- 5 -
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
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