Extech Extech 407750 Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407750 Product Page

User's Guide

Digital Sound Level Meter
Model 407750

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

whether written or oral, is expressed or implied.

Introduction

Congratulations on your purchase of the Extech 407750. This device measures sound
level in dB and the measurement range can be set automatically or manually. The
407750 offers selectable frequency weighting (‘A’ and ‘C’) and Time Response (Fast and
Slow). The built-in RS-232 PC interface allows the user to record readings onto a PC in
real-time. Careful use of this meter will provide years of reliable service.

Specifications

Display Backlit 2000 count LCD with analog bargraph
Display update rate Main LCD digits: 0.5 seconds; Bargraph: 50mS
Analog Bargraph 1dB steps with 50dB display range
Microphone Electret condensor (0.5” diameter)
Measurement Bandwidth 31.5Hz to 8KHz
Measurement Range A weighting: 30 to 130dB; C weighting: 35 to 130dB

6 ranges in 10 dB steps: 30 to 80dB, 40 to 90dB, 50 to

100dB, 60 to 110dB, 70 to 120dB, 80 to 130dB
Accuracy / Resolution ± 1.5dB / 0.1dB
Time response selections Fast (125ms) and Slow (1 second)
AC and DC Analog outputs 0.707VAC rms at full scale; 10mVDC / dB;

3.5mm output jacks
Standards Meets ANSI and IEC Type 2
External Calibrator Extech models 407766 or 407744
Power 9V Battery; 20 hour battery life (typical) with low battery

Dimensions/weight 3.2 x 10.1 x 1.5” (80 x 256 x 38mm) / 8.5 oz. (240g)

indication

2

Model 407750 Version 2.1 February 2004

Meter Description

1. LCD Display

2. Microphone

3. ON/OFF key

4. REC (Record) key

5. MAXHLD (Max Hold) key

6. C/A Weighting Select key

7. BA (Background Absorber) key

8. F/S Fast / Slow Response select key

9. DOWN

10. Backlit (LCD backlighting) key

11. UPPER

12. AC adaptor jack

13. Calibration screw adjust

14. AC analog output jack

15. DC analog output jack

16. RS-232 output jack

Note: The Battery Compartment and the Threaded Tripod mount access are located on
the back of the instrument (not pictured)

3

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

Model 407750 Version 2.1 February 2004