#1116

[@raymonddompfrank1789]

I'm not quite sure, because you didn't show it all but from what I could see you used 10kHz, 20kHz and 200kHz square waves while adjusting the LF compensation. You should use something around 1kHz. Higher frequency square waves don't have enough LF content to show the LF peaking and drooping you're adjusting for, resulting in the variation of the square wave amplitude when trying to adjust LF compensation. The "peaking" you saw was just the extreme that could be reached with the trim capacitor.

[@toddanonymous5295]

When it starts working flaky, check the crimped ground connections on the connector. The one I had must have bypassed the QC inspector . After the repair it seems to work ok. They save a lot of wear and tear on my Tek probes.

[@gammaleader96]

They are also pretty useful for high impedance circuits since it limits the influence of the probe, because they add very low capacitance. You need to make sure that you have enough voltage there that you are able to see anything after the x100 attenuation though.

[@paulcohen1555]

Sure! There are no free meals!

[@clytle374]

Since you did not mention it and someone else mentioned blowing up a channel in their scope. If you have a 100:1 passive probe like this, you have a 100m ohm resistor in the probe and a 1m ohm input impedance in the scope. So if you probe a 1000V circuit the voltage drops to 10V at the scope input. But in my understanding that is only true when the scope is in DC coupling. If you set it to ac there is a capacitor in series with the input and any DC bias in the circuit you are measuring ends up directly across the capacitor in the front of the scope. I have a mso5000 too and haven't used it much at HV. But I have wondered why there isn't a resistor in the BNC end to create a full external voltage divider. It's on my long list of things I need to understand, but I'll grab the Tektronix 422 or 547 when I get scared for now

[@allthegearnoidea6752]

I think I bought the same probe. The probe I have work ok but I’m dubious about the actual voltage rating.

[@craigs5212]

Probe sounds interesting. How good is grabber end, say compared to a Tektronix? I purchased a Rigol DS4024 a few years back, like the scope except for the probe grabber tips. They have almost no spring holding power, easily slip off and don't seem to make very good contact. As I found out, never solder on the wire you clip to, the probe tip will melt. Rigol doesn't sell them as replacement items but did get them to replace a couple of bad ones.

[@jj74qformerlyjailbreak3]

I really need a “Digital” scope. My analog Dumont 2100g Scope doesn’t cut the mustard anymore, and channel 2 Is dead as all get out. It’s got me by for a first scope but... it’s hurting bad. I’ve recently taking up praying to the scope Gods for closure. Thanks for your knowledge and sharing it.

[@ziadfawzi]

Thank you for sharing this info.

[@paulcohen1555]

What is the rise time of the probe? Will you make a teardown to see the type of cable used? (Also for a cheap 10:1 probe).

[@gammaleader96]

I have seen several of the suepr cheap chinese probes using a single quarter watt through hole resistor inside. Pretty bad, both for HV safety and frequency response. Another interesting point would be the max. voltage vs. frequency plot. Most cheap 100:1 probes can only handle the high voltages up to a few kHz.

[@jimhatch14]

My Sencore scope and probe i can look at the cap of a horizontal output tube and measure the 1500v pulse.

[@catalinalb1722]

Hello, I just got my Siglent SDS 1104 x-E. I do have some quality x100 probes. I know that Dave from EEVBlog sells a device with which he can measure the 230v. What is the difference between using his device and using this x100 probe for live 230v? Don't worry I won't just stick the probe into the live socket. 🙃

[@IMSAIGuy]

I'm not familiar with Dave's device

[@catalinalb1722]

@@IMSAIGuy Hello, actually is called HV Differential Probe. Dave... EEV Blog... Thank you

[@IMSAIGuy]

@@catalinalb1722 Oh, ok. lots of folks sell those. they allow you to isolate the measurement since the scope ground lead will get you in big trouble if you connect it to the line voltages. So, probe tip is ok for line but not ground lead. I have a battery powered scope that allows me to connect things without ground problems.

[@catalinalb1722]

@@IMSAIGuy oh, yes, it makes sense now. Thank you very much for your explanation 🙂👍

[@frankowalker4662]

The adjusters on my probes are on the probes themselves, does this make a difference ?

[@IMSAIGuy]

no, they come both ways

[@frankowalker4662]

@@IMSAIGuy O.K. When I saw your answer, I could'nt remember what I asked. It was a puzzling message to recieve. LOL. Ooh err.

[@mbak7801]

There is a use for a 100:1 probe but I would be very wary of using this one on anything like a high voltage.

[@dell177]

a clip leadI remember Tektronix used to get an arm and a leg for their 100:1 probes and as I recall they were good up to 1,500v. I used to use theit p6015 probe that was 1000:1 and good for 30,000v when i worked on HV supplies. The 6015 was huge so it wasn't the kind of probe to could walk through circuits with.

[@paulcohen1555]

I remember a huge HV probe. It was filled with some special gas, right?

[@dell177]

@@paulcohen1555 Each probe came with a small can of freon, you were supposed to keep the fluid at the end of the probe covered to maintain it's HV rating. That said i don't think I ever had to top that fluid off in the decade plus we had that probe.

[@jjoonathan7178]

One of these cheap 100:1 probes with a flaky connection killed a channel on my first scope. I was probing around, it wasn't showing up, I heard some arcing in the connector... and the channel was dead. I was able to repair it but still, buyer beware.

[@IMSAIGuy]

Hmm... maybe I won't use it

[@paulcohen1555]

It will be a good idea to add a Transient Voltage Suppressor TVS between the probe and and scope. Seems not very difficult if you use a female-female for lowest added capacitance.

[@galileo_rs]

I doubt that this thing has 100MHz BW. Test it?

[@IMSAIGuy]

I will do a video, it does 75mhz great and is usable to 100mhz but reads a bit high