Fluke 83V FE 83V & 87V Users Manual - Page 26

Measuring Resistance, power and discharge all high-voltage

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80 Series V Users Manual Measuring Resistance WCaution 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. The Meter measures resistance by sending a small current through the circuit. Because this current flows through all possible paths between the probes, the resistance reading represents the total resistance of all paths between the probes. The Meter's resistance ranges are 600.0 Ω, 6.000 kΩ, 60.00 kΩ, 600.0 kΩ, 6.000 MΩ, and 50.00MΩ. To measure resistance, set up the Meter as shown in Figure 5. The following are some tips for measuring resistance: • The measured value of a resistor in a circuit is often different from the resistor's rated value. • The test leads can add 0.1 Ω to 0.2 Ω of error to resistance measurements. To test the leads, touch the probe tips together and read the resistance of the leads. If necessary, you can use the relative (REL) mode to automatically subtract this value. • The resistance function can produce enough voltage to forward-bias silicon diode or transistor junctions, causing them to conduct. If this is suspected, press C to apply a lower current in the next higher range. If the value is higher, use the higher value. Refer to Table 18. 18

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80 Series V
Users Manual
18
Measuring Resistance
W
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.
The Meter measures resistance by sending a small
current through the circuit. Because this current flows
through all possible paths between the probes, the
resistance reading represents the total resistance of all
paths between the probes.
The Meter's resistance ranges are 600.0
Ω
, 6.000 k
Ω
,
60.00 k
Ω
, 600.0 k
Ω
, 6.000 M
Ω
, and 50.00M
Ω
.
To measure resistance, set up the Meter as shown in
Figure 5.
The following are some tips for measuring resistance:
•
The measured value of a resistor in a circuit is often
different from the resistor's rated value.
•
The test leads can add 0.1
Ω
to 0.2
Ω
of error to
resistance measurements. To test the leads, touch
the probe tips together and read the resistance of the
leads. If necessary, you can use the relative (REL)
mode to automatically subtract this value.
•
The resistance function can produce enough voltage
to forward-bias silicon diode or transistor junctions,
causing them to conduct. If this is suspected, press
C
to apply a lower current in the next higher
range. If the value is higher, use the higher value.
Refer to Table 18.