Series 2600 System SourceMeters Reference Manual DUT Test Connections 3-11
Return to Section 3 topics 2600S-901-01 Rev. A / May 2006
The metal noise shield surrounds the test circuit and should be connected to SMU
LO (as shown in
Figure 3-10), and can also be connected to the chassis ground
screw on the rear panel of the Series 2600.
Figure 3-10
Noise shield
Safety shield
A safety shield must be used whenever hazardous voltages (>30Vrms, 42Vpeak)
will be present in the test circuit. The safety shield can be metallic or nonmetallic,
and must completely surround the DUT test circuit. A metal safety must be
connected to a known safety earth ground and chassis ground (See “
Test fixture”
later in this section for important safety information on the use of a metal or non-
metallic enclosure.).
Model 2601/2602 safety shield
The maximum output voltage for a Model 2601/2602 channel is 40V, which is
considered a non-hazardous level. However, using two or more Model 2601/2602
voltage sources in a series configuration can cause test circuit voltage to exceed
42V. For example, the SMUs of two Model 2601/2602 instruments can be
connected in series to apply 80V to a DUT (see
Figure 3-11).
The connections for the test configuration in Figure 3-11 are shown in Figure 3-
12. Use #18AWG wire or larger for connections to safety earth ground and chas-
sis.
NOTE Floating an SMU may also cause test circuit
voltage to exceed 42V (see “
Floating an SMU”
later in this section).
DUT
HILO
Noise Shield
CHANNEL A
LO GLO HI G G G HI
SS
KEITHLEY Series 2600
Noise shield
connected to
In/Out LO
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