yes, the dutycycle is a factory tool (a current meter of some kind , a suzuki secret)
but any scope does this easy, (child's play really seeing the wave form there) turn throttle stop till it goes 50% (half high , half low; done)
with DMM they are not all the same, vast designs of DMM inside, make things harder. ( i always try)
using the DC scale.
some show 7volts at 50% real well.
what is key is this.
the faster DMM work best, (not long slow 1second sample rates) it need to be 2 times or more faster than 0.005 seconds, say .002 seconds for faster samples....we need to digitize the ups and downs.... see?
some DMM have filter that blocks AC signals, (fails) some are just blind to A.C signals on DC range. (Filters inside, etc)
others report peak DC only.
others report the average of DC samples. (bingo)
when the average of 14.7v is at 50 % it reads 1/2 that.
but all this is tedium,, just connect up and see if it works. if you see like 6v, and you turn the bleed (91+) or on early kicks turn the throttle stop and can get 7v , all is good.
it it shows 0v or 12v or 14v all the time, try another dmm. or is not responsive to idle air changes.
when done and at 50% the engine will never lose control of idle ever.
in park or drive, or all accessories ON, or all things loading engine or none.
it helps to have 4 hands,
2 for needles
and 2 more to fiddle DMM ...
my bud calls this jiggery pokery.... funny that..
but any scope does this easy, (child's play really seeing the wave form there) turn throttle stop till it goes 50% (half high , half low; done)
with DMM they are not all the same, vast designs of DMM inside, make things harder. ( i always try)
using the DC scale.
some show 7volts at 50% real well.
what is key is this.
the faster DMM work best, (not long slow 1second sample rates) it need to be 2 times or more faster than 0.005 seconds, say .002 seconds for faster samples....we need to digitize the ups and downs.... see?
some DMM have filter that blocks AC signals, (fails) some are just blind to A.C signals on DC range. (Filters inside, etc)
others report peak DC only.
others report the average of DC samples. (bingo)
when the average of 14.7v is at 50 % it reads 1/2 that.
but all this is tedium,, just connect up and see if it works. if you see like 6v, and you turn the bleed (91+) or on early kicks turn the throttle stop and can get 7v , all is good.
it it shows 0v or 12v or 14v all the time, try another dmm. or is not responsive to idle air changes.
when done and at 50% the engine will never lose control of idle ever.
in park or drive, or all accessories ON, or all things loading engine or none.
it helps to have 4 hands,
2 for needles
and 2 more to fiddle DMM ...
my bud calls this jiggery pokery.... funny that..
http://www.fixkick.com