Ono Sokki CF-7200 Guía de referencia

ONO SOKKI CO., LTD.

CF-7200 Portable FFT Analyzer

Noise analysis procedure

- 1 -

CF-7200 Portable FFT Analyzer

Noise analysis procedure

To perform noise analysis by using the AC out terminal of the sound level meter, operate unit calibration to enable reading

the same unit as the sound level meter. This document describes the simple calibration method using the CAL signal [1

kHz, 94dB] from the sound level meter. This document also describes the simple method of power spectrum averaging

measurement, octave display, and 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'). In the text, "key"

means a soft key on the screen and "button" means an operation button on the panel.

■ System Configuration

Microphone of the sound level meter

AG-2000 series

Microphone extension cable

Microphone of the sound level meter

Sound Level Meter

CH 1

AX-501 Output cable

- 2 -

■ Operation Flow

■ Buttons on Operation Panel

Change the Y-axis scale

Y: LOG/LIN

AVE (averaging)

START/STOP/PAUSE

SAVE/LOAD

Set to CH1 SPECT (spectrum)

Change the voltage range of CH1

FREQ (frequency range)

Power switch ON

[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

[11] Reproducing data

[12] Copying saved data to a USB memory device

[13] 3D display

[14] Useful functions

- 3 -

■ Operation Procedure

1．Power ON

Press and hold the POWER switch for at least 1 second.

When turning off power, similarly press and hold the power button.

-1. Press the keys in the order [MAIN]> [MEMORY]> [PANEL COND]> [INITIALIZE].

①②③

When the "Yes No" screen is displayed, press "Yes". After a while, the screen will be set up in the default

configuration and the data will be displayed.

-2. Press the 'START' button on the operation panel to set it in the measuring mode. The lamp on the button

will turn on. When any setting is changed, the screen will be promptly updated, facilitating checking of the

setting results.

2．Connecting the Sound Level Meter

Connect the analog output of the sound level meter to the CH1 of the CF-7200 and select C-weighting, then

press CAL button of the sound level meter.

The sound level meter outputs the internal calibration signal. The CAL signal of the sound level meter is

frequency 1 kHz in general. The signal of -6dB is outputted according to the upper limit value of the selected

level range and the dB value of it is displayed. 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.

Notes:

When 1 kHz of calibration signal (sine wave) is used for the calibration, the calibrated value are the same

whichever of the frequency weighting of A, C or Z (flat) is selected. This is because 1 kHz is reference frequency

and 0dB is a reference of the frequency weighting. When you perform calibration with the 250Hz calibrator,

select the frequency weighting of C or Z.

3．Spectrum display

Press the 'SPECT' button of CH1 in the DISPLAY section on the operation panel to display the spectrum.

4．Setting the frequency range

Use the up and down arrow buttons in the FREQ section of the operation panel to select the desired frequency

range as indicated in the upper right corner of the screen. You should first select a wider frequency range to

check the entire spectrum before selecting a suitable range.

The top buttons show the order with which the

buttons were pressed.

- 4 -

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. voltage output, it becomes 1 Vr range.)

6．Unit calibration

-1. Press the keys in the order [MAIN] > [INPUT] > [EU] > [CH1] to turn ON the [Y EU ON] to enable the unit

calibration function. (Default value of unit calibration value is 1.)

①②③④

-2. Press the keys in the order [MAIN] > [INPUT] > [EU] > [CH1] > [SP/EU] to open the SP/EU calibration

screen.

-3. Turn ON the ‘SEARCH’ button on the operation panel and adjust the search marker to the overall value

using the cross key. (See above figure)

-4. Press the keys in the order [MAIN] > [INPUT] > [EU] > [CH1] > [SP/EU] to open the [SET VALUE] setting

screen and input “94 (dB)” which is same as the displayed value on the sound level meter.

① ② ③ ④ ⑤

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The overall value of the calibration screen is changed into “94 dBEU”. Click [CLOSE] to close the

setting screen and return to the power spectrum measurement screen.

-5. Press the keys in the order [MAIN] > [INPUT] > [EU] > [CH1] to open the [Y EU NAME] and

input the arbitrary text, such as [spl (Sound Pressure Level)].

Click the [CLSE] button to close the setting screen. The display of [94 dBSPLr] and EU are

changed to SPL. (SPLr of r stands for effective value. When nothing is entered to the Y EU NAME,

r is not displayed. In this case, it displays 94 dB.)

-6. Adjust the search marker to the overall and check that the value is changed to [94dBSPLr] in the

measurement screen as well.

-7. Press the CAL button of the sound level meter to turn OFF the calibration signal and return to the

measurement state. Set the frequency weighting (A, C or FLAT) and time weighting (FAST) of the sound

level meter for analyzing. There is an analog signal which passes through the frequency weighting (A, C

or FLAT) depending on the type of sound level meter. Be careful with this matter.

-8. When changing the level range of the sound level meter while measuring

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. Set the correction value in the following operation to

“-10dB”. Without this operation, 10dB larger than original value is displayed. It is necessary to perform this

correction operation or another unit calibration when you change the range of the sound level meter. If you

perform correction operation, please do not forget to return to the correction value to 0 dB for the next

measurement.

Press the key in the order [MAIN] > [INPUT] > [EU] > [CH1] to open the [dB CAL] setting screen. Select

[-10dB] from the pull-down menu and click [CLOSE] button to close the setting screen. -10 B correction

has been made to the displayed data.

Overall

① ② ③ ④

- 6 -

-9. 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.

Operation 1: Applying A-weighting filter to the input signal (Analog filter)

The input signal isAD converted by passing through theA-weighting filter.

Press the keys in the order [MAIN] > [INPUT] > [INPUT COND] > [CH1] > [FILTER] and turn ON the [A

WEIGHT].

Operation 2: Applying A-weighting to the power spectrum (Digital filter)

Switching of the display which applies A/ C weighting or not applied any filter is possible in the power

spectrum.

Press the keys in the order [MAIN] > [ANALYSIS] > [FREQ CALC] > [WEIGHT] to turn ON the [A

WEIGHT]. This function is valid for the octave display in the following explanation.

- 7 -

FrequencyA-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.

-1. Press the soft keys in the order [MAIN] > [ANALYSIS] > [AVERAGE] > [MODE], and set [PWR SP] to ON.

① ② ③ ④

-2. Press the keys in the order [MAIN] > [ANALYSIS] > [AVERAGE] > [TYPE], and set [NUM] to ON.

If the averaging is to be specified by the number of averaging times, press the [NUM] key. If it is to be

specified by the time, press the [TIME] key to set it on.

① ② ③ ④

- 8 -

-3. 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

-4. Turn on the 'AVG' button on the operation panel, and then press the 'START' button to start the

measurement.

When the specified number of averaging times has reached, the measurement will stop. When the lamp

on the 'AVG' button is on, it indicates that averaging is enabled. Press the 'STOP' button to interrupt the

measurement.

-5. Pressing the 'START' button will repeat the measurement.

Shows the progress of the averaging process

- 9 -

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.

-2. Peak list display

Press the soft keys in the order [MAIN] >[DISPLAY] >[LIST], and turn on the [ON] key. The set of spectrum

data will be presented in a list. Press the keys in the order [MAIN] >[DISPLAY] >[LIST] >[LIST TYPE], and

turn on [PEAK] to show the peak list.

① ② ③

① ② ③ ④

: Move slowly

: Move quickly

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