Continuity testing device for conducting connection - has low voltage source and stepping up converter with Zener diode in parallel with output

摘要

The device has a supply voltage source. There are two test terminals, and there is a current limiting resistor and a signalling device which delivers a signal when the connection is not broken. The supply voltage source (1) produces a low output voltage. It is followed by a converter (3) which steps up the test voltage. There is a non-linear component, esp. a Zener diode (8). It forms with the current limiting resistor (7) a voltage divider. The non-linear component (8) is connected in parallel with the converter (3) output terminals (4, 5).