Um, measuring voltage across a thermistor to determine current through it does not seem very productive.? By its very nature the resistance will be changing with the current!? I would go with the current transformer, as others have recommended.?Jim FordSent from my T-Mobile 4G LTE Device
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-------- Original message --------From: "Charles via groups.io" <charlesmorris800@...> Date: 3/29/22 6:49 AM (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] Measuring inrush current I'm getting lost... which CT are you referring to?I measured the AC inrush current directly across the 2 ohm thermistor, using the scope. That was more for academic interest since it doesn't pop the breaker or make ugly transformer noises.I have not yet tried the Ultrastab CT to measure the current into the bridge or to the cap, but as noted it will work great for that as long as it's less than 700 amps. If it runs out of range the flat-top should be obvious.So I'll be able to use my 564 on single-sweep to get a longer look at the pulse and decay time :)
