©York Survey Supply Centre 2018
Ref:.. \operat98\instructions 18\34302.qxp 05-01-18
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
1. Altitude up to 2000 metres
2. Relative Humidity 90% max.
3. Operation Ambient 0 - 40
O
C
Maintenance and Clearing
1. Repairs or servicing not covered in this manual should only be performed by qualified personnel.
2. Periodically wipe the case with a dry cloth. Do not use abrasives or solvents on this instrument.
Safety Symbols
Meter is protected throughout by double insulation or reinforced insulation.
When servicing, use only specified replacement parts.
Comply with EMC
2. General Description and Features
Thank you for selecting our Sound Level Meter. To ensure that you can get the most from it, we recommend that
you read and follow the manual carefully before use.
The unit is designed according to IEC651, ANSI S1.4 for sound level meters.
The Sound Level Meter has been designed to meet the measurement requirements for industrial safety offices
and sound quality control in various environments.
• Ranges from 35dB to 130dB at frequencies between 31.5Hz and 8KHz.
• Display with 0.1dB steps on a 4-digit LCD.
• With two weighting, A and C.
• Both AC and DC signals output is available from a single standard 3.5mm coaxial socket suitable for a
frequency analyzer, level recorder, FFT analyzer, graphic recorder, etc...
3. Specifications
Standard Applied According to IEC651, ANSI S1.4
Frequency Range 31.5Hz - 8KHz
Measuring Level Range 35 - 130 dB
Frequency Weighting A/C
Microphone 1/2 inch Electret condenser microphone
Display LCD
Digital Display 4 Digits
Resolution: 0.1dB
Display Period: 0.5sec
Time Weighting FAST (125mS), SLOW (1 sec).
Level Ranges Lo: 35 - 100dB and Hi: 65 - 130dB
Accuracy ±2.0dB (under reference conditions)
Dynamic Range 65dB
Alarm Function “OVER” is shown when input is out of range.
Maximum Hold Hold readings, with decay <1dB/3 minutes.
Calibration Electrical calibration with the internal oscillator (1KHz sine wave)
AC Output 0.65 Vrms at FS (full scale), output impedance approx. 600
W
DC Output 10mV/dB, output impedance approx. 100
W
Power Supply One 9V battery 006P or IEC 6F22 or NEDA 1604
Power Life About 50 hrs (alkaline cell)
Operating Temperature 0 - 40
O
C (32 - 104
O
F)
Operating Humidity 10 - 90% RH
Storage Temperature -10 - 60
O
C (14 - 140
O
F)
Storage Humidity 10 - 75% RH
Dimensions 240(L) x 68(W) x 25(H)mm
Weight 210g (including battery)
Accessories 9V battery, carrying case, screwdriver, instruction manual, 3.5
j
plug.
4. Nomenclature and Functions
1. Microphone
1/2 inch Electric Condenser microphone
2. Display
Serves to display the sound pressure level (dB), over or under range
“OVER”, maximum hold data “MAX HOLD” and low battery indicator
“BT”.
dB: Sound pressure level with 0.1dB resolution.
OVER: Shown when the range setting is too high or low.
3. Power and Range Switch
• Turn power ON and select measurement range.
(Hi range = 65 - 130dB, Lo range = 35 - 100dB)
• When “OVER” is indicated, slide range switch to another range for
measurement.
4. Response and Max Hold Switch
Setting the meter dynamic characteristics (fast/slow) and maximum
value hold
S (Slow response): for comparatively stable noise measurement.
F (Fast response) : for fast varying noise.
MAX HOLD: The max hold position is used to measure the maximum level of sounds. The maximum measured
level is updated continuously.
To refresh please set the switch to “F” or “S” position to cancel existing value, then, set switch to “MAX HOLD”
position.
5. Function Switch (A/C weighting & calibration selector)
A: A-weighting
C: C-weighting
CAL 94dB: Calibration
6. Calibration Control
can be adjusted clockwise or counterclockwise to standard 94.0dB.
7. Reset Button
Serves to reset the maximum level indication.
8. Output Jack
Standard 3.5mm 3 pole coaxial output socket.
Serves to supply AC signals and log-converted DC signals to external equipment.
Outputs:
Two outputs can be accessed through 3.5mm stereo plug refer.
DC output: Logarithmic signal. 10 mV/dB. Impedance <100
W
AC output: approx. 0.65 Vrms corresponding to each range step. Impedance = 600
W
9. Battery Cover (on bottom)
LCD Display Description
1. Sound Pressure Level measuring value, resolution 0.1dB.
2. Measuring unit.
3. When readout is out of range.
4. MAX HOLD: Maximum Hold.
5. BT: Low battery
indicator.
5. Calibration Procedures
1. Using an acoustic calibrator
a) Make the following switch settings.
RANGE: Hi
RESPONSE: F
FUNCT: A
b) Insert the microphone carefully into the insertion hole of
the calibrator.
c) Turn on the switch of the calibrator and adjust the CAL
screw of the instrument, until the level display indicates the
desired level.
Note: Our products are calibrated before shipment.
Recommended calibrator cycle is six months.
