407750 Datasheet, PDF (2/8 Pages) Extech Instruments Corporation. – Digital Sound Level Meter

Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument for service during or beyond the warranty
period, contact the Customer Service Department at [phone] ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA
number). A Return Authorization (RA) number must be issued before any product is returned to Extech. The
sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper
wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited
to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,
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
Display update rate
Analog Bargraph
Microphone
Measurement Bandwidth
Measurement Range
Accuracy / Resolution
Time response selections
AC and DC Analog outputs
Standards
External Calibrator
Power
Dimensions/weight
Backlit 2000 count LCD with analog bargraph
Main LCD digits: 0.5 seconds; Bargraph: 50mS
1dB steps with 50dB display range
Electret condensor (0.5” diameter)
31.5Hz to 8KHz
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
± 1.5dB / 0.1dB
Fast (125ms) and Slow (1 second)
0.707VAC rms at full scale; 10mVDC / dB;
3.5mm output jacks
Meets ANSI and IEC Type 2
Extech models 407766 or 407744
9V Battery; 20 hour battery life (typical) with low battery
indication
3.2 x 10.1 x 1.5” (80 x 256 x 38mm) / 8.5 oz. (240g)
2
Model 407750 Version 2.1 February 2004