Fluke 8505A - Page 35

8505A
Table
2-6.
Applications
(eont)
APPLICATION
3
REQUIREMENT:
METHOD:
Identify the power
supplies that have
a
tolerance of
15V ±100 mV.
Set high and low limits, Press:
STORE
1—
—
5
——
.
1 HI
STORE
—
—
-1
4 -9
-LO
The
multimeter will now display “HI,”
"LO”,
or “PASS” for each power
supply.
APPLICATION
4
For a group of 20V power supplies, determine the deviation in volts.
Offset the displayed reading
by 20. Press:
Store-
2
-0
-——OFFSET
Any value displayed now
will
equal the deviation from 20V.
APPLICATION 5
REQUIREMENT: Display
the
input error
voltage for
an
operational amplifier by measuring the
dc
output error. Gain
=
2.6847 x 10
4
.
METHOD:
Divide the
measured dc output
error
by a scaling
factor
(the op
amp gain). Press:
STORE
—
—
2
*
—
6
8
4
7
E
xp
-
—
4
—
SCALING
The multimeter will now divide the measured
input
by the
gain of the
op
amp and
display the input error voltage.
Make a series
of measurements
in a
noisy environment. Speed of measurement is
not
important.
Display
only the deviation in
volts.
Allow for extra settling between readings:
Press:
STORE
—
—
3 FILTER
Increase digital filtering (average more samples
per reading). Press:
STORE
—9
-SAMPLE
Offset by the nominal output (e.g., 15V). Press:
STORE-
-1 -5
*
OFFSET
REQUIREMENT:
METHOD:
REQUIREMENT:
METHOD:
2-27