High Voltage SourceMeter Instrument Reference Manual Section 5: Source-
2470-901-01 Rev. A / May 2019 5-13
Floating the 2470
SENSE LO and FORCE LO are not internally connected to the chassis. Do not allow them to
float above chassis ground more than 250 V. Failure to adhere to these guidelines can result
in personal injury or death due to electric shock.
If you use an external source in the test system, you may need the 2470 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 2470 must float off chassis ground. As shown, LO of the 2470 is
floating +10 V above chassis earth ground. If LO of the 2470 was instead connected to chassis
ground, the external voltage source would be shorted to the chassis ground.
Figure 98: Floating the instrument schematic
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