Interpreting results from my scope

[iamseth]

I have a 555 setup in monostable mode.

I probed the output (pin 3) and the capacitor (pins 6 &7) to channels 1 and 2 respectively. The waveform looks like the one in the datasheet except I get some noise after the capacitor is charged up. I've attached the scope output image.

My values for R1 and C1 are 1M and .1uF.

Is this a concerning result and if so, what should I change to fix the issue?

[StillTrying]

It looks like the triggering pulse on pin2 is longer than the monostable time, and it needs 100n across its supply pins.

I think the GND is rising when the DIS pin starts to discharge the cap.

[vk6zgo]

I have a 555 setup in monostable mode.

I probed the output (pin 3) and the capacitor (pins 6 &7) to channels 1 and 2 respectively. The waveform looks like the one in the datasheet except I get some noise after the capacitor is charged up. I've attached the scope output image. (Attachment Link)

My values for R1 and C1 are 1M and .1uF.

Is this a concerning result and if so, what should I change to fix the issue?

It is not unusual to get a bit of "overshoot" or "undershoot" with fairly sharp transitions in "real life".
If you reduce the time/div & just look at the transitions, you will probably find they are sinusoidal.
Because you are using a fairly long time/div setting, the 'scope makes a sort of "best guess"of the waveshape, hence the "squarish" look .

On reflection, they are also low amplitude, so accurate representation of them will also be limited by the resolution of your ADC, so you will probably need to reduce the volts/div control as well.