8508A
Users Manual
OHMS Configuration (Resolution, Filter, Fast, Low Current and 4-Wire Operation)
Press the
Config key to see the OHMS CONFIG menu.
adj074f.eps
OHM CONFIG Menu
Provides selection of the resolution for subsequent readings.
Controls a single-pole analog filter for increased noise rejection.
The Filter annunciator on the left-hand display indicates that the filter is
active.
Note
The pole or time constant of the filter is formed by a
Capacitance of 22 nF across the resistor under test.
Select a higher read rate. This will result in an increase in uncertainty due
to noise.
The Fast annunciator on the left-hand display indicates that the higher read
rate is active.
Controls the measurement currents. The current in use for the selected
range is indicated in the left-hand display together with the maximum
voltage that will appear across the measured resistance at full scale.
With LoI selected the behaviour of Auto Ranging is modified such that the
Multimeter will only range up to the 20 MΩ Range.
Note
Low Current resistance measurement may be desirable to
reduce any self-heating in the device under test or to avoid
conduction of any parallel semi-conductor junction.
Selects 4-wire resistance measurements in which the stimulus current is fed
through the test resistance from the instrument's
INPUT Hi and Lo
terminals. The resulting potential difference is sensed by the
SENSE Hi
and
Lo terminals. Otherwise all measurements are 2-wire, current being
sourced and potential differenced sensed from the
INPUT Hi and Lo
terminals.
The 4wΩ annunciator in the left-hand display indicates that 4 wire sensing
is active.
3-12
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