8-12
IM 701830-01E
8.9
Zooming the Waveform
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For a description of this function, refer to page 1-17.
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Function
The instrument can display up to two zoom windows for each of waveforms selected for
display. You can set the zoom function on or off for each of the display waveforms. Note that
zooming cannot function on areas with less than 11 display points.
Zoom display mode (Mode)
Main
: Screen shows main (unzoomed) waveform(s) only.
Main&Z1
: Upper part of screen shows main waveform(s), while lower part of screen
shows zoom of the Z1 area.
Z1 only
: Screen shows zoom of Z1 area only.
Main&Z1&Z2 : Upper part of screen shows main waveform(s); lower left part shows Z1
zoom(s); lower right part shows Z2 zoom(s).
Z2 only
: Screen shows zoom of Z2 area only.
Z1&Z2
: Upper part of screen shows Z1 zoom (s), while lower part of screen shows
zoom of Z2 zoom (s).
Allocation
Use this parameter to select the waveform channels to be zoomed (CH1, ..., CH16, Math1, ...,
Math8). Note that you can set the value ON only if the corresponding channel display is also set
ON. If you set the Allocation to OFF, the screen will not show a zoom display for that channel.
Zoom Format
Selects the number of waveform windows on the display. Note that you cannot set separate
values for Z1 and Z2 displays. Select from any of six formats: Main*, Single, Dual, Triad,
Quad, Hexa or Octal.
* Selecting main results in the same format as the “
Main Format
” of
DISPLAY
key.
Zoom rate (magnification)
• The maximum available zoom depends on the displayed record length: [Maximum zoom =
displayed-record-length x 1/10].
Note that the “displayed record length” is not always identical to the “record length” in the
acquisition memory. For details, refer to Appendix 1.
• You can use different zoom rates for Z1 and Z2 windows.
Setting the zoom rate (Z1 Mag, Z2 Mag)
You can set the zoom rate in 1-2-5 time-axis steps. The value is displayed on the upper right
corner of the zoom waveform display frame.
Zoom positions (Z1 Position, Z2 Position)
• You set the zoom position (center of the Z1 or Z2 zoom slice) by its distance from the center
of the screen, in time-axis divisions. The setting range is {-5div, ..., +5div}. The setting step
is: {T/div x 10
÷
displayed-record-length}.
• The Z1 zoom slice (also called “zoom box”) is indicated by solid vertical lines drawn through
the main waveform(s). The Z2 box is indicated by dashed lines. You can change the positions
independently. If the mode is Main&Z1&Z2, making the jog shuttle marks of both “Z1
Position” and “Z2 Position” soft keys white (
) allows you to move the zoom position
without changing the distance between Z1 and Z2.
• If the mode is Main&Z1&Z2, the main waveform area will show both the Z1 and Z2 boxes.
• The T/div setting during the roll mode display may sometimes be inadequate for observing
the changes in the waveform on the main area. In this case, open a zoom window (for
example, Main&Z1) and set the zoom position to the right edge. The zoom area will show
the most recent waveform zoomed and the changes in the waveform can be observed. If the
waveform acquisition is stopped before the waveform reaches the right edge of the main area
in this condition, the waveform may disappear from the zoom area. However, if you move
the zoom box to the position where there are waveforms in the main area, the waveform
reappears.
Display position of original waveforms : Main Position
If the record length is 2 MW or more (the maximum record length that can be displayed is 1
MW) or if the display record length is shorter than the set record length, there are data outside
the display screen. To observe the data which is outside the display screen, move the display
position horizontally with “Main Position.” It can be set in units of 0.001 % with the left most
data acquired in the acquisition memory to be 0 %.
Zoom display during roll mode
Set the zoom box
to the right edge.
The most recent waveform
is displayed zoomed.
The waveform disappears
from the screen.
Stop the waveform acquisition
before the waveform reaches
the right edge.
Move the zoom box.
The waveform
reappears.
