Informations sur l'appareil:

Cossor 343 Autre
Modèle: 343
Catégorie: Radio et des communications
Groupe: Autre
Description: Frequency Modulated Ganging Oscillator
                                    The Oscillator and Output-Meter method of alignment served
its purpose well in the days of sets using single tuned
circuits. The fact is well known, however, that from the
first moment that modern superheterodynes using band-pass
intermediate frequency or band-pass pre-selector circuits
were introduced it became imperative to recourse to the
visual method of alignment. Many years' experience in
aligning modern sets in production has confirmed the
necessity for this change.

Whilst the expensive laboratory Signal Generator and
Output-Meter are still required in research work for point
to point determination and absolute selectivity tests, the
less ambitious service equivalents of these instruments
which are generally used do not provide satisfactory results
on production tests and service work. This is particularly
the case when the work has to be done by other than highfy
technical personnel, when the time allowed is limited, and
when the fullest possible information is required from the
test. These limitations of the Output-Meter method obviously
increased as radio development progressed, because technical
improvements in commercial radio receivers qyickly appeared
with which this method could not cope in the light of the
above-mentioned requirements.

The Cossor Research Department had pioneered the development
of Cathode Ray Tubes as far back as 1902, and the increased
complication of modern receiver technique coincided with the
advent of an efficient Cossor sealed-off low voltage Cathode
Ray Tube possessing the required rugged construction and
long life. The recording versatility of this device was
speedily applied to the solution of complex design problems,
to production aligning and eventually to the service testing
of receivers.

The Cossor Company was, in fact, the first to employ this
method in these fields, a step which has been followed
subsequently by many other manufacturers and is now general.
After these many years of experience it has been found
possible to design and construct an equivalent inexpensive
equipment comprising the present-day Oscillograph Model 339
and Ganging Oscillator Model 343. These can be used with
confidence by the Radio Service Engineer not only because
they have been designed by a radio manufacturer who knows
the real requirements of service work, but because they are
a proven proposition and the outcome of years of commercial
testing in the factory.

The equipment fulfils a greater purpose than ganging. It can
be used for a variety of tests on radio sets, and above all,
the instantaneous trace of the Cathode Ray Tube furnishes
the Radio Engineer with the means of actually seeing what is
happening in the electrical circuits he uses, thus providing
the most satisfactory means of fault tracing in radio
receivers. Furthermore, the new Double Beam Tube, by serving
without additional expense or duplication of apparatus, as
the means of investigating simultaneously two independent
effects, has provided a considerable increase in the
versatility of the combined equipment as now offered to the
Radio Engineer.

Ces manuels sont disponibles pour les équipements ci-dessus :

Type de document: Service et Manuel de l'utilisateur Cossor-9318-Manual-Page-1-Picture
Nombre de pages: 42
Taille du fichier: 1.68 Mbytes (1759449 Bytes)
langue: Anglais
Document ID/Numéro:
qualité: Document scanné, tous les lisible.
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