User manual

2-8 Connections 2400 Series SourceMeter
®
User’s Manual
Guarding methods
Cable guard
Use the high-impedance (cable) guard connection scheme shown in Figure 2-4
for the following source-measure condition:
• Test circuit impedance is >1GΩ.
Note that cable guard must be selected for this connection scheme. See “Guard
selection,” page 2-13, to select cable guard.
A test fixture is typically used when testing high-impedance devices. The test fix-
ture reduces noise and protects the user from a potentially hazardous voltage on
the guard shield (or plate). See Section 6, “Guard,” for details on using guard.
Note that the test fixture chassis is connected to In/Out LO to reduce noise.