Measuring Resistance - Fluke 187 User Manual

Model 187 & 189
Users Manual
189 LOGGING MULTIMETER
AutoHOLD FAST MN MX LOGGING YES
HOLD HOLD MIN MAX MIN MAX REL REL
CANCEL SAVE NO
Hz Hz % % ms ms RANGE RANGE
SETUP
nS nS
F F
V V mV mV
C C
ac+dc ac+dc
ac+dc ac+dc
A A
V V mA mA
ac+dc ac+dc
A A
mV mV
dB dB
A A
V V
mA mA
dB dB
ac+dc ac+dc
A A
OFF OFF
ac+dc ac+dc
VIEW
CLEAR MEM
TEMPERATURE TEMPERATURE
mA mA
A A COM COM V V
A A
10A MAX
400mA CAT
FUSED
FUSED 1000V
Figure 3-4. DC Voltage Measurement
3-6

Measuring Resistance

Resistance is an opposition to current flow. The unit of
resistance is the ohm ( ). The meter measures resistance
by sending a small current through the circuit.
The meter's resistance ranges are 500.00
50.000 k , 500.00 k , 5.0000 M , 30.000 M , and
500.0 M .
To measure resistance, set up the meter as shown in
Figure 3-5.
All pushbutton functions are available with resistance
measurements. The blue key cycles to continuity and
conductance measurement, which are described later in
this chapter.
+
ach002f.eps
Caution
To avoid possible damage to the meter or to
the equipment under test, disconnect circuit
power and discharge all high-voltage
capacitors before measuring resistance.
Note
In the Ohms Mode, a negative sign (-) on the
display indicates the presence of voltage. This
will cause reading errors.
, 5.0000 k ,