Velleman DVM1356 User manual
DVM1356 SOUND LEVEL CALIBRATOR 1
SOUND LEVEL
CALIBRATOR
DVM1356
INSTRUCTION MANUAL
HANDLEIDING
MANUEL D’UTILISATEUR
DVM1356 SOUND LEVEL CALIBRATOR 2
SAFETY INFORMATION
lRead the following safety information carefully before attempting
to operate or service the calibrator.
lUse the meter only as specified in this manual ; otherwise the
protection provided by the meter may be impaired.
lThe Sound-level calibrator is useful to calibrate a sound-
measuring instrument.
lEnvironment conditions
Altitude up to 2000 meters
ôRelatively humidity 90% max.
íOperation ambient temperature : 0 ∼40°C
lMaintenance & cleaning
Repairs or servicing not covered in this manual should only be
performed by qualified personnel.
ôPeriodically wipe the case with a dry cloth. Do not use
abrasives or solvents on this instruments.
lSafety symbols
Complies with EMC
FEATURES
lConforms to ANSI S1.40-1984 and IEC942 1988 Class 2.
lCalibration levels of 94dB and 114dB.
lFits 1", 1/2" and 1/4" diameter microphone.
DVM1356 SOUND LEVEL CALIBRATOR 3
SPECIFICATIONS
lOutput sound-pressure levels :
114dB and 94dB re 220µPa under reference conditions.
lOutput frequency : 1000Hz ±4%
lReference conditions :
Temperature : 20°C (68°F)
ôRelative humidity : 65%
íAtmospheric pressure : 1013hPa
lTemperature coefficient : ±0.015dB/°C
lTotal harmonic distortion : <3%
lAccuracy of sound-pressure levels :
Under stated reference environment conditions : ±0.5dB
lPower : 1 x 9V battery
lBattery life : approx. 100 hours (with alkaline battery)
lBattery test :
Internal circuitry checks condition of battery continuously.
Calibrator will not operate at all if battery voltage falls below
acceptable range.
lDimensions : 103(L) x 63(W) x 54(H)mm
lWeight : approx. 200g (including battery)
lOperating temperature & humidity :
0 ∼40°C (32 to 104°F), 10 ∼90% RH
lStorage temperature & humidity :
-10 ∼60°C (14 to 140°F), 10 ∼70% RH
lAccessories :
Instruction manual, carrying case, 9V battery, 1/2" and 1/4",
microphone adapter.
DVM1356 SOUND LEVEL CALIBRATOR 4
NOMENCLATURE AND FUNCTIONS
Power and output level selection switch.
ôTransducer assembly 1-inch cavity for microphone insertion.
íBattery cover.
÷1/2-inch microphone adapter
û1/4-inch microphone adapter
DVM1356 SOUND LEVEL CALIBRATOR 5
PREPARING FOR OPERATION
(1) Remove battery cover and install a 9-Volt battery in the battery
compartment.
(2) To quickly check the operation of the Sound level Calibrator
before using it, proceed as follows :
(a) Turn the power switch from OFF to the 94dB position and
listen for a 1000Hz audible tone. This indicates that the
instrument is working. If no tone is evident, the battery may
need replacing.
(b) Change the switch from 94dB to 114dB, the 20dB increase in
level of the 1000Hz tone should be easy to hear.
CALIBRATION OF SOUND-MEASURING
INSTRUMENTS
(1) The cavity of the calibrator will accommodate a 1-inch
microphone.
(2) When the calibration is performed on an instrument with a 1/2-
inch microphone, the 1/2-inch microphone adapter will have to be
inserted by gently pushing it completely into the cavity.
(3) When calibration is performed on the instrument with a 1/4-inch
microphone, remove the 1/2-inch microphone adapter. The 1/4-
inch microphone adapter has to be inserted for the transducer
assembly of calibrator.
(4) Insert the proper adapter, if one is required, in the cavity of the
Sound-level calibrator to fit the particular microphone under
calibration.
(5) Set the Sound-level calibrator power switch to the 94dB or 114dB
position, depending on the desired level of calibration. (Select the
level closest to the upper limit of the level range intended for
measurement.)
DVM1356 SOUND LEVEL CALIBRATOR 6
(6) Place the Sound-level calibrator over the microphone of the
sound-measuring instrument being calibrated.
(7) Set the LEVEL RANGE control on the instrument being tested to
the range with 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 an upper limit of 120dB. The
instrument may be set to FAST or SLOW response and C or A
weighting.
(8) Read the level on the instrument being tested and adjust the
sensitivity control for the correct indication of the Sound-level
calibrator level selected in step.
(9) When the calibrator is not in use, please switch it OFF to save the
battery.
CAUTION
Ambient sources of noise or vibration can cause a false calibration
indication, this can be especially significant at the lower 84dBA
level.
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