AVO Valve Tester Type 160 Metros característica da válvula
Fabricante:
Modelo:
Valve Tester Type 160
Data:
0
Categoria:
Grupo:
Descrição:
Valve Tester

Informação

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.

mostrar mais

Serviço e Manual do Usuário
Tipo de manual:
Serviço e Manual do Usuário
Páginas:
42
Tamanho:
12.66 Mbytes (13269970 Bytes)
Idioma:
english
Revisão:
ID de manual:
Data:
Qualidade:
Scaned documento, todas legível.
Data de upload:
2014 05 10
MD5:
7664142e6cb2bb899e82b712b1821ca0
Downloads:
1070

Informação

Summary of Data .. .. .. .. .. .. .. ,. .. 3 CHAPTER 1. TECHNICAL DESCRIPTION 1 Introduction .. .. .. .. .. .. .. .. .. .. 5 2— 9 Principles of operation .. .. .. .. .. .. .. .. 5 10—21 Basic Circuits .. .. .. .. .. .. .. .. .. 6 22—25 The Valve Holder Panel .. .. .. .. .. .. .. .. 11 26 General Construction .. .. .. .. .. .. .. .. 13 27 Mains Supply .. .. .. .. .. .. ,. .. .. 13 CHAPTER 2. THE VALVE PANEL AND Control Unit Λ 28—33 The Valve Panel and Selector Switch .. .. .. .. .. .. 14 34—36 Procedure for setting up Valve Base Connections .. .. .. .. 15 37 Provision for new Valve Bases .. .. .. .. .. .. .. 17 38 The Control Unit and its Function .. .. .. .. .. .. 17 39—41 The Mains Voltage Selector .. .. .. .. .. .. .. 17 42—47 The Circuit Selector . . .. .. .. .. .. .. .. .. 18 48 The Electrode Selector .. .. .. .. .. .. .. .. 18 49 The Heater Voltage Switches .. .. .. .. .. 18 50 The Anode and Screen Voltage Switches .. .. .. .. .. 19 51—52 The Anode Current Controls .. .. .. .. .. .. .. 19 53 The Negative Grid Volts Control .. .. .. .. .. .. .. 20 54 The Set mA/V Control .. .. .. .. .. .. .. 20 CHAPTER 3. OPERATING INSTRUCTIONS AND GENERAL PROCEDURE FOR TESTING A VALVE 55 The connection of the instrument to a supply voltage .. .. .. .. 21 56 Final setting of Mains Voltage Selector Panel .. .. .. .. .. 21 57—59 Insulation checks with the valve cold .. .. .. .. .. .. 21 60—61 Insulation checks with the valve hot .. .. .. .. .. 22 62 Cathode to Heater insulation check .. .. .. .. .. .. 23 63—69 Determination of valve condition from Static Characteristic Data .. .. 23 70—71 To check relative goodness of valve in conjunction with coloured comparison SCcilC « * · # « * · « t · * * * * o · mm » a O · (a) Using recommended anode current .. .. .. .. .. .. 24 (b) Using recommended negative grid voltage .. .. .. .. .. 24 72—73 To check valve by direct reading of mutual conductance (mA/V) (a) Using recommended anode current .. .. .. .. .. .. 25 (b) Using recommended negative grid voltage .. .. .. 25 74—75 To check valves having a mutual conductance less than ImA/V .. 25 76—77 Measurement of Grid Current .. .. .. .. .. 26 78—84 Checking Power Rectifiers .. .. .. 26 85 Checking Signal Diodes .. .. .. .. .. 27 86 Instructions for testing specific valve types .. .. .. .. .. 27 87—88 Multiple Diodes and Rectifiers (D, DD, DDD, R, RR) .. .. 27 89—91 Diodes and Rectifiers combined with other electrode assemblies (DT, DDT, DP, DDP, DTP) ... 28 92 Double Triodes and Double Pentodes (TT, PP) ... 28 93—97 Frequency Changers (Η, TH, O, TP) .. .. .. .. .. .. 28 98—99 The use of the Links on the Valve Panel of the instrument .. .. .. 29 100 Checking Tuning Indicators (TI) .. .. .. .. .. .. 30 101 Checking Gasfilled Rectifiers (GR) .. .. .. .. .. .. 30 102 Checking Cold Cathode Rectifiers (CCR) .. .. .. .. 30 APPENDIX 1. SCHEDULE OF SPARE PARTS ... ... 31

mostrar mais