37
-
Measure the voltage at output H F OUT (e.g. with instrument
2006, Bruel
&
Kjaer)
-
Adjust the output voltage with potentiometer H F AMP L ITU D E to 50 p.V. Potentiometer H F A M P L I TU D E
should b e i n position 5 0 p. V
3.5.7. BLAN K I N G T H E FLY-BAC K DU R I N G WOBBL I NG
-
Connect an oscill oscope to output HF OUT; osc i l loscope sett i ngs
y�
50 m V /d iv. and X� 5 msec/div.
Trigger the oscilloscope from connector 1 k H z/SW E E P OUT
-
Turn control HF AMPliTUDE fu l l y
clockwise
-
Press range
button
.4
-
.5 and mode button WOB .
- The oscilloscope must show t h e picture i l l ustrated i n F ig. 29.
- Set the ampl itude control of the oscilloscope to 5 mV/d iv . ; no H F signal shuuld be seen on the zero l ine.
3
.
5
.
8. SWE EP WI DTH
3.5.8. 1 . Checking the AM- I F-range
- Set-up the arrangement accord ing to Fig. 3 1
- Press range button .4 - . 5
- Set t h e sca le poi nter to 0.46 M Hz
- Release a l l mode buttons
- Set the frequency of the aux i l iary h.f.-generator to the frequency of the instrument to be tested- slow ru n n i ng
Lissajous figure
- Press button WOB .
- I n the middle of the picture an i nterference mark (frequency mark) fo appears
- Set the frequency of the Lf.-generator, with which the aux il iary h.f.-generator is modulated (a.m . ) , to 20 kHz
- The side-band frequency marks B and C appear; if necessary, sl ightly vary the frequency of the aux i l iary
h.f.-generator; the distance of the frequency m arks B and C correspond to twice the frequency of the I .f.
generator
:- Determine the frequency sweep and the asymmetry and compare with the data g iven in table 2 .
I f necessary, correct with adjusting element 607 o n unit 1 .
3.5.8.2. Checking the FM range
- Set-up the arrangement according to figure 30
- Press range button 1 0.3 - 1 1 . 1 or 75 - 1 1 0
- Set the pointer to 1 0.7 M H z or 96 M H z
- Release mode buttons
- Set the frequency of the auxil iary h.f.-generator to the frequency of the i nstrument to be tested
- Press button WOB.
- In the m iddle of the picture a frequency mark fo (A) appears
- Set the frequency of the Lf. generator, with which the auxil iary h .f.-generator is mixed (a.m . ) , to
300 k H z (¢. fl.
- The side-band frequency marks
8
and C apperar; if necessary, slightly vary the frequency of the aux i l iary
h. f.-generator; the distance of the frequency marks B and C correspond to twice the frequency of the Lf.
generator
-
Determine the frequency sweep and the asymmetry a nd compare with the data given in
table
2 .
I f necessary, correct with adjusting element 609 o r 608 o n unit 1
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 ...
