Instruction manual

Outline

The Sound Level Meter NA-42/NL-52 allows the following quantity mea-

surements.

Main processing

Simultaneous measurement of all items with selected time weighting (F,

S) and frequency weighting (A, C, Z) characteristics

Sound level L

Equivalent continuous sound level L

Sound exposure level L

Maximum sound level L

max

Minimum sound level L

min

Percentile sound level L

(1 to 99) 1-increment steps,

max. 5 values, calculated from

or L

eq,1sec

Additional processing

One of the following measurements can be selected for simultaneous

processing with main processing.

Equivalent continuous C-weighted sound level

Ceq

C-weighted peak sound level L

Cpeak

Z-weighted peak sound level L

Zpeak

Impulse equivalent continuous sound level

AIeq

Tact-max A-weighted sound level L

Atm5

(When the optional Extended Function Program NX-42EX is not installed,

AIeq

and L

Atm5

cannot be measured.)

The following options are available separately, to further enhance the

range of applications for the product.

Printer DPU 414

For producing hard copy of measurement data (including stored

memory data).

Level recorder LR-07, LR-20A (No CE)

For recording sound level changes over time.