Casella-cel CEL-393 Manual do Utilizador descarregar pdf (Página 70)

15. After the delayed start has been reached, the first L

index

(calculated for the period between 6.00 and 7.00 am) may be

obtained by pressing 4M (sequence for L

16. Press M to obtain the second L

sample.

17. Press M again to obtain subsequent samples.

If the instrument is collected on the day after the measurements were

taken, only the first 18 answers from the L

memory will be required.

The calculation of the full L

18 hour index is achieved by adding them

together arithmetically and then dividing the sum by 18.

If necessary, the period L

max

, and L

answers may also be

accessed by keying in the relevant codes (1M, 0M, 5M, and 6M respec-

tively).

All results may be hand written on pre-printed report sheets (SP0884),

or if the CEL-393B with built in interface is used, they can be printed

automatically using the CEL-238, CEL-338 and CEL-438 Digital Proces-

sor/Printer.

Switch the instrument off when all relevant answers have been obtained.

6.3 Event Mode

This mode is used for measuring peak air over-pressures that occur at

comparatively random intervals in sensitive locations, where possible

claims for noise nuisance may occur.

Requirement:

Monitor peak levels around a site where quarrying operations and

blasting take place.

Proceed as follows.

/66.

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Casella-cel CEL-393 Manual do Utilizador Página 70