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For the 2308 with OP 1000 recording paper x
1
=
80 mm and
B
P
=
34,7 fTo
As one bandwidth is scanned most quickly at the maximum analysis frequency, this is
the frequency which should be used in equation 6. P should be taken as the maximum
paper speed for reliable analysis. Table 4.2 enables a level recorder paper speed to be
selected for analysis of random signals. For use with the 2308, multiply the paper speed
by 1 ,6 and select the nearest SWEEP RATE setting.
For details of the minimum analysis frequency for reliable analysis, see section 4.
7.
Max.
f(Hz)
63
200
630
2 k
6,3 k
20 k
-;::;
3,16
0,1
0,03
0,01
0,003
0,001
0,0003
I
10
1,0
0,3
0,1
0,03
0,01
0,003
-
. r:.
31,6
10
3
1
0,3
0,1
0,03
+-'
-o
·~
100
-
10
10
3
1
0,3
-o
316
10
10
3
1
c
-
-
ro
a:l
1000
-
-
-
10
10
3
740200
Table 4.2. PAPER SPEED settings (mmls) for AC or DC Recording of
Random Signals
€
<± 10%, logarithmic Sweep
4.3.3. Optimum Scanning Rate - Linear Sweep with 2307
For a linear sweep with constant bandwidth analysis, paper QP 11 02 is used, and this
should be inserted into the Level Recorder. Frequency marking is obtained as described
in section 4.1 .4. The
"x
1 Lin." FREQUENCY SCALE is selected. For this set-up, the rela-
tionship between paper distance
(x)
and frequency (f) is
X
150
f
20. 10
3
mm
since on the
"x
1 Lin." frequency scale, 20kHz corresponds to 150 mm paper throw.
So
But
and
so
dx
7 5 . 1
o-
3
df
dt
,
dt
dx
dt
Paper speed, P mm/s
df
8
dt
T
0
p
8
7 5. 1o-3 -
'
T
D
(7)
47
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