Application Examples - Philips PM 5326 Instruction Manual

APPLICATION'EXAMPLES
General measuring principle
Due to the fact that the output voltage i s 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
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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 t e s t object is measured statically, i.e. point by
point.
PM 5 3 2 6
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lndicator
i
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4
?
I
I
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L - - J
Fig. 3.3-3 Static measuring method
Indicator
P M 5 3 2 6
C
?
Indicator
_j
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L f
PM 5 3 2 6
RF
D
Test object
Test o bj ec t
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I
-,A