2-3
IM 701210-05E
Explanation of Functions
2
2.2
Setting the Horizontal and Vertical Axes
Horizontal Axis <Section 4.2>
Setting the Time Axis
When using the internal clock
1
, the time axis is set in terms of the time per one grid
square (1 div). The selectable range is 500 ns/div to 30 s/div, 1 min/div to 30 min/div, 1
hour/div to 12 hour/div, and 1 day/div to 3 day/div. The transition between seconds,
minutes, hours, and day is automatically performed. Since the display span along the
horizontal axis is 10 divisions, the time span of the displayed waveform is equal to “the
time axis setting
×
10.”
1 div = 500
µ
s
10 div
1 div = 1 ms
1. Internal clock and external clock (time base selection)
Under the initial setting, the sampling timing of waveform data is controlled by the clock signal
generated from the time base circuit within the DL750/DL750P (see section 1.3).
The timing can also be controlled by a clock signal applied externally. External clock signals
are input through the external clock input terminal on the left panel facing the DL750/DL750P.
This external clock input is useful for observing a signal whose period varies or for observing
waveforms by synchronizing to the clock signal of the signal being measured.
Display in the Time Axis Direction
There are 10 divisions along the time axis, and 1001 points (logical number of points, not
the dots on the screen) are used to draw the waveforms. Therefore, if the display record
length (see page 2-31) is exactly 1 kW (the number of acquired data points is 1001), the
waveform is displayed using 1001 points. However, if the display record length is
greater than or equal to 2 kW, the maxim and minimum values are determined (P-P
compression) and aligned at the same time position (total number of points: 2002) to
draw the waveform.
1001 points
1
0
1000
Sampled data
Time Axis
Record length
Record length
<P-P compression display>
Maximum value
Minimum value
1. 1001 points is a logical number
of points. On the screen the
data is compressed to 651 dots
(751 dots when the zoom waveform
area is expanded) and displayed.
Vertical axis