MRC SC-934 User manual

94/104/114 dB , 125/250/500/1000 Hz
MULTI FUNCTION SOUND
LEVEL CALIBRATOR
Model : SC-934
Your purchase of this Personal MULTI FUNCTION SOUND
LEVEL CALIBRATORwith marks a step forward for you into
the field of precision measurement.Although this calibrator is
a complex and delicate instrument, its durable structure will
allow many years of use if proper operating
techniques are developed. Please read the
following instructions carefully and always
keep this manual within easy reach.
OPERATION MANUAL
Hagavish st. Israel 58817 Tel: [phone], Fax: [phone] ,3
[email protected]
MRC. 2.23

TABLE OF CONTENTS
1.
FEATURES....................................................................................................................
1
2.
SPECIFICATIONS...................................................................................................................
1
3.
FRONT PANEL DESCRIPTIONS.................................................................
2
4.
CALIBRATION.............................................................................................................................
3
5.
BATTERY CHECK............................................................................................................
4
6.
REPLACEMENT of BATTERIES..............................................................................
5

1. FEATURES
IEC 60942 2017 CLASS 2 / ANSI S1.40 2006 CLASS 2
Multi Frequency
Multi level output
Standard 94 dB,104 dB,114 dB / 1KHz
Sound calibrator, useful to calibrate another "
Sound Level Meter " precisely.
2. SPECIFICATIONS
Frequency 1 KHz/ 500Hz/ 250Hz/ 125Hz < 1.7% @ 23± 5
℃
94 dB ,104 dB , 114 dB ( 1 KHz )
Sound Pressure 94 dB ( 1 KHz/ 500Hz/ 250Hz/ 125Hz )
Level Accuracy : < 0.4 dB @ 23± 5
℃
*Spec. tested under the environment
RF Field Strength less than 3 V/M &
frequency less than the 30 MHz only.
Suitable 1 " mic. & 1/2 " mic. , & 1/4 " mic.
Microphone * 0.5" microphone is calibrated with 0.5"
Type mic. Adapte.
Distortion harmonic distortion : < 3 %.
Operating Temp. 0 ℃ to 50 ℃ (32 ℉ to 122 ℉).
Power Supply DC 9 V battery (006P, 6F22) x 1 PCs.
* Recommend use the Alkaline or Heavy
duty type battery.
Power Consump. Approx. DC 16 mA
Power off Auto shut off(approx. 5 minutes) saves battery
life or manual off by push power button > 2 sec..
Battery Check Build in " Low Battery Indicator "
Dimension 124 mm x 62 mm x 42 mm .
Weight Approx. 167 g/0.36 LB (without battery).
Accessories
Instruction manual............................................
1 PC.
Included
1/2" mic. adapter.....................................................
1 PC.
1/4" mic. adapter.....................................................
1 PC.
Carrying case, CA-03.......................................
1 PC.
1

3. FRONT PANEL DESCRIPTION
Fig. 1
3-1 Power button 3-8 104 dB Indicator
3-2 Level select button 3-9 114 dB Indicator
3-3 Frequency select button 3-10 1 KHz Indicator
3-4 1 " Mic Couple Section 3-11 500 Hz Indicator
3-5 1/4" Mic. Adapter 3-12 250 Hz Indicator
3-6 1/2" Mic. Adapter 3-13 125 Hz Indicator
3-7 94 dB Indicator 3-14 Low Battery Indicator
3-15 Battery Cover/Compartment
2

4. CALIBRATION
1) Press the " ON/OFF button " ( 3-1, Fig. 1 ) to
power on the sound level calibrator.
2) If the calibrated " SOUND LEVEL METER " used the 1/2"
microphone, then on the " Couple Section " (3-4, Fig. 1)
should install the " 1/2" Mic. Adapter " (3-6, Fig. 1) first.
Consideration :
If the calibrated " SOUND LEVEL METER " used the 1 inch
microphone, then on the " Couple Section " (3-4, Fig. 1)
should take away the " 1/2" Mic. Adapter ".
3) Press the " Level select button " ( 3-2, Fig. 1 ) to
select the sound level calibrator output level ( 94, 104, 114 dB).
REMARK :
the function can support check sound lever meter Linearity.
4) Press the " Frequency select button " ( 3-3, Fig. 1 ) to
select the sound level calibrator output Frequency.
at 94 dB can select 4 kind frequency 1KHz ,500 Hz ,250 Hz ,125 Hz .
at 104 and 114 dB can select 1 kind frequency 1KHz only
REMARK :
the function can support check sound lever meter
frequency weighting response.
5) Insert the microphone of calibrated " SOUND LEVEL
METER " carefully all the way into the couple section of
the Sound Calibrator. (Refer to Fig. 2).
4) Set the calibrated " SOUND LEVEL METER " to a
range suitable for measuring " 94 dB ", then check the sound
level meter reading value is 94 dB or not .
A pure 1 KHz tone is produced.
3

6) Adjust the calibration VR ( knob ) of the calibrated
" SOUND LEVEL METER " until that the display reach
to 94.0 dB exactly or the meter pointer points
to the " CAL " mark. ( Refer Fig. 2 )
Fig. 2
5. BATTERY INDICATER
When the " Low Battery Indicator " ( 3-14, Fig. 1 ) is light,
Express the battery voltage are under low voltage condition,
please should replace the batteries. How to replace battery,
please refrence section 6.
4

6. REPLACEMENT of BATTERY
1) Take away the " Battery Cover " (3-15, Fig. 1).
Please refer to Fig. 1.
2) Remove the old batteries & replace the new 9V
batteries.
3) Make sure the battery is installed to the right position &
connected to the proper polarization with the battery
snap.
4) Reinstate the battery cover after changing the batteries.
5