mfd capacitor

[restez]

hi i would like to know if i have a good run capacitor but dont understand how to do the math on the mfd it is a 7.5 cap and it reads 7.02 is this a good cap and tolerance is 6% how do you calculate the math to tell its good or bad
Thanks

[blownfuse99]

Its so close... A new capacitor is about $ just change it

[Redwood650]

Most people I talk to say they go as far as 10%. I personally go off whatever the cap says. Id recommend replacing it.

[restez]

Most people I talk to say they go as far as 10%. I personally go off whatever the cap says. Id recommend replacing it.

hey thanks but i still want to know how you come to the -6 +6 do you take 7.5 x .06 = 0.45 what is 6%

[restez]

hey thanks but i still want to know how you come to the -6 +6 do you take 7.5 x .06 = 0.45 what is 6%
i want someone to do the math for me here so i can see the steps

[beenthere]

7.5X.06=.45
7.5-.45=7.05

[deon]

7.5x.94=7.05

[Southern Mech]

7.5x.94=7.05

what's the .94? never seen this

[restez]

what's the .94? never seen this

sorry 7.5 x .06 = 0.45

[rundawg]

what's the .94? never seen this

.94 = 94% or 6% less than 100%.

So if the capacitor is less than 94%, it is outside the 6% tolerance.

[hvacrmedic]

what's the .94? never seen this

It's 1 - 0.06.

A little algebra:

7.5 x 0.06 = 0.45
7.5 - 0.45 = 7.05

Substitute the left side of eq.1 for the 0.45 in eq.2. You get

7.5 - 7.5 x 0.06 = 7.05

factor out the 7.5 to get

7.5 (1- 0.06) = 7.05

or

7.5 x 0.94 = 7.05

[hvacrmedic]

It's 1 - 0.06.

A little algebra:

7.5 x 0.06 = 0.45
7.5 - 0.45 = 7.05

Substitute the left side of eq.1 for the 0.45 in eq.2. You get

7.5 - 7.5 x 0.06 = 7.05

factor out the 7.5 to get

7.5 (1- 0.06) = 7.05

or

7.5 x 0.94 = 7.05

Or IOW 94% of 7.5.

[restez]

Excellant thats what i wanted to know thanks man and all you other people i appreciate it i never knew this

It's 1 - 0.06.

A little algebra:

7.5 x 0.06 = 0.45
7.5 - 0.45 = 7.05

Substitute the left side of eq.1 for the 0.45 in eq.2. You get

7.5 - 7.5 x 0.06 = 7.05

factor out the 7.5 to get

7.5 (1- 0.06) = 7.05

or

7.5 x 0.94 = 7.05