Fluke II Series - Front Panel Input Methods; Numeric Keypad Entry; Polarity and DC Conversion

Theory
of
Operation
DETAILED
DESCRIPTION
A
series of 10 minor
cycle
conversions
occurs without
taking
time for
an autozero
phase
between the
conversions.
These minor
cycle conversions,
or
samples,
occur
at a rate of
25
per
second,
and are
used to provide
the fast
response bar-graph
display
and fast
autoranging.
New samples
are
taken every
40 ms. Ten
samples
are summed
to produce
a full-
resolution digital
display,
with full
scale greater than
3200
counts. A
50-ms
autozero
phase
occurs following
every 10 sample
sequence.
Table
2-1.
SI Function
Codes
FUNCTION
B0
B1
B2
ACV
1
1
1
DCV
0
1
1
300 mV
0
0
0
Ohms
0
0
1
ml)
1
0
0
ACA
1
1
0
DCA
0
1
0
1
=
VDD
0
=
(common)