Connection Considerations - Keithley 4200-SCS Reference Manual

Section 4: Connections and Configuration

Connection considerations

Maximum signal limits
WARNING
CAUTION
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, etc.
• If the device is to be shielded (but not guarded), connect the DUT shield to COMMON
(see
• If the device is to be guarded, connect the DUT shield to GUARD (inner shield of triax cable;
see
WARNING
See Guarding
4-4
Hazardous voltages that may result in personal injury or death can be
present on the signal connectors if the safety interlock is asserted. See
Safety interlock connections
The maximum allowed voltage between circuit COMMON and chassis
ground is ±32V DC.
The maximum allowed voltages between the various PreAmp signals are:
COMMON to chassis ground:
•
GUARD to COMMON:
•
SENSE or FORCE to GUARD: 40 V peak
•
Figure 4-1).
Figure 4-2).
Hazardous voltage can be present on GUARD if the safety interlock is
asserted. To avoid a shock hazard that could result in personal injury or
death, surround the guard with a safety shield that is properly connected
to COMMON and/or safety ground using #18AWG or larger wire.
in Section 5 for more information on the principles and advantages of guarding.
Return to
later in this section.
32Vpeak
250 V peak
Section Topics
Model 4200-SCS Reference Manual
4200-901-01 Rev. S / May 2017