Instruction manual

121
Speci cations
Measurement range A-weighting: 25 dB to 130 dB
C-weighting: 33 dB to 130 dB
Z-weighting: 38 dB to 130 dB
C-weighted peak sound level: 55 dB to 141 dB
Z-weighting peak sound level: 60 dB to 141 dB
Inherent Noise NL-42 NL-52
A-weighting: 19 dB or less 17 dB or less
C-weighting: 27 dB or less 25 dB or less
Z-weighting: 32 dB or less 30 dB or less
Total range 25 dB to 138 dB (A weighting, 1 kHz)
Linear operating range
All-pass (A-weighting) 113 dB
Measurement frequency range
20 Hz to 8 kHz (NL-42)
20 Hz to 20 kHz (NL-52)
Reference frequency 1 kHz
Reference sound pressure level
94 dB
Frequency weighting A, C, Z
Time weighting F (Fast), S (Slow)
Bar graph display range
Max. 110 dB (20 to 130 dB)
Bar graph range switch
Upper and lower limits of the bar graph can be set in
increments of 10 dB.
Display full scale Upper limit of bar graph display
RMS detection circuit
Digital processing method
Sampling interval L
p
, L
eq
, L
E
, L
max
, L
min
, L
peak
: 20.8 µs
(Sampling frequency: 48 kHz)
L
N
: 100 ms