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I want to know how \$ \frac{mm}{Ampere}\$ (which is the unit of current sensitivity of PMMC instruments) is defined?
i.e, How \$ mm \$ is defined in terms of \$ degrees\$ ?

For eg.:
\$ \frac{rad}{Ampere}\$ (another unit of current sensitivity of PMMC instruments) is defined as number of \$ radians \$ of deflections of PMMC (Permanent Magnet Moving Coil) instruments for \$1 \, Ampere\$ current input ,
where, \$ \quad \pi \, rad = 180^{ \circ } \$

I searched it in internet but could not find there, so please anyone help...

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    \$\begingroup\$ I searched it in internet but could not find there ...... what text were you searching for? \$\endgroup\$
    – jsotola
    Commented Mar 8, 2019 at 4:22
  • \$\begingroup\$ Current sensitivity units \$\endgroup\$
    – Suresh
    Commented Mar 8, 2019 at 4:23
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    \$\begingroup\$ i took text from your question and found a few hits ..... unit of current sensitivity of PMMC instruments ....... i do not know if the results are useful to you \$\endgroup\$
    – jsotola
    Commented Mar 8, 2019 at 4:31
  • \$\begingroup\$ Please share its link... \$\endgroup\$
    – Suresh
    Commented Mar 9, 2019 at 13:51
  • \$\begingroup\$ duckduckgo.com/… \$\endgroup\$
    – jsotola
    Commented Mar 11, 2019 at 1:58

1 Answer 1

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The meter scale is some radius r from the pivot so the movement it traces along a circular path would be proportional to the angle.

The circumference of the whole circle path is \$2\pi r\$ for 360° (2\$\pi\$ radians), so you can easily work out the number of mm per angular degree (or radian) of pointer rotation along the scale.

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