DB Electrical

[posplayr]

Ohman, reading this makes me worry a bit if these SH775 I ordered - under a polaris parts number though - really are non-shunt
Ordered these https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 from "Leaders RPM"

Anybody have a quick how-to to see if they're shunting? I do have a a few multimeters available (and a scope, and a benchtop DC power supply)

You need a clamp on AC current meter. More DC load makes the stator current drop. Less load makes it go up. That is SHUNT. SERIES is opposite.

[roeme]

Thanks, posplayr. (Should've been obvious) Now I have an excuse to order one these. Have to read up on them first though, last time I looked at those there was talk of True RMS meters being quite pricey.

[posplayr]

Thanks, posplayr. (Should've been obvious) Now I have an excuse to order one these. Have to read up on them first though, last time I looked at those there was talk of True RMS meters being quite pricey.

Clamp on meters are much cheaper; no need for a TRUE RMS meter but now a days with 32 bit ARM chips that is a cake walk (i.e. no problem).

This is an example. People have posted reviews on other from Radio Shack (I believe) here if you search.

http://www.ebay.com/itm/Mastech-MS2002-Auto-Ranging-Digital-Clamp-on-Meter-200A-AC-Current-Tekpower-/302029021964?hash=item465255230c:g:lJUAAOSwRoxXnkHS

Honestly just buy a used SH-775 (ebay) and skip all of the instrumentation. They are cheaper than teh meter.

[roeme]

Thanks for the link!

Ah, so the AC readings will be good enough for this application? I was worried because from what I remember most of cheapies give completely inaccurate readings wenn presented with a non 50/60Hz waveform. I'll be glad to be wrong.

Honestly just buy a used SH-775 (ebay) and skip all of the instrumentation. They are cheaper than teh meter.

Not true for me – just had a look. Because of shipping and low import taxes on electronic stuff, a lot of clamp-ons are cheaper for me to buy here in a local shop (EU, Switzerland).

I think the marginal price difference back then also made me buy the RRs new, not used.

Sorry to have de-railed the thread a bit.

[posplayr]

Thanks for the link!

Ah, so the AC readings will be good enough for this application? I was worried because from what I remember most of cheapies give completely inaccurate readings wenn presented with a non 50/60Hz waveform. I'll be glad to be wrong.



Not true for me – just had a look. Because of shipping and low import taxes on electronic stuff, a lot of clamp-ons are cheaper for me to buy here in a local shop (EU, Switzerland).

I think the marginal price difference back then also made me buy the RRs new, not used.

Sorry to have de-railed the thread a bit.

Most of the meters are designed for 50/60Hz but still have sensitivity out at 500+ Hz. IIRC correctly 5k RPM would be 500 Hz (for 18 pole or whatever is on my GS1100E).