
2-12
Connections
2400 Series SourceMeter
®
User’s Manual
Guard selection
Cable guard is used for high-impedance guarding for cables (i.e., coax and triax) and test
fixtures. Ohms guard provides a high-current guard output, which allows in-circuit
guarded ohms measurements. On power-up, cable guard is selected.
NOTE
For 6-wire ohms measurements, use the guard output off mode. See
Section 13
,
“
Front panel output configuration
,” for details on the various output off states
and how to select the guard output off state. See also
Section 4
, “
6-wire ohms
measurements
.”
Front panel guard selection
Perform the following steps to check or change the guard selection:
1.
Press CONFIG and then SOURCE V, SOURCE I, or
Ω
. Changing guard in one
configuration menu changes it in all of the others.
2.
Using the
and
keys, place the cursor (flashing menu item) on GUARD and
press ENTER.
NOTE
Cursor position indicates the present guard selection (OHMS or CABLE). To
retain the present selection, use the EXIT key to back out of the menu structure
and skip the next two steps.
3.
To change the guard selection, place the cursor on the alternate selection and press
ENTER.
4.
Use the EXIT key to back out of the menu structure.
NOTE
Do not use ohms guard with coaxial cabling, or oscillations may occur. Ohms
guard cannot be selected on the 1A or higher range (source or measure).
Remote command guard selection
Use the :SYSTem:GUARd command (
Section 18
, “
SYSTem subsystem
”) to choose
between cable and ohms guard mode via remote. For example, send the following com-
mand to enable ohms guard:
:SYST:GUAR OHMS
Conversely, send this command to enable cable guard:
:SYST:GUAR CABL
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