Frequency weighting and time weighting meet IEC 61672 Class 1
DIGITAL SOUND LEVEL METER
Model : SL-4022
FEATURES
* Frequency weighting and time weighting are meet * Max. Hold function for stored the maximum value on display.
IEC 61672 Class 1. * Warning indicator for over and under load.
* Large LCD display, easy to read. * LCD display for low power consumption & clear read-out even
* A & C weighting networks are conformity to standards. in bright ambient light condition.
* FAST & SLOW dynamic characteristic modes. * Used the durable, long-lasting components, including a strong,
* AC output for system expansion. light weight ABS-plastic housing case.
* Build in adj. VR, available for easy calibration. * Compact and heavy duty housing case.
* Condenser microphone for high accuracy & long-term stability. * Low battery indicator.
* Build max. hold reset switch.
SPECIFICATIONS
Display 1 8 mm (0.7") LCD (Liquid Crystal Display), 3 1/2 digits.
Function dB (A & C frequency weighting), Time weighting (Fast, Slow),
Max. hold, Max. hold reset, AC output.
Measurement Range 3 ranges ( 30 - 70 dB, 60 - 100 dB, 90 - 130 dB ),
Resolution 0.1 dB.
Accuracy Frequency weighting meet IEC 61672 Class 1, calibrating input signal on 94 dB the accuracy of frequency
(23 ± 5 ℃) weighting is specified as following:
31.5 Hz : ± 2.0 dB, 63 Hz : ± 1.5 dB, 125 Hz : ± 1.5 dB,
250 Hz : ± 1.4 dB, 500 Hz : ± 1.4 dB, 1 KHz : ± 1.1 dB,
2 KHz : ± 1.6 dB, 4 KHz : ± 1.6 dB, 8 KHz : + 2.1 dB to -3.1 dB,
Frequency Characteristics of A & C.
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 16 KHz. * Accuracy is tested within 31.5 Hz to 8 KHz.
Calibrator B & K (Bruel & kjaer), multi-fuction acoustic calibrator, model : 4226.
Microphone type Electric condenser microphone.
Size of Microphone 1/2 inch standard size.
Range Selector 30 to 70 dB, 60 to 100 dB, 90 to 130 dB, 40 dB on each step,
with over & under range indicating.
Time Weighting Fast - t= 200 ms, Slow - t = 500 ms,
Fast & Slow * "Fast" range is simulated the human ear response time weighting.
(F & S ) "Slow" range is easy to get the average values of vibration sound level.
* The "Fast" & "Slow" time weighting range are designed to IEC 61672 Class 1 requirement.
Output Signal AC output - AC 750 mVrms corresponding to each range step.
Calibration Build in external calibration VR, easy to calibrate on 94 dB level by screw driver.
Internal oscillation system, 1 KHz sine wave generator.
Output Terminal 3.5 mm dia. 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.
Power Supply DC 9V battery x 2 PCs, 006P, MN1604 ( PP3 ) or equivalent, heavy duty or alkaline type.
Power Consumption Approx. DC 17 mA.
Dimension 260 x 87 x 36 mm ( 10.2 x 3.4 x 1.4 inch ).
Weight 450 g/0.99 LB
Standard Instruction Manual............................................................................................................ 1 PC.
Accessories Calibration screw driver.................................................................................................... 1 PC.
Carrying case................................................................................................................... 1 PC.
Optional 94 dB Sound Calibrator, model : SC-941.
Accessories 94/114 dB Sound Calibrator, model : SC-942.
Wind shield ball, model : SB-01.
SOUND LEVEL METER CALIBRATOR, Model : SC-941, SC-942
SPECIFICATIONS
Futures Precision 94 dB/1000 Hz sound calibrator, useful to calibrate Sound Level Meter.
Frequency 1000 Hz ± 2 %.
Sound Pressure Level SC-941 94 dB : ± 0.75 dB.
SC-942 94 dB : ± 0.75 dB, 114 dB : ± 0.9 dB.
Microphone Type 0.5" microphone & 1" microphone.
Size Round 50 mm dia. x 145 mm.
