Voltech AT360, User Manual

Page: 313 / 470

V
OLTECH
AT
I
U
SER
M
ANUAL
P
AGE
7-15
If the "User Offset Enabled" check box is checked, a value can be entered into
the edit box. The value entered (in the units shown) is then added to any
results returned from the AT tester. This function can be used to adjust for
measurement fixture effects that cannot be compensated for or to compensate
the fixture manually so a compensation stage is not required to obtain the
correct readings.
Choosing Test Limits
The test limits can be:
% A nominal value together with + and – percentage limits.
>< Minimum and maximum values
> A minimum value only
< A maximum value only
Use the PC Editor’s ‘Measure’ button (together with a sample part) if you are
unsure of the nominal value.
Remember to click on the units of limits (mOhm, Ohm etc.) when entering
absolute values as limits.
Normally it is important to set a maximum limit as closely to the nominal value
as possible to ensure that the correct wire has been used. Typically a limit of
+5% or +20m
Ω
whichever is greater is set.
The minimum value is not usually so critical. It can be set to any value that
ensures that there is no solder splash causing a short circuit between pins.
Typically –20%.