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Oscilloscope probe voltage derating @ high frequency
G-son:
In the documentation with oscilloscope probes we get a derating curve, but when do we really have to care about it? Does it apply only to a constant voltage & frequency sine wave, or do we have to handle
occasional pulses the same way? In other words, do we have to follow the same voltage limit for one single 1µs sine wave per second with zero volts the rest of the time as we have to with a constant 1MHz sine wave signal? (Obviously assuming 1MHz is well above the frequency where that hypothetical probes derating curve starts going down.)
mag_therm:
It was my fault when I destroyed a pair of the generic P6100 200MHz probes.
I did not check to see the P6100 derating curve is about 4 times lower
at 14MHz, than the (standard for scope) Instek GTP-200B-4 200 MHz which are rated from the curve: 100 [Vdc+Vpk] @ 14MHz
As there are no thermal time curves, I would answer you question in the conservative, meaning to stay below the curve even for intermittent pulse.
I since spent a bit more on a pair of Keysight N2140A 200 MHz.
The quick start guide does not have a curve, just "10:1 - 300V rms CAT II"
G-son:
That is no doubt the safest option. We'll see how safe I can stand being... :box:
mag_therm:
Better option: 30dB long tail Tee, homebrew needing lathe/milldrill and a fair amount of spare time.
https://app.box.com/s/gnnkla2v5gktpgkzgul0dwypl0cfzh8h
2N3055:
--- Quote from: mag_therm on May 25, 2024, 01:12:13 pm ---It was my fault when I destroyed a pair of the generic P6100 200MHz probes.
I did not check to see the P6100 derating curve is about 4 times lower
at 14MHz, than the (standard for scope) Instek GTP-200B-4 200 MHz which are rated from the curve: 100 [Vdc+Vpk] @ 14MHz
As there are no thermal time curves, I would answer you question in the conservative, meaning to stay below the curve even for intermittent pulse.
I since spent a bit more on a pair of Keysight N2140A 200 MHz.
The quick start guide does not have a curve, just "10:1 - 300V rms CAT II"
--- End quote ---
Are you saying that you believe there is no derating needed because there is no curve?
Do you realize Keysight considers those "low cost" probes, and those are delivered with 1000X series?
It would not be surprising if they had derating curve similar to cheap Hanteks..
Or do you have some official specifications to base your opinion on?
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