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## How can I make mathcad prime use different base units in calculations?  4-Participant

## How can I make mathcad prime use different base units in calculations?

So my starting parameters are P1= 7.5 kW and n1= 750 rpm.

On the left side Mathcad is converting my units to SI which messes with my final results.

For this formula I have to use P1 in kW and n in rpm, which mathcad is changing into W and revolution per second. Right side is how to calculation is supposed to be going by the formula.

Is there a way I can fix this? I saw that in Mathcad 15 you could define a custom unit system. Is there anything like that for Mathcad Prime?

Thank you! 1 ACCEPTED SOLUTION

Accepted Solutions  24-Ruby IV
(To:TS_9501702)

The formula you use has built-in correction factors (60/(2 pi) and 10^6) which are not necessary if you use units in Prime: 4 REPLIES 4  23-Emerald I
(To:TS_9501702)

There is no custom unit feature in Prime. You're not the first to ask for/about it, and probably will not be the last.

So you've changed the unit of the Moment Mt1 from J to N*mm.

You should do the same with the P and the rotations: type a k before the W, and replace 1/s with rpm.

Success!

Luc  4-Participant
(To:LucMeekes)

That one doesn't work. That is the point of the post 😄 I need Mathcad to use kW as base units  24-Ruby IV
(To:TS_9501702)

The formula you use has built-in correction factors (60/(2 pi) and 10^6) which are not necessary if you use units in Prime:   22-Sapphire II
(To:TS_9501702)

@TS_9501702 wrote:

So my starting parameters are P1= 7.5 kW and n1= 750 rpm.

On the left side Mathcad is converting my units to SI which messes with my final results.

For this formula I have to use P1 in kW and n in rpm, which mathcad is changing into W and revolution per second. Right side is how to calculation is supposed to be going by the formula.

Is there a way I can fix this? I saw that in Mathcad 15 you could define a custom unit system. Is there anything like that for Mathcad Prime?

Thank you! Mathcad hasn't really messed with your units.  You need to tell it (effectively) that your base unit of time is the minute, or, more specifically, ... Stuart Announcements
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