12 • BX-240
© Box 73 Amateurfunkservice GmbH 2017
Single frequency impedance
measurement
Displayed are the actual measurement fre-
quency (
freq.
) the complex impedance af-
ter effective resistance and reactance, the
total impedance resistance (
|Z|
), the corre-
sponding Inductance/Capacitance of the
test object, the SWR and the currently
used reference values of the SOL compen-
sation (see paragraph
Calibration
).
With regards to the SOL compensation,
the sections on
individual frequency SWR
measurement apply (Figs. 19, 21).
Single SWR measurement run
All multi frequency measurements have
three different modes which are indicated
by a symbol in the upper left corner of the
display.
1.
<
(small sign):
overview and adjust-
ment of the central frequency. The SWR
is displayed above the frequency. In ad-
dition a small rectangle indicates the
marker position (see Mode
M
). The
central vertical line corresponds to the
centre of frequency (here 7950 kHz).
The operational range extends both left
and right according to the selected fre-
quency range (here + or 3200 kHz). Us-
ing the middle and right buttons the
centre frequency can be increased or de-
creased by some 100 kHz. At the same
time, each button press triggers a new
measurement cycle over the defined fre-
quency range.
2.
>
(large sign):
overview, marker val-
ues and frequency range selection. The
SWR is again shown above the frequen-
cy. Additionally the small rectangle on
the SWR curve indicates the position of
the marker (see Mode
M
). Using the
middle and right buttons the frequency
range may be increased or decreased by
a factor of two (within the available fre-
quency/measurement range). At the same
time, at each button press a new mea-
surement cycle over the defined frequen-
cy range is started. The measured value
of the marker frequency is shown in the
bottom right hand corner of the display.
3.
M
(Marker sign):
View and adjust the
marker values over the previous fre-
quency range. The selected frequency
of the marker and the corresponding
SWR are displayed (without boundary
value limitations). The marker itself is
again represented by a small rectangle
on the SWR curve. Using the middle
and right buttons the marker can now
be moved along the previously mea-
sured curve in a total of 100 steps. In
Fig. 19: Single frequency impedance mea-
surement
Fig. 20: Single run of impedance measure-
ment
