2-2 Output Connections Model 6220/6221 Reference Manual
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Output connectors
Triax connector
Current source output is accessed at the 3-lug female triax connector on the rear
panel. Use a 3-slot male triax cable to make connections to this connector. A triax
cable terminated with alligator clips (Model 237-ALG-2) is supplied for the Model
622x (see “Supplied triax cable,” on page 2-15). The triax connector is shown in
Figure 2-1.
Figure 2-1
Triax connector and ground point
Triax connector terminals
The triax connector terminals are summarized as follows. For details on these ter-
minals, see “Output configurations,” on page 2-5.
Center conductor – The center conductor of the triax connector is always con-
nected to Output High of the current source.
Inner shield – The inner shield of the triax connector can be connected to Output
Low or Cable Guard. See “Triax inner shield,” on page 2-7 for details on the inner
OUTPUT
FVR
Earth
Ground
Chassis
622x
Earth
Ground
Chassis
EARTH GROUND is a local signal ground and is defined as
the outer shield (shell) of the triax connector.
CHASSIS is defined as the metal chassis of the Model 622x.
1) Frequency Variable Resistor (FVR) Isolates
the current source from high frequencies on
the chassis. For DC to 60Hz, the FVR is a
virtual short (zero ohms).
2) DO NOT use the Chassis Screw terminal to
make signal connections to external circuitry.
High frequency (>1MHz) on the chassis may
result in higher noise at the output.
Chassis screw terminal is connected to the metal chassis of the
Model 622x.
Chassis
Screw
Center conductor Output High
Inner shield Output Low or Cable Guard
Outer shield
(Earth Ground)
1
2
Output Low for guarded configuration.
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