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2400S-903-01 Rev. E / September 2011
Section 1: Introduction
Series 2400 SourceMeter® Quick Start Guide
NOTE Guard current (I
G
) must never exceed 50mA. If it does, guard voltage
will become less than the output voltage and corrupt the
measurement.
Figure 1-6
Guarded ohms measurements
Remote command programming
Table 1 lists the SCPI commands to select terminals, sense, and cable guard.
Basic SourceMeter operations
Fundamental SourceMeter operations include source-measure, measure only (V or I) and
measure ohms.
Source-measure
There are four source-measure combinations for the SourceMeter:
Source V, Measure I
Source I, Measure V
Source V, Measure V
Source I, Measure I
The basic procedure to source-measure is provided in Table 2. It assumes that the DUT is already
connected to the SourceMeter as explained in
Basic connections
.
Table 1-1
SCPI commands; terminals, sense, and cable guard
Command
Description
:ROUTe:TERMinals <name> Selects terminals; <name> = FRONt or REAR.
:SYSTem:RSENse <b>
Selects sense mode; <b> = ON (4-wire) or OFF (2-
wire).
:SYSTem:GUARd <name>
Selects guard mode; <name> = CABLe or OHMS.
DUT
V,
Ω
Guard
Sense HI
In/Out HI
In/Out LO
Sense LO
Guard Sense
Sense Mode: 4-wire
C. 6-wire connections
DUT
V,
Ω
Guard
In/Out HI
In/Out LO
Sense Mode: 2-wire
A. Basic connections
DUT
V,
Ω
Guard
In/Out HI
In/Out LO
Guard Sense
Sense Mode: 2-wire
B. Connections using guard sense
<1k
Ω
R
G
I
G
≥
1k
Ω
R
G
I
G
R
0V
R
0V