The following list of manufacturers and suppliers is intended as a guide for the reader and gives some companies who produce items under the headings given. It is not intended to be a comprehensive listing of any one product. COMPONENTS Capacitors Advance Filmcap Ltd Bosch Ltd Britimpex Ltd A F Bulgin & Co Ltd Cambion Electronic Products Ltd Daly (Condensers) Ltd Dubilier Condenser Co (1925) Ltd Electrautom Ltd Electroustic Ltd Electrosil Ltd Emihus Microcomponents Ltd English Electric Valve Co Ltd ERG Industrial Corporation Ltd Erie Electronics Ltd G E Electronics (London) Ltd Guest International Ltd Hawnt & Co Ltd A H Hunt (Capacitors) Ltd IRC Components Ltd ITT Components Group (Capacitor Division) Impectron Ltd London Electrical Manufacturing Co Ltd Macro-Marketing Ltd Matthey Printed Products Ltd Mullard Ltd Oxley Developments Company Ltd Pedoka Ltd The Plessey Co Ltd (Components Group) RS Components Ltd RIC Capacitors Ltd Salford Electrical Instruments Ltd Siemens (United Kingdom) Ltd Sprague Electric (UK) Ltd Techmation Ltd Product Guide Telephone Manufacturing Co Ltd Townsend-Coates Ltd Union Carbide UK Ltd Vitramon Europe Waycom Ltd Wego Condenser Co Ltd Resistors and Potentiometers A BElectronic Components Ltd Alma Components Ltd B & K Instruments Ltd A F Bulgin & Co Ltd C G S Resistance Co Ltd Colvern Ltd Cressall Manufacturing Co Ltd Davies Integrated Sales Dubilier Condenser Co (1925) Ltd Electrautom Ltd Electroustic Ltd Electrosil Ltd Erie Electronics Ltd G E Electronics Ltd Holsworthy Electronics Ltd ITT Components Group Europe ITT Components Group Europe (Potentiometer Division) Impectron Ltd Lindair Optronics (Industrial) Ltd Litton Precision Products May Precision Components Ltd Morganite Resistors Ltd Mullard Ltd Pedoka Ltd Penny & Giles Ltd The Plessey Co Ltd (Components Group) Power Development Ltd RS Components Ltd Reliance Controls Ltd Salford Electrical Instruments Ltd Sprague Electric (UK) Ltd Walmore Electronics Ltd Waycom Ltd Welwyn Electric Ltd 185
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The following list of manufacturers and suppliers is intended as a guide for the reader and gives some companies who produce items under the headings given. It is not intended to be a comprehensive listing of any one product.
COMPONENTS Capacitors Advance Filmcap Ltd Bosch Ltd Britimpex Ltd A F Bulgin & Co Ltd Cambion Electronic Products Ltd Daly (Condensers) Ltd Dubilier Condenser Co (1925) Ltd Electrautom Ltd Electroustic Ltd Electrosil Ltd Emihus Microcomponents Ltd English Electric Valve Co Ltd ERG Industrial Corporation Ltd Erie Electronics Ltd G E Electronics (London) Ltd Guest International Ltd Hawnt & Co Ltd A H Hunt (Capacitors) Ltd IRC Components Ltd ITT Components Group (Capacitor Division) Impectron Ltd London Electrical Manufacturing Co Ltd Macro-Marketing Ltd Matthey Printed Products Ltd Mullard Ltd Oxley Developments Company Ltd Pedoka Ltd The Plessey Co Ltd (Components Group) RS Components Ltd RIC Capacitors Ltd Salford Electrical Instruments Ltd Siemens (United Kingdom) Ltd Sprague Electric (UK) Ltd Techmation Ltd
Product Guide
Telephone Manufacturing Co Ltd Townsend-Coates Ltd Union Carbide UK Ltd Vitramon Europe Waycom Ltd Wego Condenser Co Ltd
Resistors and Potentiometers A B Electronic Components Ltd Alma Components Ltd B & K Instruments Ltd A F Bulgin & Co Ltd C G S Resistance Co Ltd Colvern Ltd Cressall Manufacturing Co Ltd Davies Integrated Sales Dubilier Condenser Co (1925) Ltd Electrautom Ltd Electroustic Ltd Electrosil Ltd Erie Electronics Ltd G E Electronics Ltd Holsworthy Electronics Ltd ITT Components Group Europe ITT Components Group Europe (Potentiometer
Division) Impectron Ltd Lindair Optronics (Industrial) Ltd Litton Precision Products May Precision Components Ltd Morganite Resistors Ltd Mullard Ltd Pedoka Ltd Penny & Giles Ltd The Plessey Co Ltd (Components Group) Power Development Ltd RS Components Ltd Reliance Controls Ltd Salford Electrical Instruments Ltd Sprague Electric (UK) Ltd Walmore Electronics Ltd Waycom Ltd Welwyn Electric Ltd
185
Coils & Transformers Abrex Electronics Ltd Aladdin Components Amphenol Ltd Astralux Dynamics Ltd Ataka & Co (UK) Ltd Avel Products Ltd Bede Transformer Co Ltd A F Bulgin & Co Ltd Cambion Electronic Products Ltd Clarke & Smith Manufacturing Co Ltd Drake transformers Ltd Dynamo & Electrical Services Ltd ERG Industrial Corporation Ltd Elden Electronics Ltd Electro-Voice Products Ferranti Ltd Foster Transformers Ltd Gardners Transformers Ltd Gresham Transformers Ltd Hinchley Engineering Co Ltd Howells Radio Ltd ITT Components Group Europe ITT Components Group Europe
(Rectifier Product Division) Lambda Electronics Litton Precision Products Mullard Ltd Parmeko Ltd Pedoka Ltd The Plessey Co Ltd (Components Group) Roberts Electronics Ltd Salford Electrical Instruments Ltd Southern Transformer Products Ltd Walmore Electronics Ltd Whiteley Electrical Radio Co Ltd Zenith Electric Co Ltd
Relays Allen West (Brighton) Ltd Alma Components Ltd Arrow Electric Switches Ltd Associated Automation Ltd Astralux Dynamics Ltd B & R Relays Ltd Brookhurst Igranic Ltd Clare (C P) Electronics Ltd Clifford & Snell Ltd Cox Engineering Company Ltd Jack Davis (Relays) Ltd Diamond H Controls Ltd Engel & Gibbs Ltd ERG Industrial CorporatiQn Ltd F R Electronics
(A Division of Flight Refuelling) Hendrey Relays Ltd Impex Electrical Ltd ITT Components Group Europe
186
Keyswitch Relays Ltd Londex Ltd Macro-Marketing Ltd Magnetic Devices Ltd The Marconi Co Ltd G A Stanley Palmer Ltd Parmeko Ltd Pedoka Ltd Oliver Pell Control Ltd The Plessey Co Ltd (Components Group) Simmonds & Robinson Ltd SquareD Ltd Techna (Sales) Ltd Telerelay (Sales) Ltd Thorn Bendix Ltd
(Electrical Components Division) The Valiant Engineering Co Walmore Electronics Ltd Westinghouse Brake & Signal Co Ltd
Printed Circuit Boards ABC Electronics (Oldham) Ltd A B Electronic Components Ltd Bribond Printed Circuits Ltd Circaprint Ltd Cressall Printed Circuits Ltd Davall (S) & Sons Ltd Exacta Circuits Ltd K & N Electronics Ltd Litton Precision Products M B Metals Ltd MEL Equipment Co Ltd Mills & Rockleys (Electronics) Ltd Mullard Ltd Technograph & Telegraph Ltd
Thermionic Valves & Tubes Aero Electronics Ltd Ataka & Co (UK) Ltd Britimpex Ltd Chelmer Valve Co Claude Lyons Cole Electronics Ltd Dale Electronics Ltd EMI-Varian Ltd English Electric Valve Co Ltd Ferranti Ltd Hivac Ltd ITT Components Group Europe Litton Precision Products The M-0 Valve Co Ltd Mullard Ltd Rank Electronic Tubes RCA Ltd (Electric Components Division) Siemens (United Kingdom) Ltd Thorn Radio Valves & Tubes Ltd Twentieth Century Electronics Ltd Walmore Electronics Ltd
Connectors A B Electronic Components Ltd AMP of Great Britain Ltd Amphenol Ltd Aviation Electrical & Radio Ltd Belling & Lee Ltd British Insulated Callender's Cables Ltd DTV Group Ltd Dale Electronics Ltd Duval Electrautom Ltd Emihus Microcomponents Ltd Farnell Electronic Components Ltd Ferranti Ltd Greenpar Engineering Ltd Guest International Ltd ITT Electronic Services Intel Connectors Ltd Klippon Electricals Ltd Lemosa Ltd MB Metals Ltd Macro-Marketing Ltd Metway Electrical Industries Ltd The Plessey Co Ltd (Components Group) Racal Electronics Ltd Radial! Microwave Components Ltd SDS (Portsmouth) Ltd Townsend-Coates Ltd Walmore Electronics Ltd
INSTRUMENTS
Ammeters Anders Electronics Ltd Aveley Electric Ltd Avo Ltd Cole Electronics Ltd Comark Electronics Ltd Graham & White Instruments Hawnt & Co Ltd Hewlett-Packard Ltd Kandem Electrical Ltd Keithley Instruments Ltd Levell Electronics Ltd Record Electrical Co Ltd (The) Salford Electrical Instruments Ltd Sangamo Weston Ltd Sifam Electrical Instrument Co Ltd Sullivan H W Ltd Tinsley H & Co Ltd Turner (Ernest) Electrical Instruments Ltd White Electrical Instrument Co Ltd
Analysers A E P-International Ltd AIM Associates Cambridge Ltd B & K Laboratories Ltd Dale Electtpnics Ltd Davian (Instruments) Ltd Fenlow Electronics Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd ITT Electronics Services Marconi Instruments Ltd Omega Laboratories Ltd Racal Electronics Ltd Servomex Controls Ltd Tektronix UK Ltd
Bridges Automatic Systems Laboratories Ltd Aveley Electric Ltd Avo Ltd (Avo International Division) B & K Laboratories Ltd Cambridge Industrial Instruments Ltd Dale Electronics Ltd Dawe Instruments Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd Kandem Electrical Ltd Leeds & Northrup Ltd Marconi Instruments Ltd Time Electronics Ltd Tinsley H & Co Ltd Sullivan H W Ltd
187
Comparators AIM Electronics Ltd British Physical Laboratories Croydon Precision Instrument Co Darang Electronics Ltd Elcometer Instruments Ltd Electrographic Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd Lyons Instruments Ltd Racal Electronics Ltd Salford Electrical Instruments Ltd Wareham (EM) (Measuring Systems) Ltd
Detectors Automatic Systems Laboratories Ltd Aveley Electric Ltd Avo Ltd (Avo International Division) Brookdeal Electronics Ltd Cole Electronics Ltd Croydon Precision Instrument Co Dawe Instruments Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd Keithley Instruments Ltd Leeds & Northrup Ltd Levell Electronics Ltd Lyons Instruments Ltd Roberts Electronics Ltd Trio Instruments Ltd Turner (Ernest) Electrical Instruments Ltd
Fluxmeters Ancillary Developments Ltd C D C (Great Britain) Ltd Cole Electronics Ltd Control Technology Ltd Elliott Space & Weapon Automation Ltd
(Space & Guided Weapons Division) Sonatest Group of Companies The Varian Associates Ltd
Galvanometers Avo Ltd (Avo International Division) Cambridge Industrial Instruments Ltd Comark Electronics Fluke International Corporation Gallenkamp (A) & Co Ltd Gulton Industries (Britain) Ltd
(West Instrument Division) Hewlett-Packard Ltd Honeywell Ltd Leeds & Northrup Ltd Racal Electronics Ltd Salford Electrical Instruments Ltd Sifam Electrical Instrument Co Ltd Turner (Ernest) Electrical Instruments Ltd White Electrical Instrument Co Ltd
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Signal Generators AIL (Division of Cutler-Hammer) AIM Electronics Ltd AIM Associates Cambridge Ltd Aveley Electric Ltd Avo Ltd Britec Ltd Dale Electronics Ltd Davian (Instruments) Ltd Davies Integrated Sales Dawe Instruments Ltd Farnell Instruments Ltd Feedback Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd Marconi Instruments Ltd Prosser Scientific Instruments Ltd Racal Electronics Ltd Roberts Electronics Ltd Solartron Electronic Group Ltd The Tektronix UK Ltd Texas Instruments Ltd Venner Electronics Ltd
Microammeters Anders Electronics Ltd Bach-Simpson Ltd Cole Electronics Ltd Comark Electronics Ltd Guest International Ltd Hewlett-Packard Ltd Kandem Electrical Ltd M L Industrial Products Ltd
(Electronics Division) Roberts Electronics Ltd Salford Electrical Instruments Ltd Sangamo Weston Ltd Sifam Electrical Instrument Co Ltd Turner (Ernest) Electrical Instruments Ltd Weir Electrical Instrument Co Ltd The
Milliammeters Anders Electronics Ltd Aveley Electric Ltd Cole Electronics Ltd Comark Electronics Ltd Ferranti Ltd Fieldtech Ltd Gallenkamp (A) & Co Ltd Hewlett-Packard Ltd M L Industrial Products Ltd
(Electronics Division) Roberts Electronics Ltd Salford Electrical Instrumeents Ltd Sangamo Weston Ltd Sifam Electrical Instrument Co Ltd Weir Electrical Instrument Co Ltd The
Millivoltmeters A E P International Ltd Aveley Electric Ltd Avo Ltd (Avo International Division) Cambridge Industrial Instruments Ltd Cole Electronics Ltd Davian (Instruments) Ltd Ferranti Ltd Gallenkamp (A) & Co Ltd Guest International Ltd Hewlett-Packard Ltd Honeywell Ltd ITT Electronic Services Marconi Instruments Ltd Racal Electronics Ltd Roberts Electronics Ltd Salford Electrical Instruments Ltd Sangamo Weston Ltd
Bowmar Instrument Ltd Cole Electronics Ltd Dana Electronics Ltd Dynamco Ltd Farnell Instruments Ltd General Radio Co (UK) Ltd Hewlett-Packard Ltd ITT Electronic Services Marconi Instruments Ltd Siemens (United Kingdom) Ltd Solartron Electronic Group Ltd The Walmore Electronics Ltd Weir Electronics Ltd
Wattmeters Anders Electronics Ltd Aveley Electric Ltd
Sifam Electrical Instrument Co Ltd Turner (Ernest) Electrical Instruments Ltd
Avo Ltd (Avo International Division) Bird Electronic Ltd
Oscilloscopes Avo Ltd (Avo International Division) CDC (Great Britain) Ltd Cossor Electronics Ltd Dynamco Ltd Hewlett-Packard Ltd Marconi Instruments Ltd Solartron Electronic Group Ltd The Tektronix UK Ltd Telequipment Ltd
Transistor Test Sets Avo Ltd Britec Ltd General Micronetics Ltd Hewlett-Packard Ltd Labgear Ltd Teradyne UK Ltd
Digital Voltmeters A E P International Ltd Bach-Simpson Ltd Britec Ltd
Frequency Counters A G Brown Electronics Ltd Aveley Electric Ltd Avo Ltd Britec Ltd Darang Electronics Ltd Dawe Instruments Ltd Farnell Instruments Ltd Graham & White Instruments Helga Electronics Ltd Hewlett-Packard Ltd ITT Components Group Europe Marconi Instruments Ltd Plessey Co Ltd The (Electronics Group) Racal Electronics Ltd Technitron Ltd Venner Electronics Ltd
Britimpex ltd 8-12 Rickett Street London SW6 01 385 0883 & 1007
British Insulated Callender's Cables Ltd Chelmer Valve Co Cressall Printed Circuits Ltd P 0 Box No 5 130 New London Road Reddicap Trading Estate 21 Bloomsbury Street Chelmsford Sutton Coldfield London WC1 Essex Warwickshire 01 637 1300 Chelmsford (0245) 55296 021 354 8048
British Physical Laboratories Circaprint Ltd Croydon Precision Instruments Co Radlett 17-21 Foster Street Hampton Road Herts Maid stone Croydon CR9 2RU 01 779 4844 Kent 01 684 4025 & 4094
Maidstone 55484 Brookdeal Electronics Ltd DTV Group Ltd Myron Place C P Clare Electronics Ltd 126 Hamilton Road London SE13 Stonefield Way West Norwood 01 852 7433 South Ruislip London SE27
Middlesex 01 670 6166 Brookdeal Electronics Ltd 01 8451288 Market Street Dale Electronics Ltd Brack nell Clarke & Smith Manufacturing Co Ltd 109 Jermyn Street Berks Melbourne Works London SW1 Bracknell 23931/5 Melbourne Road 01 930 0725
C D C (Great Britain) Ltd Romford 62222 S Davall & Sons Ltd Terminal House Wadsworth Road Grosvenor Gardens Comark Electronics Ltd Perivale London SW1 Brookside Avenue Greenford 01 730 8271 Rustington Middlesex
Sussex 01 998 1011 CGS Resistance Co Ltd Rustington 3147/8 Marsh Lane Jack Davies (Relays) Ltd Gosport Street Control Technology Ltd 9-1 0 Mallow Street Lymington 44 Meeching Road Old Street Hampshire New haven London EC1 Lymington (059 07) 3282 Sussex 01 253 3661
Fieldtech Ltd No 2 Maintenance Area London (Heathrow) Airport Hounslow Middlesex 01 759 2811
Fluke International Corporation Garnett Close Watford WD2 4TT Herts Watford 27769
Foster Transformers Ltd Morden Road London SW19 01 542 2211
G E Electronics (London) Ltd Earply House 182/184 Campden Hill Road Kensington London W8 01 727 0711/3 & 5008
GEC Semiconductors Ltd Helga Electronics Ltd ITT Components Group (Capacitor Witham Ann Street Brixham Road Division) Essex South Bank Paignton Witham (077 833) 3401 Teesside Devon
Eston Grange 4691 Paignton (0803) 50762 A Gallenkamp & Co Ltd PO Box No 290 Hendry Relays Ltd ITT Components Group Europe Technico House 390-394 Bath Road (Rectifier Products Division) Christopher Street Slough Edinburgh Way London EC2 Buck i nghamshire Harlow 01 247 3211 Burnham 4611 Essex
Harlow (027 96) 26811 Gardners Transformers Ltd Hewlett-Packard Ltd Somerford Road 224 Bath Road ITT Components Group Europe Christchurch Slough (Potentiometer Division) Hants BH23 3PN Bucks Broad Lane Christchurch 2284 Slough 33341 Leeds 13
Yorkshire Graham & White Instruments
Hinchley Engineering Co ltd Pudsey (097 35) 77261 82 London Road
Pans Lane St Albans Devizes ITT Components Group Europe
Herts Wiltshire (Valve Product Division)
St Albans 59373 & 58422 Devizes 3573 Brixham Road
General Micronetics ltd Paignton
Boundary House Hird-Brown Ltd Devon
Boston Road Lever Street Paignton (0803) 50762
London W7 Bolton 01 567 8092 Lancashire ITT Electronic Services
Bolton (0204) 27311 Edinburgh Way General Radio Co (UK) ltd Harlow Cores End Road Hivac Ltd Essex Bourne End Stonefield Way Harlow (027 96) 26777 Bucks South Ruislip Bourne End 22567 Middlesex lmpectron Ltd
01 845 1288 23-31 King Street Greenpar Engineering Ltd London W3
01 568 9191 1-6 Gresse Street Guest International Ltd London W1P 1DF Nicholas House Howells Radio Ltd 01 637 1151 Brigstock Road Carlton Street Thornton Heath Manchester 14 Jermyn Industries Surrey CR4 7JA Lancashire Vestry Estate 01 684 9731 061 226 3411 Sevenoaks
Kent Gulton Industries (Britain) Ltd A H Hunt (Capacitors) Ltd Sevenoaks (0732) 51174 (West Instrument Division) Vulcan Way The Hyde New Addington K & N Electronics Ltd Brighton BN2 4JU Croydon CR9 OBH Cordwallis Street Sussex Surrey Maidenhead Brighton 66271 Lodge Hill (503) 2661 Berkshire
Weir Electronics Ltd Durban Road Bognor Regis Sussex Bognor Regis 5991
Welwyn Electric Ltd Bedlington Northumberland Bedlington (067 082) 2181/9
Westinghouse Brake & Signal Co Ltd 82 York Way Kings Cross London N1 01 837 6432
White Electrical Instruments Co Ltd Spring Lane Malvern Link Worcestersh ire Malvern 3218/9
Whiteley Electrical Radio Co Ltd Victoria Street Mansfield Nottinghamshire Mansfield (0623) 24762/5
Zenith Electric Co Ltd Pinecrest Works Cranfield Road Wavendon Bedford shire Woburn Sands (090 84) 2531/7
Accelerating voltage: (electronics, oscilloscopes) the cathode-to-viewingscreen voltage applied to a cathoderay tube for the purpose of accelerating the electron beam.
Air cored coils: (electronics) coils with no magnetic material used in their construction; include coils wound on non-magnetic formers as well as airspaced coils.
Alpha cut-off: (electronics, semi-conductors) that frequency at the point at which the current gain of a transistor has fallen to 0·7 of its low frequency value.
Alternate mode: (electronics, oscilloscopes) a means of displaying output signals of two or more channels by switching the channels, in sequence, after each sweep.
Anderson bridge: (electronics) a modified form of Maxwell bridge used for measuring inductance in terms of capacitance and resistance.
A.Q.L.: (electronics) a point on the operating characteristic of a sampling scheme which defines the quality level at which there is a reasonable probability (usually 0·95) that the lot will be passed as acceptable by the sampling scheme.
Audio frequency choke: (electronics) an iron-cored inductor designed to offer high resistance to audio frequency signals.
Automatic triggering: (electronics, oscilloscopes) a mode of triggering in which one or more of the triggering circuit controls are preset to conditions suitable for automatically displaying repetitive wave-forms. The automatic mode may also provide a recurrent sweep in the absence of triggering signals.
Auto transformer: (electronics) a wound transformer in which part of the winding is common to both the primary and secondary windings.
Bandwidth: (electronics) a statement of the frequencies defining the upper and lower limits of a frequency spectrum where the amplitude response of an amplifier to a sinusoidal waveform
Glossary
becomes 0·707 (-3dB) of the amplitude of a reference frequency. When only one number appears, it is taken as the upper limit.
Capacitor coupling impedance: a characteristic of capacitors having more than one capacitance element in a single container; a measure of the transfer of signal from one element to another.
Capacitor power factor: defined as the proportion of the applied a.c. signal which is dissipated as heat in the component.
Carbon composition resistors: the basic element of resistors manufactured from a mixture of carbon and resinous material. The form of the element may be either a block of the material usually moulded, or in the case of potentiometers it may be deposited in film form on a substrate.
Cavity Q: (electronic microwave devices) cavity Q is defined as 2n times the ratio of energy stored to the energy dissipated per cycle.
CFR: (electronic tubes) cold filament resistance; an important measurement on valves with multistrand filaments.
Chopped mode: (electronics, oscilloscopes) a time sharing method of displaying output signals of two or more channels with a single cathode ray tube gun, in sequence, at a rate not referenced to the sweep.
Common mode rejection ratio (CMRR): (electronics, oscilloscopes) ratio of the deflection factor for a common-mode signal to the deflection factor for a differential signal.
Common-mode signal: (electronics) the instantaneous algebraic average of two signals applied to a balanced circuit, all signals referred to a common reference.
Common-mode signal maximum: ( electronics) the largest common-mode signal at which the specific commonmode rejection ratio is valid.
Current comparator bridge: a conjugate Kelvin bridge employing the detection of zero flux for the comparison of two resistors.
of Terms
d.c. balance: (electronics, oscilloscopes) an adjustment of circuitry to avoid a change in d.c. level when changing gain.
d. c. drift (stability): (electronics, oscilloscopes) property of retaining defined electrical characteristics for a prescribed period.
d.c. shift: (electronics, oscilloscopes) an error in transient response with a time constant approaching several seconds.
Deflection axis: (electronics, oscilloscopes) the major co-ordinates passing through the centre of viewing area.
Deflection factor: (electronics, oscilloscopes) the ratio of the input signal amplitude to the resultant displacement of the indicating spot (eg volts/division).
Delayed sweep: (electronics, oscilloscopes) a sweep that has been delayed either by a predetermined period or by a period determined by an additional independent variable.
Differential amplifier: an amplifier whose output signal is proportional to the algebraic difference between two input signals.
Dual-beam oscilloscope: an oscilloscope in which the catoode ray tube produces two separate electron beams that may be individually or jointly controlled.
Dual trace: (electronics, oscilloscopes) a mode of operation in which a single beam in a cathode ray tube is shared by two signal channels; see alternate mode and chopped mode.
Dust cored coils: (electronics) coils wound onto composite material made of ferromagnetic particles coated with an insulated binder and compressed.
Electrolytic capacitors: capacitors comprising an oxide film on the surface of the positive electrode with a layer of conducting electrolyte filling the space between the oxide surface and negative electrode.
Ferrite cored coils: (electronics) coils wound on cores of sintered ferrite in which some of the iron is replaced by nickel or manganese.
197
Free-running sweep: (electronics, oscilloscopes) a sweep that runs without being triggered and is not synchronised by an applied signal.
Function generators: a multipurpose electronics signal source usually delivering square wave, triangular wave and sine wave outputs; can also be made to deliver rectangular and sawtooth waveforms.
gm: (electronics, semiconductors) low frequency mutual conductance.
Guarded input: (electronics, instrumentation) means of connecting an input signal to prevent any common mode signal from causing current to flow in the input, thus differences of source impedance do not cause conversion of the common mode signal into a differential signal.
Harmonic distortion: (electronic signal generators) a measure of the impurity of the sine wave output from the generator.
Harmonic generators/frequency multipliers: (electronics) microwave circuits in which power at one frequency is converted to power at an harmonic frequency.
hFE: (electronics, semiconductors) common emitter de forward current gain.
hfe: (electronics, semiconductors) small signal common emitter current gain.
hie: (electronics, semiconductors) small signal common emitter input impedance.
hoe: (electronics, semiconductors) small signal common emitter output impedance
hre: (electronics, semiconductors) small signal common emitter reverse voltage ratio.
Ia: (electronic tubes) direct anode current.
la(cw): (electronic tubes) direct anode current applicable under cw conditions.
lamax: (electronic tubes) maximum direct current (full signal).
lao: (electronic tubes) standing direct anode current (zero signal).
lgt: (electronics, power semiconductors) gate trigger current.
In: electronics, power semicon-dictors) holding current.
I;: (electronic tubes) component of direct current due to ionised gas.
IL: (electronics, power semicon-ductors) latching current.
Ita: (electronic tubes) component of direct current due to ionised gas.
ltk: (electronic tubes) component of direct current due to leakage to cathode.
Input bias current: (electronics, linear integrated circuits) the average of the two input currents.
Input offset current: (electronics, linear integrated circuits) the difference in the currents into the two input terminals with output at zero volts.
Input offset voltage: (electronics, linear integrated circuits) that voltage which must be applied between the input terminals to obtain zero output voltage; may also be defined for the case where two equal resistances are inserted in series with the input leads.
Input RC characteristics: the d.c. resistance and capacitance to ground present at the input of an oscilloscope.
Input resistance: (electronics, linear integrated circuits) the resistance looking into either input terminal with the other grounded.
Input voltage range: (electronics, linear integrated circuits) the range of voltage which, if exceeded on either input terminal, could cause the amplifier to cease functioning properly.
Internal graticule: (electronics, oscilloscopes) a scale for measurement of quantities displayed on the crt whose rulings are a permanent part of the inner surface of the cathode ray tube faceplate.
IRM: (electronics, power semiconductors) peak reverse current.
IT: (electronics, power semiconductors) direct (continuous) on state current (limiting value).
IT(AV): (electronics, power semi-conductors) mean on state current (limiting value), sinusoidal waveform 180° conduction, resistive load.
ITRM: (electronics, power semi-conductors) repetitive peak on state current, sinusoidal wave form.
ITSM: (electronics, power semi-conductors) surge (non-repetitive) on state current, sinusoidal waveform, 180° conduction.
Jitter: (electronics, oscilloscopes) an aberration of a repetitive display
indicating instability of the signal or of the oscilloscope; may be random or periodic, and is usually associated with the time axis.
Kelvin double bridge: a variant of the conventional Wheatstone bridge which eliminates errors due to contact and lead resistance and is suited to the measurement of low value resistors.
Laminated iron cored coils: (electronics) coils wound around laminated ferromagnetic material, insulated between layers to reduce eddy current losses.
Large signal voltage gain: (electronics, linear integrated circuits) the ratio of the maximum output voltage swing with load to the change in input voltage required to drive the output from zero to this voltage.
Loaded output voltage: (electronics, transformers) the value of output voltage across each secondary, with the primary connected to an a.c. supply and the secondary loaded to a rated current; ratio of loaded and unloaded output voltages gives transformer regulation.
Magnified sweep: (electronics, oscilloscopes) a sweep whose time per division has been decreased by amplification of the sweep waveform rather than by changing the time constants used to generate it.
Metal film resistor: a resistor whose basic element is a metal film, usually a nickel alloy, which is deposited by wet chemical deposition or by vacuum processes.
Microwave band: (electronics) a commonly-used term for those frequencies falling within the range I GHz to 40 GHz.
Mixed sweep: (electronics, oscilloscopes) in a system having both a delaying sweep and a delayed sweep, a means of displaying the delaying sweep to the delaying pickoff and the delayed sweep beyond that point.
No-load power loss: (electronics, transformers) the power loss (primary copper losses and iron losses) when all secondaries are not loaded.
Output resistance: (electronics, linear integrated circuits) the resistance seen looking into the output terminal with the output at null; this parameter is defined only under small signal conditions at frequencies above a few hundred cycles to eliminate the influence of drift and thermal feedback.
Output voltage swing: (electronics, linear integrated circuits) the peak output swing, referred to zero, that can be obtained without clipping.
Owen bridge: (electronics) a bridge widely used for the LF measurement of inductance on laminated iron core inductors.
Oxide film resistor: a resistor whose basic element is tin-oxide deposited at high temperature and containing
'doping' elements of boron or antimony, to control the properties of the film.
Parametric amplifier: (electronics) a low noise amplifier used at microwave frequencies.
Pirani test: a test undertaken on the heater element of electronic valves; indicates the presence of gas as well as any broken filaments.
Power consumption: (electronics, linear integrated circuits) the d.c. power required to operate the amplifier with the output at zero and with no load current.
Preferred values: (electronics, resistors) to minimise the number of different resistance values used, and hence the manufacturing costs, certain values are used wherever possible.
Pseudo-random noise generator: an electronics test instrument generating a noise signal whose pattern is repeated continuously, each cycle of the noise having carefully controlled characteristics.
Pulse droop: (electronics) the percentage of the amplitude by which the high or low voltage level sags during the period of the pulse.
PuJse jitter: (electronics) random variations of pulse width or delay usually expressed as a percentage of the pulse width or delay.
Pulse width: (electronics) the duration of a pulse, timed between 50% levels on the leading and trailing edges.
Pulse width and delay generator: (electronics) a monostable or single pulse generating circuit which is triggered from the trailing edge of the clock pulse, or the pulse from another pulse width generator.
Pyrolytic carbon film resistor: a resistor whose basic element is pure carbon formed by a 'cracking' process during which the carbon is deposited at high temperature on the substrate.
rbb': (electronics, semiconductors) extrinsic base resistance.
Risetime: (electronics, oscilloscopes) the interval between the instants at which the pulse amplitude first reaches specified lower and upper limits. Unless otherwise stated, these limits shall be 10% and 90% of the pulse's amplitude.
r.: (electronics, semiconductors) dynamic slope resistance of a zener diode.
Self-resonant frequency: (electronics, inductors) the natural frequency at which an inductor resonates resulting
from the effects of self-inductance and self-capacitance.
Sine wave sources: a general electronics term covering instruments such as test oscillators and signal generators from which a sine save signal is available.
Single sweep: (electronics, oscilloscopes) operating mode for a triggered-sweep oscilloscope in which the sweep must be reset for each operation thus preventing unwanted multiple displays.
Smith's chart: (electronics) a transmission line impedance chart.
Supply voltage rejection ratio: (electronics. linear integrated circuits) the ratio of the change in input offset voltage to the change in supply voltage producing it.
Sweep: (electronics, oscilloscopes) an independent variable of a display; unless otherwise specified, this variable is a linear function of time, but may be any quantity that varies in a definable manner.
Sweep hold off: (electronics, oscilloscopes) the interval between sweeps during which the sweep and/or trigger circuits are inhibited.
Test oscillator: an instrument generating test signals over a fairly narrow frequency band with very good frequency and amplitude stability and very little distortion.
tr: (electronics, semiconductors) transient fall time.
9Ja: (electronics, semiconductors): thermal resistance from junction to air.
9ic: (electronics, semiconductors) thermal resistance from junction to case.
Time base: (electronics, oscilloscopes) the sweep generator in an oscilloscope that generates the time function, which is usually linear and expressed in sec/em.
Time base accuracy: (electronics, oscilloscopes) accuracy of the time base usually expressed in terms of average rate error as a percent of full scale.
tq: (electronics, power semiconductors) circuit commutated turn off time.
Truth table: a table drawn-up for an electronic logic circuit which shows the Ol,ltput state of that circuit for every combination of input signal.
Transformer input current: the current drawn from an a.c. supply when the transformer secondary windings are
either loaded or not loaded with their rated currents.
T-R ceUs: (electronics) transmit-receive devices, are used for receiver protection and switching.
Trigger: (electronics, oscilloscopes) a pulse used to initiate some function.
Triggering level: (electronics, oscilloscopes) the instantaneous level of a triggering signal at which a trigger is to be generated.
Triggering slope: (electronics, oscilloscopes) the positive going ( + slope) or negative slope (- slope) portion of a triggering signal from which a trigger is to be derived.
Varactor diodes: (electronics) a broad class of semiconductor diodes used for electronic tuning, harmonic generation and parametric amplification.
VBE: (electronics, semiconductors) common emitter unsaturated base emitter voltage.
VBE(sat): (electronics, semiconductors) common emitter base saturation voltage.
VcBo: (electronics, semiconductors) collector base breakdown voltage.
VcE<sat): (electronics, semiconductors) common emitter collector saturation voltage.