Figure 5: NiMH Battery Pack
Power Options
There are 3 options for powering the WB-300: a 9-volt alkaline battery, a NiMH (Nickel Metal
Hydride) rechargeable 6-cell battery pack, and an AC adapter. A door on the back of the instru-
ment allows the user access to the 9-volt battery. The rechargeable battery pack is located inside
of the unit. If the rechargeable battery pack ever needs to be replaced, it can be accessed by
removing the screws from the bottom panel of the unit.
The 2-position switch located in the battery compartment must be set by the user if the power
supply method is changed. The up position is for the 9-volt battery. The down position allows
for either the AC adapter or the rechargeable batteries. The AC adapter will trickle charge the
rechargeable batteries if they are in place or it will simply allow for line power operation of the unit.
9-V Alkaline Battery Replacement
The 9-volt battery should be replaced or the NiMH battery pack should be recharged when the
voltage drops below 6.4 volts. The battery voltage is displayed when the instrument is turned
on. While turned on, the battery voltage can be displayed at any time by pressing the up or
down arrow keys to move through the display until the battery voltage screen appears. If, while
operating, the battery voltage drops below 6.4 volts, the display will automatically switch to
the display showing the battery voltage along with a low battery message. After a low battery
occurs, the unit will continue to operate for approximately 8 hours. When the battery voltage
falls to 6.2 volts or below, the unit will automatically turn off.
NiMH Battery Pack
The NiMH rechargeable battery pack is charged in the instrument using 120VAC to 9VDC
adapter. A discharged battery pack requires a charge of 16 hours. Leaving the AC adapter
plugged in for extended lengths of time or when operating the instrument will not harm the
rechargeable batteries.
NiMH Battery Pack
To install, slide into case and plug in
connector as shown.
Power Options
6 Power Options
www.
GlobalTestSupply
.com
Find Quality Products Online at:
