User manual

DBK18 4-Channel Low-Pass Filter Card
Overview ...... 1
Hardware Setup ...... 1
Card Connection ...... 1
Card Configuration ...... 2
CE Compliance ...... 3
DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration ...... 3
DaqBook/2000 Series and DaqBoard/2000 Series Configuration ...... 3
Configuring DBK18 Filter Sections ...... 3
Software Setup ...... 5
DBK18 – Specifications ...... 6
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 DBK18 low-pass filter (LPF) card provides 4 input channels to a LogBook or a Daq device system.
Each of sixteen channels can accept four DBK18 cards for a maximum of 256 analog inputs. The input
connectors are BNC type connectors. The differential inputs are provided with switchable 100 KΩ bias
resistors to analog common.
The DBK18 features an instrumentation amplifier for each channel, with switch-selected gains of
×1, ×10, ×100, ×200 and ×500. A socket is provided for a gain resistor for custom gain selection instead
of unity gain (×1). Gain for any channel can be set to any value between unity and ×500 by installing an
appropriate resistor. Four separate filter stages follow the 4 input stages. The outputs are connected to a
4-channel multiplexer stage. The enabled output MUX allows up to four DBK18s to share a common
analog base channel.
Amplifier
SW5
BNC
CH 1
CH 2
CH 3
CH 0 (1 of 4 identical channels)
Switchable
bias resistors
(per channel)
a
f
LPF
Low-Pass
Filter
Gain-Select Switches
SW1-SW4
P1
Channel address lines
MUX
2
2
16
J1 Output channel
selection header
Card Address
recognition stage
EN
BY
Filter-Bypass/
Enable Jumpers
J3-J6
Board-Select
Switch
SW6
DBK18 Block Diagram
Terminal
Block
+
_
Hardware Setup
Card Connection
The DBK18 is equipped with BNC connectors for easy access to all of the analog inputs. Connections are
provided for 4 differential inputs. The card also includes a terminal block as a connection-option to the
BNC connectors.
Note: New versions of the DBK18 have been enhanced by the addition of a terminal block. The BNC
connectors are still usable, and board functions have not been changed.
DBK Option Cards and Modules 918894 DBK18, pg. 1