Avo Transistor Analyser
Mk 2 Mk II
MK 11 Mark 2 Analyzer
Transistor Tester Mk2 MkII Mk11
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|Avo Transistor Analyser
Mk 2 Mark 2 Analyzer Transistor Tester
The instrument has in general been constructed to meet the requirements of the
United Kingdom Inter-Service Specification K. 114, and will enable measurements to
be made on PNP, NPN and Point Contact transistors.
Range of Collector Volts
Using the Battery Power Unit: 1.5, 3, 4.5, 6, lO.5V of either polarity.
Using an external supply in conjunction with the Battery Power Unit or the Mains
Power Unit on its own:
0-12V of either polarity (for all measurements).
Using an external supply in conjunction with either the Battery Power Unit or the
Mains Power Unit:
0-150V (for dc characteristics, ~ and turnover voltage (VT) only.
Range of Collector Current
0-250mA using the Battery Power Unit.
0-IA using the Mains Power Unit or an external supply.
Range of Base Current -
0-imA and 1-4OmA in two ranges.
Small signal current gain (~)
0-25 and 0-250, in two ranges.
Noise Measurements (NF)
1-40db in two ranges.
Collector Emitter leakage current (Iíco)
First indication 2 micro-amperes.
2.1 Mains Power Unit
The unit provides stabilised outputs for the transistor under test and for the
internal circuits of the Transistor Analyser. It is mechanically and electrically
(except for collector supplies) interchangeable with the battery power unit.
The mains unit operates from mains supplies of 110ól28V or
190ó250V ac, 50/60 c/s. Instructions for changing the voltage tapping are
printed on the side of the mains transformer.
Collector voltage is continuously variable over the range 0.05V to l2V at a collector current of 1 amp. max. The stability of collector voltage is better than Ī 0.25.% for a 10 % change in mains input and the ripple voltage does not exceed
5mV peak to peak.
Overload protection is provided by an electronic cut-out which is pre-set to operate where a collector current of 1.IA is exceeded. This protects both the Transistor Analyser and the Mains Unit, should a transistor under test develop a short circuit. The cut-out may try (a) when changing from voltage to current measurement (b) when the mains unit is switched off and on again (c) when the collector voltage switch is changed from 9ó12 PNP to 9ó12 NPN or vice versa.
This is due to the smoothing capacitors taking current during charging and has no harmful effect. In the event of this happening the cut-out should be reset by depressing the reset button.
An indication that the cut-out has tripped is given by very low values of Vc
and Ic. The instrument may be re-set by depressing the re-set button provided.
As a Download
|The Information Consists
of the Following :-
Symbols and Equivalents used in this Manual
Mains Power Unit
Basic Methods of characteristic checking
Measurement of Iíco, Ic, Ib, Vc & Vcs
Measurement of Beta (/3)
Measurement of Noise (N.F.)
The controls, their functions and operation
Beta and Noise Control
Base current controls
Press Buttons Gain control
Collector Volts control
General procedure for testing a Transistor
Measurement of Iíco
Measurement of Ic, Vc, Ib, /3
To measure Beta (/3)
To measure Noise (N.F.)
To measure Turnover voltage
To measure Saturation voltage (Vcs)
Measurement of líco, Ib, Ic, /3, /3, Vcs and Noise using external supplies
The use of Heat Sinks
Other facilities available
Use of meter for external voltage and current measurements
Use of the internal amplifier
Using the internal oscillator
Checking the condition and replacement of the internal batteries
To check the internal amplifier/oscillator batteries
To check the condition of the internal supplies for the transistor under test
Replacement of internal batteries
Abbreviated Operating Instructions
Schedule of Spare Parts
Basic circuit for the measurement of Beta (/3)
Basic circuit for the measurement of Noise
Layout of the front panel controls
Interior of the instrument
Interior of the Battery Power Unit
/3 to a Conversion Chart
Circuit diagram of Battery Power Unit
Circuit diagram of Mains Power Unit
Circuit diagram of the Transistor Analyser Mk 2
As a Download
Mk 2 MK II MK 11
Mark 2 Analyzer Transistor Tester Mk2 MkII Mk11
Manuals are Available
Worldwide as a Download.
The manual for the MK II should be ok for the
early model with out a mark number
Manual Including Circuits 49 A4 pages worldwide
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