28
1.4. 1.2. Internal Test and Adjust Routine
After initialisation,
th,e PM2521 performs
two series of measurements as shown
in the following flow-chart.
ST
3372
Fig. 21.
Flow-chart
internal test
and
adjust
routine
a) An
AUTO CAL
0,1V
measurement
b) An
AUTO CAL IV measurement
When making the
AUTO CAL
0,1V measurement the
fJiP
programs the
000063 so
that
a current of lOOjuA
flows
through R606, which causes
a voltage drop of
lOOmV across it
(100/tA x 1kl2
).
This voltage
is supplied
to the ADC and is counted
by the
/tP,
stored
in a RAM location
and used as reference for
a normal measure-
ment.
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