©York Survey Supply Centre 2018
Ref:.. \operat98\instructions 18\343010.qxp 05-01-18
Digital Sound Level Meter
I. 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 meters
2. Relatively humidity 90% max.
3. Operation Ambient 0-40°C
• Maintenance & Cleaning
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
II. General Description
Thank You for using the Digital Sound Level Meter. To ensure that you get the most from it, we recommend that you read and follow the manual carefully before use.
This unit conforms to the IEC651 type 2, ANSI S1.4 type 2 for Sound Level Meters.
This sound level meter has been designed to meet the measurement requirements of safety Engineers, Health, Industrial safety officers and sound quality control in
various environments.
• Ranges from 35dB to 130dB at frequencies between 31.5Hz and 8KHz.
• Displays with 0.1dB steps on a 4-digit LCD.
• With two equivalent weighted sound pressure levels. A and C
• Both AC and DC signal output is available from both standard 3.5mm coaxial socket suitable for frequency analyser, level recorder, FFT analyser, graphic recorder;
etc.
III. Specifications
Standard applied:
IEC651 type 2, ANSI S1.4 type 2
Frequency range:
31.5Hz~8KHz
Measuring level range:
35~130dB
Frequency weighting:
A/C
Microphone:
½ inch electret condensor microphone
Calibration:
Electrical calibration with the internal oscillator (1Khz sine wave)
Display:
LCD
Digital display:
4 digits
Resolution: 0.1dB
Display Up data: 0.5 sec
Time weighting:
FAST (125mS), SLOW (1 sec)
Level ranges:
Lo: 35~100dB
Hi: 65~130dB
Accuracy:
± 1.5dB (under reference conditions)
Dynamic range:
65dB
Alarm function:
“OVER” is shown when output is out of range
Maximum hold:
Hold readings the Maximum Value with decay <1dB/3 minutes
AC output:
0.65 Vrms at FS (Full Scale). Output impedance: Approx 600
W
(FS: means the upper limit of each level range)
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 hours (alkaline battery)
Operation temperature:
0 to 40ºC (32 to 104ºF)
Operation humidity:
10 to 90%RH
Storage temperature:
-10 to 60ºC (14 to 140ºF)
Storage humidity:
10 to 75%RH
Dimensions:
245(L) x 64(W) x 31(H)mm
255g (including battery)
Weight:
9V battery, carrying case, instruction manual
(1) Windscreen
If you operate at wind speed over 10m/sec, please put protective
accessories in front of the microphone.
(5) Power and function switch
Turn power ON/OFF and select A/C weighting & calibration function.
A: A - Weighting. For general sound level measurement
C: C - Weighting. For checking the low-frequency content of noise.
(If the C-Weighted level is much higher than the A-Weighted level, then there is a large amount of low-frequency noise)
CAL 94dB: Calibration using the internal oscillator
(6) MAX Hold Button
The max. hold position is used to measure the maximum levels of sounds. The maximum measured level is updated continuously. Press once again the button, will
release the hold and allow a further measurement. (Maximum Hold: Decay < 15 digits/3 min)
(7) Data Hold Button
The hold function freezes the reading in the display. Press the HOLD button momentarily to activate or to exit the HOLD function.
(8) Microphone
½ inch electret condensor microphone
(9) DC, AC Output Jack
Standard 3.5mm 3 pole coaxial output socket servers to supply AC signals and log-converted dc signals to external equipment.
OUTPUTS: Two outputs can be accessed through 3.5mm stereo phone plug refer.
DC output: Logarithmic signal. 10mV/dB. Impedance
£
100
W
AC output: approx. 0.65Vrms corresponding to each range step. Impedance ≈100
W
(10) Calibration Potentiometer
The calibration potentiometer can be adjusted clockwise or counterclockwise to standard 94.0dB
(11) Tripod mounting screw
(12) Battery cover
