Sense Selection - Keithley SourceMeter 2400 User Manual

Sourcemeter 2400 series source measure unit
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4-8
Ohms Measurements
Figure 4-3
4-wire resistance sensing
SourceMeter
Input/Output HI
4-wire Sense HI
I
V
M
4-wire Sense LO
Input/Output LO

Sense selection

Use the following procedure to select 2-wire or 4-wire sense operation:
Press CONFIG then Ω to display the ohms configuration menu.
1.
2.
Select SENSE MODE, then press ENTER.
3.
Select 2-WIRE or 4-WIRE as desired, then press ENTER.
4.
Press EXIT to return to normal display.
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2400 Series SourceMeter
R
LEAD
Sense Current (pA)
R
LEAD
Lead
V
M
Resistances
R
LEAD
R
LEAD
I
= Current sourced by SourceMeter
V
= Voltage measured by SourceMeter
M
V
= Voltage across resistor
R
Because sense current is negligible,
V
V
V
M
R
and measured resistance =
=
I
I
®
User's Manual
Test Current (I)
Resistance
V
R
R
S
Under Test
=
V
M
R

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