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6221 harmonics

6220, 6221 Current Sources
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ALucente
Posts: 1
Joined: April 10th, 2015, 8:09 am
Country: United States

6221 harmonics

Post by ALucente » April 10th, 2015, 8:37 am

I'm using a model 6221 as an AC current source in a test setup that monitors the system's third harmonic response to a sine wave through a lock-in amplifier. The current source does not seem to supply a clean enough signal for this application. If I apply a current of 10 mA (RMS) to a 25 ohm resistor, there appears to be about 1.7uA of current being supplied at the third harmonic. Is that within specification limits or does the instrument need recalibration?
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brian.d.smith
Keithley Applications
Keithley Applications
Posts: 402
Joined: June 10th, 2013, 6:00 am
Country: United States

Re: 6221 harmonics

Post by brian.d.smith » April 10th, 2015, 7:15 pm

It appears that there is not a spec for THD nor particular harmonic content.
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