8-19
IM 701510-01E
Analyzing W
aveforms
8
8.7
Measuring the Power Spectrum using Cursors
1.
Display the power spectrum. For details, refer to the previous page.
2.
Press the
CURSOR key
to display the cursor measurement setting
menu.
3.
Press the “
Cursor
” soft key and select “
ON
”.
4.
After having pressed any of the “
F1
”, “
F2
” or “
F1&F2
” soft keys, use
the rotary knob to adjust the position of the vertical cursor. You may
also use the
<
or
>
key.
Explanation
Waveforms which can be measured
Waveforms which can be measured are the same on which FFT computation can be
performed. Refer to the previous page for more details.
Measurement items
The following items can be measured.
F1(X)
Frequency at the position of cursor F1.
F2(X)
Frequency at the position of cursor F2.
DF(X)
F2–F1
P1(X)
Frequency level at the position of cursor F1.
P2(X)
Frequency level at the position of cursor F2.
DP(X)
P2–P1
(X) indicates the waveform of measurement.
Cursor movement method
The cursors can be selected as follows.
F1
Moves cursor F1 only.
F2
Moves cursor F2 only.
F1&F2
Moves both cursors F1 and F2 simultaneously without changing the distance
between them.
Cursor movement range
Each vertical cursor can be moved to 501 different positions from the left edge (–5.00 div)
to the right edge (5.00 div) of the waveform display frame. However, there is no data at the
501 position of the rigth edge. Thus, when you move the cursor to this position, the display
will show “- - -”
The default setting is –2.50 div for T1 and 2.50 div for T2.
Points to note when performing cursor measurements
• The cursors and measured values will still be displayed even if a different menu is
selected. However, the cursors cannot then be moved.
• Cursor-measured values will be cleared if the automated measurement function is turned
ON. However, pressing the CURSOR key (when “Cursor” is set to “ON”) will display
the cursor-measured values.
• If the GO/NO-GO “Mode” has been set to “ON” and the “GO/NOGO EXEC” soft key
has been pressed, the cursor measurement function will not operate even if the CURSOR
key is pressed. To operate the cursor measurement function, the GO/NO-GO “Mode”
must be set to “OFF”.
• If measurement is not possible, “- - -” will be displayed.
• Cursor measurement is also possible for expanded waveforms. When switching the
display to show the expanded waveform, the position of the cursor on the screen does not
change. When both the pre-zoom and the expanded waveform are displayed, cursor
measurement will be performed on the expanded waveform.
• There might be cases where the displayed waveform is not in synchronization with the
measurement values. To synchronize, stop data acquistion.
Keys and Procedure
CURSOR key
Rotary knob
Soft keys
<, > keys
F1 cursor
F2 cursor
