Keithley 2651A Reference Manual page 78

Section 2: General operation
Using shielding and guarding together
The following figures show connections for a test system that uses a noise shield, a safety shield, and
guarding. The guard shields are connected to the driven guard (G) of the SMU. The noise shield is
connected to SMU LO. The safety shield is connected to the chassis and to a safety earth ground.
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Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 22: Connections for noise shield, safety shield, and guarding
Chassis
ground
SENSE/GUARD
S S
LO G G G G HI
G
Chassis
OUTPUT
LO HI
40V, 50A MAX.
LO HI
Test
LO HI
circuit
2651A-901-01 Rev. A / March 2011
Model 2651A chassis
connected to chassis
earth ground through the
power cord
Metal guard
shield
Metal guard shield
Metal noise shield
Metal safety shield
Safety
earth
ground