Blanking The F L Y-Back During Wobbling; Sweep Width - Philips PM5324 Instruction Manual

- Measure the voltage at output H F OUT (e.g. with i nstrument
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 F L Y-BAC K DU R I N G WOBB L I N G
- Conn ect an osc i l l oscope to output HF OUT; o sc i l loscope sett i ngs
Trigger the osc i l l oscope from connector 1 k H z/SW E E P OUT
- Turn control HF A M P l i T U D E fu l l y
- Press range button
- The osc i l l oscope must show t h e picture i l l ustrated i n F ig. 29.
- Set the ampl itude control of the osc i l l oscope to 5 mV/d iv . ; no H F signal shuuld be seen on the zero l in e .
3. 5. 8. SWE EP W I 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 l e poi nter to 0.46 M Hz
- R elease a l l mode buttons
- Set the frequency of the aux i l iary h.f.-generator to the frequency of the i nstrument to be tested- slow ru n n i ng
Lissajous figure
- Press button WOB .
- I n the m iddle of the picture an i nterference mark (frequency mark) f o appears
- Set the frequency of the Lf.-generator, with which the aux i l iary h.f.-generator is mod u lated (a.m . ) , to 20 k H z
- The side-band frequency marks B and C appear; i f necessary, sl ightly vary t h e frequency o f t h e aux i l iary
h.f.-generator; the d i stance of the frequency m arks B and C correspond to twice the frequency of the I .f.­
generator
:- Determ i n e the frequency sweep and the asymmetry and compare with the data g iven in tab l e 2 .
I f necessary, correct with adjusting element 607 o n u n it 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
- R elease mode buttons
- Set the frequency of the a u x i l 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 f o (A) appears
- Set the frequency of the Lf. generator, with which the a u x i l iary h .f.-generator is m i x ed (a.m . ) , to
300 k H z (¢. f l .
- The side-band frequency marks
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 i n
I f necessary, correct with adjusting element 609 o r 608 o n u n i t 1
clockwise
. 4 - .5 and mode button WOB .
8
a n d C apperar; if necessary, s l ightly v a r y t h e frequency of t h e aux i l iary
&
2006, Bruel Kjaer)
y� 50 m V /d iv. and X � 5 msec/div.
tabl e
37
2 .