Continuity tester input protection circuit - has blocking and limiting diodes in series with limiting resistor
DE2915759A1
Electrical tester with contact not specifically hand-held - and mounted on sprung shaft attached to hand-held housing
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Compact pair of electrical probes packaged for portability - are used for voltage or short circuit testing and clamped together, when not in use, by magnets
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Circuit testing device with conductive rubber test terminals - connected to indicator providing meter reading or variable audible tone
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Resistance and voltage tester - generates variable pulses which excite loudspeaker and lamp
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Cable testing device with audio output - has time switched voltage source and latching changeover switch
DE2808869A1
Electric tester with acoustic signalling - has two voltage sources connected by opposite polarity terminals to oscillator
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ELECTRIC TEST DEVICE WITH ACOUSTIC, QUANTITATIVE AND QUALITATIVE ANALOGUE DISPLAY
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Electric signalling unit using several voltage sources - includes interrogation and signalling points, with voltage in former higher than in latter
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Phase sequence testing device in three phase systems - consists of bridge with three resistors and capacitor to shift phase (BR 11.1.77)
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Phase sequence test indicator - includes bridge with optical indicators and controls tone signal for audio monitoring
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Battery supervision system for infrequently used circuits - which automatically tests remaining charge and operating time
DE2406403A1
Cable core identifying device - has sender and receiver with electro-optical transducers for each core
DE2329863A1
Usage prevention for connected electrical plugs - involves fitting lock for temporary change of plug-in profile or lockable enclosure
