8
1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz and
16kHz. Specifications of filters conform to Class 1 requirements of EN 61260:1995 and EN
61260:1995/A1:2001.
Following quantities can be measured simultaneously for each filter centre frequency (and also
for wide-band response), when one frequency weighting is selected among from three available
weightings (A, C and Z) and when one time weighting is selected among from two available
weightings (F and S):
•
L
current RMS sound level,
•
L
eq
time-average sound level.
1.4.4. Infra G filter mode
Following quantities can be measured simultaneously:
•
L
GS
current RMS, G-frequency-weighted S-time-weighted sound level,
•
L
GSmn
minimum RMS, G-frequency-weighted S-time-weighted sound level,
•
L
GSmx
maximum RMS, G-frequency-weighted S-time-weighted sound level,
•
L
IPk
current peak sound level in infrasound band,
•
L
IMPk
maximum peak sound level in infrasound band,
•
L
Geq
G-frequency-weighted time-average sound level.
1.5. Specifications
DSA-50 digital sound analyzer conforms to requirements of following standards:
EN 61672-1:2002
Electroacoustics – Sound level meters – Part 1:
Specifications.
EN 61260:1995/A1:2001
Electroacoustics – Octave-band and fractional-octave-
band filters.
ISO 7196:1995
Acoustics – Frequency-weighting characteristic for
infrasound measurements.
DSA-50 conforms to electromagnetic compatibility (EMC) requirements specified in
EN 61672-1:2002 for X group instruments.
Specifications common for all operating modes:
•
Accuracy class
1
•
Readout resolution
0.1dB
•
Maximum sound pressure level can be applied
without causing damage to the instrument
150dB (3% THD)
•
Maximum electrical voltage can be applied at
instrument electrical input facility without causing
damage to the instrument
22V
p-p
•
Capacitance of electrical input facility
18pF
•
Reference conditions:
- type of sound field
free field
- reference frequency
1000Hz
- reference sound pressure level
94dB
- reference level range:
for SLM mode
55 – 135dB
for 1/1- and 1/3-octave analyzer mode
65 – 135dB
for infra G filter mode
65 – 145dB
- sampling frequency:
for SLM, 1/1- octave and 1/3-octave mode
52.1kHz
for infra G filter mode
17.4kHz