General; Introduction - Philips PM 5508 Operating Manual

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GENERAL
I. INTRODUCTION
The PHILIPS PAL-colour pattern generator PM 5508 is an all solid state, mains
supplied instrument. bt is intended for use when installing, fault-tracing and re-
pairing colourTV sets operating according to the PAL systems G and I and blackf
white TV sets operating according to the 625 lines CCIR systems B, I, G and H.
The PM 5508 is suited for use with colour-TV receivers of various principles, the
circuits of which could differ in many ways, e.g. R - G - B control of the picture
tube instead of control with (R-Y), (G-Y) and (B-Y) and Y, separation of lumin-
ance and chrominance signal in the video stage instead of with the aid of an
additional I.F. chroma detector, etc.
Therefore the instrument is designed so that it produces ten test signals, by
means of which the complete receiver performance can be checked by simply
observing the patterns on the screen. A complete test will only take a few
minutes. If during this test it is observed that the receiver requires realignment,
the latter can easily and accurately be done with the aid of the generator signals.
Re-adjustments of the delay-line circuit, the chroma-demodulators and the ampli-
tude-ratio of the colour-difference signals can even be carried out by simply
using the screen of the receiver as an i-ndicator.
The instrument moreover has the following features:
— The RF output signal covers the VHF- and UHF ranges.
— Presetting of 4 channels i~n the VHF range and any 4 channels in the UHF
range; instead of one VHF-chamnel, the IF vision carrier can be preset.
— RF output signal continuously adjustable and sufficiently high to supply
several receivers simultaneously.
— Sound carrier can be switched on/off.
Sound carrier can internally be modulated with 1 kHz.