5-8 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 User’s Manual
Return to Section 5 topics
DUT test connections
WARNING Before making or breaking test connections, the Models 622x
and 2182/2182A must be turned off and the line cords must be
disconnected from AC line power.
DUT test connections are shown in Figure 5-5. This connection scheme uses
Cable Guard and an earth grounded test fixture that is equipped with an interlock
switch. See Section 2 of this manual for connection information. See Section 2 of
the Reference Manual for details on the principles of Cable Guard and guidelines
for test fixture requirements.
Figure 5-5
Guarded test connections
DUT
High
Low
HI
LO
OUTPUT
connector
Keithley 622x
Current Source
(Inner shield set
as Guard)
Channel 1
Guard
Test Fixture
Connect test fixture to a known
safety earth ground using #18
AWG (or larger) wire.
WARNING
Rear
Panel
Front
Panel
Triax Cable
2107
Input Cable
(Black)
INTERLOCK
connector
Interlock Cable
Interlock Switch
The triax cable and input cable shown in this drawing are
supplied with the Keithley Models 622x and 2182/2182A.
(Red)
(Green)
Guard Plate
WARNING
The voltage levels
on the Guard and
High terminals are
the same. A safety
hazard exists when
the OUTPUT is 30V
rms (42V peak) or
more.
Note
Keithley 2182/2182A
Nanovoltmeter
NOTE For this connection scheme, the inner shield of the
Model 622x OUTPUT connector must be connected to
the driven guard. See “Triax inner shield” on page 2-6 for
details on connecting the inner shield of the OUTPUT
connector to Cable Guard.
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