18mm LCD，3 1/2 digits

測(cè)量功能

dB（A&C frequency weighting）, Time weighting（Fast, Slow）, Max hold, Max hold reset, AC output

測(cè)試範(fàn)圍

3 ranges （ 30 - 70 dB、60 - 100 dB、90 - 130 dB ）

解 析 度

0.1 dB

精 確 度

Time weighting & frequency weighting meet IEC 651 type 1, calibrating input signal on 94 dB
（31.5 Hz to 8 kHz）, the accuracy of A weighting is specified as following:
31.5 Hz - ± 1.5 dB, 63 Hz -± 1.5 dB, 125 Hz - ± 1 dB、250 Hz - ± 1 dB, 500 Hz - ± 1 dB,
1 kHz -± 1 dB、2 kHz - ± 1 dB, 4 kHz - ± 1 dB, 8 kHz - + 1.5 dB to -3 dB

頻率加權(quán)網(wǎng)路

Characteristics of A & C.

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

測(cè)試頻率範(fàn)圍

31.5 Hz to 8,000 Hz

校 正 器

B & K （Bruel & kjaer）, multi-fuction acoustic calibrator, model : 4226

麥克風(fēng)種類

Electric condenser microphone.

麥克風(fēng)尺寸

1/2 inch standard size.

範(fàn)圍選擇

30 to 70 dB、60 to 100 dB、90 to 130 dB，40 dB on each step,with over & under range indicating

時(shí)間加權(quán)網(wǎng)路
（快 / 慢）

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.
* The "Fast" & "Slow" time weighting range are designed to IEC 651 type 2 requirement

校正方式

Build in external calibration VR, easy to calibrate on 94 dB level by screw driver.
Internal oscillation system, 1 KHz sine wave generator

輸出信號(hào)

AC output - AC 0.4 Vrms corresponding to each range step.

輸出端子

3.5 phone output terminal is provided for connection with analyzer, level recorder, tape recorder.

使用電源

DC 9V battery x 2 PCs or equivalent,heavy duty or alkaline type.

消耗電流

Approx. DC 17mA.

0℃  to 50℃

Less than 80% RH

260×87×36 mm

450 g.（including battery）

Instruction Manual .................................................... 1 PC
Carrying case............................................................ 1 PC

94 dB Sound Calibrator, model : SC-940, model : SC-941