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for afg3102 or any afg - power measurement

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for afg3102 or any afg - power measurement

Post by laygun » February 21st, 2017, 7:50 am

We have AFG3102. I need to drive a non-linear circuit with changing input impedance. Is there a way to measure the inserted power to my circuit.

I need to measure power transfer efficiency. I can measure my output power but couldn't find a way to measure input power.


My circuit: a half wave rectifier
Input signal: Sine wave 4 Vp-p
Typical current less than 10uA

Andrea C
Keithley Applications
Keithley Applications
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Joined: October 15th, 2010, 10:35 am
Country: United States

Re: for afg3102 or any afg - power measurement

Post by Andrea C » February 23rd, 2017, 10:04 am


That is a challenging situation for two reasons:

- the changing input r of the load will play havoc with the afg actual applied voltage to your DUT.
- the low currents are beyond what a current probe and a scope can do for you.

You did not mention the frequencies, but consider placing a shunt resistor in series and use our DMM7510 1MHz digitizer on the voltage across the shunt. You can get your input power from the R and V.


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