Measurement Computing Daq PC-Card - Manual (Page 30)

2-8 10-18-00 DaqBook / DaqBoard [ISA] / Daq PC-Card User’s Manual
Device specific information regarding system setup and expansion can be found in the Daq hardware
chapters and in the DBK chapter. You may need to read the DBK10/41/60 sections for system expansion
and the DBK30A/32A/33 and the CDK10 sections for power management.
Since DBK modules are controlled by the Daq sequencer, external channels can be scanned at the same
high speed as internal channels. Each main (base) channel can support up to 16 sub-channels and thereby
provide expansion up to 256 input channels. DBK cards and modules can be daisy-chained off the P1
connector of the Daq or expansion module. DBKs add another level of multiplexing and programmable
gain to each channel. Setting up channel parameters often requires both hardware and software setup.
Modules for packaging DBK expansion cards are available with 3 slots (DBK10) or 10 slots (DBK41)—
some DaqBooks also have expansion slots. The best option depends on the number of DBK cards in your
system. For just a few cards, use the stackable 3-slot DBK10 low-profile expansion enclosure. For more
than six cards, use the 10-slot DBK41. Multiple DBK41s can be daisy-chained to handle a large number of
DBKs in a system. For termination panel connections, use the DBK60 expansion chassis or DaqBook/260,
which is a combination of the DaqBook/200 and DBK60.
Additional power supplies (essential with the Daq PC-Card) may be needed to handle the load. The DBK
power options accommodate a wide range of applications from laboratory to automotive and other field
applications. The power systems can use any 10 to 20 VDC source or an AC source with the included
adapter. For portable applications, the compact DBK30A rechargeable power supply can provide power to
the DBK10 or DBK41. The DBK30A also includes a 28 V output for powering 4 to 20 mA transducers.
For applications with many DBK cards (initially or in future expansion), the DBK32A or DBK33 can be
installed into any expansion slot. The DBK32A provides ±15 VDC and the DBK33 provides ±15 VDC
and +5 VDC.