Extech 407736 Instruction Manual

Instruction Manual

MODEL 407736

Digital Sound Level Meter

• 1.5 dB accuracy meets ANSI and IEC 651

Type II standards

• A/C weighting & Fast/Slow response

• Built-in calibration check

• 0.1dB resolution

1. INTRODUCTION

Congratulations on your purchase of the Extech Model 407736 Digital Sound Level Meter. This professional meter, with proper care, will provide years of safe reliable service.

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2. SPECIFICATIONS

Display 3-1/2 digit (2000 count) LCD Display update rate 0.5 seconds Mi crophone 0.5” Electret condensor-type Measurement Bandwidth 31.5Hz to 8KHz Dynamic range 55dB Measurement Range 35 to 130dB

(Lo: 35 to 90; Hi: 75 to 130dB)

Frequency weighting ‘A’ and ‘C’ Applicable standards IEC-651 & ANSI S1.4 Type 2 Accuracy / Resolution ± 1.5dB / 0.1dB Maximum hold decay time <1dB / 3min Response time Fast: 125ms / Slow: 1 second Built-in calibration check 1KHz internal sine wave @ 94dB AC Analog output DC Analog output

0.65VAC rms (full scale); 600Ω output impedance 10mVDC / dB; 100Ω output impedance (approx).

Power 9V Battery (006P or 6F22) Battery life 50 hours typical Operating temperature 32 to 104oF (0 to 40oC) Operating humidity 10 to 90% RH Dimensions/weight 9.45x2.68x1” (240x68x25mm) / 6.75oz (210g)

3. METER DESCRIPTION

1. Microphone

2. LCD display

3. POWER OFF & RANGE select switch

4. RESPONSE & HOLD select switch

5. A/C weighting and Calibration switch

6. Calibration adjust screw for 94dB

7. Reset key (resets max hold reading)

8. AC/DC analog output 3.5mm phone jack

9. Battery compartment on rear of meter

Note: The threaded tripod mount screw hole is on the

center rear of the meter (not shown).

4. METER OPERATION

4.1 Quick Start

1. Power the meter by moving the RANGE switch to the LO or HI range position, the meter will begin measuring sound levels. If the LCD does not display, check the battery.

2. Place the meter on a tripod via the tripod mount on the rear of the meter or hold the meter in hand to take noise measurements.

3. Point the microphone toward the source of the sound level to be measured and view the reading on the meter’s LCD. An indication of ‘OVER’ means that the measurement is out of range, try selecting the other measurement range.

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