Promax MC-577 Manual De Instrucciones página 63

USER'S MANUAL MC-577.
Figure 5.- Spectrum analyser mode, MAX mode.
The monitor will show a representation of the signals present in the band in function
of each frequency. The vertical axis corresponds to the frequency, the higher
frequencies being higher up on the screen and the lower ones further down. The
horizontal axis represents the level of the signals present in the band, the amplitude of
the lobes appearing on the screen represent the energy of the various signals present
in the band.
The bandwidth shown can correspond to the entire selected band (MAX mode) with
the SPAN/MAX key [6] released, or a smaller margin close to the current tuning
frequency (SPAN mode) with the SPAN/MAX key [6] pressed, then acting on the SPAN
control [24] in order to select the bandwidth to be shown, this may be chosen between
approximately 1/3 of the band (depending on the width of each band, to maintain the
power calibration) and a bandwidth of almost zero.
Having chosen a specific bandwidth, you may now vary the tuning with the TUNING
control [25] to gradually sweep the entire band of selected frequencies. The frequency
counter will show the tuned frequency.
In the complete band Spectrum Analyser mode (MAX, with the SPAN/MAX key [6]
released) a white horizontal line will appear on the monitor (tuning mark) showing the
tuning frequency (as can be seen in the previous figure). As you move across the
frequencies with the TUNING control [25] you will see the mark move across the entire
spectrum, allowing you to approximately pre-tune the frequency corresponding to the
lobe that the mark is on.
IN THE MAX REPRESENTATION MODE, THE TUNING FREQUENCY READING ON
THE FREQUENCY COUNTER DISPLAY [23] IS DEACTIVATED.
When obtaining the levels of different signals, you will find a set of continuous
vertical lines on the image, together with others in the form of points, forming a grid
which corresponds to divisions of 10 and 5 dB respectively, depending on the scales
[33] or [34] found along the top of the monitor [1]. See section (4.2.6 Taking
measurements).
05/2003
IMPORTANT
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