Electrical Check; Distortion Of The Sinewave Voltage; Amplitude - Philips PM 5101 Manual

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- Set potentiometer R 18 to the centre position.
- Tum the spindle of double potentiometer RI until the nominal fre­
quency is obtained.
- Set the frequency dial to position 15 and tighten the nut without moving
the spindle of double potentiometer RI.
- Check the frequency di al setting at 1500 Hz.
2. Electrical check
- Set the frequency dial to position 100.
- Set SK3 to position ""'.
- Set SK2 to position x 100.
- Check that the frequency is 10 kHz ± 2% (with the beat frequency
method).
- Set the frequency dial to position 10.
- Check that the frequency is 1kHz
±
2%. If necessary, adjust R18 so
that the frequency inaccuracy is smaller than 2%.
- Set SK2 to position x l k.
- Set the frequency dia1 to position 10.
- Check that the frequency is 10 kHz
±
2% . If necessary, correct the
frequency with C22.
- Set the frequency dial to position 100.
- Check that the frequency is 100 kHz
±
2%. If necessary, correct the
frequency with C1.
- Check the frequency at all ranges in the positions 10, 25, 40, 70 and
100 of the frequency dia!. Tolerance: ± 3% ± 0.7 Hz.
C. DISTORTION OF THE SINEWAVE VOLTAGE
- Set SK3 to position ""'.
- Measure the distortion with a non-linear distortion meter.
The distortion should be smaller than 0.7% at 20 Hz and 100 KHz.
At l kHz the distortion should be smaller than 0.3%.
D. AMPLITUDE
- Set attenuator R2 to position 2.0 V.
- Set SK3 to position ""'.
- Check that the output amplitud e (no 10ad at BU 1-BU2) at all fre­
quencies is 2 V
rms.
If necessary, correct with R26.
- Set SK3 to position
'U .