bb090813.book : 2236-ch6 Black 4
Chapter 6 – Specifications
Specifications
6 – 4
Brüel & Kjær
Precision Integrating Sound Level Meter Type 2236
User Manual
Frequency Weighting:
Selected independently for RMS and Peak
RMS:
A, C according to BS5969 Type 1
L: As shown in Fig.6.1 with Type 1 tolerances
Filter
*
:
Band-pass Filters: Eight
1
/
1
-octave filters at
1
/
1
-
octave intervals (base 10)
Centre Frequencies: 31.5, 63, 125, 250, 500Hz,
1, 2, 4, 8kHz
Characteristics: As shown in Figs. 6.2 and 6.3
Peak:
C according to BS5969 Type 1
L: As shown in Fig.6.1 with Type 1 tolerances
Detectors:
Simultaneous RMS and Peak with independent
frequency weightings
Linearity Range: 80dB
Pulse Range: 83dB
Non-linear Distortion: Too small to affect accu-
racy
Peak Detector Rise Time: <50
µ
s
Time Weighting:
S, F according to BS5969 Type 1 (typically better
than Type 0). See Fig.6.4
Display:
4 line LCD showing:
●
Measuring range and quasi-analogue bar
showing input signal
* Only available with Types 2236 C–008 and 2236 D–008
when filter selected.
●
Battery low, pause and overload with hold in-
dicators
●
Time weighting and elapsed measurement time
●
Frequency weighting (Peak or RMS) or filter
centre frequency
†
, selected parameter with lev-
el
Back-light with switch
The quasi-analogue bar is updated 10 times per
second
Displayed parameter level updated once per sec-
ond
Exchange Rate:
3dB
Reset:
Resets Buffer (including elapsed time) to zero
Warning prior to reset if elapsed time > 1min
Reset when changing frequency or time weighting
Resets all results in Log, Memory and Buffer if
held down together with
〈
Data
〉
Optional reset when changing level of measure-
ment range
Memory:
40 Records of Overall Results
Result Logging:
L
eq
, MaxP and MaxL
Logged Every: 1, 10, 30s, 1, 5, 10, 15, 30min
or 1hour
Logged To: log or interface
† Only available with Types 2236 C–008 and 2236 D–008
when filter selected.
Fig.6.4 Response of the sound level meter to tone bursts of varying characteristics
1
10
0
–10
– 20
– 30
100
nominal
F
measured
Pulse length (ms)
t
Reading in dB referred to continuous signal level (dB)
932730e
t
4 kHz
S
