Hi everyone, I just bought a Tektronix TDS3024 scope and could use some help knocking out some unwanted behaviors on the scope readings.
First off, all the channels on the scope seem to have a -40mV offset when I first turn it on. This is with no probes plugged in yet and the 'offset' option for each channel zeroed out.
I can get rid of the offset by connecting a probe to each channel and attaching the probe to the 5V square wave calibration output on the scope. But this gets annoying after a while and doesn't solve the problem permanently as the offset comes back the next time I power up.
Also, it seems like there's some capacitance affecting the 5V square wave output when I attach a probe to it. On each rising and falling edge, there's a bit of overshoot and a parabolic decay to steady-state. (There's an attached picture of this.) There's no ringing, just overshoot and what looks like a capacitance discharging at each edge.
Any help would be greatly appreciated. I can't wait to get this scope running smoothly so I can use it on my projects.
First off, all the channels on the scope seem to have a -40mV offset when I first turn it on. This is with no probes plugged in yet and the 'offset' option for each channel zeroed out.
I can get rid of the offset by connecting a probe to each channel and attaching the probe to the 5V square wave calibration output on the scope. But this gets annoying after a while and doesn't solve the problem permanently as the offset comes back the next time I power up.
Also, it seems like there's some capacitance affecting the 5V square wave output when I attach a probe to it. On each rising and falling edge, there's a bit of overshoot and a parabolic decay to steady-state. (There's an attached picture of this.) There's no ringing, just overshoot and what looks like a capacitance discharging at each edge.
Any help would be greatly appreciated. I can't wait to get this scope running smoothly so I can use it on my projects.
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