Keithley 6430 User 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 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
I-Meter
V-Meter
Guard
Cable Guard
Local
Local
Remote
Remote
_
+
x1
4-WIRE SENSE LO
INPUT/OUTPUT LO
GUARD SENSE
V,Ω Guard
REMOTE
PreAmp
A
SENSE
IN/OUT HIGH
Preamp
HI (Input/Output)
Guard (Cable)
LO (Input/Output)
HI (Sense)
Guard (Cable)
LO (Input/Output)
V-Source
Sense
Output
Adjust
V-Source
Feedback
NOTE: The voltage error feedback to the V-Source is an analog
function. The source error amplifer is used to
compensate for IR drop in the leads.
Figure 5-10
Source V

Keithley 6430 Specifications

General

Brand	Keithley
Model	6430
Category	Measuring Instruments
Language	English