12 • BX-245
© Box 73 Amateurfunkservice GmbH 2019
Master calibration
It is possible to permanently store SOL
calibration values for the entire measuring
range. The analyzer steps through the en-
tire frequency range with the
Short
cali-
bration
element
connected and stores the
measured values. The same process is re-
peated for the
Open
and the
Load ele-
ments
. It is recommended to perform the
Master Calibration once directly on either
the BNC connector, or at the end of a per-
manently connected cable or a permanent-
ly connected test setup as part of the ana-
lyzer commissioning process. Once
Master calibration has been performed
measurements can be made at any time
without new calibration.
This Master calibration function can be
accessed via
Operating mode
→
Setup
→
SOL All frequencies
(Fig. 15). Master cal-
ibration will be selected automatically
whenever the current calibration becomes
invalid.
Caution:
Prior to starting Master Calibra-
tion, do make sure that Cal/Port Model
Master data for Load, Short and Open (if
available) is entered first in Setup, other-
wise the Master Calibration will be invalid.
Note:
The Master Calibration process
takes about 20–25 minutes, but can be
cancelled if desired. In this case, however,
inconsistent reference values may arise, so
this calibration should be repeated at the
earliest opportunity.
Which calibration method is actually being
used can be seen on the display. Thus, the
master calibration is used in Fig. 16 for the
SWR measurement, recognizable by the
abbreviation M to the right of the bar
graph. After single-frequency calibration,
there would be a
C
here (for
Current SOL
),
whilst an uncalibrated measurement is in-
dicated as a
–
(dash character) at this point.
n
FA-VA5 menu system:
Use the left
button to enter the menu
mode (long 2-second button press). Then
there are choices according to Table 2
(Fig. 17 … 19). Within the menu, use the
and
buttons to move to the de-
sired point and then select it with the
button. A new submenu is indicated by a
small arrow > pointing to the right. The
current selection is inverse and slightly in-
dented.
The system contains three types of menu
items:
Measurement Modes
,
Functions
and
Setup
.
The desired Measurement – Operating
mode can always be selected immediately.
Fig. 15: Starting point of the master calibration
Fig. 16: Master calibration used in this mea-
surement
