|
Model No.:
SL-4001 |
Digital Sound Level Meter |
| Features |
* Large LCD display, easy to read
* Frequency weighting networks are designed to meet the IEC 651 type 2
* A & C weighting networks are conformity to standards
* Time weighting(FAST & SLOW) dynamic characteristic modes
* AC/DC output for system expansion
* Build in adj. VR is available for easy calibration
* Condenser microphone for high accuracy & long-term stability
* Max. Hold function for stored the maximum value on display
* Warning indicator for over and under load
* LCD display for low power consumption & clear read-out even in bright ambient light condition
* Used the durable, long-lasting components, including a strong, light weight ABS-plastic housing case
* Small and light weight design allow one hand operation
* Low battery indicator |
| Display |
18mm (0.7") LCD (Liquid Crystal Display), 3 1/2 digits |
| Function |
dB (A & C frequency weighting), Time weighting(Fast, Slow), Max. hold, AC & DC output |
| Measurement Range |
3 ranges, 30 to 130 dB, input signal only |
| Resolution |
0.1 dB |
Accuracy
(23 ± 5 ) |
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 |
Characteristics of A & C
A weighting - The characteristic is simulated as "Human Ear Listing" response. Typical, if making the nvironmental 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. |
0ºC to 50ºC ( 32ºF to 122ºF ) |
| Operating Humidity |
Less than 80% RH |
| Power Supply |
006P DC 9V battery(heavy duty type) |
| Power Consumption |
Approx. DC 6mA |
| Dimension |
205 x 80 x 35 mm ( 8.1 x 3.2 x 1.4 inch) |
| Weight |
280 g/0.62 LB (including battery) |
| Standard Accessories |
Instruction Manual ............... 1 PC
Calibration screw driver.........1 PC |