4: Source-measure considerations Model 2450 Interactive SourceMeter® Instrument
4-12 2450-901-01 Rev. B/September 2013
Floating the Model 2450
INPUT/OUTPUT LO is not internally connected to the chassis and cannot be allowed to float
above chassis ground more than the values shown on the front panel.
If you use an external source in the test system, you may need the Model 2450 to float off chassis
earth ground. An example is shown below, which includes an external voltage source. Notice that
output LO of the external voltage source is connected to chassis ground.
For the test circuit shown below, the Model 2450 must float off chassis ground. As shown, LO of the
Model 2450 is floating +10 V above chassis earth ground. If LO of the Model 2450 was instead
connected to chassis ground, the external voltage source would be shorted to the chassis ground.
Figure 117: Floating the instrument schematic
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