Description
Accuracy :Frequency weighting meet IEC 651 type 2, calibrating input signal on 94 dB(31.5 Hz to 8 kHz), then the accuracy of A weighting is specified as following:
31.5 Hz – ± 3 dB, 63 Hz – ± 2 dB, 125 Hz – ± 1.5 dB
250 Hz – ± 1.5 dB, 500 Hz – ± 1.5 dB, 1 kHz – ± 1.5 dB
2 kHz – ± 2 dB, 4 kHz – ± 3 dB, 8 kHz – ± 5 dB
Frequency Weighting Network :A weighting – The characteristic is simulated as “Human Ear Listing” 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 :31.5 Hz to 8,000 Hz.
Calibrator :B & K (Bruel & kjaer), multi-fuction acoustic calibrator, model : 4226.
Microphone :Electric condenser microphone.
Size of microphone :1/2 inch standard size.
Range selector :30 to 80 dB, 50 to 100 dB, 80 to 130 dB, 50 dB on each step, with over & under range indicating.
Time weighting (Fast & Slow):Fast – t= 200 ms, Slow – t = 500 ms,
* “Fast” range is simulated the human ear response time weighting.
“Slow” range is easy to get the average values of vibration sound level.
Calibration :* Build in external calibration VR, easy to calibrate by external screw driver.
* Internal oscillation system, 1 KHz sine wave generator.
Output Signal :AC output – AC 0.5 Vrms corresponding to each range step.
DC output – DC 0.3 to 1.3 VDC, 10 mV per dB.
Out put impedance – 600 ohm.
Out terminal :3.5 phone output terminal is provided for connection with analyzer, level recorder, tape recorder.
Operating Temp. :0 to 50 ( 32 to 122 ). ℃ ℃℉ ℉
Operating Humidity :Less than 80% RH
Dimension :205 x 80 x 35 mm ( 8.1 x 3.2 x 1.4 inch).
Weight :280 g/0.62 LB (including battery).
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