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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
..........
.....
.....
.....
.....
""'
1000
2C 1000
C/s
4 ::IOOOA
a
C
Lin.
100
1000
10000
100000Hz
,,.,,2111, • •
c
u..
·
{6(769
Fig. 5.2. Frequency response of a filter measured by the set-up in Fig. 5.1.
constant during a recording. Should, however, the generator impedance not
be small in comparison with the input impedance of the test object, use
should be made of the compressor arrangement. An example showing an
AF filter under examination and utilizing the compressor to obtain a
constant input voltage is shown diagrammatically in Fig. 4.1. Fig. 4.2 shows
the frequency response of a filter measured by this method.
AC Bridge Measurements.
Employing the BFO Type 1013 as signal source and the Electronic Voltmeter
Type 2409 as indicating instrument, AC bridge measurements can he carried
out.
@o
•
~i
!e;
~··
:
~~-
: ~!-
··:
~
!~·:
·
1013
16f77b
Fig. 5.3. BFO Typ
e
1013 used as voltage source for AC bridge measurements.
29
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