Checking And Adjusting; Supply; Khz Voltage; Square-Wave Voltage - Philips PM5324 Instruction Manual

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3.5.
Chec ki n g a n d a d j u s t i n g

3.5. 1 . SUPPLY

- Connect the generator to a m a i ns voltage of 220 V
- Measure the current consum pt i o n : 58 m A r.m.s. u p to 70 m A r.m .s.
- Measure the voltage between conn ections 1 3 and 6 of u ni t 2: - 1 2 V ± 20 m V .
I f necessary, adjust with potentiometer 638 on u n it 2 .
- Measure t h e voltage between connections 1 2 a n d 6 o f u n i t 2 : - 1 8 V ± 1 00 m V
- Check the ripple voltage between connections 1 3-6 a n d 1 2-6 o f u n i t 2 : ripple voltage should be < 2 m V p _ p
Survey
Con nection Value
( u nit 2 )
1 3 - 6 - 1 2 V ± 20 m V
1 2 - 6 - 1 8 V ± 1 00 m V
3.5.2. 1 kHz - VOLTAG E
- Press button AM/1 k H z
- The voltage at connector 1 k H z/SW E E P O U T (or at separate testing at connection 1 9 of u n i t 2 ) should be
2 V r . m.s. ± 20 mV
Load i m pedance:
Adjust with potentiometer 632 of u n it 2, if necessary
- Check the frequency: 1 k H z ± 200 H z
L oad i m pedance � 1 0 kn
3.5.3. SAWTOOTH VOLTA G E
- Press button WO B .
- T h e voltage at connector 1 k H z/SWE E P O U T (or at separate testing at connection 1 9 o f u n i t 2 ) s h o u l d b e
1 0 V p _ p ± 0.2 V .
Adjust with para l l e l resistors 647//6 1 3 on u n i t 2, if necessary
- Check the voltage at connection 1 4 of u n i t 2: 9 V p _ p up to 1 0. 1 5 V p _ p
L oad connection 1 4 with 22 kn at separate testing (without potentiometer)
- Check the frequency at connection 1 4 of unit 2: 25 H z ± 5 Hz
3.5.4. SQU A R E -WAVE VO LTAG E
- Press button WOB.
- Check the vol tage at connection 9 of u n i t 2 : approx i mately 1 2. 7 V p _ p
- Determine the duty cycle : 0.4 ± 0. 1 ( F ig. 29)
Fig. 29. Functioning of the blanking of the fly-back
R ipple
< 2 m V p _ p
< 2 m V p _ p
�
1 00 kn
5
L oad at separate testing
I L = 7 5 mA R L 1 60 n
=
R L = 1 44 n
I L = 1 25 mA
3
MA8221