For electrical
calibration
of
the
Type
2230
and
connected
instruments
such as
chart
or
tape
recorders, a ref-
erence oscillator is built-in.
The
sensi-
tivity
adjustment
of
the
Type
2230 is
made using
the
potentiometer
located
on
the
side
panel
Reset
The
instrument
is
reset
completely
either
by pressing
RESET
"All" or
when changing
the
measurement
range.
When
the
instrument
is
reset
manually, two
types
of
resetting
are
possible: a
reset
of
the
complete in-
strument
, or a reset of
the
max.
and
min. detectors, i.e.
without
interrup-
tion of Leq
and
LEA
,T
measurements.
MEASURING RANGE:
Measuring Range
Lower limit
Max.
Upper limit
FSD
1
for SIN
~~~=~
for signals of
ratio >
5dB
~;~s~;~~~)3
(A-weighting)
70
24
83
63
80
24
93
73
90
30
103
83
100
40
113
93
110
50
123
103
1202
60
133
11
3
~~~2
70
143 123
80
153
133
1
FSD on
quasi
analogue display
2
On
ly
with
attenuator
ZF 0020
employed
3 Values
may
diverge
slightly
from
nominal
value
de-
pending on mi
cropho
ne Ko
factor
FREQUENCY RESPONSE:
See
Figs.3 and 4
FREQUENCY
WEIGHTING:
A, C weighting
to
I
EC
651
Type 1
Linear
(20
Hz
-
20
kHz)
All-pass
(1
0
Hz
-50 kHz)
DETECTOR:
Characteristics:
RMS, peak
Linearity
range:
70
dB
Pulse range:
73
dB
Crest
factor
capability:
13
dB at
FSD
TIME WEIGHTING CHARACTERISTICS:
"1":
to IEC
651
Type 1
"F":
to
IEC
651
Type 1
"S":
to IEC
651
Type 1
"Peak":
rise time <
50
JJ.S
Max.
Hold
decay
rate: 0
dB/s
(digital)
Leq
RESPONSE TIME
FOR
CONSTANT
INPUT SIGNAL:
1 s after reset
MAXIMUM MEASUREMENT PERIOD:
Only limited
by battery life
DISPLAY:
Digital:
4 digits 7 segments, liquid crystal,
8 mm high, resolution
0,1
dB
Quasi-analogue:
60
dB scale with 2 dB reso-
lution for monitoring current SPL
Pause
A pause function allows exclusion of
unwanted
noise events from Le
q'
LEA
,T
or Max./Min.
measurements.
The
Pause
function also
permits
spatial
averaging of
the
SPL.
Power
supply
The
power is
supplied
from 4 alka-
line cells (IEC
LR
6)
which will pro-
vide
approximately
8
hours
of
contin-
uous operation. A warning is displayed
when
the
batteries
are
low. Alterna-
tively,
the
Mains
Power
Supply
and
Charger ZG 0254 (option), including a
drawer with rechargeable cells,
can
be
used. ZG
0254
can
power
the
Sound
Level
Meter
and
recharge
the
cells si-
multaneously.
Specifications 2230
Additional
functions:
Overload occurring: t
Overload has occurred:
..
Battery near low level:
BAT
flashing
Battery
low level:
BAT
(flash.) t (non-reset.)
illegal setting: t
AC
OUTPUT:
1 V RMS
for
full scale, output impedance
~
120
n,
short circuit protected, mini-jack
socket
DC
OUTPUT:
3 V for full scale, 0 V bottom scale,
50
mV/dB,
output impedance
~500
n, short circuit
pro-
tected, mini-jack socket
RESET FUNCTION:
Automatic reset all occurs when changing
FSD
setting.
Reset all:
Max./min
. detectors,
Leq•
LeA
,T and
overload detector are reset
Reset
max./min.:
Only max./min detectors
are reset
MICROPHONE:
Type:
112
inch B & K Prepolarized Condenser
Microphone Type 4155
Sensitivity:
50
mV /Pa
Capacitance:
15
pF
Windscreen
effect:
< 0,9 dB up to
10kHz
CALIBRATION:
Acoustical:
With Sound Level Calibrator
Type
4230
or
Pistonphone Type 4220 by po-
tentiometer adjustment
Electrical:
With internal reference source by
potentiometer adjustment
REFERENCE
CONDITIONS
FOR
ACOUSTICAL CALIBRATION WITH
TYPE
4230:
Type
of
Sound
Field:
Free
Reference
Incidence
Direction:
Perpendicu-
lar to microphone diaphragm
Reference
SPL:
94
dB (re
20
JJ.Pa)
Reference Frequency: 1 kHz
Reference
Temperature:
20
°C
Reference
Measuring
Range:
11
0 dB
FSD
Fi
g.
8.
Field Meas
urin
g Set
WARM-UP TIME:
<
5s
for 0,5dB; <
10s
for
0,1
dB
EFFECT
OF
HUMIDITY (AT 40°C AND
1000Hz):
< 0,5
dB for
30%
<
RH
<
90%
EFFECT
OF
TEMPERATURE:
Microphone:
-0,006
dB/
°C typically
Complete
instrument:
< 0,5 dB
-10
to ,+50°C
Operating
range: -
10
to
+50°C
(+
14 to
122
°
F)
Storage
without
batteries:
-20 to +
70
° C ( -4
to
158°F)
EFFECT
OF
MAGNETIC FIELD:
80
Aim
(1
0rsted)
at
50
Hz
gives:
<
25
dB (A) or <
44
dB (Lin)
VIBRATION SENSITIVITY:
72
dB max. at
40Hz
and 1 ms-
2
.
BATTERIES:
Type: Four 1
,5
V Alkaline cells IEC type
LA
6
(B&K order
No
.
QB
0013)
Life: approx. 8 hours
OVERALL DIMENSIONS AND WEIGHT:
370
X
85
X
47
mm (14,7 X 3,3 X 1,8 in)
860
g
(1
,9
lb) with batteries
ACCESSORIES INCLUDED:
Half-inch Prepolarized Condenser
Microphone
.....
...
....
..
....
...............
....
..
..
Type 4155
2,5
mm mini-jack plug
(x2)
..
....
.
......
....
.
JP
0213
Windscreen
....
.
...
:
...
.
.....
..
...
........
...
...
..
...
...
UA
0237
Input Adaptor
......
..
...................
..
...........
..
JJ 2614
Screwdriver ..
.....
.
...
..
..
..
.
..
..
.........
..
...
.
..
..
..
..
QA
0001
Cells (X4) .
..
..
...
......
..
..................
..
....
.
..
..
...
.
QB
0013
20
dB Attenuator ..
......
...
...
.
....
..
..
..........
...
.
ZF
0020
ACCESSORIES AVAILABLE:
Carrying case
..
.
..
..
.
.....
.
...
...
.
...
..
.......
........
KE
0226
Tripod ............
..
.........
....
..
.
...
..
.
...
.........
..
.....
UA
0801
Sound Level Calibrator ........
..
..
.
....
.
..
Type 4230
Level Recorder Cable ...........
....
..
.....
..
..
.
AO
0173
3 m Microphone Extension cable ..
...
AO
0134
Mains Power Supply and Charger
.....
ZG
0254
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