Electronics > Beginners
Digital Oscilloscope Maximum Input Voltage
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tautech:

--- Quote from: mike_mike on January 22, 2018, 07:07:04 pm ---I tried to measure a 9V battery.
The oscilloscope measured 1.2mVpp the noise of the battery on 1x (the probe and the scope were set on 1x) and 12mVpp the noise of the same 9V battery on 10x (the probe and the scope were set on 10x).

--- End quote ---
In AC coupling all you are seeing is internal scope noise, there is NO noise on pure DC.
mike_mike:
Thanks for the reply.
So I think my scope is not working correctly ? because it shows 50mVpp in 10x mode while in 1x mode it shows 5mVpp ?
tautech:

--- Quote from: mike_mike on January 22, 2018, 07:17:51 pm ---Thanks for the reply.
So I think my scope is not working correctly ? because it shows 50mVpp in 10x mode while in 1x mode it shows 5mVpp ?

--- End quote ---
Unless it was in front of me and I was driving it, I couldn't/wouldn't say.
Spend some time here watching Alan's vids:
https://www.eevblog.com/forum/beginners/oscilloscope-training-class-(long)/

Are you using the probe ground lead ?
nrxnrx:
Switch the scope channel to DC coupling and measure the 9V battery.
Set the scope to expect a 10x probe. Measure the battery when the switch on the probe is set to 1:1 and 10:1 (do not change the scope settings during this). What voltage does the scope see?

If the displayed voltage doesn't change when you flip the switch on the probe, the fault lies with the probe.
If so, and it shows 9V, then your probes are stuck in 10:1 mode. If it shows 90V, they're stuck in 1:1 .
mike_mike:

--- Quote from: tautech on January 22, 2018, 07:23:32 pm ---Are you using the probe ground lead ?

--- End quote ---
Yes.

If I set the coupling to DC, the scope setting to 1X the vertical voltage to 5V, if I use the probe with 1X the voltage goes to nearly 10V and when I use the probe with 10X the voltage goes just a little bit above the initial position of the trace.
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