Can we add 2 pont voltage calibration? 10.000V reads 9.09V

michar71 / Open-DSO-150

An open source firmware for JYE Tech DSO-150 Digital Storage Oscilloscope

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Can we add 2 pont voltage calibration? 10.000V reads 9.09V #55

Open gregcrago opened 3 years ago

gregcrago commented 3 years ago

Great little tool. I have a AD584LH precision voltage reference did an AUTOCAL and meter set to LOOP and VOLTMETER mode on. Fed 2.500V, displayed 2.28V, fed 5.000V, displayed 4.57V, fed 7.500V displayed 6.85V, fed 10.000V displayed 9.09V. Would a 2 point voltage calibration work better?

gregcrago commented 3 years ago

I loaded the latest OEM firmware 113-15001-120 (Original DSO-150) and used voltage reference mentioned above and turned on display stats. at 2.500V displayed 2.51V, at 5.000V displayed 5.11V, at 7.500V displayed 7.70V, at 10.000V displayed 10.14V. These voltages are closer to the actual voltagesfrom f/w v3.3. Remember the horizontal grid does not match the test waveform (item #50)