Hi brianIf you have an oscilloscope you can very easily make your own curve tracer to experiment yourself. If you have a timebase (X) output, use it to provide the voltage and use the normal Y input(s) to monitor currents. It maybe as simple as one resistor and two probes needed for a simple check. Obviously, you need a little more circuitry to take accurate measurements but to prove a point it should suffice. Note that the body diode in a MOSFET is not conducting in normal forward operation, it would be a useless component if it did! The MOSFET curve would be shown in one polarity and the diode in the other.
Brian.
can it detect fake components for me?, such as fake mosfet or fake IGBT?
Using this device with oscilloscope capable of testing electronic components?Curve tracing/testing typically force current or V and make DC measurements. More advanced
also do AC work.
MOSFET testing :
Simple but effective Transistor Curve Tracer circuit.
Transistor curve tracer simple circuit schematics DIY print layout NPN PNP Germanium diode curveswww.eddybergman.com
Regards, Dana.
So expensive for me, curve tracer with oscilloscope not do that job with some study from my side?like a HP414x / 415x semiconductor parameter analyzer
(presuming high voltage >40V / 80V not needed).
That only occurs if you power the drain-source terminals with the wrong polarity, which then forward-biases the body diode.For ex: if testing power mosfet and the mosfet have built in doide " Body Doide", the tracer give the doide shape, for me means that the tracer only see the doide,
These days someone in the market for an inexpensive oscilloscope might find it in a few places. There's:So expensive for me, curve tracer with oscilloscope not do that job with some study from my side?
I am talking about curve tracer not oscilloscope, the oscilloscope I do have my ownWhen building your own, expect half of the work to be calibrating switches and knobs.
This can be plot on curve tracer screen?, so I know that my mosfet is good?Below is the LTspice sim of an N-MOSFET curve-tracer type characteristic-curve display:
You would reverse both source polarities for a P-MOSFET.
I forgot we're focussing on curve tracers. For those, projects also turn up on the internet. Or for building simple circuits which apply various ranges of voltage to a component. Or various ranges of two different voltages to more than one terminal of a component.I am talking about curve tracer not oscilloscope, the oscilloscope I do have my own
So what exactly is the need - to actually test devices ongoing? Or to demonstrate use of an instrument (of specific type or not)?
Yes, that would be similar to the screen plot on the curve tracer for a good MOSFET.This can be plot on curve tracer screen?, so I know that my mosfet is good?
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