Products > Test Equipment
Accurate Low Amp Current Probe Advice
KungFuJosh:
--- Quote from: jonpaul on November 12, 2024, 04:56:49 am ---Best amp is TEK AM503B.
Look at epay, ham fleas, auctions.
--- End quote ---
Thanks, I already got it. I got the A6302, TM502A, and AM503B. I also have a Toolbox 016-0362-00 on the way for the other slot to store the A6302 in.
jonpaul:
Kung, perfect, cant do better.
We degauss after warmup 30 min and before each use,
just be sure to term AM503B in 50 ohm on scope input.
To CAL we use TEK PG506, (or similar,) and wind a 10, 100T magnet wire square loop with a 50 Ohm term R on the loop in series with 50 Ohm on the gen.
Enjoy,
Jon
tautech:
Quick first look at the factory fresh SCP5030A 100 MHz 30A active current probe measuring the current loop output of the Power Analysis deskew fixture.
So easy to use as it's scope self sensing and results are quite satisfactory from a cold start.
Used HiRes mode to reduce trace noise......
_Wim_:
Another possibility. Not as good as the Tektronix system, but way more compact and good enough performance for what I need: a Lecroy CP015 (alternatives are CP030, AP015 and AP030)
I run this probe without a Probus interface, just with a +-12V power supply connected directly to the probe (and a BNC 90°-adaptor to connect it to the scope). There probes can be had for 300-500€ on Ebay, less if you are lucky. When power is turned on, the probe runs a degaussing cycle. So for I have not looked into trying to send I2C commands as these protocol is not well documented (and it works good enough without).
Test was run with the Yokogawa GS200 supplying a 30mA current (to mimic test conditions above). I did not log the current of the Yokogawa, but I am sure this is completely flat (max a couple of µA variation). Probe was connected to a BM869s and logged via testcontroller software. As the output of the probe is only 100mV/A, the signal was only 2.6mV. Temperature in the room was not tightly controlled, so some drift could be temperature related of the >4 hours this test has run.
_Wim_:
Here some more detail how this is connected to the scope. The damage to the sticker was how a bought it, and it also had already the cut-out where the 90°-BNC adaptor fits in. I did solder the power supply cable (and UTP cable, that fits directly to the Fluke I50 power supply I already had).
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