Products > Test Equipment
1000 A current probe for spot welder measurement
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Martinn:
Hi all,
I purchased a CP01 spot welder https://www.aliexpress.com/item/1005005334325622.html which, somewhat unexpectedly, works surprisingly well (I did some quick tests on AA cells).
Of course I am wondering what current this unit provides, I have seen it advertised at "1000A", currently the Ali description says ">650A". As I don't own a current probe in this range (I have  a Tek A6302) I am looking for other options. As I am not going to specialize in spot welder development, there's no point investing in a high grade unit. I thought about poking needles through the cable insulation, doing a four-wire resistance measurement and use the cable then as shunt for a current measurement.
Checking Mouser parametric search for matching sensors comes up with this https://www.mouser.ch/ProductDetail/Tamura/L06P800S05?qs=DDWeUbTzG0fyBrNwDestkQ%3D%3D 800 A Tamura sensor, which looks perfect and is quite cheap at Fr. 20.
Any other suggestions?
nctnico:
Rogowski coil
Martinn:

--- Quote from: nctnico on August 30, 2023, 05:22:02 pm ---Rogowski coil

--- End quote ---
Aren't those AC only? Expected waveform is a 20 ms 500-1000A single (DC) pulse.
Stray Electron:
  I've seen people make current shunts from various sizes of steel drill rod.  IIRC there is a Youtube video of someone testing lithium jump starter battery using a drill rob current shunt. 

   Link: https://www.metalsupermarkets.com/what-is-drill-rod/

   Hmm. I looked and there are a few commercially-made 1000 Amp current shunts for sale on Ebay. 
nctnico:

--- Quote from: Martinn on August 30, 2023, 05:28:07 pm ---
--- Quote from: nctnico on August 30, 2023, 05:22:02 pm ---Rogowski coil

--- End quote ---
Aren't those AC only? Expected waveform is a 20 ms 500-1000A single (DC) pulse.

--- End quote ---
These work excellent for spot welding. Been there, done that (up to tens of kA).
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