Casella-cel CEL24X Uživatelský manuál stáhnout pdf (Strana 11)

C. MEASUREMENT RANGE (30 – 100dB or 60 – 130dB)

Care

should

taken

select

the

correct

measurement

range depending

the

noise

clim ate

being

measured. Make sure the noise being measured is

within the range selected. If the Over Range indicator (

) is displayed the

incorrect range has been selected. (Refer to Figure 7 [C]). If the noise level is

lower than the selected measurement range ‘--.-dB’ will be displayed.

D. TIME WEIGHTINGS

FAST - Use this setting for comparatively stable noise.

SLOW - Use this setting for noise with a slow variation.

IMP (Impulse) - Use this setting for noise with rapid variation and impulsive

noise.

Note: If unsure please refer to your local legislation and application

standards.

E. FREQUENCY WEIGHTINGS

Frequency

weightings

are

used

represent

the

human

ears response

noise.

A WEIGHTING - Make this selection for general noise measurements.

C WEIGHTING - Make this selection for very high noise levels.

Note: If unsure please refer to your local legislation and application

standards.

F. AVERAGE SETTING (CEL-244/246 ONLY)

The parameter to measure average noise can be set to Leq or Lavg. This is

dependent on local legislation which sets the exchange rate (Q) to either 3

or 5 respectively. The Q value determines the increase in dB associated

with the doubling of risk to hearing damage. Q=3 means that the increase in

hearing damage risk doubles every 3dB increase in noise, respectively Q=5

means that risk to hearing damage doubles every 5dB increase in noise

level. Use Leq (Q=3) for EU based workplace noise regulations and Lavg

(Q=5) for US/OSHA based noise legislation.

Note: If unsure please refer to your local legislation and application

standards.

G. LOGGING INTERVAL SCREEN (CEL-246 ONLY)

In Figure 8 (C), the currently selected logging interval is displayed and is

also shown above the Right key (B). Press the Right key (B) to change the

logging interval. Press Left key (A) to exit the settings menu and return to

the measurement screen.

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