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| Rigol MSO5000 - Bode Plot curiosity |
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| 6SN7WGTB:
I am looking at a single transistor gain stage - BC546C. 10mV RMS signal in at 1kHz initially, 9V single supply. Gain is 18dB. Nowhere near any sort of clipping. As good as flat in audio range (1µ decoupling front and rear). Inverting as you would expect. Thought I would try a Bode Plot of gain and freq response - initially just 20Hz - 20kHz. "in" is CH1, "Out" is CH2, and G1 SG is enabled when I do the sweep. The gain 'curve' reports correctly as flat and indeed 18dB (and FWIW if I do sweep up to e.g. 2MHz, gain drops off as I'd expect). The phase angle plot has multiple spikes where it changes from -180˚ to +180˚. Which is not correct. As I watch the sweep of CH1 an dCH2 happening behind the Bode plot they confirm the output remains inverted. What am I doing wrong?! |
| Martin72:
Pics please... ;) |
| 6SN7WGTB:
Here you go... |
| mawyatt:
See if the DSO has Phase Wrap or Unwrap feature. Best |
| 6SN7WGTB:
--- Quote from: mawyatt on January 02, 2023, 08:28:29 pm ---See if the DSO has Phase Wrap or Unwrap feature. Best --- End quote --- Sorry to appear ignorant, but I have no idea what that is? |
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