| Electronics > Beginners |
| Maximum Scope Voltage |
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| tooki:
--- Quote from: Ian.M on October 09, 2018, 03:01:56 pm ---I wouldn't trust a switchable probe for that - one moment's inattention or a buildup of conductive dust in the switch and its bye-bye expensive new toy. --- End quote --- --- Quote from: tggzzz on October 09, 2018, 03:13:44 pm ---Sooner or later a *1/*10 probe will be in the *1 position. --- End quote --- Honest question: why do we even use switchable probes? In what situations is a x1 probe preferable to a x10? It seems to me that the x1 position is used so spectacularly rarely — and is a clear source of unreliability and/or user error — that I wonder why we don’t just use fixed x10 probes, and let the few who need x1 buy them separately (it’s not as though they cost much!). |
| Paul Moir:
For Me: --- Quote from: tooki on October 09, 2018, 05:53:32 pm ---Honest question: why do we even use switchable probes? --- End quote --- They came free. I would never buy one. --- Quote from: tooki on October 09, 2018, 05:53:32 pm ---In what situations is a x1 probe preferable to a x10? --- End quote --- For low impedance, low voltage sources running at low frequencies. By low voltage I mean too low to resolve well with a x10 probe. --- Quote from: tooki on October 09, 2018, 05:53:32 pm ---and is a clear source of unreliability and/or user error. --- End quote --- Put them in 10x mode and tape over the switch. Tape it over in such a way you can verify the switch is in x10 mode. Use Kapton tape for the pro look. ;) |
| David Hess:
--- Quote from: tooki on October 09, 2018, 05:53:32 pm ---Honest question: why do we even use switchable probes? In what situations is a x1 probe preferable to a x10? It seems to me that the x1 position is used so spectacularly rarely — and is a clear source of unreliability and/or user error — that I wonder why we don’t just use fixed x10 probes, and let the few who need x1 buy them separately (it’s not as though they cost much!). --- End quote --- X1 probes are suitable where maximum sensitivity is required at the expense of bandwidth and loading. AC coupled noise measurements of power supplies are a good example. |
| tggzzz:
--- Quote from: tooki on October 09, 2018, 05:53:32 pm --- --- Quote from: Ian.M on October 09, 2018, 03:01:56 pm ---I wouldn't trust a switchable probe for that - one moment's inattention or a buildup of conductive dust in the switch and its bye-bye expensive new toy. --- End quote --- --- Quote from: tggzzz on October 09, 2018, 03:13:44 pm ---Sooner or later a *1/*10 probe will be in the *1 position. --- End quote --- Honest question: why do we even use switchable probes? In what situations is a x1 probe preferable to a x10? It seems to me that the x1 position is used so spectacularly rarely — and is a clear source of unreliability and/or user error — that I wonder why we don’t just use fixed x10 probes, and let the few who need x1 buy them separately (it’s not as though they cost much!). --- End quote --- The only unique use case for *1 probes is low voltages where the extra input capacitance and lower frequency response is tolerable. So-called "high impedance *10 probes" aren't high impedance. Work out the impedance of their 15pF capacitance at 1, 10 and 100MHz :) Hint: at 100MHz the "low impedance resistive divider probes" have a higher input impedance. |
| DigitalAura:
I already have a HV diff probe, and always use that in situations where it is required. As this situation is slightly different I figured I'd ask just to be on the safe side. |
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