Sound Level Meter Types 2245 –
Instruction Manual
Page 59 of 110
4.10 Detectors
Display-update Rates:
L
xy
broadband bars and spectra every 0.2 s; all other spectra
and numbers every 1 s.
4.10.1 Exponential Averaging
Exponential Averaging Times: Fast (250 ms), Slow (2000 ms), Impulse (70 ms + 1500
ms hold time. constant)
Response to tone bursts for exponential averaging detectors according to IEC
60651 and DIN 45657:
Table 4.10 Response to tone bursts for exponential averaging detectors
Please note: The maximum response to test tone burst referred to response to
continuous signal is calculated from the formula in IEC 60651, appendix C.
Duration of
test tone
burst
(ms)
Maximum
response
to test tone burst
referred to
response to
continuous signal
(dB)
Standards
tolerances
on maximum
response
(dB)
Analyzer
tolerances on
maximum
response
(dB)
Continuous 0.00
200 -0.98 ±1 ±0.1
100 -2.59 ±2 ±0.1
50 -4.82 ±2 ±0.1
20 -8.30 ±2 ±0.1
10 -11.14 ±2 ±0.1
5 -14.07 ±2 ±0.1
2 -17.99 ±2 ±0.1
1 -20.99 ±2 ±0.1
0.50 -23.99 ±2 ±0.1
0.25 -26.99 ±2 ±0.1
2000 -0.63 - ±0.1
500 -4.05 ±1 ±0.1
200 -7.42 - ±0.1
50 -13.12 - ±0.1
20 -3.61 ±1.5 ±0.2
5 -8.76 ±2 ±0.2
2 -12.55 ±2 ±0.2
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