Source V - Keithley SourceMeter 2400 User Manual

6-32 Source-Measure Concepts

Source V

When configured to source voltage (V-Source) as shown in
functions as a low-impedance voltage source with current limit capability and can measure
current (I-Meter) or voltage (V-Meter).
Sense circuitry is used to continuously monitor the output voltage and make adjustments
to the V-Source as needed. The V-Meter senses the voltage at the Input/Output terminals
(2-wire local sense) or at the DUT (4-wire remote sense using the sense terminals) and
compares it to the programmed voltage level. If the sensed level and the programmed
value are not the same, the V-Source is adjusted accordingly. Remote sense eliminates the
effect of voltage drops in the test leads ensuring that the exact programmed voltage
appears at the DUT.
NOTE
The voltage error feedback to the V-Source is an analog function. The source
error amplifier is used to compensate for IR drop in the test leads.
Figure 6-16
Source V
I-Meter
V-Source
Sense Output
Adjust V-Source
(Feedback)
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2400 Series SourceMeter
Figure 6-16, the SourceMeter
+
GUARD
x1
–
GUARD SENSE
Local
IN/OUT HI
Remote
SENSE HI
V-Meter
Remote
SENSE LO
Local
IN/OUT LO
®
User's Manual