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50
~B
for
€
~
10%
( 5)
This equation can be used to specify 201 0 AVERAGING TIME knob settings for DC re-
cording. These settings are given in Table 4.1. The Level Recorder WRITING SPEED
should be set to "1 000 mm/s" for DC recording. Also given in Table 4.1 are advised Le-
vel Recorder WRITING SPEEDS for AC recording. These should provide suitable restric-
tions of the fluctuations in the level of the recorded signal.
AVERAGING TIME
WRITING SPEED
Bandwidth
DC Recording
AC Recording
(Hz)
(s)
(mm/s)
3,16
10
4
10
3
16
31,6
1
31 ,5
100
0,3
125
316
0,1
315
1000
0,1
800
740201
Table 4. 1. 2010 AVERAGING TIME setting for DC Recording and Le-
vel Recorder WRITING SPEED settings for AC Recording
of Random Signals
e
<± 10%
4.3.2. Optimum Scanning Rate - Logarithmic Sweep
46
On logarithmically graduated paper the
x
displacement of any frequency f is given by
f
X
=
x1
log-
fo
f
loge
x1
In-
fo
where x, is the length (in mm) of one decade and f
0
the starting frequency. By defini-
tion paper speed P is given by
dx
p
-
df
p
dx df
- -
df dt
x 1
loge
B
f
To
For level recorder paper x
1 =
50 mm and
B
p
=
21,7
fT
D
( 6)
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