2: Connections and configuration Model 4200A-SCS Parameter Analyzer
2-2 4200A-901-01 Rev. C / February 2017
The maximum allowed voltage between circuit COMMON and chassis ground is ±32 VDC.The
maximum allowed voltages between the preamplifier signals are:
COMMON to chassis ground: 32 V
peak
GUARD to COMMON: 250 V
peak
SENSE or FORCE to GUARD: 40 V
peak
Shielding and guarding
Many test situations require that the device under test (DUT) be shielded or guarded (or both) to
avoid detrimental effects caused by electrostatic interference, parasitic capacitance, system leakage
currents, and so forth.
• If the device is to be shielded (but not guarded), connect the DUT shield to COMMON (see the
next figure).
• If the device is to be guarded, connect the DUT shield to GUARD (inner shield of triaxial cable;
see the next figure).
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 4200A-SCS in a test circuit without a properly installed and configured safety
shield.
See Guarding (on page 3-23) for more information on the principles and advantages of guarding.
Figure 2: Device shielding
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