5: Source-measure considerations 2470 High Voltage SourceMeter Instrument
5-12 2470-901-01 Rev. A / May 2019
Safety shielding
Use #16 AWG wire or larger for connections to safety earth ground and chassis.
For more detail on shielding, refer to the The Low Level Measurements Handbook: Precision DC
Current, Voltage, and Resistance Measurements.
Figure 97: Model 2470 rear-panel noise and safety shields
Noise and chassis ground
Using the chassis as a ground point for signal connections to the 2470 chassis may result in different
levels of noise, depending on your setup. If the 2470 common-mode current is channeled to the
chassis instead of the device, the tie point to the chassis can help quiet measurements. However, if
other equipment is connected to the chassis, you may have more noise because of other connected
equipment.
If you choose to use the chassis as a ground point for signal connections, use the 2470 chassis
screw as a connection point.
For more information on preventing noise problems, refer to the Keithley Instruments Low Level
Measurements Handbook, available on tek.com/keithley
.
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