1-8 Return to Section Topics 2400S-903-01 Rev. E / September 2011
Section 1: Introduction Series 2400 SourceMeter® Quick Start Guide
NOTE Specified accuracies for both source and measure are achieved only
using 4-wire remote sensing.
Cable guard
When testing high-impedance DUT (>1GΩ), cable guard is used to drive the shields of cables and
test fixtures to minimize leakage currents and input capacitance. A typical connection scheme
using cable guard is shown in Figure 5. The following menu sequence selects cable guard:
Press CONFIG > press SOURCE V (or SOURCE I or MEAS Ω) > select GUARD > select CABLE
The guard terminal of the SourceMeter is at virtually
the same potential as input/output HI.
Therefore, if there is hazardous voltage at input/output HI, it is also present on the guard shield for
the test circuit.
WARNING To prevent injury from electric shock, the guard shield must be
enclosed in a safety shield (i.e., test fixture) that is connected to
safety earth ground (as shown in Figure 5).
INPUT/
OUTPUT
4-WIRE
SENSE
HI
LO
IEEE-488
(ENTER IEEE ADDRESS
WITH FRONT PANEL MENU)
V, Ω
GUARD
GUARD
SENSE
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