Measurement Computing WaveBook rev.5.3 - Manual (Page 56)

DBK34A Vehicle UPS/Battery Module
DBK34A is similar to DBK34 in appearance and operation; but there are differences.
Before proceeding with this section, verify that your device is a DBK34A. If your device
does not have the “A” suffix, use the preceding section regarding the DBK34 Vehicle UPS
Module instead of this section.
DBK34A Front Panel
The DBK34A can power a data acquisition system in portable or in-vehicle UPS applications (both 12 V
and 24 V systems). Power storage capacity is 5 A-hr @ 12 VDC or 2.5 A-hr @ 24 VDC.
For reliable data acquisition in a vehicle, the DBK34A provides clean and consistent operating power:
• Prior to engine/generator start
• During engine start-up (battery sag due to the high-current demand of starter motor and solenoid)
• After engine turn off.
• Before and after connection to the vehicle
The DBK34A contains two sealed-lead rechargeable batteries (Gel-Packs), associated charging circuits and
current indicators. Typically, these batteries can last more than 500 full cycles and up to 10 years standby
lifetime at room temperature. Recharging is fast, and extreme temperature performance is good. The
DBK34A can be used with the LogBook, DaqBook, WaveBook, and related DBKs and WBKs. The unit’s
rugged metal package has a compatible 8×11” footprint for convenient stacking with Velcro tabs and
optional splice plates and handles for carrying.
Main and auxiliary power input comes from 12 or 24 VDC via a terminal block on the unit’s front panel
(12 or 24 V modes are set by front-panel jumpers). Automatic, temperature-compensated charging circuits
recharge the internal batteries quickly and safely. For trouble-free operation, you must fully charge the
batteries before use. The charged battery runtime will depend on the load and mode of operation.
During use of the internal batteries, the Charging LED blinks and a beeper sounds when battery life is
almost exhausted. Within a few minutes, internal cutoff circuits disconnect the load from the batteries to
prevent the possibility of deep-cycle damage.
Note: Current protection is provided by four fuses. Two 7.5A fuses for the unit’s internal batteries,
one 7.5 A fuse for an auxiliary (external) battery, and a 15 A fuse for the power input.
You can use a CA-172 cable to connect a vehicle battery (via a cigarette lighter) to the
DBK34A terminal board. The cable is six feet long, contains a cigarette lighter adapter at one
end, and stripped leads (for terminal connection) at the other.
For trouble-free operation, fully charge the batteries before use. Charged
battery runtime depends on the load and on the mode of operation.
2-36 System Setup and Power Options 979194 WaveBook User’s Manual