Figure 5-10 Source V - Keithley 6430 Instruction Manual

5-20 Source-Measure Concepts
Source V
When configured to source voltage (V-Source) as shown in Figure 5-10, the SourceMeter
functions as a low-impedance voltage source with current limit capability and can measure cur-
rent (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
Figure 5-10
Source V
V-Source
NOTE: The voltage error feedback to the V-Source is an analog
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.
Mainframe
_
x1
+
I-Meter
Sense
Output
V-Meter
Feedback
Adjust
V-Source
function. The source error amplifer is used to
compensate for IR drop in the leads.
GUARD SENSE
V,Ω Guard
Guard Cable Guard
Local
A
Remote
Preamp
REMOTE
PreAmp
Remote
4-WIRE SENSE LO
Local
INPUT/OUTPUT LO
IN/OUT HIGH
HI (Input/Output)
Guard (Cable)
LO (Input/Output)
SENSE
HI (Sense)
Guard (Cable)
LO (Input/Output)