4: Source-measure considerations Model 2450 Interactive SourceMeter® Instrument
4-10 2450-901-01 Rev. B/September 2013
Noise shield
Use a noise shield to prevent the introduction of unwanted signals into the test circuit. Low-level
signals may benefit from effective shielding. The metal noise shield surrounds the test circuit and
should be connected to LO, as shown.
Figure 115: Model 2450 Rear Panel Noise Shield Connections
Safety shield
A safety shield must be used whenever hazardous voltages (>30 V RMS, 42 V peak) will be
present in the test circuit. To prevent electrical shock that could cause injury or death,
never use the Model 2450 in a test circuit without a properly installed and configured safety
shield.
The safety shield can be metallic or nonconductive, and must completely surround the DUT test
circuit. A metal safety shield must be connected to a known protective earth (safety ground). See
Test
fixtures (on page 2-81) for important safety information on the use of a metal or a nonconductive
enclosure.
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