Fluke 8505A - Page 23

8505A
2-42.
Measurement
parameters
(range, sample,
filter,
trigger,
averaging,
zero) define all operations
that affect
the
resolution, stability, and accuracy
of the reading. For
example, the range is specified to position
the decimal
point,
and the filter mode
may be changed to improve
noise rejection.
2-43.
Mathematic operations
(External Reference
or
Scaling, Offset)
alter the reading
to operator
requirements. For example, when
Offset is used,
only the
difference between the reading
and the offset
value is
displayed.
2-44.
Special operations
(limits,
peak) specify how
the
reading is used. For example,
Peak mode
can be used
to
continuously
update a record of
the highest
and lowest
readings, or Limits mode
may be used
for a HI,
LO,
PASS display of the
measurement
reading.
A
comprehensive
setup routine is
summarized in
Figure 2-3.
All or part
of this routine can
be used to
establish or
change measurement
parameters,
mathematic
operations,
or special operations.
2-45.
Error codes
usually identify
any
programming
problem
and specify
a solution (refer
to Table
2-4).
A
numeric entry
may be aborted
at any time
prior to
termination
by pushing the CE
button. The
multimeter
responds by displaying
another
numeric
entry
may
now be made, or
the displayed value
may
be stored
by
pushing the desired terminator
button.
A
store or
recall
operation
can
be entirely
aborted prior
to
execution
by
pressing STORE
or RECALL
a second
time.
The
multimeter reverts
to its state prior
to the
store or
recall
once
a momentary Error
C
condition
elapses.
NOTE
Errors
due to thermal
emfs should
be
considered when
making low
level,
high
resolution measurements.
Thermal
emfs
( voltages
produced
by temperature
differences
between
contacts
of
two
dissimilar
metals
or
by
temperature
gradients
along
a
length
of
material
')
may cause
differences
of
several microvolts.
The use
of
low
emf,
shielded cables with
copper spade
lugs is
recommended to minimize
thermal
emf
errors.
If multiple
programming steps are required,
button
(s)
shown for the action
described.
use
the sequence
presented here
as a
general
guide. Use the push
INITIALIZATION
CONFIGURATION AT POWER-UP OR RESET
(V DC, 1000V,
Auto, Sample
7,
Filter F0, zero mode ON, no other modes
or
values).
Calibration mode must be off
before
power-off.
STEP ACTION
PUSH BUTTONS
1 FUNCTION selection
a. Reselecting
V DC sets
autoranging.
V AC
A DC
b. Push V AC and V DC
simultaneously
to
measure ac voltage on
a dc level
(with RMS
converter option -09A).
A AC
OHMS
CONFIGURATION
AT
FUNCTION
CHANGE
(Autorange;
previous
filter,
sample and
trigger
retained;
all
other
modes
off
but respective
values
retained.)
Figure
2-3.
Programming
Hierarchy
2-15