Brüel & Kjær 2230 Assembly instructions

Brilel & Kjcer
037-0539
Precision Integrating
Sound Level Meter
Type 2230
Valid from serial no. 1028 340

. .,
J,
Briiel & Kjcer
037-0539
Precision Integrating
Sound Level Meter
Type 2230
Valid from serial no. 1028340

BRUEL & KJ.LER
Nrerum-Denmark Service Instruction 2230
Precision Integrating
Sound Level Meter
Type 2230
Valid from serial no. 1 028 340
037-0539
Consisting of:
Service Instruction
Checking Procedure
Analog Circuit
Digital Circuit
ZC 0020 Preamplifier
ZF 0020 Attenuator
ZZ 0187 Main Board
Mechanical Parts
Circuit Diagram
Updating
page
0-1
0-3
0-4
1-1
1-2
2-1
2-3
3-1
2
1
3
4
4-1
5-1
date
4.83
4.83
4.83
4.83
4.83
4.83
4.83
4.83
10.82
10.82
10.82
10.82
10.82
10.82
4.83
4.83
Due to the constant progress in technology the instrument will
from time to time be brought up to date in order to provide
continuously improved performance.
For this reason there may be small variations between the instru-
ment and the Service Instruction.
However, the local Service Representative is in possession of all
informations regarding any change that has been made.
4.83
Trouble Shooting
If any fault should occur, check the instrument according to the
Checking Procedure.
The Checking Procedure is divided up into sections, where each
section will refer to a subsection in the Service Instruction corre-
sponding to a specific part of the instrument.
The subsection in the Service Instruction will normally consist of
a Block Diagram, a Technical Description, an Adjustment Proce-
dure and a Simplified Diagram where the test points are identi-
fied.
Before correcting any apparent deviation make sure that the
measuring instrument has tolerances small enough not to affect
the measurement.
When a fault has been traced and corrected, the voltages and
adjustments influenced by the correction must be rechecked.
The complete instrument should then be tested to make sure that
all basic functions are operative.
The tolerances given in these notes are intended for use as guide
for adjustments.
Many instruments have various aids to be used when trouble
shooting or adjustment is carried out. They are not necessarily
mentioned in the Service Instruction.
The local Service Representative is in possession of information
regarding these aids.
Spare Parts
Please state type and serial number of the instrument when
ordering spare parts.
0-1

BRUEL & KJJER
Nrerum-Denmark
4.83
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Valid from serial no . 1028 340
Service Instruction 2230
0-3

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Ext. Filters AC Output
DC Output 1 I
Weighting RMS I I
Input Amp. Filters Output Amp. Circuit DC Amp .
Calcula-
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110
100
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Digital Circuit 2230.31
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BRUEL & KJ.LER
Nrerum-Denmark
Sensitivity
POWER: "On "
REF., TEST, OPERATE: "Operate"
FSD: "100"
FREQ. WEIGHTING: "Lin 1\ "
EXT. FILTEA: "Out"
SOUND INCIDENCE: "Frontal "
DISPLAY:
"SPL"
TIME WEIGHTING: "Fast"
DETECTOR: "RMS"
ALL-MAX/MIN-PAUSE: "All"
Linearity
FSD to "120"
Frequency Response
FSD to "100"
Weighting Filters
FREQ. WEIGHTING to "A " or "C"
4.83
Checking Procedure 2230.1
Input
Voltage
DC Output
Voltage
Input signal through a 15 pF capacitor ' (Adaptor Type WA 0302) to Preamplifier
ZC 0020 input: 50 mV , 1kHz.
Check the Display reading: 94, 0.
If necessary adjust "Sens. Adj." on the right side of the instrument.
If not consult 2230.2 Analog Circuit.
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OdB
-10dB -20dB -30dB
- 40dB -SO dB
3,000V
2,500V 2, 000V 1,500v 1,000 v O,SOOV
Input signal 1kHz corresponding to 3,000 V at "DC Output".
Decrease the Input voltage in 10dB step and check that the DC Output de-
creases by 500 mV.
Tolerance: ±
30 mV.
Display reading
Freq.
Hz
unn
Lin
10 87,9 ± 2,0 93,4 ± 0,5
20 93,1 ± 0,5 93,7 ± 0,3
40 93,9 ± 0,3 93,9 ± 0,3
80 94,0 ± 0,3 94,0 ± 0,3
1,0k 94,0 94,0
2,5 k 94,0 ± 0,3 94,0 ± 0,3
S,Ok 94,0 ± 0,3 94,0 ± 0,3
10 k 94,0 ± 0,3 94,0 ± 0,3
20k
93,9 ± 0,3 93,5 ± 0,5
Input signal 1kHz corresponding to 94,0 on the Display.
Check the frequency response according to the table above.
Display reading
Freq.
Tolerance
Hz A c +
dB -
10 79,7 1,5 2,0
20
435
87,8 1,0 1,0
40 59,4 92,0 0,5 0,5
80 71,5 93,5 0,5 0,5
160 80,6 93,9 0,3 0,3
315 87,4 94,0 0,3 0,3
1,0k 94,0 94,0 0 0
2,5 k 95,3 93,7 0,3 0,3
S,Ok 94,5 92,7 0,5 0,7
10k 91,5 89,6 1,0 1,5
20k
84,7 82,8 1,0 1,5
Input signal 1kHz corresponding to 94,0 on the Display .
Check the frequency response according to the table above .
If not consult 2230.2 Analog Circuit.
Valid from serial no. 1028 340
1-1

2230.1 Checking Procedure
Random Freq. Response
SOUND INCIDENCE to "Random"
FREQ. WEIGHTING to "Lin 1\ "
Leq. SEL
SOUND INCIDENCE to "Frontal"
FSDto"110"
DISPLAY to "Leq"
DISPLAY
to "SEL"
TIME WEIGHTING to "Imp or Slow"
Overload
DISPLAY to "SPL"
TIME WEIGHTING to "Fast"
Test
REF., TEST, OPERATE to "Test"
REF.
REF. TEST, OPERATE to "Ref."
Calibration
REF. TEST. OPERATE to "Operate"
1-2
Freq. Display
kHz
reading
1,0 94,0
2,5 94,3 ± 0,3
5,0 95,2 ± 0,5
10 96,8 ± 0,5
20 98,2 ± 0,5
Input signal 1kHz
corresponding to 94,0 on the Display.
Check the frequency response according to the table above.
Input signal 1kHz corresponding to 94,0 on the Display.
Activate "Reset"
Check the Display reading: 94,0 ± 0, 1.
Activate " Reset" and let the Leq run for exactly 10 s.
Check that the Display reads: 103,9 and is increasing every second the next 10
seconds.
Check that an arrow occurs to the right of the Display.
Notice: This arrow can be removed by removing the jumper "1" near the "Peak
- RMS" switch.
If the above cannot by fulfilled consult item 2230.3 Digital Circuit.
Input signal: 1,05 V, 1kHz.
Check that the Overload indication on the Display does not light.
Increase the Input
voltage to: 1,12V.
Check that the Overload lights : ± 0,05 V
If not consult 2230.2 Analog Circuit.
Check that all digits and Signs on the Display lights.
Check the Display reading: 94,0 ± 0, 1.
Mount the Preamplifier ZC 0020 and .;, the Microphone Type 4155.
Check by means of a Sound Level Calibrator or a Pistonphone that the calibra-
tion is correct.
If necessary adjust "Sens. Adj. ".
4.83

BROEL & KJIER
Nrerum- Denmark
Detector Balance
POWER: "On"
REF., TEST, OPERATE: "Operate"
FSD: "110 dB "
FREQ. WEIGHTING: "Lin 1\ "
EXT. FILTER: "In"
SOUND INCIDENCE: "Frontal"
DISPLAY: "SPL"
TIME WEIGHTING: "Fast"
DETECTOR: "RMS"
ALL-MAX/MIN-PAUSE : "All"
Pr eamp Offset
FSD to " 70 dB "
EXT. FILTER to " Out "
FSDto "110"
Weighting Network
FREQ. WEIGHTING to " C"
FREQ. WEIGHTING to "A"
Overload
EXT. FILTER to "In"
FREQ. WEIGHTING to "Lin 1\ "
Reference Generator
4.83
REF., TEST, OPERATE to " Ref."
EXT. FILTER to "Out "
Analog Circuit
2230.2
ADJUSTMENT PROCEDURE
Input signal to "Ext. Filter" socket J201 pin 1: 633 mV , 1kHz .
Check at ZE 0410 pin 15 that the curves are equal.
If necessary adjust P205.
Change the input voltage to 2mV.
Set P206 to middle position.
Check the Display reading: "60,0".
If necessary adjust P207.
Check the "DC Output" voltage: 500 ± 2 mV.
If necessary adjust P209.
Change the input voltage to : 633 mV .
Check the "DC Output " voltage : 3000 ± 2 mV.
If necessary adjust P208.
Check the Display reading: "11 0" .
If necessary adjust P1 03. (Ref. to Digital Circuit 2230. 3) .
Repeat the above adjustments until all are within the tolerances.
Short circuit the Preamplifier ZC 0020 input to ground through a 15pF capacitor
(Adaptor Type WA 0302).
Check the voltage at the output of the Preamplifier on the point C205, 206:
0 ±
20mV DC.
If necessary adjust P201.
Input signal through the adaptor to the ZC 0020 input: 50 mV , 1kHz.
Check the Display r.eading: "94,0".
If
necessary adjust P206.
Check the Display reading: "94,0".
If necessary adjust P202.
Check the Display reading: "94 , 0".
If necessary adjust P203.
Input signal to "Ext. Filter" socket J201 pin 1: 2,2 V, 1kHz.
Check that the Overload arrow lights within ± 0,2 dB.
If necessary adjust P204.
Check the frequency at the Ref. input to ZE 0399 pin 3: 1000 ± 1 Hz.
If necessary adjust P1 01 .
Check the Display reading: "94,0".
If
necessary adjust P1 02.
Valid from serial no. 1028 340 2-1