LOKAL 400 Operating Manual
Page 20
microphone is displayed. Amplification can be adjusted by turning the dial or by drawing the scale bar with a
finger on the touch screen to the requested sensitivity level.
You have set the optimal sensitivity level as soon as the control bar (2) displayed in the left part of the window
levels out at about 50%.
Pressing the dial or pressing the Amplification icon again activates the set amplification level.
TIP:
If the amplification menu is called and if this
button is pressed for a little while, the LOKAL 400 system
will choose the optimal amplification level automatically. As soon as the operator hears several beeps while the
button is pressed, the button can be released and the system will choose the most suitable amplification level.
ATTENTION: the sensor has to be positioned at the spot where the noise is to be picked up.
NOTE:
As soon as the sensitivity level is changed, the current measurement series will be deleted !
8.1.2 Setting the sensor selection (filter pre-settings)
The system offers three pre-defined filter settings for acoustic leakage detection. In addition, every filter
range can be changed individually during a measurement procedure:
If you wish to select any of the three pre-defined filter settings, please navigate in the measurement
indication window to the filter mode symbol (1), activate the symbol, and confirm your selection. The
window where the filter pre-settings can be selected will open up now.
Three pre-settings are available:
Fittings (2)
A frequency range of 0 to 2,000 Hz is pre-defined, with a high-pass filter of 200 Hz and a low-pass
filter of 800 Hz. This setting is optimal for listening to fittings and hydrants.
Ground (3)
A frequency range of 0 to 1,000 Hz is pre-defined, with a high-pass filter of 50 Hz and a low-pass
filter of 400 Hz. This setting is optimal for listening to surfaces.
Operator (4)
This pre-setting uses the filter range you have pre-set according to your personal filter preferences in the
settings menu at
Frequency range Geophone
(see Chapter 6.3.5).
The system comes with a standard
pre-set frequency range of 0 to 1,250 Hz, with a high-pass filter of 100 Hz and a low-pass filter of 800 Hz.
The pre-set filter frequencies can be adjusted individually anytime and in any measurement mode
between the single acoustic leakage detection measurements. For further information, please refer to the
instructions as stated in Chapter 8.4.
NOTE:
As soon as the filter setting is changed, the current measurement series will be deleted !
8.1.3 Adjusting the volume
You can adjust the volume for the headphones subject to the pre-set hearing protection level
(see
Chapter 6.4.6.)
.
The currently set volume is indicated numerically and also as a bar chart in the symbol for the headphone
volume setting (1) located in the measurement indication window.
