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When on the measurement screen, settings can be changed using the left key (settings
button)
(Figure D.7). Once pressed, an arrow will appear next to the settings
button
to show you are in the settings menu. Consecutively pressing the
left button will cycle through setting screens. Pressing the right key will make changes to
the current selection. Current settings are saved when switched off.
1. Time weightings (Fast, Slow or Impulse)
2. Measurement range (30-100dB or 60-130dB)
3. Frequency weightings (A or C)
4. Display type, either bargraph or time history graph (1 or 5 minute time base)
Time weightings:
Use Fast response for comparatively stable noise, or select Slow
response for slowly varying noise. Impulse response may be
selected for more rapidly varying and impulsive noise.
Measurement range: Care should be taken to select the correct measurement range
depending on the noise climate being measured. Ensure the noise
being measured is within the measurement range such that the over
range indicator
below the measurement range are displayed as '--.-dB'
Frequency weightings:Frequency weightings are used to represent the human ears
response to noise. The 'A' weighting is typically used for general
noise measurements. 'C' weighting is used at very high noise
levels.
Display type:
The main display can be changed between a bargraph (Figure D) to
a time history display (Figure J). The time history shows how the
maximum sound pressure has varied through either a 1 minute or 5
minute time base. Press the right key to select the bargraph
, 1 minute
the left key
measurement screen.
Configuration Menu
The configuration menu is used to make changes to three specific settings:
• Display contrast
• Calibration level
• Signal input source
To enter the configuration menu, hold down the right key when the CEL-240 is switched
off and press the 'power' key. The 'Contrast' screen is then displayed (Figure G). Press
the right key
to adjust the contrast as appropriate and then press the left
to accept the changes.
is not displayed (Figure D.2). Noise levels
, or 5 minute time history
to confirm the changes and return to the
. Press
key
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