Measurement Computing DaqBook 2000 Series - Manual (Page 70)

8-8 Taking Measurements 898695 DaqBook/2000 and DaqOEM/2000 Series
Counter Input Channels (CTR0, CTR1, CTR2, CTR3)
DaqBooks and DaqOEMs have counter input capabilities and have the ability to read counter input
providing that the counter channel is not configured for synchronous acquisition. As in the case of
synchronous operations the four 16-bit counter input channels can be used individually or cascaded into
two 32-bit counter channels. For either cascaded or non-cascaded counter channels each channel can be
configured for:
• Clear on Read Mode - specifies that each counter should be cleared (reset to 0) upon being read.
• Continuous Totalize Mode – specifies that each counter is to free-run and not be cleared during
the read operation.
Using DBK Cards and Modules for Signal Conditioning
The DBK signal-conditioning cards and module are designed for use with DaqBooks, LogBooks, and
various types of data acquisition boards, i.e., ISA, PCI, and compact-PCI types. The DBKs perform best
when used with an acquisition device [such as a DaqBook] that can dynamically select channel, gain, and
range. DBK cards and modules with dynamic channel and gain/range selection allow for high channel-to-
channel scan rates with a variety of transducers.
Note: Only passive DBKs, such as the DBK1 BNC module, the DBK11A screw terminal card, and the
DBK40 BNC analog interface, can be used with Daq PC-Cards.
DBK output signals can be bipolar, e.g., -5 to +5 V, or unipolar, e.g., 0 to 10 V. The user can select a
range of relevant values to correspond to the lowest signal (e.g., -5 or 0 V) and the highest signal (e.g., 5 or
10 V) signal. This type of range selection guarantees the highest resolution in 12-bit or 16-bit conversion.
DBK modules share the same footprint as DaqBooks and approximate the footprints of many notebook
PCs. The footprint factor allows for convenient stacking. The majority of these modules have their own
power supply; however, several options exist for packaging and powering the DBKs.
Reference Note:
DBK options are detailed in the DBK Option Cards and Modules User’s Manual
(p/n 457-0905). As a part of product support, the manual is automatically loaded onto your
hard drive during software installation. The default location is the Programs group, which can
be accessed through the Windows Desktop. A PDF version of the document can be read
directly from the data acquisition CD via the introduction screen’s button.