Probe of electrical circuits and radioelements fitter-II. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Probe of electrical circuits and radioelements fitter-II. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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For this probe, the response threshold, on the contrary, is set (by a resistor in the base circuit of the second transistor) at the upper level, i.e. for example, in this diagram, judging by the data of the EWB 5.0a simulation program with some real transistors and a diode at the input: with a 2 kΩ resistor, the circuit operation threshold, depending on the type of diode and transistors, is 600-650 kΩ. Thus, if the resistance of the circuit under study is less than the threshold (~600 kOhm) - the LED is on and shows "short circuit", otherwise, the extinguished LED indicates an OPEN CIRCUIT (or good insulation quality). Threshold, of course, you can choose any.

Probe of electric circuits and radioelements fitter-II

So, to check semiconductor junctions, it is enough to connect the probe alternately in different polarities: if both values \uXNUMXb\uXNUMXbare "short circuit", then there is a "short circuit", if both indications are "CUT", then naturally - a break, and only with different indications - the transition seems to be normal :).

In addition, due to the suppression of pickups by the capacitor in the base circuit of the first transistor and the 100 kΩ limiting resistor - with a probe, you can search for a phase wire in the ~ 220 V network: take the top probe according to the circuit in your hand and, after praying, poke the remaining probe into the socket, the LED will show you , if you guessed correctly with the phase.

The LED lights up permanently if the capacitor under test is broken or has a large leak.

The LED lights up constantly if the source under study has an alternating voltage, and with a constant voltage, the LED lights up when the source is positive on the anode of the input diode.

Publication: cxem.net

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