Display

 18mm LCD, 3 ½ digits.

Function

 DB (A & C frequency weighting), Time weighting (Fast,Slow), Max.hold

 AC & DC output.

Measuring Range

 3 ranges,35 to 130dB(typical 30 to 130dB),input signal only.

Resolution

 0.1dB.

Accuracy (23 ± 5°C)

 Frequency weighting meet IEC651 Type2, calibrating input signal on

 94dB (31.5Hz to 8kHz),the accuracy of A weighting is specified as f

 following:-

 31.5Hz - ±3dB, 63Hz - ±2dB, 125Hz - ±5dB

 250Hz - ±105dB, 500Hz - ±1.5dB, 1kHz - ±1.5dB

 2kHz - ±2dB, 4kHz - ±3dB, 8kHz - ±5dB

Frequency Weighting

Network

 A weighting: The characteristic is simulated as “Human Ear Listings”

 response. Typical,if making the environmental sound level measurement,

 always select to A weighting.

 C weighting: The characteristic is near the “FLAT” response.Typical,it is

 suitable for checking the noise of machinery (Q.C. check) & knowing the 

 sound pressure level of the tested equipment.

Frequency

 31.5Hz to 8,000Hz.

Calibrator

 B & K (Bruel & Kjaer), multi-function acoustic calibrator,model:4226.

Microphone / Size

 Electric condenser microphone / ½ inch standard size.

Range Selector

 30 to 80dB, 50 to 100dB, 80 to 130dB (50dB on each step), with over &

 under range indicating.

Time Weighting

Fast & Slow

 (F & S)

 Fast: t = 200mS, Slow: t = 500mS,

 *”Fast” range simulated the human rsponse time weighting.

  ”Slow” range is easy to get the average values of vibration sound level.   

 *The Fast & Slow” time weighting range are designed to IEC651 type 2

  requirement.

Output Signal

 AC output: AC 0.5Vrms corresponding to each range step.

 DC output: DC 0.3 to 1.3V, 10mV per dB.

 Output impedance: 600 W

Calibration

 Build in external calibration VR, easy to calibrate on 94dB level by screw

Output Terminal

 305mm Æ phone output terminal is provided for connection with analyzer,

 level recorder, tape recorder.

Operating Temp.

 0°C to 50°C (32°F to 122°F).

Operating Humidity

 Max.90% RH (0° to 35°C).

Power Source

 DC 9V battery (Heavy Duty type).

Dimension

 SL-4001: 245 X 80 X 35mm / SL-4011: 255 x 80 x 30mm

Accessories

Carrying Case, Instruction Manual.