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Component Tester

The Hameg HZ65-3 is a crude device for plotting an I-V graph of a two-lead component either in the front panel sockets or connected via the 4mm banana sockets on the side. If you have a three lead device such as a transistor, then you have to supply the third voltage externally; a storage scope would be very useful when recording the family of curves.

Please don't disconnect the short BNC leads, lest they are lost.

It works by putting a 50Hz voltage varying sinusoidally between -7V and +7V across the DUT, and measuring the current. Since the maximum voltage cannot be changed, there is the possibility of damaging the DUT.

The manual, kept in the box file above the test bench, has some illustrations of different component's I-V curves, but is surprisingly silent about the sensitivity. Measurements indicate that the sensitivity is roughly:

  • voltage: 10V/V, i.e. oscilloscope setting 0.1V/div corresponds to 1V/div across the DUT

  • min current: 10mA/V, i.e. oscilloscope setting 0.1V/div corresponds to 1mA/div

  • medium current: 100mA/V, i.e. oscilloscope setting 0.1V/div corresponds to 10mA/div

  • max current: 50mA/V, i.e. oscilloscope setting 0.1V/div corresponds to 50mA/div

(Or something else; verify it yourself when starting to use it!)

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