2-8 Output Connections Model 6220/6221 Reference Manual
Return to Section 2 topics
3. Place the cursor on FLOATING or EARTH GROUND, and press the
ENTER key.
4. Press the EXIT key to return to the normal display state.
Remote programming (triax output low)
Commands for output low connection:
Example – Disconnects (floats) triax output low from Earth Ground:
OUTPut:LTEarth OFF
Guards
Guard overview
The Model 622x provides two guards: Triax Cable Guard and banana jack Guard.
Cable Guard – This guard provides a voltage that is at essentially the same
potential as Output High of the Model 622x. Guarding may greatly reduce leakage
current and capacitance in the test circuit. Effective guarding requires that the
triax Cable Guard configuration be used for the triax cable and a guard plate be
used for the Devide Under Test (DUT). For details on “Triax Cable Guard” refer to
page 2-9.
Banana Jack Guard – This guard is similar to cable guard in it provides a voltage
that is essentially the same potential as Output High (1mV accuracy, typical). This
guard should not be used to guard a triax cable. Rather, banana jack guard is
designed for use with a voltmeter to make measurements on a high-impedance
DUT. This guard serves as a x1 buffer amplifier to eliminate loading errors that
may occur as the impedance of the DUT approaches the voltmeter input imped-
ance. For details, see “Banana Jack Guard,” on page 2-12.
The differences between the two guards are summarized as follows:
OUTPut:LTEarth? ‘ Query connection for output low.
OUTPut:LTEarth <b> ‘
‘
‘
Enable or disable triax output low connection to Earth
Ground.
<b> = ON (Earth Ground)
= OFF (Floating)
Triax Cable Guard Banana Jack Guard
10mV Accuracy (typical) 1mV Accuracy (typical)
Use for cable and DUT guarding Use to measure voltage
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