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View Full Version : Raed pwm amps Acuretly



u4david
10-07-2008, 09:10 AM
When using PWM:How do you monitor the current draw if standard automotive gauge wil not be capable to echo Correctly pulsed amps?

HHO King
10-11-2008, 10:33 PM
You need a setup like this if you are going to monitor amperage.

http://www.extremehho.com

donnylynn
10-11-2008, 10:40 PM
The meter as shown in the link above will measure average current just like an automotive guage.

Mindcrime13
10-11-2008, 11:59 PM
an amp meter connected to the positive wire should work

Alt-Fuel-Sys
12-20-2008, 01:36 PM
If you want to measure peak current, You'll need an oscilloscope connected to a meter shunt installed in the high current path. Find the peak voltage on the o-scope and devide it by the resistance value of the meter shunt. That will give you peak current.

You can also short around the pwm momentairly, and measure with a standard ammeter. This reading will be slightly high because it doesn't take into account the resistance of the pwm, but it should be close.