Operation - Fluke 945 User Manual

OPERATION

1. Press � button for power ON.
2. Select the desired response time and weighting. If the sound source consists
of short bursts or only catching sound peak, set response to FAST. To
measure average sound level, use the slow setting. Select A weighting for
general noise sound level and C weighting for measuring sound level of
acoustic material.
3. Hold the instrument comfortably in hand or fix on tripod and point the
microphone at the suspected noise source, the sound pressure level will be
displayed.
MIN/MAX
The MIN/MAX feature reads and updates the display to show the maximum or
minimum value measured after you press the MIN/MAX button. Each time the
button is pressed, the meter will alternate between MAX and MIN. Press the MIN/
MAX button for more than 2 seconds to disable this feature.
HOLD
Freezes the reading present on the LCD at the moment the button is pressed. To
use this button feature set up the meter for the type of measurement and range
desired before pressing the button.
Backlight
Press the button you enable the display backlight to easy readings in dark
environments. Press more than 1 second to disable backlight, which however it
automatically OFF after 15 seconds.
Calibration Procedures
Using a standard Acoustic Calibrator (94dB, 1 kHz Sine wave)
1. Set meter for dBA and FAST.
2. Insert the Microphone nozzle carefully into the insertion hole of the calibrator.
3. Press A/C button then press the HOLD button, hold the 2 buttons at the same
time more than 1 second. LCD will be blinking to confirm calibration.
4. When LCD blinked, release the A/C and the HOLD buttons. The sound level
meter will display 94.0 dBA . The calibration is done.
5. The 94 dB calibration process can be repeated until the meter reads 94.0 dB.
Recalibration cycle: 1 year.
SPECIFICATIONS
General
Display:
Microphone:
Low Battery Indication:
4 digits LCD
1/2 inch Electret condenser microphone
Replace battery when LCD displays "�"
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