Products > Test Equipment

1000 A current probe for spot welder measurement

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tautech:

--- Quote from: Martinn on August 31, 2023, 05:32:31 pm ---
--- Quote from: srb1954 on August 30, 2023, 10:30:55 pm ---Since you have already got a Tek A6302 it might be worth considering looking for a Tek CT-5 current transformer to go with it giving the benefit of a wide frequency range (0.5Hz to 15MHz), high pulse handling capability (50kA) and the wide sensitivity range (5000:1) of the A6302.

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Didn't know that these exist! There is even one nearby (<1000 km) for quite a decent price.
However as my storage space is limited I am reluctant to buy stuff I probably need once in a decade. Also if I purchase some kA measurement equipment it should at least be able to measure my TIG welder current (not that it would need measuring...) and a non-DC transformer would not be ideal for that.
Anyway thanks for pointing out!

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Typically under 100A but DC.
Shunts would be the simplest however add some HF Start/Run and it's not so simple.

DaneLaw:
Tried with an inrush clamp meter and with two sub 50 bucks AC/DC current clamps for low amps for scope, to see what they could pick up on short current pulses with a spot welder.

Hantek CC-65 (20K) & ETCR007 (100k), and tried with a 1000A AC/DC clamp meter Habotest HT208D. with its inrush.... but I don't have the tools to validate if those inrush values are somewhat accurate, but HT208D was able to pick up very brief current pulse down to like 10ms.
How accurate inrush <DC values are on a sub 40buck 1000A clamp meter like below..  :-// it certainly aint a Fluke PQ345 as exampled above, very impressive clamp meter https://docs.rs-online.com/8278/0900766b8095f724.pdf
 

Overall pleasantly surprised about how it performed even at thicker or stacked nickel strips. for me it was critical that I could separate the batteries from the spot welder when dealing with bottom of the barrel from China, as 10 buck delivered is chancing it.
was using old 4S lipo cells from this old CP stingray clone.. https://tinyurl.com/36rpsd2r with a around 40C rating
4S is higher than its rated 12v but it's the first old rev. that seems to have better circuitry, not sure if later revisions will tolerate 16v.
With the price in mind, impressed, does the job very well for the few times I had a use for it, it got a display where you can toggle from 1 to 99ms (1to99E) & two welding modes "aut-time delayed or manual for fx foot pedal.
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ETCR07 & CC65

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55ms  HT208D

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20ms

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If these quite cheap 1000A current clamp meters like the HT208D, with inrush peak, are able to deliver somewhat accurate numbers in DC, then it would be pretty straightforward as a tool to measure current draw on fast pulses under 100ms.

Martinn:
Quick update: Got an 800 A sensor from Tamura (link in first post).
Welded a nickel strip onto some junk AA cell. Pulse is 416 A, 85 ms.
Works! Quick, easy, inexpensive, does its job.

mk_:

--- Quote from: Martinn on August 31, 2023, 05:32:31 pm ---
--- Quote from: srb1954 on August 30, 2023, 10:30:55 pm ---Since you have already got a Tek A6302 it might be worth considering looking for a Tek CT-5 current transformer to go with it giving the benefit of a wide frequency range (0.5Hz to 15MHz), high pulse handling capability (50kA) and the wide sensitivity range (5000:1) of the A6302.

--- End quote ---
Didn't know that these exist! There is even one nearby (<1000 km) for quite a decent price.
at.

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Thanks, this one from nearby is on its way to my lab... going to measure slow hv-pulses (with high current) the CT-4 isn`t able to handle anymore.

TizianoHV:
Would be interesting a small review / test of this current transformer. Seems good for the price.
What's the smallest current it can measure?...

Thankyou!

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