Measurement Computing LogBook Series - Manual (Page 70)

pg. 16, DBK Basics 967794 Daq Systems
Power Requirements
The improper use of power can cause system damage. The following terms are important in regard to
understanding your system’s power needs.
• Supply power for signal conditioning type DBKs comes from a primary acquisition device,
such as a DaqBook/2000 Series device or LogBook, or from a power card or module. If
needed, the DBK32A or DBK33 can provide additional power to meet DBK power demands.
The DBK power supplies work off of low-voltage DC that can come from an AC adapter or
from a DC source, such as a car battery.
• Demand for power comes from DBK cards and modules [and in some systems, from
transducers]. You should use the DBK Power Requirement Worktable to calculate your
system’s power needs. After completing the table, compare the total power demand to the
supply power.
• Distribution of power to most DBKs is via the P1 interface. The DBK41 expansion chassis
has a jumper to isolate +5 VDC power from P1. The P1 Pin designations are as follows:
Pin 1: +5 VDC
Pin 2: -15 VDC
Pin 21: +15 VDC
Pin 7: digital ground
Pin 28: analog ground
Pin 29: analog ground
Note: Certain DBK modules have their own internal power supplies and require only 10 VDC to 20 VDC.
LogBook
The LogBook [with no DBKs attached] uses approximately 12 Watts of power. If using battery-power, you
can compute operational endurance from your battery’s watt×hr rating and the following calculation tables.
DaqBoard/2000 Series Boards
DaqBoard/2000 Series and cPCI DaqBoard/2000c Series Boards use 3.5 watts of power
(700 mA @ 5 VDC) from their host computer. Power consumption can be up to 10 W with external
accessories.
Avoid power cycling the host PC. Wait 10 seconds after powering down the host PC before powering it
back on. This will allow any residual voltages to decay enabling the DaqBoard/2000 Series or /2000c Series
board to start up in a known good state.
DaqBook/100 Series & /200 Series, DaqBoard [ISA], and Daq PC-Card
If using power from AC mains (through adapter), you need not worry about Daq device power use. If using
battery-power, you can compute operational endurance from the battery’s watt×hr rating and power tables.
Daq PC-Card and DaqBoard use power from their host PC.
DaqBook/100 and DaqBook/200 Series devices use no power from the PC, but do require DC voltage from
an AC-to-DC adapter, or another suitable source. Voltage needs are as follows:
• +7 to +20 VDC for DaqBook/100, DaqBook/112, and DaqBook/120
• +10 to +24 VDC for DaqBook/216
• 9 to +18 VDC for DaqBook/200 and DaqBook/260.
Various AC adapter models support power grids of USA, Europe, Japan, and Asia.