AVO - Valve Tester Type 160 - Valve characteristic meter
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AVO Valve Tester Type 160
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Valve Tester Type 160
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Information
Introduction
1. Whilst good/bad testing on a semi-production basis will
undoubtedly be the major use for this tester, it is certain
that the instrument will find considerable use in
laboratories and service departments where engineers and
skilled personnel will be available, and where more precise
details of valve performance can be used to advantage. To
this end, additional facilities on the tester, enable Ia/Va,
Ia/Vs and Ia/Vg characteristics to be plotted over a wide
range of voltages, these being readily available from the
calibrated panel controls.
Principles of Operation
2. The tester is basically designed to check the valve
according to its static characteristics which would normally
require the provision of the requisite range of variable dc
supplies. The difficulty lies in the regulation problems
involved in the supply of the wide range of dc anode and
screen voltages, on which the loading might vary from a
fraction of a mA to over 100 mA, dependent on the type of
valve being tested, and the nature of the test being
performed. Such a requirement could of course be met by the
provision of a number of regulated power supplies, which
would render the instrument cumbersome and expensive, whilst
a large amount of metering, would not only mean additional
expense, but also make the instrument difficult to use, and
would not entirely overcome the problem.
3. It can be shown, however, that if alternating electrode
voltages are applied in their correct proportions, an
amplifying valve can (by virtue of its property of self
rectification) be caused to give dc anode and screen
currents which for all practical purposes bear a constant
relationship to those obtained from its dc static
characteristics.
4. This immediately simplifies the problems of power supply
to the valve under test. The design of transformers to give
negligible regulation errors over the range of secondary
currents involved is comparatively simple, whilst the range
of electrode voltages may be simply provided by a
predetermined secondary tappings selected by calibrated
switches, thus minimising to a very large extent problems of
size, weight and cost, and eliminating the necessity for
separate metering.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
42
Size:
12.7 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
May 10, 2014
MD5:
7664142e-6cb2-bb89-9e82-b712b1821ca0
Downloads:
872