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The 3468A
is capable of measuring resistance from .1 milli-ohm to 30 Megohms
in six ranges. Resistance measurements
may be made in either 2- or 4-wire ohms
configuration.
The illustrations in Figure 2-4 show
how
resistance
measurements
are made.
A known
current
is supplied
by the 3468A
and flows through the
unknown resistance. The DC voltmeter measures the attendant voltage across the
resistor
and
calculates
the
resistance.
Table
2-5
shows
the
nominal
current
through the unknown resistance for the individual ohms ranges. Resistances in ex-
cess of 30 Megohms
may be measured using the extended ohms mode.
(4 wine)
(2 wine)
26148
(TYPE 4404
THERMISTOR
AT 20°C)
ALL TERM
*500Vpk
MAX
MEASURED RESISTANCE
/
IS 2816.049 AN ERROR
d
3A/250V
OF .07%.
FUSE
"intemal to the 3468A
2-WIRE OHMS MEASUREMENT
4-WIRE OHMS MEASUREMENT
Figure 2-4. Resistance Measurements
2-Wire Ohms
22
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