BRUEL & KJAER 2240 - Detectors

Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual20
4.10 Detectors
Display-update rates: 1 second for all measured quantities.
4.10.1 Exponential Averaging
Display-update rates: 1 second for all measured quantities.
Exponential averaging times: Fast (250 ms).
Note: The maximum response to test tone burst referred to response to continuous signal is calculated
from the formula in standard IEC 60651, Appendix C.
4.10.2 Linear Averaging
Linear averaging times: 1 second to 60 minutes, in steps of 1 second
Settling time according to IEC 60804: 0 seconds
Nominal delay time between operation of the reset facility and re-initiation of a measurement accord-
ing to IEC 61672 – 1: 0 seconds
Time interval after completion of a measurement before a reading is displayed according to
IEC 61672 – 1: <1 s
Minimum hold time according to IEC 60805: Results are held until a new measurement is initiated.
4.10.3 Peak
Peak onset time according to IEC 60651: < 100 μs
Table 4.11
Response to tone
bursts for expo-
nential averaging
detectors accord-
ing to IEC 60651
and DIN 45657.
Time
Weighting
Duration of Test
Tone Burst (ms)
Max. Response
to Test Tone
Burst referred
to Response to
Continuous
Signal (dB)
Standard
Tolerances on
Max. Response
(dB)
2240
Tolerances on
Max. Response
(dB)
Continuous 0 ±1 ±0.5
F
200 –0.98 ±2 ±1
100 –2.59 ±2 ±1
50 –4.82 ±2 ±1
20 –8.3 ±2 ±1
10 –11.14 ±2 ±1
5 –14.07 ±2 ±1
2 –17.99 ±2 ±1
1 –20.99 ±2 ±1
0.5 –23.99 ±2 ±1
0.25 –26.99 ±2 ±1