Resistance Operation - Fluke 8050A Instruction Manual

2-26. Resistance (0)
2-27. Figure 2-5 describes how to operate the S050A 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/Q)
2-29. Figure 2-6 describes how to operate the S050A for
conductance measurements. When S=I/0 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 S050A for
diode tests. The three resistance ranges with the diode
symbol beside the range value provide a measurement
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
i*
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 S050A 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.
RESISTANCE (kO)
1. DE-ENERGIZE CIRCUIT TO BE MEASURED
2. SELECT RANGE - - - - - - - - -
3. SELECT FUNCTION -----,.
4. CONNECT TEST LEADS
LOW (-)
--F===?/r+--~~
2
\
8050A IIGITAl MUI IMETER
RELATIVE
.2:0
OFF
. .
POWER
0.2!
OFF
..
Figure 2-5. Resistance Operation
2-7