, JP1 must be set to “Analog Option Card Use.” However, if using
auxiliary power, e.g. the DBK32A or the 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.

CAUTION
When using the SSH output, do not use an external voltage reference for DAC1.
Applying an external voltage reference for DAC1, when using the SSH output, will
result in equipment damage due to a conflict on P1, pin #26.
2.

Place the JP2 jumper in the SSH position.

3.

For DaqBook/100, DaqBook /112 and DaqBook /120 only, place the JP3 jumpers inbipolar mode.

4.

For DaqBook/100, DaqBook/112 and DaqBook/120 only, place the JP4 jumpers insingle-ended mode.

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

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.
DaqBooks/100 Series & /200 Series devices and DaqBoards [ISA type] must have theSimultaneous Sample and Hold (SSH) jumper in place when using a DBK50 or DBK51.
DaqView will remind you of this when you exit Hardware Setup with a DBK50 or DBK51
selected.

DBK50 and DBK51 – Specifications
Name/Function: 8-Ch. Isolated Voltage Input Module
Connectors: Male DB37, mates with P1
Inputs: Removable screw terminals
Number of Channels: 8, individually isolated
Isolation:
Channel-to-Channel: 500 V
Channel-to-System: 500 V
Input Impedance:
DBK50: 1 MΩ
DBK51: >10 MΩ
Bipolar Input Ranges:
DBK50: ±10 V, ±100 V, ±300 V
DBK51: ±100 mV, ±1 V, ±10 V
Output Voltage Range: ±5 VDC
Accuracy:
Without Offset Correction: 1% of range
With Offset Correction: 0.2% of range
Offset: ±50 mV max
Noise:
With Low-Pass Filter: <5 mV peak to peakWithout Low-Pass Filter: <50 mV peak to peakTemperature Coefficient: 0.2 mV/°C

DBK50 and DBK51, pg. 4989594

Attenuation Ratios: Vout = Vin / K
DBK50:
10 V
K = 2.0gain = 0.5
100 V K = 20.0 gain = 0.05
300 V K = 60.0 gain = 0.0166
DBK51:
0.1 V
K = 0.02 gain = 50
1V
K = 0.2
gain = 5
10 V
K = 2.0
gain = 0.5
Bandwidth: 20 kHz (LPF bypassed)
Low-Pass Filter: Factory installed 3-pole, 3.5Hz(bypass or user-set)
Operating Power Voltage Range: +9 to +20 VDC
Module Power Requirements: 7.5 W
AC Adapter Rating: 15 VDC @ 0.9 A
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)

DBK Option Cards and Modules