Velleman DVM1356 Manuale utente

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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