Specifications 2236 – Atec Bruel-Kjaer-2236 User Manual
Page 3
3
STANDARDS:
Conforms with IEC 651 (1979) and 804 (1985)
Type 1, and ANSI S1.4 – 1983 and Draft S1.43,
6th September, 1992 Type 1
1
/
1
-octave filter set conforms with IEC 225 – 1966
and ANSI S1.11–86, order 3, Type 1–D (Types
2236 C and 2236 D only)
MEASURING RANGES:
NOISE FLOOR:
Typically: 18 dB(A)
Maximum: 20 dB(A) RMS
Includes preamplifier’s electrical noise and mi-
crophone’s thermal noise
DETECTORS:
Simultaneous RMS and Peak with independent
frequency weightings
Linearity Range: 80 dB
Pulse Range: 83 dB
Non-linear Distortion: Too small to affect ac-
curacy
Peak Detector Rise Time: <50
µ
s
FREQUENCY WEIGHTING:
Selected independently for RMS and Peak
RMS:
A, C according to IEC 651 Type 1
L: flat from 10 Hz to 20 kHz (
±
2 dB) with Type 1
tolerances
Peak:
C according to IEC 651 Type 1
L: flat from 10 Hz to 20 kHz (
±
2 dB) with Type 1
tolerances
FILTER (only available with Types 2236 C and
2236 D):
Band-pass Filters: Nine
1
/
1
-octave filters at
1
/
1
-octave intervals (base 10)
Centre Frequencies: 31.5, 63, 125, 250,
500 Hz, 1, 2, 4, 8 kHz
Maximum Noise Floor in Each Frequency
Band:
See diagram for details
* Only available with Types 2236 C and 2236 D when
filter selected.
Level non-linearity caused by noise floor is < 0.4 dB at
30 dB(A) (re IEC 651) and < 1 dB at 26 dB(A)
† Level non-linearity caused by noise floor is < 0.4 dB at
30 dB(A) (re IEC 651) and < 1 dB at 26 dB(A)
Range
(dB)
Max.
Peak
level
Upper limit (RMS) for
signals with crest
factor = 10 (20dB)
10
*
– 90
93
73
20
†
– 100
103
83
30 – 110
113
93
40 – 120
123
103
50 – 130
133
113
60 – 140
143
123
TIME WEIGHTING:
according to
IEC651
Type 1
DISPLAY:
4 line LCD showing:
• Measuring range and quasi-analogue bar
showing input signal
• Battery low, pause and overload with hold in-
dicators
• Time weighting and elapsed measurement
time
• Frequency weighting (Peak or RMS) or filter
centre frequency (only available with Types
2236 C and 2236 D), selected parameter with
level
Optional back-light
The quasi-analogue bar is updated 15 times per
second
Displayed parameter level updated once per sec-
ond
PARAMETERS:
Common (and UKi only): MaxL, MinL, MaxP,
Peak, SPL, L
eq
, SEL, L
EP,d
and Overload in %
of measurement time
Specific:
Resolution:
L
N
Values: 0.5dB
Other Parameters: 0.1dB
EXCHANGE RATE:
RESET:
Resets Buffer (including elapsed time) to zero.
Warning prior to reset if elapsed time > 1 min.
Reset when changing frequency or time weight-
ing
Resets all results in Log, Memory and Buffer if
held down together with
〈
Data
〉
Optional reset when changing level of measure-
ment range (L
N
s not available if range change
is without reset)
MICROPHONE:
Type 4188 prepolarized free-field
1
/
2
″
condenser
microphone
Sensitivity: – 30 dB re 1 V/Pa
±
2 dB
Frequency Range: 8 Hz to 12.5kHz
±
2 dB
Capacitance: 12 pF
MEMORY:
40 Records of Overall Results
RESULT LOGGING:
Logged To: log or interface
Memory Capacity: 128 Kbytes (Types 2236 A
and 2236 C). Equivalent to 21600 sets of results
(for example, 6 hrs of 1s logging).
512Kbytes (Types 2236 B and 2236 D). Equiv-
alent to 86 400 sets of results (for example,
24 hrs of 1s logging)
SERIAL INTERFACE:
Compatible with EIA–574
Compatible with EIA– 232 – E with 25-pole adap-
tor
Baud Rate: 1200 – 19 200 (1200 – 9600 for
Japanese version)
Data Bits: 8
Stop Bit: 1
Parity: None
Handshake: Hardwire, XON/XOFF or None
Heading: Long or short (only short for USA
model)
DC OUTPUT:
Short-circuit protected coaxial LEMO socket (se-
ries 00)
* only L
eq
logged at this rate
Int.
USA
UKi
UKe
Jap.
S, F, I
S, F, I
S, F
S, F, I
S, F, I
Int.
USA
UKe
Jap.
L
Im
✓
✓
✓
✓
Inst.
✓
IEL
✓
✓
✓
LAE
✓
LCE
✓
LLE
✓
L
AV,4
✓
L
AV,5
✓
✓
Variable L
N
✓
✓
✓
Defaults
(fixed for
Int. Version)
L
95
L
5
L
90
L
50
L
10
L
90
L
50
L
1
L
95
L
50
L
5
Int.
USA
UKi
UKe
Jap.
3
3, 4, 5
3
3
3, 5
Int.
USA
UKi
UKe
Jap.
L
eq
L
eq
L
eq
L
eq
L
eq
MaxL
L
10
MaxL
L
10
L
5
MaxP
L
90
MaxP
L
90
L
95
Log
Rate
Log
Cap.
Int.
USA
UKi
UKe
Jap.
0.1 s
*
36 m
✓
✓
✓
1 s
6 h
✓
✓
✓
✓
✓
10 s
2
1
/
2
d
✓
✓
✓
✓
30 s
7
1
/
2
d
✓
✓
✓
1 m
15 d
✓
✓
✓
✓
✓
5 m
75 d
✓
✓
✓
10 m
150 d
✓
✓
✓
✓
15 m
225 d
✓
✓
✓
30 m
450 d
✓
✓
✓
✓
60 m
900 d
✓
✓
✓
✓
Result
Output
Formats
Int.
USA
UKi
UKe
Jap.
Overall
✓
✓
✓
✓
✓
Logged
(Printer)
✓
✓
✓
✓
✓
Logged
(2318)
✓
✓
✓
✓
✓
Logged
(Spreadsheet)
✓
✓
✓
✓
✓
Level
Distribution
✓
✓
✓
Cumulative
Disribution
✓
✓
✓
Distribution
Resolution
(dB)
1 or 5
1 or 5 0.5, 1,
2, 5,
10
Specifications 2236
941683e
25
Noise/dB
Frequency Hz
31.563 125
8 k
C
A
LIN
20
15
10