Sound Level Meter
Model 407740 - Digital Sound Level Meter
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The
Extech 407740, Digital Sound Level Meter allows reading of both A and C
frequency weightings to meet IEC 651 Type 2 standards. The wide
30-130dB measurement span is divided into three ranges 30-80, 50-100,
80-130dB to ensure a high accuracy to 1.6. Includes 50dB on each step
with over/under range indication. Large 0.7, 3-1/2 digit LCD displays
resolution from 0.1dB. Max Hold function stores highest reading. Select
either fast 200ms or slow 500ms response time. Utilizes a 0.52
condenser microphone. AC and DC 10mV/dB outputs are standard through a
phone output terminal for connection to an analyzer or recorder.
Includes instructions, 9V battery, carrying case, and 1-year warranty.
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High accuracy to 1.5 dB |
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Read both A and C frequency weightings |
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Meets IEC 651 Type 2 standards |
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3 measuring ranges for greater accuracy |
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Low range 30 to 80dB |
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Medium 50 to 100dB |
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High 80 to 130dB |
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Large 0.7 3-1/2 digit LCD, 0.1dB resolution |
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Max Hold function stores highest reading |
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Fast 200ms or slow 500ms response time |
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Utilizes 0.52 13.2mm condenser microphone |
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AC and DC 10mV/dB outputs standard |
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Complete with 9V battery and carrying case |
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Display
0.7'' (18mm) LCD, 3 1/2 Digits (2000 counts)
Accuracy (at 23 Degrees +/- 5 Degrees C)
1.6% at 94 dB (1 kHz + 1.5 dB after calibration)
Meets IEC-651 type 2
Input Signal Range
''A'' Weighting: 30 to 130 dB (500 to 10 kHz)
''C'' Weighting: 30 to 130 dB (30 to 10kHz)
Response Time
Fast: Response = 200 ms
Slow: Response = 500 ms
Resolution
0.1 dB
Standard Compliance
ANSI and IEC Type 2
Frequency Measurements
31.5 to 8,000 Hz
Microphone
Electric Condenser Microphone, 0.5'' (12.7 mm)
Range Selector Switch
30 to 80 dB, 50 to 100 dB, and 80 to 130 dB (the display provides OVER and UNDER range indication)
External Calibrator
Use EXTECH Model407744
Output Signal
AC: 0.5 Vrms (full scale of selected range)
DC: 0.3 to 1.3 Vdc, 10 mV/dB
Analog Output Terminal
3.5 mm Phone Jack
Power Supply
9 V Battery
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Operating Temperature
32 to 122 Degrees F (0 to 50 Degrees C)
Operating Humidity
Max. 90% RH (0 to 35 Degrees C)
Construction
ABS Resin
Dimensions
Size: 10'' x 2.8'' x 1.1'' (255 x 70 x 28 mm)
Weight:
10 oz (280 g)
Ordering Information
VEX407740: EXTECH Digital Sound Level Meter
VEX407740-NSIT: EXTECH Digital Sound LevelMeter with NIST Traceable Certificate of Calibration
VEX407744: Precision Calibrator, 94 dB forVEX407740
VEX407744-NSIT: Precision Calibrator, 94 dB forVEX407740 with NIST Tracable Certificate of Calibraton
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