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ONOSOKKI CF-7200 Procedures Manual

Portable fft analizer
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CF-7200 Portable FFT Analyzer
Noise analysis procedure
ONO SOKKI CO., LTD.

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Summary of Contents for ONOSOKKI CF-7200

  • Page 1 CF-7200 Portable FFT Analyzer Noise analysis procedure ONO SOKKI CO., LTD.

  • Page 2: System Configuration

    3D display. The unit calibration in this document, the analog output of the sound level meter is connected to the CH1 of the CF-7200 and the level range is selected as 100 dB. Throughout this document, the name of any soft key on the screen will be presented in square brackets (e.g., [MAIN]), and the name of any operation button on the panel will be enclosed by single quotation marks (e.g., 'START').
  • Page 3 ■ Operation Flow [1] Input the CAL signal of the Sound Level Meter [2] Turn on the START button [3] Display the spectrum [4] Setting the voltage range and frequency range [5] Unit calibration [6] Measurement and averaging [7] Dual window display [8] Octave display [9] Data reading by search-Peak list [10] Saving data...
  • Page 4 The level range of the sound level meter is selected as 100dB, so -6dB of it is 94dB. The unit calibration of the CF-7200 is to match the overall value of the power spectrum and the displayed value (94dB) on the sound level meter.
  • Page 5 5． Setting the voltage range Use the up and down arrow buttons in the CH1 section on the operation panel to select a proper voltage range in such a way that the 'RANGE OVER' lamp does not turn on and the green lamp is on. (If you consider about the max.
  • Page 6 When the level range of the sound level meter is changed after the unit calibration, it is necessary to change the range of the CF-7200 as well. For example, when the range is changed from 100 dB to 90 dB, the AC out is amplified by +10 dB and outputted.
  • Page 7 How to apply the A-weighting filter It is possible to apply A-weighting filter to the CF-7200 side instead of applying it to the sound level meter. There are two methods as follows. Please be careful not to apply frequency weighting to both sides of sound level meter and CF-7200.
  • Page 8 Frequency A-weighting setting waveform -10. Start the measurement with the ‘START’ button on the operation panel and stop the measurement with the ‘STOP’ button. Perform analysis in the arbitrary frequency range. 7． Measurement and averaging The following description assumes that the measurement will be made using the power spectrum arithmetic averaging function.
  • Page 9 Enter the number of averaging times in the "Average Number" dialog box, which is displayed when [NUM] is set to ON after pressing the soft keys in the order [MAIN] > [ANALYSIS] > [AVERAGE] > [SET]. ① ② ③ ④ Turn on the 'AVG' button on the operation panel, and then press the 'START' button to start the measurement.
  • Page 10 8． Reading data -1. Reading by searching Press the 'SEARCH' button on the operation panel and use the right and left arrow buttons to move the search point. The X and Y values of the search point will be displayed. The up and down arrow buttons are used to more quickly move the search point.
  • Page 11 DS-0221 FFT analysis software, for example. The memory function of the model CF-7200 has been significantly improved. It is now compatible with the CF (extension .dat), txt, and bitmap formats as well as voice memo and image snapshot functions. For details, refer to the reference guide.
  • Page 12 Select the type of the data to be saved. Press the keys in the order [MAIN] > [MEMORY] > [DATA] > [SAVE TYPE]. Then, turn on the [TEXT] and [BMP] keys. By this, the data will be saved in the txt and bitmap formats, in addition to the CF format, which is always used for the storage.
  • Page 13 10. Reproducing data Press the keys in the order [MAIN] > [MEMORY]. [DATA]. Then, turn on the [LIST] key. This operation will display the list of the data files saved. ① ② ③ Selection cursor The line which displayed icon shows that there is a data. In this example, the data is saved in both TXT and BITMAP formats.
  • Page 14 -1. Insert the USB memory device. The USB icon will appear. The USB icon will appear in the bottom right of the screen. Saving all data ①. Press the keys in the order [MAIN] > [MEMORY] > [UTILITY] > [COPY FILES] > [COPY FILES TYPES].
  • Page 15 Saving selected data sets ①. Press the keys in the order [MAIN] > [MEMORY] > [DATA]. Then, turn on the [COPY] key to show the "Copy Data Memory" window, which is used to copy the memory data. ① ② ③ ②.
  • Page 16 ③. Click the [COPY EXECUTE] key to start copying the data. Removing the USB memory device Press the keys in the order [MAIN] > [MEMORY] > [UTILITY]. Then, turn on the [REMOVE USB Memory] key to disconnect the USB memory device and turn off the USB icon in the bottom right of the screen. ①...
  • Page 17 ① ② ③ ④ 13. 1/3 octave display Octave display function is to display the bundled to 1/3 octave or 1/1 octave data which is based on the power spectrum. The displayed band (frequency band) is changed depending on the frequency range. Also, the displayed highest and lowest bands are insufficient data, so they are for reference.
  • Page 18 The following figure shows the 1/3 octave display in the lower screen and power spectrum in the upper screen. -3 Saving the octave display data Please refer to the “9. Saving data”. When the octave data is saved, an extension of “.dat” is saved the original data of power spectrum.
  • Page 19 15. 3D display -1. Display the power spectrum or 1/3 octave by referring the operation procedure 12. -2. Turn OFF the green light of the ‘AVG’ button of the operation panel to cancel the averaging function. When the ‘AVG’ is turned ON, the averaged data is 3D displayed. -3.
  • Page 20 Example 2: Display of ‘COLOR’ OFF, and ‘DRAW’ ON Example 3: Display of ‘COLOR’ ON (Both ‘DRAW’ ON/OFF are the same) Cross section Y Cross section X 3D + Trace data display switch key 3D + Data display switch key Only 3D display switch key 3D + Data + Trace display switch key When the 3D data area is touched, the cross section of X and Y is displayed.
  • Page 21 -8. Switching the 3D data display format Press the keys in the order [MAIN] > [DISPLAY] > [3D] > [FORMAT] to select the display condition. -9. Saving the 3D data display is possible with “10. Saving data” operation. The spectrum data which is displayed in cross section is saved as “.dat”...
  • Page 22 It is useful when you registered most frequently used key such as “INITIALIZE” key. There are two shortcut registration windows (1/2) in the CF-7200. Each of them can be registered up to 5 keys (10 in total). Those windows can be switched with the tab button.