8508A
Users Manual
The MAXIMUM voltage that could appear across the measured resistor is 240 V.
No autoranging is provided in this function.
Warning
DANGER OF LETHAL ELECTRIC SHOCK
To avoid LETHAL electrical shock DO NOT CONNECT EXTERNAL
CAPACITANCE greater than 50 nF to the Multimeter terminals.
The maximum voltage across the measured resistor or open Multimeter
terminals while using the HiVΩ function is 240 V. The maximum current
that the Multimeter will source while using HiVΩ is 10
µA (Lo to Hi), or
2.0 mA (Guard to Hi if Ext Guard is selected). These characteristics are
not considered “Hazardous Live” within the Safety standards applied
to this instrument. However, capacitors (>50 nF) external to the
Multimeter could accumulate LETHAL charge while making a HiVΩ
measurement. DO NOT TOUCH the Multimeter terminals or circuitry
under test unless you are sure it is safe to do so.
CAUTION
To avoid equipment damage when using the HiVΩ function make sure
that circuits or components connected to the Multimeter can withstand
at least 240 V dc.
HiVΩ Configuration (Resolution, Filter, and 4-Wire Operation)
Press the
Config key to see the HiVΩ CONFIG menu.
adj079f.eps
HiVΩ 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.
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 difference being sensed from the
INPUT Hi and Lo
terminals.
3-14
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