Circuit-test DMS-4420, Руководство пользователя

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CIRCUIT-TEST
DMS-4420
DMS-4420
8
the HOLD buttons. The sound level meter will
display 94.0 dBA when the calibration is done.
5. The 94 dB calibration process can be repeated until
the meter reads 94.0 dB. Recalibration cycle:1 year.
4. MEASUREMENT PREPARATION
1. Battery Loading
Remove the battery cover on the back and put in
one 9V Battery.
2. Battery Replacement
When the battery voltage is low, the following
symbol appears; this indicated that the battery
needs to be replaced.
5. OPERATING PRECAUTIONS
1. Air blowing across the microphone can cause noise
and interference when using the instrument in
windy environments, use the windscreen to reduce
noise.
2. Calibrate the instrument before operation if the
instrument was not in use for a long time or
operation at bad environment.
3. Do not store or operate the instrument in a high
temperature or high humidity environment.
4. Keep microphone dry and avoid severe vibration.
5. When the instrument is not used for an extended
period of time, remove the battery and store the unit
in a low humidity environment.