Can't think through the math and know I'm right.

Not sure how to do the conversion.
I'm using an amp clamp to gauge the amp draw on a starter. Can anyone explain both of the settings on my clamp as to what they would be per volt. Pictures below included.

1mV conversion to volts = 1mV x 1000= 1000mV or 1 volt

For the 10mA scale: 10mA x 1000= 10.000mA or 10 A
For the 100mA scale 100mA x1000= 100.000mA or 100A

1mV/10mA = 1V/10A
1mV/100mA= 1V/100A (your clamp has a max input of 60amps)

1 mV/10 mA (100 mV = 1 A)
—> use this for testing currents up to 20 A.
1 mV/100 mA (10 mV = 1 A)
—> use this for testing current up to 60 A.

Make sense?

So you'll need to use a high amp clamp to measure starter current...

Dylan has the math right for that clamp. It looks like the peak current seen during the start of your capture is about 2V, with translates to around 200A. The clamp is rated to 60A, but I've found most low amp probes are actually capable of measuring much higher. I use that same style of clamp for relative compression stuff all the time.

For comparison, here's a waveform I took off a 2.4L Honda with a failing starter. Yellow is battery voltage, green is starter current.

Tyler wrote:

I use that same style of clamp for relative compression stuff all the time

Oh yeah definitely! Me too. I also tried to AC Couple cause I saw the guy from realfixesrealfast doing this

I just un-stickied (is that a word?) the amp clamp voltage conversion charts that Andy posted too...

Here are some videos you might wanna take a look at.
Feel free to ask any question you have.

Wow I hope this dose not post twice but her it is again. I have that same Amp Clamp and a Snap On Verus. I found out that if you set the scope to the 20 amp scale that that amp clamp reads right on the 10ma setting. I compeared it to my bosses Snap on amp clamp at the 20 amp setting it is the same.

I use an Innova 3347.
When set on 10mv/1A, it is accurate on the Verus low amps 60 setting.

I like to write stuff like that right on the tool, my Verus has similar notes on it...

What is the maximum amperage you guys can read with the low amp probe? Just wondering.... We can see a 2V=200A in the first post here.

Well, just thinking out loud here, but you could theorize that the maximum amperage displayed would be determined by the voltage available to the "magic box" in the amp clamp.
We know the source voltage is 9v, it's probably stepped down to a slightly lower voltage so as to not so severely impact measurements as battery life decays. So if the "magic box" was fed a regulated 6v, close to 6v would probably be the clamps maximum output.
So, 600ish amps??

Again, that's all just B.S.
I can try it on my Caterpillar

Well I found an older post here in this section.

scannerdanner.com/forum/diagnostic-tools...amp-max-current.html

Seems that the Snap on low amp flatlines around 250A

Dylan wrote: Well I found an older post here in this section.

scannerdanner.com/forum/diagnostic-tools...amp-max-current.html

Seems that the Snap on low amp flatlines around 250A

Yeah, that's all I could get out of my Innova on the starter of the Cat front end loader. So much for my hypothesis!
I do want to put it on a wire and directly short that wire across a battery. That should max her out...

Noah wrote: I do want to put it on a wire and directly short that wire across a battery. That should max her out...

:lol: Be sure to bring the makings for smores, 'cause it's gonna get toasty!

Noah wrote:

Yeah, that's all I could get out of my Innova on the starter of the Cat front end loader. So much for my hypothesis!
I do want to put it on a wire and directly short that wire across a battery. That should max her out...

Guys, just use a high amp clamp for measuring starter current :lol:

Dylan wrote: Guys, just use a high amp clamp for measuring starter current :lol:

Nooooooooooo, that'd be to easy! We have a compulsion to misuse our tools. :lol: