2600S-901-01 Rev. C / January 2008 Return to Section Topics 3-21
Series 2600 System SourceMeter® Instruments Reference Manual Section 3: DUT Test Connections
WARNING The maximum floating (common mode) voltage for a SMU is ±250V.
Exceeding this level may cause damage to the instrument and
create a shock hazard.
Using an external source to float a SMU could create a shock
hazard in the test circuit. A shock hazard exists whenever >42V
peak is present in the test circuit. Appropriately rated cables or
insulators must be provided for all connections to prevent access
to live parts
When >42V is present, the test circuit must be insulated for the
voltage used or surrounded by a metal safety shield that is
connected to a known safety earth ground and chassis ground (see
"Safety shield" earlier in this section).
Figure 3-23
V-source
HI
LO
Series 2600
SMU
10V
+10V
Chassis Earth Ground
Low
Output low connected
to chassis
Series 2600 LO
NOT connected
to chassis ground
(floating)
High
+ 
Chassis
Chassis
Source chassis connected to chassis
earth ground through the power cord
External Source
Series 2600 chassis connected
to chassis earth ground
through the power cord
+

Floating the Series 2600
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