Archive for the ‘oscilloscopes’ tag
Dual Channel Oscilloscope
How to measure current across collector to emitter (in Common emitter mode) using oscilloscope?
I need to display the transistor characteristics in common emitter mode on an oscilloscope. I feed a staircase waveform to the base and a sawtooth (width = staircase step width) to the collector. I can feed the sawtooth directly from the collector. But how do I feed the Ic to the oscilloscope?
I can't insert a resistor in the Vcc collector path and take the output across that as the oscilloscope Y input has a common ground, which would cause short circuit problems in this case.
One website indicated using the two Y inputs of a dual channel oscilloscope, but did not give any detail. Can any one help ASAP? Thanks in advance.
Bala
You can connect a suitable collector load resistor and measure the collector voltage switching the the scope to a.c.mode.The measured voltage divided by the load resistor would give the collector current.
A look at what is currently available on eBay
 Tektronix T932 Dual Channel Oscilloscope US $25.00 
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 Tektronix TAS465 100 MHZ Dual Channel Oscilloscope with 2 Probes GREAT CONDITION US $249.00
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 HP-54603B OSCILLOSCOPE 60 MHZ DUAL CHANNEL US $495.00
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 LeCroy 9310AL Dual Channel Digital Oscilloscope 9310 US $1,750.00
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 TEKTRONIX 2235A - 100MHz Dual Channel Oscilloscope US $650.00
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 TEKTRONIX 465 - 100 MHZ Dual Channel Oscilloscope - US $400.00
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