17
2.3. Application examples
2.3.1. INTRODUCTION
Usual l y the band·pass curve of a certain test object is measured
staticall y
i.e. point
by
point.
lodi'",",
Fig.
6.
Block diagram of the s tatic measuring method
The static method gives very reliable results but is much too time-absorbing.
As mostl y only the shape
must
be determined and not the absolute values of the band-pass curve, the so-cal l ed dynamic method (wobbling)
is preferred.
y
f.m.
PM 5324
Test object
Oscilloscope
I.f.
Fig.
7.
Block diagram of the dynamic measuring method
2.3.2. PREPARATIONS
2.3.2.1. Connection to the mains
- Con nect h.f.-generator P M 5324 according to para. 2.1.2. of the directions for use.
- The test object shou ld be connected to the mains via a separating transformer.
On l y
one
instr ument may be connected to this transformer at the same time.
When measuring at a l l ma,ins receivers or TV sets a separating transformer
must
be used.
- Connect the chassis of the test object to a proper earth.
- Avoid double earthing of the measuring set up.
2.3.2.2. Connection of the signal
The test object may be con nected to the h.f.-generator via the cab l e mentioned below. These cab l es are
optiona l l y avai lable.
- Measuri ng cable BNC
�
4 mm plugs, PM 9 536.
- Measuri ng cab l e BNC
�
BNC, PM 907 5.
-
In the f.m. band, im pedance transformer PM 9 53 7 must be used
to
adapt
the output impedance of the
generator to the input impedance of the test object.
In the a.m. band the dummy aerial of Fig. 8 m ay
be
used to
imitate the
impedance of an' aerial.
1-----------,
I
�
'\.
_______
/
I
/
L
____________
/
MA 8206
Fig.
8.
Dummy aerial
Summary of Contents for PM5324
Page 1: ...HF Generator 100kHz 110MHz PM5324 9452 053 240 1 9499 450 05511 730801 1 01 ...
Page 15: ...14 Fig 4 Front view Fig 5 Rear view ...
Page 43: ...Fig 33 Front view with item numbers Fig 34 Bottom view ...
Page 44: ...44 Fig 35 Top view Fig 36 Left side view ...
Page 45: ...45 0 0 0 0 1 ji I I MAB225 Fig 37 Scale dri ve n ...
