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Extech Instruments 407764, User Manual

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Extech Instruments 407764 User Manual Download Page 11

Model 407764 Version 1.4  December 2004 

11

Appendix - Typical ‘A’ Weighted Sound Levels 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 
140 
 
 
 
120 
 
 
100 
 
 
 
80 
 
 
 
 60 
 
 
 
 40 
 
 
 
 20 
 
 
 
0 

 

130 

 

      
 
    110 

 

 
 
      90 

 
 
 
 
 
 

      70 

 
 
 

      50 

 
 
 
 
 
 
 
 
 
 
 
 

      30 

 
 
 

10 

 
 
50 HP Siren (100') 
 
Jet take-off (200') 
 
Riveting machine 
 
 
 
Subway (20') 
 
Pneumatic drill (50') 
 
Vacuum cleaner (10') 
 
Large store 
 
Small office 
 
Residential area (night) 
 
 
 
Whisper (5') 
 
Threshold of hearing

 

 

 
 
 
 
 
 
 
Chain saw 
 
 
Boiler room 
 
Freight train (100') 
 
Speech (1') 
 
Large Office 
 
Residence 
 
 
 
 
Sound studio

 

 

Summary of Contents for 407764

Page 1: ...atulations on your purchase of Extech s Datalogging Sound Level Meter The meter is capable of performing all your noise measurements needs in addition to it s capabilities for data acquisition direct data storage to a PC or datalogging data storage to internal memory for later download Data storage enables the user to save data analyze data and generate reports This professional meter with proper ...

Page 2: ...s 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 Op...

Page 3: ...1 External DC 6V power 12 RS 232 interface connector 13 Battery cover 14 Tripod mounting screw 15 Wind screen Figure 1 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 ran...

Page 4: ...e Frequency Weighting Change the Frequency Weighting by pressing the A C button The A or C icon will display on the right hand area of the LCD Note With A weighting selected the meter responds like the human ear boosting and cutting the noise amplitude over the frequency spectrum see Appendix A weighting is used for environmental measurements OSHA regulatory testing law enforcement and workplace d...

Page 5: ...adjust the Sound Level Meter s CAL potentiometer as shown in figure at right to match the Calibrator s output 4 Typically a Sound Level Calibrator will supply 94dB or 114dB at 1KHz Adjust the Sound Level Meter s CAL potentiometer for a 94dB or 114dB LCD display Figure 3 Analog output The 407764 has two analog output jacks located on its right side one for AC and one for DC For DC the meter transmi...

Page 6: ... cleared 6 To Download or Record data via a PC refer to the PC Interface section below PC Interface Connecting the Meter to a PC Refer to Figure 5 Connect the 9 pin male connector to the Sound Level Meter and connect the 9 pin female connector to the 9 pin COM1 PC port If COM1 is used by the mouse connect the 25 pin female connector to the 25 pin COM2 PC port you ll need to use the included 9 to 2...

Page 7: ... Displays the Real Time Clock Setting SAMPLING TIME Display of data acquisition sampling rate Fig 7 PC SAMPLING Opens data acquisition sampling rate selection box Datalogging sample rate is set in the MEMORY Logger window RESET Resets the MIN and MAX stored readings SYSTEM TIME SET Sets the meter s clock to the value of the pc clock SAVE AS Opens the data file storage window dat OPEN FILE Opens th...

Page 8: ...licked downloads and displays the meter s date and time ID CODE Numeric Identification code Enter the code in the box and click on the bar to store the code SAMPLING Datalogger sample rate Enter the sample rate in the box in seconds and click on the SAMPLING bar to store the value NUMBER OF SETS Click on the bar to download the stored data TIME OF RECORDING Click on the bar to display sets downloa...

Page 9: ...ata will be downloaded from meter to PC Save to disk if desired 5 Click the SHOW DATA button for details on each record Figure 13 shows the data list Select SAVE PRINT GRAPH or EXIT from the menu choices Note In the example for Figure 12 there are 3 sets of recorded data in memory Set No 3 has 15 records Note If you need to change the ID CODE or the SAMPLING time click on the desired parameter typ...

Page 10: ...tment at 781 890 7440 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 ...

Page 11: ...80 60 40 20 0 130 110 90 70 50 30 10 50 HP Siren 100 Jet take off 200 Riveting machine Subway 20 Pneumatic drill 50 Vacuum cleaner 10 Large store Small office Residential area night Whisper 5 Threshold of hearing Chain saw Boiler room Freight train 100 Speech 1 Large Office Residence Sound studio ...

Page 12: ...yte year month date hour min sec Set sampling rate Send 3 bytes W high byte low byte leading byte 1 65535 sec Set ID code Send 3 bytes X high byte low byte leading byte 1 65535 Get software version Output V Receive 1 byte 0 255 Get system argument Output Y Receive 10 bytes ID Code 2bytes Version 1 byte ID code 1 byte Data sets 1 byte Last address 3 bytes Sample rate 2 bytes Get time and date Outpu...

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