ACO 6226 - Page 17

16
＜Reference＞
Relation between the display value of each range, and output voltage
DISPLAY VALUE（dB） OUTPUT VOLTAGE（V）
RANGE
AC OUT DC OUT
40～130 30～120 20～110 20～100 20～90 20～80
130
120
110
100
90
80
1.00000
2.50000
120 110 100 90 80 70 0.31623 2.25000
110
100
90
80
70
60
0.10
000
2.00000
100
90
80
70
60
50
0.03162
1.75000
90 80 70 60 50 40 0.01000 1.50000
80 70 60 50 40 30 0.00316 1.25000
70
60
50
40
30
20
0.00100
1.00000
60 50 40 30 20
－
0.00032 0.75000
50 40 30 20
－ －
0.00010 0.50000
40 30 20
－ － －
0.00003 0.25000
3－2 Calibration using pistonphone
Frequency weighting key
Time weighting key
Range key
1) Turn on the POWER switch and check basic setting is
Manu
. When peak is on display,
change it to
Manu
mode (to change the setting ,see page P.23〈Display〉).
2) Set the frequency weighting to
C
with
Frequency weighting
key.
3) Set the time weighting to
Fast
with
Time weighting
key.
4) Set the range to
40～130dB
with
Range
key.
5) Switch on the pistonphone.
6) Adjust the calibration potentiometer on the side panel until the display shows a output level
of the pistonphone (standard value is 124.0dB).
For the detail of pistonphone output level, please see shipping inspection data sheet of
the pistonphone.
＜ Calibration display ＞
※
After the calibration of the pistonphone, perform calibration per 3.1 “Calibration using
internal generator” in Page 15. If there is a difference of more than ±0.5 dB for 94.0 dB,
the instrument shall be checked. Please contact ACO or authorized dealer.
00h 000h00m00s
FAST
L C
dB
40 130
124.0
Menu