BRUEL & KJAER 2230 - Page 38

32
Freq. [Hz)
10
100
1000
-30 -20
-10 "FSD"
+10 dB
Signal Level
851158
Fig. 5.6. Lowest frequency for which the error from non linear distor-
tion is less than ± 1 dB
v lMS
+·
, T . , Limit~ at 4% distorti
on
~ lnp~ { SPL 130 dB
! ! : ! !
(150 dB with ZF 0020)
"'
, ..............
....
.......
...... .
.. ......
"
.......
.......
H nput SPL 120 dB (140 dB with ZF :~2~)
, ............ , ........
........
...... .. ....
• ··
......
o. :::.v
j lnpu1 SPL 1 0 dB (13( dE w th Zl
)020)
, .......... , ..
, .. ....... , ....
, ............. ; .....
.......
, ........
, ...........
. ......
... . , ............
, ........
.............. .... .... ; ..... .. ..... , ..
....
2)0
500 kHz
..
'
····· ~
· :., '· ··
'-~(
! ~oo
; ...
''"'.s>
........
.......
f"...
.....
..... ........ .....
......
!·····
...
•· ············
i·
·····
'
....
·········
......
.......... .. ............
• .... ,
~
·········
b~
~
'
..........
..... ......
'
' s
'
"'"
.......
..........
"'
"'-
........
...................
- ~ ···
; .............
. .......
;.. ......
........
, -......,.
i· · ......
' .
. ...
; .......
......
10
2
Frequency (Hz)
840634
Fig. 5. 7. Distortion of the input stage as a function of the cable
length