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Features and Functions
Negative Resistance Measurements
Under certain conditions, the instrument may report negative resistance measurements. These may occur
in 2-wire and 4-wire resistance measurements or continuity measurements.
Conditions that may cause negative ohms values include:
Changes in Front/Rear switch contact resistance
l
Reversed Sense Hi and Lo leads
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Circuits with external bias or thermal voltages at circuit connections
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Changes in measurement connection after a NULL operation
l
Under the same conditions, the 34401A returns the measurement's absolute value so as to prevent the
confusion associated with negative readings. The Keysight Truevolt Series DMMs will return negative val-
ues. This allows the most accurate results after a NULL operation.
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Keysight Truevolt Series Operating and Service Guide
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