Hangzhou Lutron sound level where wholesale?

Hangzhou Lutron sound level where wholesale? Hangzhou Lutron sound level meter can wholesale Chak Instrument Co., Ltd. Zhuhai. Hangzhou SL-4022 precision sound level meter in line with international standards: IEC61672 Class 1, IEC651-type-1 Fast and slow dynamic characteristic pattern, condenser microphone ensures high accuracy and long-term stability characteristics: 1. The main function (frequency weighting and Time-weighted) and performance in line with IEC 651,1 type 2. LCD display, font size, and low power and clear 3. Standard A and C frequency weighting 4.30 to 130 decibels, third gear 5. fast and slow dynamic range 6. characteristic pattern condenser microphone ensures high accuracy and long-term stability 7. calibration with built-in variable resistor 8. A / DC output 9. Maximum hold feature to show up 10. The maximum overload alarm, low voltage indication 11 . The member durable ABS plastic shell 12. The small size, light weight, you can one-hand operation performance: LCD display three and a half show, character height 18mm resolution 0.1 dB range 3-speed (30 ~ 70 dB, 60 ~ 100 dB, 90 ~ 130 dB) function dB (A and C frequency weighting), Time weighting (fast and slow), maximum hold, AC & DC output accuracy: (23 ± 5 ℃) time-weighted frequency weighting in line with IEC651 standards, calibration signal value is 94 dB (31.5Hz ~ 8KHz), A-weighted accuracy as follows: 31.5Hz ~ ± 1.5 dB, 63Hz ~ ± 1.5 dB, 125Hz ~ ± 1 dB, 250Hz ~ ± 1 dB, 500Hz ~ ± 1 dB, 1KHz ~ ± 1 dB, 2KHz ~ ± 1 dB, 4KHz ~ ± 1 dB, 8KHz ~ ± 1.5 dB ~ ± 3dB frequency weighting network A and C characteristic A-weighted: This feature is an imitation of "human hearing"; in response. When the ambient noise measurements, choose A-weighted C-weighted: This feature is close to the "FLAT"; in response, in particular to check the machine noise (QCcheck) and a known sound pressure level of equipment calibration B and K (Bruel and Kjaer), multifunction sound calibration, model 4226 frequency 31.5 Hz ~ 8000Hz miniature condenser microphone microphone microphone Size 1 / 2in standard size range selection 30 ~ 80 dB, 50 ~ 100 dB, 80 ~ 130 dB, with a range of over-range indication, 50 db / each file time-weighted (fast and slow) fast t = 200ms, Slow t = 500ms * "fast"; range is weighted to mimic human hearing response time; "slow"; range is a measure of the average sound level fluctuation * Fast, Slow weight range is designed according to IEC651 standard output signal AC output AC 0.75Vrms / Range DC output of each file DC0.3 ~ 1.3V, 10mV / dB, output impedance of 600 W output terminal ￠ 3.5mm phone output terminal connected to the analyzer, recorder, tape recorder maximum operating temperature of 0 ℃ ~ 50 ℃ Operating humidity 80% RH (0 ℃ ~ 35 ℃) Power DC9V battery power consumption of about DC 17mA Size 260 × 87 × 36mm Weight 450g Standard accessories Manual 1 Optional parts 94 dB sound level meter calibration, SC-941, SC-940A