Blown AWG Output

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11 years 9 months ago #929 by david_sawatzke
Hello,
today I tried using the AWG of the xProtolab. On the intergrated Oscilloscope it didn't show any Output. I hooked my big analog Oscilloscope up and it showed that the Output signal was very low (0.1 Volt) and looked disturbed. Is there anything I can do to repair the AWG (I've already replaced the - 5V Source before).
David

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11 years 9 months ago - 11 years 9 months ago #931 by ganzziani
Replied by ganzziani on topic Re:Blown AWG Output
Let's check this first:/\r\n//\r\n/1) Make sure the amplitude is set at max on the settings. Set the wave type to sinewave, with a frequency of 1kHz or so./\r\n/2) With your oscilloscope, measure pin 6 of the microcontroller, you should see your waveform with a 2V peak to peak amplitude.
Last edit: 11 years 9 months ago by ganzziani.

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11 years 9 months ago #938 by david_sawatzke
Replied by david_sawatzke on topic Re:Blown AWG Output
At Pin 6 the MCU does give me a sinus Wave with approx. 2V peak to peak. But after the Resistor next to the pin (where the trace is going)it gives me only the slightest hint of a signal (at 5mv per division) at the wrong frequency.

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11 years 9 months ago #941 by ganzziani
Replied by ganzziani on topic Re:Blown AWG Output
Probably the OPAMP is damaged.

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11 years 7 months ago #999 by david_sawatzke
Replied by david_sawatzke on topic Re:Blown AWG Output
Well, it turns out it was the 180k resistor at the xmega output that was blown (resistance too high for my meter). Replaced it with a new one and now it works fine. Don't know how that happened. Hopefully that helps someone.

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