B+K precision CAL73 User manual
CONTENTS
Title Page
1. Safety Information………………………….. 1
EnvironmentConditions………………………………….1
Maintenance&Clearing………………………………….1
Safety symbols……………………………………………1
2. Description……………….….……………… 2
3. Features……………………..…..…………….2
4. Specifications………..……..………………..2
Output sound pressure levels…………………………...2
Output frequency………………………………………….2
Referenceconditions……………………………………..2
Influence of ambient conditions…………………………2
Total Harmonic Distortion (THD)…………………………
2
Accuracy of sound pressure level………………………2
Power………………………………………………………2
Battery life………………………………………………….2
Battery test ………………………………………………..3
Dimensions………………………………………………..3
Weight……………………………………………………...3
Ambientconditions……………………………………….3
Storage temperature & humidity………………………...3
Accessories………………………………………………..3
5. Nomenclature And Function.……………...4
6. Operating Preparation…….….…………….5
7. Calibration Procedure….…….……………..5
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Sound Level Calibration
1
1. Safety Information
Read the following safety information carefully
before attempting to operate or service the meter.
Use the meter only as specified in this manual;
otherwise, the protection provided by the meter
may be impaired.
Environment Conditions
§Altitude up to 2000 meters
§Relative humidity 90% max.
§OperationAmbient 0° to 40°C
Maintenance & Clearing
Repairs or servicing not covered in this manual
should only be performed by qualified personnel.
Periodically wipe the case with a dry cloth. Do not
use abrasives or solvents on this instrument.
Safety symbols
Complywith EMC
When servicing, use only specified replacement
parts.
2. Description
Sound level calibrator is used to calibrate sound
level meters and other sound measurement
equipment. You can calibrate 1 inch diameter
microphones directly and 1/2 inch microphones
using 1/2 inch adaptor supplied with the calibrator.
With available adaptors, you can calibrate other
microphones and instruments.
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Sound Level Calibration
2
3. Features
Conforms to ANSI S1.4-1984 and IEC
60942-2003 Class 2.
Calibration levels of 94dB and 114dB.
Fits 1 inch and 1/2 inch diameter microphone.
4. Specifications
Output sound pressure levels:
94dB and 114dB re 20 uPa under reference
conditions.
Output frequency: 1000Hz +/-2%
Reference conditions:
Temperature :23°C (74°F)
Relative humidity: 50%
Atmospheric pressure: 1013hpa
Influence of ambient conditions:
Temperature coefficient: 0.005dB/?
Humidity coefficient: 0.005dB/%RH
Total Harmonic Distortion (THD): <3%
Accuracy of sound pressure level: +/-0.5dB
Power: one 9V battery 006P or IEC 6F22 or
NEDA 1604.
Battery life: approx.40 hours (Alkaline Battery)
Battery test:
Internal circuitry checks condition of battery
continuously.
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Sound Level Calibration
3
Calibrator will not operate when the green LED
turns to red, which means that battery voltage
has fallen bellow the acceptable range.
Dimensions (LxWxH):
4.4 x 2.4 x 1.7inch(113 x 63 x 44mm)
Weight: approx. 170g(including battery)
Ambient conditions:
0° –40°C (32° –140°F), 10 –90%RH,
650 –1080hpa
Storage temperature & humidity:
-10° –50°C (14° –122°F), 0 –70%RH
Accessories:
Instruction manual, carrying case, 9V battery,
1/2”microphone adapter
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Sound Level Calibration
4
5. NomenclatureAnd Functions
•Power and low battery indicate LED.
‚Power and output level select switch.
ƒTransducer assembly 1-inch cavity for
microphone insertion.
„1/2-inch microphone adapter.
…Battery cover.
94dB
114dB
ANSI S1.40 - 1984
IEC 60942 Class 2
OFF
NEDA 1604
9V BAT TERY
6F22 , 006P
1
2
3
4
5
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Sound Level Calibration
5
6. Operating Preparation
(1) Remove battery cover and install a 9V Battery in
the battery compartment.
(2) To quickly check the operation of the sound level
calibrator.
Proceed as follows:
(a) Turn the power switch from OFF to the 94dB
position. The user can start to operate it when
LED indicates a green light. If there is no light,
please replace the battery.
(b)Change the switch from 94dB to 114dB, the dB
level will increase by 20. You can calibrate in noisy
environments and check linearity.
7. Calibration Procedure
(1) The cavity of the calibrator will accommodate 1-inch
microphone.
(2) When the calibration is performed to an
instrument with 1/2-inch microphone, the 1/2-inch
microphone adaptor will have to be inserted by
gently pushing it into the cavity till the end.
(3) Place the sound level calibrator over the
microphone of the sound measuring instrument
ANSI S1.40 - 1984
IEC60942Class2
114dB
94dB
OFF
Lo = 30 80 dB
Med=
Hi =
POWER-UP OPTIONS
Auto=
100 dB
130 dB
130 dB
50
80
30
MAX
CLOCK
REC
MIN
LEVEL
SLOW
INTV
FAST
SETUP
C
A
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Sound Level Calibration
6
being calibrated.
(4) On the instrument under test, set the level range
control to the range having 100dB as its upper
limit if 94dB was selected on the sound level
calibrator. If 114dB was selected on the sound
level calibrator, choose a range with on upper
limit of 120dB. The instrument may be set to
FAST or SLOW response and C or A weighting.
(5) Read the level on the instrument under test and
adjust the sensitivity control for the correct
indication of the sound level calibrator level
selected in step.
(6) When the calibrator is not being used, please
switch OFF the power to save the battery.
CAUTION!
Ambient sources of noise or vibration can
cause a false calibration indication; this can be
especially signification at the lower 84dB level.
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