Electronics > Beginners

Digital Oscilloscope Maximum Input Voltage

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tggzzz:

--- Quote from: glarsson on January 22, 2018, 12:04:46 pm ---
--- Quote from: tggzzz on January 22, 2018, 11:50:28 am ---Fortunately that is easy to avoid.

--- End quote ---
Have not found any *1 probes for sale!

--- End quote ---

Oh Good Grief.

https://www.digikey.se/products/en/test-and-measurement/test-leads-oscilloscope-probes/629?k=oscilloscope+probe&k=&pkeyword=oscilloscope+probe&pv331=270&FV=ffe00275&mnonly=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

That wasn't too difficult.

GBowes:

--- Quote from: Hero999 on January 22, 2018, 12:18:14 pm ---
--- Quote from: mike_mike on January 22, 2018, 11:13:22 am ---I read a part of the manual and I searched in the manual for some key words, but there is not mentioned the maximum voltage for the 2mV/div input.
--- End quote ---
Yes there is. It's in the screen shot you previously linked to and I explained it above. I repeat the maximum voltage rating is +/-0.4V on settings equal or below 50mV/div. Use a x10 probe if you want to use it on your 30V supply.

--- End quote ---

Sorry, but I must suggest that this is not correct.
The Maximum input voltage to the BNC connectors on this scope is the 300V referenced previously.

Tautech had it correct about Offset Range yesterday so I am not sure how the question came back up.

The "Offset Range" has nothing to do with safe Maximum Voltage Inputs. It simply specifies how far the zero voltage reference point may be moved to try to get the trace on the screen.
The "bandwidth limit" is just the next line in a long list of specifications and has no bearing on the input voltage. In this case it is saying that this scope has a 20MHz Bandwidth Limit switch. When enabled, this will attenuate higher frequencies in the input signal.

The fact remains that some of the voltages in question can be dangerous and should be avoided until one has a complete understanding and familiarity with the operation and application of any measurement instruments.

Graham


--- Quote from: Hero999 on January 21, 2018, 10:09:34 pm ---
--- Quote from: mike_mike on January 21, 2018, 06:17:12 pm ---Thanks for the reply.
What means "offset range bandwidth limit" ?
I found it in the manual and I took a screenshot:
--- End quote ---

The offset range bandwidth limit is the maximum voltage that can be applied at the input throught the 1x probe ?

--- End quote ---

I've not seen that before and I'm not certain. It looks like a maximum of +/-0.4V on settings equal or below 50mV/div, max +/-4V on settings between 100mV(10mV is probably an error) and 500mV/div, max of +/-40V, on settings from 1V/div to 5V/div and +/-300V on 10V/div.

--- End quote ---

Zero999:

--- Quote from: GBowes on January 22, 2018, 01:23:44 pm ---
--- Quote from: Hero999 on January 22, 2018, 12:18:14 pm ---
--- Quote from: mike_mike on January 22, 2018, 11:13:22 am ---I read a part of the manual and I searched in the manual for some key words, but there is not mentioned the maximum voltage for the 2mV/div input.
--- End quote ---
Yes there is. It's in the screen shot you previously linked to and I explained it above. I repeat the maximum voltage rating is +/-0.4V on settings equal or below 50mV/div. Use a x10 probe if you want to use it on your 30V supply.

--- End quote ---

Sorry, but I must suggest that this is not correct.
The Maximum input voltage to the BNC connectors on this scope is the 300V referenced previously.

Tautech had it correct about Offset Range yesterday so I am not sure how the question came back up.

The "Offset Range" has nothing to do with safe Maximum Voltage Inputs. It simply specifies how far the zero voltage reference point may be moved to try to get the trace on the screen.
The "bandwidth limit" is just the next line in a long list of specifications and has no bearing on the input voltage. In this case it is saying that this scope has a 20MHz Bandwidth Limit switch. When enabled, this will attenuate higher frequencies in the input signal.

The fact remains that some of the voltages in question can be dangerous and should be avoided until one has a complete understanding and familiarity with the operation and application of any measurement instruments.

Graham


--- Quote from: Hero999 on January 21, 2018, 10:09:34 pm ---
--- Quote from: mike_mike on January 21, 2018, 06:17:12 pm ---Thanks for the reply.
What means "offset range bandwidth limit" ?
I found it in the manual and I took a screenshot:
--- End quote ---

The offset range bandwidth limit is the maximum voltage that can be applied at the input throught the 1x probe ?

--- End quote ---

I've not seen that before and I'm not certain. It looks like a maximum of +/-0.4V on settings equal or below 50mV/div, max +/-4V on settings between 100mV(10mV is probably an error) and 500mV/div, max of +/-40V, on settings from 1V/div to 5V/div and +/-300V on 10V/div.

--- End quote ---

--- End quote ---
Thank you for your answer. To be honest, I wasn't sure about it when I posted it. I made more of a big deal about it, because I wanted someone to either confirm or correct it.

Yes, that makes much more sense. An instrument rated to 300V peak, is rated to that voltage on all settings.

mike_mike:
Thanks for the replies.
I noticed a thing that I cannot explain: while the probe and the oscilloscope is set on 1x the noise from one power supply is about 5-6mV pp, while the probe and the oscilloscope is set on 10x, the noise from the same power supply (a LM317 power supply with PNP pass transistor) is about 50-60mV (see the images below, the first image with 1x probe and scope and the second with 10x probe and scope). Is that normal ?

zvonex66x:
Yes, it's normal but you have changr probe from 1x to 10x but you didn't change probe in your oscilloscope settings

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