Hello all,
I am trying to measure the response time (On and off speed) of a photodetector. I use Keithley-4200 with 0 bias (applying light on and off) to measure current with time and calculate response time for on and off (10% to 90 %). In another setting I use Oscilloscope to measure voltage with time and calculate the same response time (on/ off speed). I found significant difference between these two measurements. Does electrical bias (O volt) causing the device to operate faster? What is the best technique to measure speed of the device?
Dear V. Kaphle ,
can you provide more details about the type of measurement you are doing and the differences in results you are observing? One possible explanation for the discrepancies could be the different response speeds of the Keithley compared to the oscilloscope. In general, such measurement devices will not respond instantaneously and also be limited by their internal circuitry. However, oscilloscopes tend to be a better choice to measure transient signals at faster times (i.e. higher frequency), whereas sourcemeters such as a Keithley are typically less suited for such transient measurements. Did you obtain faster response times with the oscilloscope in comparison to the Keithley?
I hope this answers your question.
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