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[ 1 / 3 OCT ] 01 / 07/ 27 14:26:39

31.5

500

125

L W

FAST

75.2 dB

100

Calibration

Use a standard acoustic calibrator such as the Extech 407744 or
407766. Acoustic calibration if often performed on a daily basis to
compensate for any possible changes in microphone sensitivity.

1. Configure the following switch settings.

Display: SLM (L

)

Time weighting: FAST

2. Insert the microphone carefully into the insertion hole of the

calibrator.

3. Turn on the calibrator and adjust its CAL potentiometer so

that the display matches the calibrator output.

4. Note that the 407790 is fully calibrated before shipment.

5. Recommended full recalibration cycle: 1 year.

Measurement Preparation

1. Battery loading: Remove the rear battery cover and insert four 1.5V ‘C’ size batteries.

Take care to observe battery polarity.

2. Battery replacement: When the battery voltage drops below operating voltage,
3. LBATT flashes on the display.

4. AC adaptor connection: Insert the adaptor in the DC 6V jack on the side panel.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Содержание 407790

Страница 1: ...eal Time Octave Band Analyzer Model 407790 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at www TestEquipmentDepot com Back to the Extech 407790 Product Page ...

Страница 2: ... available for chart recorders and other external recording devices Careful use of this device will provide years of reliable service Specifications Applicable Standards IEC 60651 type2 60804 type 2 ANSI S1 4 type2 IEC 1260 1995 Display Backlit LCD 160 160 dot matrix Sound level meter mode Numeric display 4 digits Update rate 0 5 seconds Resolution 0 1 dB Bar graph display 100dB range Update rate ...

Страница 3: ... impedance approx 100Ω Power Four 4 C size 1 5V alkaline batteries External DC power supply 6 Vdc 1A Battery life Approx 2hours Operating Temperature Humidity 32 to 104 o F 0 to 40 10 to 90 RH Storage Temperature Humidity 14 to 140 o F 10 to 60 10 to 90 RH Environment conditions Altitude up to 2000 meters Safety symbol Complies with EMC Dimensions Weight 13 6 H x 4 0 W x 2 4 D 34 5 10 6cm Approx 3...

Страница 4: ...ob 11 LCD backlight on off switch 12 Hand strap 13 RS 232 interface connector 14 Battery compartment 15 Tripod mounting screw FAST L 2k 1 3 OCT 01 06 19 14 26 39 20 40 31 5 Hz 500 125 60 80 dB 100 A W W 8k L 65 2 dB IEC 1260 CLASS2 OFF ON POWER CAL IEC LR14 1 5V X 4 ACCURACY Ó 1 5dB OFF ON DC AC CONTRAST OUTPUT DC6V LIGHT SOUND ANALYZER IEC 651 IEC 804 TYPE 2 1 1 1 3 OCTAVE BAND Test Equipment Dep...

Страница 5: ...ound level meter SLM 1 1 octave frequency analysis 1 1 and 1 3 octave frequency analysis 1 3 MEAS TIME button Sets the Leq LE Lmax and Lmin measurement time 24h 1s 3s 10s 30s 1m 5m 8m 10m 15m 30m 1h 8h 2nd MEAS TIME Enter to setting the date and time mode MEMORY button Enter to memory mode 2nd MEMORY Enter to data record interval time setting 0 no record 1s 3s 10s 30s 1m 5m 8m 10m 15m 30m 1h 62 5m...

Страница 6: ...ore the measurement data RECALL button In manual memory mode press to recall the stored memory data STORE RECALL key Erase memory data Turn off the meter press and hold the STORE and RECALL buttons and then turn on the meter Release buttons when the LCD displays All memory erased ...

Страница 7: ...desired point The frequency and level are then shown on the upper of the screen 68 4 dB 1 1 OCT 01 07 27 14 26 39 50 31 5 125 Hz 30 8k 2k 500 A L 100 dB 70 90 FAST 2k Hz L W 40 60 80 3 1 3 octave analysis screen The staircase shape on the display represents the 1 3 octave analysis result From left the bars correspond to 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2...

Страница 8: ...3 Turn on the calibrator and adjust its CAL potentiometer so that the display matches the calibrator output 4 Note that the 407790 is fully calibrated before shipment 5 Recommended full recalibration cycle 1 year Measurement Preparation 1 Battery loading Remove the rear battery cover and insert four 1 5V C size batteries Take care to observe battery polarity 2 Battery replacement When the battery ...

Страница 9: ...erefore cannot be added together A simple rule is that doubling the amplitude of the noise under test causes the level to rise by 3dB 2 SLM sound level meter Instantaneous sound pressure level SPL is used for spot checks to establish instantaneous noise levels SPL is defined by the logarithmic equation SPL in dB 20 log10 0 P P Where P rms measured sound pressure level P0 rms reference sound pressu...

Страница 10: ...und pressure level measurement screen 70 500 1 1 OCT 01 07 27 14 26 39 125 Hz 31 5 30 50 8k L W 2k A FAST L 90 dB 75 2 dB W 40 60 100 80 1 3 OCT 01 07 27 14 26 39 31 5 Hz 30 50 70 2k 500 125 8k L W A FAST 90 dB L W 75 2 dB 100 60 80 40 3 Use the FREQ WGHT button to select the desired LA LC or LP frequency weighting setting 4 Use the TIME CONST button to select the desired FAST or SLOW time constan...

Страница 11: ... out the following steps 1 Set the power switch to ON and wait until the measurement screen appears 2 Press the MEAS TIME button to set the preset measurement time known as the integral time after which measurement automatically stops There are 13 preset time settings available 1s 10min 3s 15min 10s 30min 30s 1h 1min 8h 5min 24h 8min Note The setting will wrap around from 24h to 1s ...

Страница 12: ...e mark appears on the display and the equivalent continuous sound pressure level measurement begins 8 The following status displays are used in the mode measuring pause or 5 terminate Use the MODE button to select any parameter L Leq LE Lmax or Lmin 9 When the measurement time set in step 2 has elapsed the measurement terminates automatically 10 Terminate the measurement earlier by pressing the PA...

Страница 13: ...ave band sound pressure level measurement screen 3 Press the MEMORY button to enter to memory mode the display shows M 0001 which is the first data record address number 70 1 1 OCT 01 07 27 14 26 39 31 5 Hz 50 30 40 60 2k 500 125 8k L W L FAST dB 90 80 100 W A 75 2 dB 4 Press the STORE button and one set of data will be stored in the 0001 memory address location The address counter is incremented ...

Страница 14: ...0 40 60 2k 500 125 8k L W L FAST dB 90 80 100 W A 75 2 dB 3 Press the 2nd button the 2ND annunciator in the upper left of the screen will display 4 Press the Cursor key to select the memory address of the data to be viewed 5 In the 1 1 or 1 3 octave band screen Press the 2nd button to remove the 2nd annunciator then press the Cursor button the frequency and level values for the desired data points...

Страница 15: ...5ms For example with the rate set to 1 second the display will read P 00 00 01 70 1 1 OCT 01 07 27 14 26 39 31 5 Hz 50 30 40 60 2k 500 125 8k L W L FAST dB 90 80 100 W A 75 2 dB 2 Press the 2nd button the 2ND annunciator will disappear from the screen 3 Use the SLM 1 1 1 3 button to select the desired SLM 1 1 or 1 3 octave band sound pressure level measurement screen 4 Set the preset measurement p...

Страница 16: ... 2 dB CAUTION While automatic datalogging parameter editing is disabled 7 When the preset measurement time has elapsed or the internal memory fills up to maximum capacity press the PAUSE CONT button or press the START STOP button to end the auto datalogging session 8 To retrieve the stored data use the PC interface utility ...

Страница 17: ...30 ID No 00001358 Ver 0 10 SOUND LEVEL METER 1 1 1 3 Octave Band Real Time Analyzer Self Testing OK ALL Memory are Erased 2 Turn off the meter then press and hold down the STORE and the RECALL buttons together Turn on the meter and when the display shows ALL Memory Erased release the keys Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot co...

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