Omega Engineering OMB-DBK-34A, User Manual

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DBK17
4-Channel Simultaneous Sample and Hold Card
Overview ...... 1
Simultaneous Sample and Hold ...... 2
Hardware Setup ...... 2
Card Connection ...... 2
Card Configuration ...... 2
CE Compliance ...... 3
DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration ...... 4
DaqBook/2000 Series and DaqBoard/2000 Series Configuration ...... 4
Software Setup ...... 4
DBK17 – Specifications ...... 5
Reference Notes :
o
Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to your
system, as needed.
o
In regard to calculating system power requirements, refer to DBK Basics located near
the front of this manual.
Overview
Each DBK17 simultaneous sample-and-hold (SSH) card provides 4 channels of voltage input to a
LogBook or a Daq device system. Each of the 16 analog input channels can accept four DBK17 cards for
a maximum of 256 analog input channels. The simultaneous sample-hold function is activated at the
beginning of each channel scan and freezes all signals present on DBK17 inputs for the duration of the
scan, allowing for non-skewed readings of all channels.
A DBK17 channel should never be the first channel in a scan due to timing of the
SSH line.
DBK17 features an instrumentation amplifier for each channel, with switch-selected gains of
×1, ×10, ×100, ×200 and ×500. A socket is provided for a user-selected gain resistor for custom gain
selection instead of the unity gain (×1) setting.
Four separate sample-hold stages follow the 4 input stages. The outputs are connected to a 4-channel
multiplexer stage. The enabled-output MUX allows up to 4 DBK17s to share a common analog input
channel.
Input can be connected to a channel’s BNC connector or terminal block. The differential inputs are
provided with switchable100 K
Ω
bias resistors to analog common. User gain can be set to any value
between unity and ×500 by installing a resistor in the user-location of each channel.
DBK17 Block Diagram
DBK Option Cards and Modules
879895
DBK17, pg. 1