Keithley 6220 User Manual

Model 6220/6221 Reference Manual Output Connections 2-7
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Triax inner shield
The inner shield of the triax connector can be connected to Output Low (to be
compatible with the Keithley Model 220 Current Source) or to Cable Guard.
Output Low is the default connection.
The current source OUTPUT must be OFF in order to change the inner shield set-
ting. Perform the following steps to check or change the inner shield connection:
1. If the current source output is on, press the OUTPUT key to turn it OFF
(“OFF” message is displayed).
2. On the Model 622x, press the TRIAX key to display the CONFIGURE
TRIAX menu.
3. Using the cursor controls, place the blinking cursor on INNER SHIELD and
press the ENTER key to display the TRIAX INNER SHIELD options.
4. Place the cursor on OUTPUT LOW (220 STYLE) or GUARD and press the
ENTER key.
5. Press the EXIT key to return to the normal display state.
Remote programming (triax inner shield)
Changing the inner shield connection can only be done with the current source
OUTPUT OFF. Otherwise, error +403 (Not allowed with output on) will occur.
Commands for triax inner shield connection:
Example – Turns off the current source OUTPUT and connects the inner shield of
the OUTPUT connector to Cable Guard:
OUTPut OFF
OUTPut:ISHield GUARd
Triax output low
Output Low can be connected to Earth Ground (which is the outer shell of the triax
connector), or it can float. By default, Output Low floats.
Perform the following steps to check or change the Output Low connection:
1. On the Model 622x, press the TRIAX key to display the CONFIGURE
TRIAX menu.
2. Using the cursor controls, place the blinking cursor on OUTPUT LOW and
press the ENTER key to display the TRIAX OUTPUT LOW options.
OUTPut:ISHield? ‘ Query connection for triax inner shield.
OUTPut:ISHield <name> ‘
‘
Connect inner shield to Cable Guard or Output Low.
<name> = GUARd or OLOW
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Keithley 6220 Specifications

General

Brand	Keithley
Model	6220
Category	Measuring Instruments
Language	English