ACO 6236, Instruction Manual, Page: 22 / 154

21
Calibration
You need to calibrate the instrument regularly before you start taking measurements.
There are two types of calibration. One is the way using the internal generator, the other is the
way using the sound calibrator. Note that calibration is disabled when “Peak measurement” is
selected
Calibration using internal generator
You can calibrate the instrument using the internal generator (1kHz, sine wave)
[Cal] key
[Range] key
1) Turn on the POWER.
2) Press [Cal] key.
3) Press [Range] key, and choose ‘100dB’ by cursor keys
▲▼ , and press [Range] key again to
register.
4) Adjust the calibration potentiometer on the side panel until the display shows 94dB.
5) If [Cal] key is pressed once again, the calibration is completed.
＜ Calibration display ＞
＜ Side panel ＞
＜ Reference ＞ Full scale range and Cal(the display shows)
Full scale range
(dB)
CAL
(dB)
OUTPUT （ V ）
AC OUT DC OUT
80 74.0 0.500 2.350
90 84.0 0.500 2.350
100 94.0 0.500 2.350
110 104.0 0.500 2.350
120 114.0 0.500 2.350
130 124.0 0.500 2.350
１０ｍ ０００ｈ００ ｍ ０５ｓ
９４．０
ｄＢ
20 Cal 100
Stp A Fast
L
A
Calibration potentiometer
Cal flashes on and off