APPLICATION'EXAMPLES
General measuring principle
Due to the fact that the output voltage
is
accurate and stable over a large range, gain and sensiti-
vity can be conveniently measured.
It
is
possible to apply the method of "continuous signal supply"
by keeping the output level constant, or the method of "signal tracing". The choice depends mainly
on the importance either of the non-reactive signal supply or of the signal decoupling with low detuning.
The first method
is
subject to matching problems, the second to detuning phenomena.
Fig. 3.3-1 Continuous signal supply
>
Fig. 3.3-2 Signal tracing
Test object
A
I
1
I
'r
r
I I
I
I
I
Usually the transmission characteristic of a selective
test
object
is
measured statically,
i.e.
point by
point.
PM
5326
-
lndicator
i
>
4
?
I
I
-
L--J
Fig. 3.3-3 Static measuring method
Indicator
PM
5326
C
?
Indicator
_j
>
L
f
PM
5326
RF
D
Test object
Test o
bj
ec t
>
I
-,A
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