DC amp clamp needed !!

thermal runaway · 16th November 2009, 01:02 PM

Need to get an Amp clamp meter that reads DC upto over 300 amps ? Any recommendations please ?

AndrewT · 16th November 2009, 01:24 PM

a four terminal 0r01 would drop 3Vdc at that peak current.
If that is too much then look for a 0r001 four terminal resistor to allow current to voltage conversion. Far cheaper than any clamp meter.

thermal runaway · 01:31 PM

No good for my application , measuring car starting currents , big ICE amp currents , inverter battery currents , etc , etc. I actually have some big AVO shunts , but as I said , no good for in circuit measurements.

star882 · 16th November 2009, 01:48 PM

Make your own out of a flyback transformer core and a hall effect sensor.

poobah · 16th November 2009, 01:58 PM

Do need a split clamp? It makes a big difference costwise...

If not... then F.W. BELL / Sypriss makes these... with a nice price. You might have to build a small diff amp circuit to get the most useful readings.

Current Sensor

eyoung · 16th November 2009, 02:12 PM

Go to Fleabay and look for a used Sun Electric VAT24 or 40 automotive auto electrical starting and chargeing test equipment, or something similar from Bear . These are used in automotive battery, starter, and alternator testing there are probably some info online Sun Is now part of Snap On .

Good luck, Elwood

thermal runaway · 16th November 2009, 02:17 PM

Do need the split type for access reasons. Need to go for an off the shelf unit for convenience and ease of use.

poobah · 16th November 2009, 02:20 PM

What type of frequency response do you need?

thermal runaway · 16th November 2009, 04:21 PM

Just DC .

AndrewT · 16th November 2009, 04:22 PM

Quote:

Originally Posted by thermal runaway

Just DC .

I doubt it!

16th November 2009, 01:02 PM	#1
thermal runaway diyAudio Member Join Date: Mar 2007 Location: West Mids , UK	DC amp clamp needed !! Need to get an Amp clamp meter that reads DC upto over 300 amps ? Any recommendations please ?

16th November 2009, 01:24 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	a four terminal 0r01 would drop 3Vdc at that peak current. If that is too much then look for a 0r001 four terminal resistor to allow current to voltage conversion. Far cheaper than any clamp meter. __________________ regards Andrew T.

16th November 2009, 01:29 PM	#3
thermal runaway diyAudio Member Join Date: Mar 2007 Location: West Mids , UK	No good for my application , measuring car starting currents , big ICE amp currents , inverter battery currents , etc , etc. I actually have some big AVO shunts , but as I said , no good for in circuit measurements. Last edited by thermal runaway; 16th November 2009 at 01:31 PM.

16th November 2009, 01:48 PM	#4
star882 diyAudio Member Join Date: Mar 2007	Make your own out of a flyback transformer core and a hall effect sensor. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

16th November 2009, 01:58 PM	#5
poobah diyAudio Member Join Date: Nov 2005	a possible solution Do need a split clamp? It makes a big difference costwise... If not... then F.W. BELL / Sypriss makes these... with a nice price. You might have to build a small diff amp circuit to get the most useful readings. Current Sensor


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16th November 2009, 02:12 PM	#6
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	Go to Fleabay and look for a used Sun Electric VAT24 or 40 automotive auto electrical starting and chargeing test equipment, or something similar from Bear . These are used in automotive battery, starter, and alternator testing there are probably some info online Sun Is now part of Snap On . Good luck, Elwood __________________ "when you open your mind to the imposible, soon you will find the truth...."

16th November 2009, 02:17 PM	#7
thermal runaway diyAudio Member Join Date: Mar 2007 Location: West Mids , UK	Do need the split type for access reasons. Need to go for an off the shelf unit for convenience and ease of use.

16th November 2009, 02:20 PM	#8
poobah diyAudio Member Join Date: Nov 2005	What type of frequency response do you need?

16th November 2009, 04:21 PM	#9
thermal runaway diyAudio Member Join Date: Mar 2007 Location: West Mids , UK	Just DC .

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