Voltech AT3600 - Page 87

VOLTECH AT3600 USER MANUAL CREATING THE PROGRAM
TEST PROGRAM EDITOR VPN 98 - 024 PAGE 3.3.15.
Many of the tests available for the AT Series have all four limit types. There are
obviously some tests where it is not sensible to have four limits, IR - Insulation
Resistance - being a clear example where only a minimum limit is applicable, as the
perfect insulation between windings has no upper limit to its resistance.
To choose which type of limit you wish to use, simply use the mouse to click on one
of the buttons % , > < , > or < .
After you have entered the limits in one form, you may change to another form of
limits by clicking with the mouse on another of the buttons.
When you change from one limit type to another, the tester will convert any limits
you have previously entered to match the new type as shown in the following tables:
CONVERSION BETWEEN LIMIT TYPES FOR TESTS OTHER THAN
TR
AND TRL
Conversion Previous
%
nom ← (max + min) / 2
|neg%| ← (nom - min) / nom
pos% ← (max - nom) / nom
> <
nom ← low + 0.01%
|neg%| ← 0.01%
pos% ← 0.01%
>
nom ← upp - 0.01%
|neg%| ← 0.01%
pos% ← 0.01%
<
dB +/-
nom dB ← (max dB + min dB) / 2
|neg dB| ← nom dB – min dB
pos dB ← max dB – nom dB
> <
nom dB ← low + 0.01 dB
|neg dB| ← 0.01 dB
pos dB ← 0.01 dB
>
nom dB ← upp - 0.01 dB
|neg dB| ← 0.01 dB
pos dB ← 0.01 dB
<
> <
min ← nom - |neg%|
max ← nom + pos%
%
min ← nom dB – neg dB
max ← nom dB + pos dB
dB +/-
min ← low
max ← low + 0.02%
>
min ← upp - 0.02%
max ← upp
<
>
low ← nom - |neg%|
%