Fluke 8050A - 2-26. Resistance (Ω) Operation; 2-28. Conductance (S=1;Ω) Operation; 2-30. Diode Test Operation; 2-32. Relative (RELATIVE) Operation

2-26.
Resistance
(0)
2-27.
Figure
2-5
describes how to operate the
8050A
for
resistance measurements. When
kO
is
selected, erroneous
measurements can occur if power
is
present in the
resistance being measured. Ensure that power
is
removed
before measuring in-circuit resistances. The AC/ DC
function
switch
has
no
effect
during
resistance
measurements.
2-28. Conductance
(S=1/0)
2-29.
Figure
2-6
describes how to operate the
8050A
for
conductance measurements. When
S=
I/
n
is
selected,
two ranges
of
measurements are available, 2
mS
and
200
nS.
To
select either range, press both range switches
(above the grey-shaded area) simultaneously.
2-30.
Diode Test
2-31.
Figure
2-7
describes how to operate the
8050A
for
diode tests. The three resistance ranges with the diode
symbol beside the range value provide a measurement
RESISTANCE
(kCl)
1.
DE-ENERGIZE CIRCUIT TO
BE
MEASURED
2.
SELECT
RANGE---------
3.
SELECT
FUNCTION----
4.
CONNECT TEST LEADS
OPERATION
RELATIVE
voltage sufficient to cause a silicon junction to conduct.
These ranges
(2
kO,
200
kO
and
20
MO)
can be used to
check silicon diodes and transistors. The 2
kO
resistance
range
is
the preferred diode and transistor testing range
and
is
labeled with the largest diode symbol (
* ) .
For
a
silicon diode, the typical forward bias voltage (on the 2
kO
-M
range)
is
0.6V.
A reversed bias silicon diode
should display the overrange indicator (on the 2
kO
*
range).
2-32.
Relative
(RELATIVE)
2-33.
Figure
2-8
describes how to operate the
8050A
for
relative measurements. The relative function stores a
reading as an offset or relative reference value. When the
RELATIVE switch
is
set to
ON
during a measurement,
the value of that measurement
is
stored, and the REL
(relative reference) annunciator appears to the right of the
zeroed display. Subsequent measurements (in the same
function and range) are displayed as the difference
between the measured value and the stored relative
reference.
HIGH(+)~-t-~~-r;=::=:=:;:=::::::s;;::::::':s;;:::::::::::::-;:;;;;:;;:::==~\:====:;::;:::::;-;;:~~~--,
LOW(-)
~-+-~~-;+..:;:...~
\
RELATIVE
~o
OFF
..
Figure 2-5. Resistance
Operation
1-r.,,---·-~---
~
1u
~
OFF
...
2-7