8588A/8558A
Operators Manual
34
• 2W HV Ω: This mode provides 2-wire measurements of resistance, in decade
ranges from 10 MΩ to 10 GΩ. The measurement is performed at High
Voltage using a current source with high compliance. The resulting increase
in current through the unknown resistor reduces uncertainties due to leakage
and bias current. HV Ω may also be used in conjunction with the Normal Ω
mode to determine voltage coefficient in the unknown resistor. The
MAXIMUM voltage that could appear across the measured resistor is 240 V.
No autoranging is provided in this function. The range and current used for
each range are shown in the information portion of the display. See Table 9
for the current stimulus used based on the ohm range of the Product.
• 4W HV Ω: This mode is the same as 2W HV ohms except it uses the 4-Wire
measurement method.
XWWarning
To prevent possible electrical shock, fire, or personal injury:
• Do not connect external capacitance >50 nF to the Product
terminals. The maximum voltage across the measured
resistor or open Product terminals while using the HV Ω
function is 240 V. The maximum current that the Product will
source while using HVΩ 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 product. However,
capacitors (>50 nF) external to the Product could
accumulate LETHAL charge while making a HVΩ
measurement. Do not touch the Product terminals or
circuitry under test unless you are sure it is safe to do so.
• Do not exceed the Measurement Category (CAT) rating of
the lowest rated individual component of a Product, probe,
or accessory.
• Only use probes, test leads, and accessories that have the
same measurement category, voltage, and amperage ratings
as the Product.
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