Specifications

The RF cable connections will be dependent on the type of calibration
being done and on the port assignments. By default, the connections
are done as follows:
AutoCal Port X to VNMS Port 1
AutoCal Port A to VNMS Port 2
AutoCal Port B to VNMS Port 3 (used for 3 or 4-Port calibrations)
AutoCal Port C to VNMS Port 4 (used only for 4-Port calibrations)
Only some of these port combinations may be used witha2or3-Port
VNMS. If a reflection-only cal is being performed, then only one port
combination is required. If a port is not being used (on either the
VNMS or AutoCal module), nothing needs to be connected to the open
port.
Additional port assignments may be possible. Consult the help screens
on the instrument or the latest application notes/application guide for
details.
4-Port AutoCal Operation
When power is first applied, the POWER LED on the AutoCal module
will illuminate. The OPERATE LED will only come on after the
module has warmed up (typically 2-5 minutes). DO NOT perform an
auto calibration (or characterization or assurance) until the OPERATE
LED is on.
The characterization file for the AutoCal module must first be loaded.
This typically comes on a floppy from the factory. The characterization
file may be loaded from:
Save-Recall/Recall/AutoCal Characterization.
Once connected (and the OPERATE LED is illuminated), the
calibration can be started by proceeding to the calibration menu and
selecting AutoCal and the appropriate calibration type. The number
of averages may be adjusted if necessary (see specifications section for
definitions), but the default values are usually adequate. Isolation
averaging may also be selected here or the isolation step may be
omitted (this is the default). Note the port assignment on these
menus/help screens to be sure the module is connected correctly. When
prompted, hit ENTER and the various standards within the module
will be sequentially measured and the calibration coefficients
computed. For more information on the calibration computation
process, consult the application notes Three and Four Port
S-parameters and AutoCal. Once completed, the calibration can be
saved to hard disk or floppy disk for later recall.
4-PORT AUTOCAL AUTOCAL
9-14 MS462XX OM