407768 Version 2.0 06/06
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Introduction
Congratulations on your purchase of the Extech 407768 Sound Level Meter. This Auto
Range Sound Level Meter meets ANSI and IEC Type II accuracy standards. Professional
features include programmable Frequency Weighting and Time Response, Min/Max
Memory, Max Hold, Analog output, and RS-232 PC Interface. Careful use of this meter will
provide years of reliable service.
Specifications
Display
5 Digit LCD with overload, low battery and multifunction
indication
Frequency bandwidth
31.5 Hz to 8 KHz
Microphone
0.5” Electret Condensor Microphone
Output terminals
Optically isolated RS-232 port and AC output
Measurement ranges
Auto Range: 30 to 130dB
Manual Ranges: 30 to 80dB, 50 to 100dB, 80 to 130dB
Frequency weighting
‘A’ and ‘C’ (Programmable)
Applicable standards
ANSI / IEC Type 2
Resolution 0.1dB
Maximum/Minimum record
Highest and lowest readings are stored for later recall
Data Hold
Displayed reading is held when HOLD key is pressed
Max Hold
Highest reading displayed only
Response time
Fast: 125ms / Slow:1s (Programmable)
AC Analog output
0.5VAC rms full scale (600
Ω
output impedance)
Power
9V Battery; Consumption: 6mADC approx.
Operating temperature
32 to 122
o
F (0 to 50
o
C)
Operating humidity
Less than 80% RH
Dimensions / Weight
10.6 x 2.7 x 1.1" / 0.63 lbs. (268 x 68 x 29mm / 285g)
Meter Description
1. Microphone
2. LCD
Display
3.
Power, Hold, and Min/Max buttons
4.
Max, Weighting, Response Time, & Range buttons
5.
AC output jack
6. Calibration
potentiometer
7.
RS-232 PC interface jack
8.
Battery compartment, tilt stand,
and tripod mount on rear
