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Siglent LPA10 Active Probe Adapter

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KungFuJosh:
Hopefully they add that support with a firmware update.

alm:
Thanks for testing this!


--- Quote from: Martin72 on May 23, 2024, 05:19:22 pm ---I have tested an old and a new current clamp with negative results, so it can be assumed that no current clamps are recognized at all.

--- End quote ---
The datasheet shows one current probe (CP030), so I'd hope that probe would at least work with some of their scopes?


--- Quote from: Martin72 on May 23, 2024, 05:19:22 pm ---I took a closer look at the adapter itself, as I suspected it is a completely mechanical solution (pin3 and pin6 swapped, which is correct), so that can't be the problem, it's just what was stored in the Scope software.
Obviously no current clamps...
Will this be changed? I have my doubts.
Well, now we know exactly and so the effort was worth it.
I am glad that Siglent gave me the chance to try it out first instead of buying it.
I will still report to Siglent, if anything comes up I will post it in the thread.

--- End quote ---
Is there any way to override / ignore this dialog? On older Lecroy scopes, my experience has been that newer probes are not supported, but will still mostly work (except not being able to control any of the functions like zeroing from the scope). The scopes will allow you to adjust the units (V or A) and attenuation setting for the channel. The bus is just power + I2C, basically. For the older probes, as long as they get power, they should work. Newer ones might be stuck on a single attenuation / offset setting if the scope doesn't know how to adjust this. Maybe it would help if you could isolate the I2C pins? Lecroy actually sold a power supply for some of their probes that I'm sure doesn't do any I2C communication. It's not rated for current probes. My guess is that it's because it can't supply the relatively high current such probes demand.

FlexibleMammoth:

--- Quote from: alm on May 04, 2024, 09:56:12 am ---I would indeed verify compatibility rather than assume. For the TPA10 TekProbe adapter Siglent seems to have messed up the offset feature to the point where it's only usable with a few Tektronix probes that have their own offset control, and partly usable (no control over the vertical position) with Tektronix probes that ignore the offset signal. I have not seen an update that this was fixed.

Lecroy's probe interface is purely digital except for the scaling resistor in passive probes, as far as I understand. But there are a number of features, like controlling nulling, offset and attenuation from the scope, that came later in the life of their probe interface. Earlier probes like AP033 would have buttons on the probe / compensation box, which have been mostly moved to being controlled from the scope in later probes. So I'll be curious of the Siglent adapter supports those features. It might be that such functionality only works for supported probes since I believe Lecroy generally releases software updates to support newer probes.

The other thing is that DC current probes may draw a fair amount of current, since the way they work by sending a reverse current (multiplied by the transformer ratio) through the Hall effect sensor to null the magnetic field. Tektronix had problems with this on some of their scopes. I wonder if that's a reason for the short compatibility list. A test would be to connect a current probe measuring its max DC or LF current, and then see if this introduces ripple on the power rail that affects other probes powered by other channels (of course this also depends on their NMRR).

--- End quote ---

'Twas me - no it is not fixed. I have now had 4 TPA10, one of which that was exchanged 2 times, and tried 4 P6245 that should support offset and 2 P6247 that should do so aswell.
It does not work.
HQ cannot reproduce that, so maybe it is my fault. But the probes work on my 1103 so /shrug

Also I have and opened the LPA10 Adapter. It is purely mechanical.

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