Extech 407740 Data Sheet

www.extech.com

6/10/08 - R1

Precision over 3 ranges

From 30 to 130dB

Digital Sound Level Meter

Ordering Information:

407740....................Digital Sound Level Meter

407740-NIST ..........407740 with NIST Certificate

407744....................Precision Calibrator, 94dB for 407740

407744-NIST ..........407744 with NIST Certificate

Features:

• High accuracy to ±1.5 dB

• Read both A and C frequency weightings

meets IEC 651 and ANSI Type 2 standards

• 3 measuring ranges for greater accuracy

Low (30 to 80dB) Medium (50 to 100dB) High (80 to 130dB)

• Large 0.7" 3-1/2 digit LCD, 0.1dB resolution

• Max Hold function stores highest reading

• Fast (200ms) or slow (500ms) response time

• Utilizes 0.52" (13.2)mm condenser microphone

• AC and DC (10mV/dB) outputs are standard

through a phone output terminal for connection to an analyzer or recorder plus tripod mount

• Complete with 9V battery and carrying case

Optional 94dB precision calibrator enables user to calibrate through the microphone

Specifications

Input Signal Range: A Weighting - 30 to 130dB (Freq 500 to 10kHz)

C Weighting - 30 to 130dB (Freq 30 to 10kHz) Resolution: 0.1 dB Accuracy (23° ±5°C): 1.6% at 94dB (1kHz ± 1.5dB after calibration); Meets IEC651 Type 2 Range selector: 30 to 80dB, 50 to 100dB, 80 to 130dB:

50dB on each step with over/under range indication Response: Fast t=200ms, Slow t=500ms

Measurement frequency range: 31.5Hz to 8000Hz

Dimensions: 10 x 2.8 x 1.1" (254 x 71 x 28mm) Weight: 10oz (284g)