10
Operation
Checking the battery voltage
The constant sound pressure generator in the unit uses an electronically controlled motor
to drive a piston and create an accurate sinusoidal wave. Frequency precision is within
±1% provided that the battery voltage is between 7 volts and 10 volts. The battery voltage
monitor (LED) allows the operator to check the state of the batteries, in order to assure
correct performance.
Unit cannot
be used
Lit
Battery voltage
normal
Flashing
Battery voltage low
(Unit can still be used)
Off
When turning power to the unit on, use the battery voltage monitor (LED)
to check the state of the batteries.
If the battery voltage monitor (LED) is off, the batteries must be replaced. If the battery
voltage monitor (LED) is fl ashing, the batteries will have to be replaced soon. For infor-
mation of how to replace the batteries, see pages 8 to 9.
Battery life at room temperature (approx. 23°C) is about 2 hours of continuous use with
manganese batteries (R6P) or about 13 hours of continuous use with alkaline batteries
(LR6).