Extech 407738 Professional Digital Sound Level Meter with Memory


This unit was sparingly used and remained in storage.  The unit is in excellent condition and works great.  It comes with the carrying case, calibration screwdriver, instruction sheet and 3.5mm analog output jack as seen in the pictures.


 

Compliance: ANSI S1.4-1983: type 2; EN 651

Display: LCD

Description: Digital Sound Level Meter with Memory

 

Specifications & Description

Type 2 meter with manual data store and recall of up to 99 readings

High accuracy meets ANSI and IEC type 2 standards

Wide 26dB to 130dB range

Memory to store and recall up to 99 readings

Max/min recording with elapsed time stamp

A&C weighting

Fast and slow response

Large LCD display with analog bargraph

AC and DC analog output

 

Measurement Functions  

Primary Functions Sound Pressure Level

   Maximum Sound Level

   Minimum Sound Level

 Total range  26 to 130dB (32 to 130dB for ‘C’ weighted measurements)

 Maximum level 130dB

Accuracy  ± 1.5dB (under reference conditions) 

 Noise floor   ‘A’ weighting: 26dB

   ‘C’ weighting: 32dB

 Calibration signal 94dB at 1kHz (sinusoidal)

Range selections 26 to 80, 30 to 90, 40 to 100, 50 to 110, 60 to 120, 70 to 130

Frequency range 31.5 to 8000 Hz

Frequency weighting ‘A’ and ‘C’

Time weighting Fast (125ms) and Slow (1 second) Response


Notes on ‘A’ and ‘C’ Frequency Weighting

Use the ‘A’ and ‘C’ buttons to select ‘A’ or ‘C’ frequency weighting. With ‘A’ weighting selected, the frequency response of the meter is similar to the response of the human ear. ‘A’ weighting is commonly used for environmental or hearing conservation programs such as OSHA regulatory testing and noise ordinance law enforcement.

‘C’ weighting is a much flatter response and is suitable for the sound level analysis of machines, engines, etc.

Most noise measurements are performed using 'A' Weighting and SLOW Response.


Notes on ‘FAST’ and ‘SLOW’ Response Time

Use the FAST and SLOW buttons to select a FAST (125 ms) or a SLOW (1 second) response time. Select FAST to capture noise peaks and noises that occur very quickly. Select the SLOW response to monitor a sound source that has a consistent noise level or

to average quickly changing levels. Select SLOW response for most applications.