Keithley 6220 Reference Manual page 68

2-14 Output Connections
For the test circuit shown in
configured to float off Earth Ground. As shown, Output Low of the Model 622x is
floating +10V above Earth Ground. If Output Low of the Model 622x was instead
connected to Earth Ground, the voltage source would be shorted through Earth
Ground.
In order to float the current source, Output Low must be disconnected from Earth
Ground. The floating configurations are shown in
See "Triax output low," on page 2-7
configuration.
WARNING
Figure 2-10
Floating the Model 622x current source
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Figure
When floating the Model 622x, an electric shock hazard may
exist between Output Low of the Model 622x and Chassis:
• The chassis of the Model 622x must be connected to Earth
Ground. Use the chassis ground screw on the rear panel for
connection to a known safety Earth Ground.
• The test circuit must be surrounded by a safety shield that is
connected to a safety Earth Ground (see
nections," on page
+
NOTE
Return to Section 2 topics
Model 6220/6221 Reference Manual
2-10, the Model 622x current source must be
Figure 2-4B and
for details on selecting the floating
2-16).
Figure 2-5B.
"Safety shield con-