Measurement Computing WaveBook rev.3.0 - Manual (Page 85)

WaveBook User’s Manual, 6-21-99 System Power & Assembly 4-1
System Power & Assembly 4
Power Management…… 4-1
Calculating the System Power Requirement…… 4-1
CA-115 & CA-116 Power Cable Connections…… 4-3
DBK30A - Rechargeable Battery Module…… 4-4
Hardware Setup…… 4-5
DBK30A - Specifications…… 4-6
DBK34 - Vehicle UPS Module…… 4-7
Hardware Setup…… 4-8
DBK34 - Specifications…… 4-9
Stacking Modules…… 4-10
Power Management
The power supplies that can be used with the WaveBook are listed in the following table.
WaveBook Product Power Supplies
Item Name/Description Capacity
TR-40U AC Power Adapter (shipped with WaveBooks & WBK Modules) 90-264 VAC input;
2.50 A @ 15 VDC
DBK30A Rechargeable Battery/Excitation Module (optional) 12-14 VDC, or 24-28 VDC
3.4 A-hr @ 14 VDC
DBK34 Vehicle UPS (Uninterruptable Power Supply) Module (optional) 12 VDC, or 24 VDC
5.0 A-hr @ 12 VDC
Other 10 to 30 VCD source, such as a car battery. Depends on source
Calculating the System Power Requirement
CAUTION CAUTION CAUTION CAUTION
An incorrect use of power can damage equipment or affect performance.
It is important to supply your system with adequate, reliable power. For this reason, you need to know your
system’s power requirement. Computing power use is also important when using batteries to power
modules, as you will need to know a safe runtime before recharging is required.
The following statements relate to system power. They should be reviewed before
proceeding.
• Higher voltages draw fewer Amps for the same power.
Remember: Watts = voltage x current (W = E*I).
• The TR-40U power adapter provides power that is sufficient for the WaveBooks
and WaveBook modules. You do not need to make power requirement calculations
unless you intend daisy-chaining units, or you have a critical battery runtime.
• When using a TR-40U power adapter in daisy-chain scenarios, you may need to use
an additional power source. This will certainly be true with systems that draw more
than 2.5 amps.
• Do not overload your power supplies.
• Current drawn from other sources, such as car batteries, can be estimated from the
following current requirements table.
The following table lists amperage requirements for WaveBook products. Use the current requirements and
worksheet tables to calculate your system’s total power requirement. Take the appropriate amperage values
from the first table to fill in the second table; and perform the indicated multiplication and addition
operations to calculate the amperage for all units in your system.