Extech 407764, 407764-NIST Instruction Manual
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INSTRUCTION MANUAL
Model 407764
Datalogging Sound Level Meter
• Range: 30dB to 130dB
• 4-digit LCD Display with 0.1dB resolution
• A and C Frequency Weighting
• RS-232 PC Interface with
16,000 point datalogger and
Date / Time Stamp
• Auto-Ranging
1. INTRODUCTION
Congratulations on your purchase of Extech’s Sound Level Meter. This professional meter, with
proper care, will provide years of safe reliable service.
407764 Ver. 1.1 October 2000
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2. SPECIFICATIONS
Applicable Standards IEC651 Type 2, ANSI S1. 4 Type 2
Accuracy ±1.5dB (under reference conditions)
Frequency range 31.5Hz - 8KHz
Measuring level 30 - 130dB
Frequency weighting A and C
Microphone 0.5” Electret condenser microphone
Display 4-digit LCD
Resolution: 0.1dB
Display period: 0.5 sec.
Bargraph 50dB scale (1dB steps). Display period: 50mS; Auto-ranging:
Sampling rate 50mS
Time weighting FAST: 125mS, SLOW: 1 sec.
MAX Maximum reading held
Level ranges 30-80dB, 40-90dB, 50-100dB, 60-110 dB, 70-120dB, 80-130dB
Auto range 30 to 130dB
Linearity range 50dB
Alarm function OVER indicator for readings higher than high limit.
UNDER indicator for readings lower than low limit.
AC output 0.707 Vrms at Full Scale
Output impedance approx. 600Ω
DC output 10mV / dB
Output impedance approx. 100Ω
Power supply Four 1.5V ‘AA’ batteries
Battery life Approx. 30 hrs continuous operation
AC adapter Voltage: 6VDC
Voltage Ripple: < 100mVpp
Supply Current: > 100mADC
Socket: Pin Ground
Casing: Positive
External Diameter: 3.5mm
Operating temperature 32 to 104oF (0 to 40oC)
Operating humidity 10 to 80%RH
Storage temperature 14 to 140oF (-10 to 60oC)
Storage humidity 10 to 80%RH
Memory size 16,000 data records with Date and Time Stamping
RS-232 Interface Baud rate: 9600bps
Dimensions 10.4 x 2.8 x 1.4” (265 × 72 × 35mm
Weight Approx. 11.5 oz. (358g) including battery
Accessories Batteries, carrying case, screwdriver , windscreen, 3.5mm plug, RS-232
100dB scale, 2dB steps
(Total of 6 ranges)
cable , 9- to 25-pin gender charger, WindowsTM Software.
407764 Ver. 1.1 October 2000
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3. METER DESCRIPTION
1. Microphone
2. Display
3. Power Switch
4. Level range control switch
5. MAX hold switch
6. Frequency Weighting switch
7. Response Time select switch
8. AC output terminal
9. DC output terminal
10. CAL (Calibration) pot.
11. External DC 6V power
12. RS-232 Interface Connector
13. Battery Cover
14. Tripod mounting screw
15. Windscreen
(Figure 1)
4. DISPLAY DESCRIPTION
1. Range selection
2. Date information
3. SPL: Instantaneous sound pressure level
4. Low -Battery
5. MAX: Maximum SPL value is held
6. Data recording
7. Measurement value
8. Memory full
9. Units
10. Frequency weighting (A/C)
11. TIME function
12. 50dB level (Bargraph)
13. Over range
14. SLOW time response
15. FAST time response
16. Under range
(Figure 2)
407764 Ver. 1.1 October 2000
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