UNI-T UT8805E Manual page 20

Note: all ranges are allowed to exceed range by 20%.
4) Relative value setting
Turn the relative operation on, the displayed value is the actual measured value minus the setting relative
value. About relative value setting, please refer to 2.10 Mathematical Functions.
5) Measured value reading
Press [Speed] to select proper reading speed and read the measured value.
6) History data review
User can check the history data by number, bar chart, trend chart, and histogram.
Note: Relative operation is recommended in low resistance measurement, which can eliminate test lead
impedance error.
B. 4-wire Resistance Measurement
When the measured resistance is low, error will be caused by test lead resistance and contact resistance
in circuit. Therefore, 4-wire measuring mode is necessary for a precise measurement.
Steps:
1) Press
button, and then press
as Figure 2-15.
2) Connect the test leads to the measured resistance as Figure 2-16, connect the red test lead to
terminal HI, and the black one to terminal LO. The test leads above are constant current source output
circuits. Connect the red test leads to terminal Sense HI, and the black one to terminal Sense LO,
and these 2 test leads are voltage gauging circuits.
3) Select proper current range according to the input resistance.
Range
button to enter interface of 4-wire resistance measurement,
Figure 2-15 Interface of 4-wire resistance measurement
Figure 2-16 Connection of 4-wire resistance measurement
200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ, 10MΩ,100MΩ
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UT8805E Benchtop Digital Multimeter