When testing my new PC oscilloscope, a PicoScope 2205A (25MHz, 1GS/s), I setup an RC circuit with a 2.2K resistor and a 0.1uF cap and used the AWG generator to input a 1kHz, 1V square wave input. The input square wave (plotted in red) is not the expected square wave, seemingly affected by the capacitor (as the input went flat after moving it and measuring a voltage divider).
Any idea on why my input waveform is distorted by the load circuitry?
Further info
* I measured the rise time of the square wave without any load circuity at 1.2us. The time constant of this circuit is 220us.
* I also used the 10x attenuator probes, and tuned the variable capacitor in the probes beforehand.
Screenshot:
Input voltage in red, capacitor voltage in blue
Any idea on why my input waveform is distorted by the load circuitry?
Further info
* I measured the rise time of the square wave without any load circuity at 1.2us. The time constant of this circuit is 220us.
* I also used the 10x attenuator probes, and tuned the variable capacitor in the probes beforehand.
Screenshot:
Input voltage in red, capacitor voltage in blue