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Connections
2-13
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.
The guard setting (cable or ohms) only applies to mainframe guard (V,
Ω
GUARD banana
jack). Cable guard is always available at the Remote PreAmp, regardless of the guard setting.
Ohms guard is only available at the mainframe. On power-up, the mainframe defaults to cable
guard.
NOTE
When the guard selection is changed, the OUTPUT will turn OFF.
Front panel guard selection
Perform the following steps to check or change the guard selection:
1.
Press CONFIG and then the SOURCE V, SOURCE I, or
Ω
. Changing guard in one con-
figuration 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 connect ohms guard using coaxial cabling, or oscillations may occur.
Remote command guard selection
Use the :SYSTem:GUARd command in Section 17 to choose between cable and ohms guard
mode via remote. For example, send the following command to enable ohms guard:
:SYST:GUAR OHMS
Conversely, send this command to enable cable guard:
:SYST:GUAR CABL
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Summary of Contents for 6430
Page 26: ......
Page 32: ......
Page 78: ...2 14 Connections ...
Page 98: ...3 20 Basic Source Measure Operation ...
Page 138: ...5 30 Source Measure Concepts ...
Page 156: ...6 18 Range Digits Speed and Filters ...
Page 168: ...7 12 Relative and Math ...
Page 176: ...8 8 Data Store ...
Page 202: ...9 26 Sweep Operation ...
Page 248: ...11 22 Limit Testing ...
Page 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Page 418: ...17 108 SCPI Command Reference ...
Page 450: ...18 32 Performance Verification ...
Page 477: ...A Specifications ...
Page 489: ...B StatusandErrorMessages ...
Page 498: ...B 10 Status and Error Messages ...
Page 499: ...C DataFlow ...
Page 503: ...D IEEE 488BusOverview ...
Page 518: ...D 16 IEEE 488 Bus Overview ...
Page 519: ...E IEEE 488andSCPI ConformanceInformation ...
Page 523: ...F MeasurementConsiderations ...
Page 539: ...G GPIB488 1Protocol ...
Page 557: ......