Wahl 392M, Instruction Manual

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2.4 The Batteries
The 392HP, 392E, 392EX, 392M, and 392MX HEAT-Prober are powered with
five size AA rechargeable nickel-cadmium batteries, 1.2 volts each. The total
capacity is 650 milliampere hours at 6.0 volts. The display demands the
largest power drain. Depending on the number of digits being displayed, the
batteries can power the instrument for a minimum of 5 hours or for as long
as 8 hours.
The 392EVX and 392VX meter utilizes an LCD type display to conserve bat-
tery life. Battery life is in excess of 50 hours of continuous use.
SPECIAL NOTE: Rechargeable batteries should be kept at full charge. On the
shelf, they will gradually discharge, losing about 10% per week. If the battery
fails to respond to recharge, provisions have been made for ease of replace-
ment. Open the back cover, and disconnect from the instrument by means of
the Molex connector. Replace with Wahl Model Number 11681-1 or 11681-2
(See Figure 2-2). Model 392EVX and 392VX incorporates a LCD display and a
standard 9V battery capable of 50 hours continuous operation.
2.4.1 Recharging
To recharge the batteries, use the recharger supplied. Plug in directly to
115VAC, 60 cycle wall plug and insert jack into socket on left side of HEAT-
Prober. (For overseas 220-volt lines, use a Franzus converter adapter with the
recharger supplied or request a 220 volt recharger.)
2.4.2 Continuous Operation
The 392HP, 392E, 392EX, 392M, and 392MX, HEAT-Prober can be continu-
ously operated by using a battery recharger to restore or recharge the batter-
ies as rapidly as they are depleted.
NOTE: The instrument cannot rectify AC current. A DC charger with open cir-
cuit voltage of 9.0 volts and approximately 120 milliamperes will maintain the
battery charge. This occurs when the switch is on and the instrument is
operating. Do not connect a voltage source to the batteries unless its current
is limited to 120 milliamperes.
The MA-150 recharger will charge the batteries with the switch “OFF”, or
make-up battery drain if the instrument is operating. The recharger supplied
with the instrument will enable continuous operation without draining the
batteries.
Figure 2-2. 9V Battery Compartment (top picture); Rechargeable Battery
Pack Compartment (bottom picture).