Products > Test Equipment
Passive probes and quality
spikey1973:
Hallo to all.
Some of you allready know that I have ordered a Aneng AOS03 / ZOYT ZT703s.
There has been a lot of discussion in the thread on these machines on the topic if this was a good choice, as there are always so many more and better options available.
So from here on let's just assume I am happy with the toy like quality of this scopemeter and go from here please!
Anyway the ZT703s is a 50Mhz scope with input impedance of 1M Ohm @ 16pF and it came delivered with (in my case 1) a ypioneer p2016 60Mhz type of probe (from aneng/zoyt/ypioneer?)
When I compensated the probe it worked fine initially, but when I zoomed in on the square wave and tried to move out and back in to do it more securely there was no response anymore.
I guess the variable capacitor is broken, the screw actually rotates but there is no response on the screen.
It is fairly close to compensation on channel 1, but not exactly there. but I might be able to get some usage out of it for now if I really need to.
Anyway I also have an Uni-T P03 probe too, later more on that.
So I am looking for a fairly descent probe set to use with this scope, so something within my small (AE) budget and a quality that would not be a waist for this scope.
In the mean time will see if AE will compensate (my friend) some for the probe.
When I asked about probes and quality in the thread of the zt70x I was pointed to thread by @IC_Toaster where he compares three probes on these scopes.
https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5690181/#msg5690181
Although very interesing, I still have many more questions on passive probes and there quality for which I thought to start this thread, so not to hijack other thread.
So IC_Toaster's conclusions were: (Fast till slow)
Without attenuation:
Zoyi >> Siglent >>> p6100 probe.
With attenuation:
Siglent >> Zoyi >>> p6100 probe.
The specs (I found, some assumptions are made here)
Zoyi: 60Mhz, 10MOhm @ 10x, 14pF-70pF, compensation 10pF-35pF (if the ypioneer p2060 like mine)
Siglent: no type or specifics known to me.
p6100: 100Mhz, 10MOhm @ 10x, 18,5pF-22,5pF, compensation 10pF-30pF (general p6100 AE specs)
Besides these I myself have a (Uni-T)
UTP03: 60Mhz, 10MOhm @ 10x, 14.5pF-17.5pF, compensation 5pF-30pF
I really looked forward comparing this with the probe that came with my scope as a fun test to do, knowing it would be done with my toy scope. it could've still give me some information.
So my questions can all be basically combined into one, what makes one probe better / faster then the other.
- Ofcourse the bnc connector quality and the quality of the wiring, but what else?
- I assume a smaller range of variable capacitance would make a more accurate compansation possible?
- So what 'causes' the faster / slower response time?
- Is the there a relation between Max frequency and it's relation to the Max frequence of the scope? (would a 60Mhz probe fit better with a 50Mhz compared to for example a 100Mhz probe?)
- What else are essential qualities in a good passive probe.
Kind greats
Matthieu
Addition: what is the difference between the p2000 / 4000 / 6000 / 7000 series probes?
JacobPilsen:
In short: Always take the better probe if you can.
The probe attenuation is combined with the oscilloscope input attenuation.
When both have -3dB at 50MHz, they will have about -6dB together. And they will have -3dB somewhere lower, for example around 43MHz.
But a 100MHz probe with a 50MHz oscilloscope will have -3dB closer to 50MHz, for example 47MHz.
Some literature: https://w140.com/tekwiki/images/6/62/062-1146-00.pdf
(Tektronix Oscilloscope Probe Circuits Concepts by Joe Weber)
IC_Toaster:
@spikey1973
I did that comparation, but I don't have much knowledge so probably there are more test to do in order to determine the probe frequency response. In that case, I accept suggestions to do these test.
The Siglen probe is this: https://www.siglent.eu/product/1262729/siglent-pb470-70mhz-1x-10x-attenuation-oscilloscope-probe
And the specifications are: 70MHz 1X/10X attenuation, 85/18pf, 1M/10Mohm, 6M/70MHz, 300V/600V
Sorry Spikey, I will take advantage of this thread to ask for recommendations for a not expensive probe with at least 200 MHz bandwith for my Siglent oscilloscope (200 MHz is supposedly the oscilloscope bandwith).
Does this Owon probe worth it? https://www.aliexpress.com/item/1005006370069181.html
Aldo22:
--- Quote from: JacobPilsen on November 07, 2024, 07:35:01 pm ---In short: Always take the better probe if you can.
--- End quote ---
Yes, but there's no point in overdoing it.
The P6100 should be sufficient for your scope imo.
Your ZT703s has a rise time of 10ns.
The differences you see on the Siglent screenshots probably cannot be captured by your scope.
You can also read something here, for example:
https://www.physics.wisc.edu/courses/home/fall2022/321/lab_equipment/MSO2014_scope_tutorials/Probes/Probes-Instructors-Guide.pdf
KungFuJosh:
IMO, the best probes are from ProbeMaster.com, and many people like Testec too.
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