Lutron SL-4022 Sound Level Meter, IEC 61672 type 1

Lutron SL-4022 Sound Level Meter, IEC 61672 type 1

Features
* Large LCD display, easy to read.
* Frequency weighting networks ( A & C weighting ) & Time weighting ( Fast/Slow ) are designed to meet the IEC 61672 Class 1.
* AC output for system expansion.
* Build in CALIBRATION VR on front panel.
* Changeable condenser microphone for high accuracy & long-term stability.
* Max. Hold function for stored the maximum value on display.
* Build max. hold reset switch.
* 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.
* Low battery indicator.

Specification
Display :18 mm (0.7") LCD (Liquid Crystal Display), 3 1/2 digits.
Function :dB (A & C frequency weighting), Time weighting ( Fast, Slow), Max. hold, AC output.
Measurement :3 ranges :30 - 70 dB, 60 - 100 dB, 90 - 130 dB
Resolution :0.1 dB.
Accuracy (23± 5) ℃ :Frequency weighting ( 31.5 Hz to 16 KHz ) meet IEC 61672 Class 1, calibrating input signal on 94 dB, then the accuracy of A/C 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,
12.5 KHz - + 3.0 dB to -6.0 dB,
16 KHz - + 3.5 dB to -17.0 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 16.0 KHz.
Calibrator :B & K (Bruel & Kjaer) :Multi-fuction acoustic calibrator, model : 4226.
Microphone :Electric condenser microphone
Size of Microphone :0.5 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 & Slow) :Fast - t= 200 ms, Slow - t = 500 ms,
* "Fast" range is simulated the human ear response time.
* "Slow" range is easy to get the avg. values of vibration sound level.
* The "Fast" & "Slow" response range are designed to meet IEC 61672 Class 1 requirement.
Calibration :* Build in external calibration VR on front panel.
* Calibrated via external SOUND CALIBRATOR.
* Calibrated via internal 94 dB/1 KHz generator.
Output Signal :AC output - AC 750 mVrms corresponding to each range step.
Output Terminal :3.5 mm Dia. phone output terminal is provided for connection with analyzer, level recorder, tape recorder.
Operating Temperature :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.
Weight :450 g/0.99 LB .
Dimension :260 x 87 x 36 mm ( 10.2 x 3.4 x 1.4 inch).

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