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50
In practice, it is found that there is a lower limit to the frequency range for reliable analy-
sis with these settings. See section 4.7 for details.
Max. f(Hz)
63
200
630
2k
6,3 k
20 k
N"
3,16
0,3
0,1
0,03
0,01
0,003
0,001
I
10
3
1
0,3
0,1
0,03
0,01
.r::.
31,6
10
10
3
1
0,3
0,1
~
"C
·~
100
-
10
10
3
1
0,3
"C
316
10
10
3
1
c::
-
-
"'
IXl
1000
-
-
-
10
10
3
I
740202
Table 4.4. PAPER SPEED settings (mm/s) for AC Recording of Deter-
ministic Signals, Logarithmic Sweep
Bandwidth (Hz)
WRITING SPEED
(mm/s)
3,16
125
10
200
31,6
315
100
500
316
500
1000
500
740204
Table 4.5. WRITING SPEEDS for AC Recording of Deterministic Sig-
nals, Logarithmic Sweep, on 2 30
7
DC Recording
For filter response time dominating, equation
11
can be used:
p
82
5,4
f
mm/s
( 11 )
For averaging time dominating, the dwell time is set equal to twice the averaging time
:
For logarithmic paper, such as QP 1142,
21,7 8
Pf
p
8
10,8
Tf
mm/s
AV
( 13)
The above formulae were used to calculate the Level Recorder PAPER SPEEDS required
for a particular analysis maximum frequency and bandwidth. The settings are shown in
Table 4.6. The 2010 AVERAGING TIME settings (from equation 9) are shown in Table
4. 7. When the filter response time dominates, the averaging time is chosen to be as
large as possible, but less than the filter response time. When the averaging time domi-
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