Model 2461 Interactive SourceMeter® Instrument Reference Manual
Section 4: Source-measure considerations
2461-901-01 A/November 2015
4-11
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 151: Model 2461 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 2461 in a test circuit that may contain hazardous voltages 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
(on page 2-95) for important safety information on the use of a metal or a nonconductive
enclosure.
