Model 6220/6221 Reference Manual Output Connections 2-21
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Figure 2-18
Custom-built test fixture
Test fixture connections
The following describes recommended connections for the test fixture shown in
Figure 2-18. Note that the connectors for (B), (C), and (E) must be insulated from
the metal chassis of the test fixture.
To minimize thermal EMFs, which could corrupt low level measurements, use
copper connectors for the DUT test circuit.
(A) Two 5-way binding posts – wire the binding posts to a normally-open inter-
lock switch as shown in Figure 2-18.
The interlock switch must be installed such that when the lid of the test fixture
is opened the switch will open, and when the lid is closed the switch will close.
When the test fixture lid is opened, the output of the Model 622x will turn off.
The test fixture lid must be closed in order to turn on the output.
Use suitable insulated wires to connect the test fixture interlock to the
INTERLOCK quick-disconnect block on the rear panel of the Model 622x.
Metal Chassis
Noise Shield
or
Metal Guard Plate
Insulated
Terminal
Post (1 of 9)
Safety
Earth
Ground
DUT
1
3
2
Guard
LO
Hi
Lo
Chassis
To
V
oltmeter
Normally-open SPST
momentary switch
(B)
(A)
(C)
(D)
To
622x
(E)
Chassis
screw
terminal
(F)
1 Output High
2 Output Low or Cable Guard
3 Earth Ground
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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