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Front Panel Operation
Calibrating the Time Base of an Oscilloscope
4
4-25
4-38.
The Time Marker
The Time MARKER function, which is available through the MARKER menu, lets you
calibrate the timing response of your oscilloscope. To access the MARKER menu, press
w
or the softkey under MODE until “marker” appears.
SHAPE
spike
TRIG
off
MODE
marker
f
f
f
f
f
sine
spike
square
sq20%
off
/1
/10
/100
volt
edge
levsine
marker
wavegen
video
pulse
meas Z
overld
auxin
The following describes each option in the MARKER menu:
•
SHAPE
Selects the marker waveform. Depending on frequency setting, possible
selections are sine, spike, square (50 % duty cycle square wave), and sq20% (20 %
duty cycle square wave.) Note that selections available under
SHAPE
depend on the
selected marker period (frequency), as follows:
Selection
Period (Frequency)
sine
10 ns - 2 ns (100 MHz - 500 MHz)
spike
5s - 20 ns (0.2 Hz - 50 MHz)
square
5s - 10 ns (0.2 Hz - 100 MHz)
sq20%
20 ms - 100 ns (50 kHz - 10 MHz)
•
TRIG
If you are using the external trigger, use this key to cycle through the trigger
settings. The available trigger settings are: off, /1 (trigger signal appears on each
marker), /10 (trigger signal appears on every tenth marker), and /100 (trigger signal
appears at every 100th marker). If you have the 5-channel option, you must select
which connector to use for the external trigger and the channel connector for the
output.
•
MODE
Indicates you are in “marker” mode. Use the softkey to change modes and
open menus for other oscilloscope calibration modes.
Default marker values are 1.000 ms, SHAPE = spike.
The
u
and
a
keys step the voltages through cardinal point values of an
oscilloscope in a 1-2-5 step sequence. For example, if the period is 1.000 ms, pressing
u
increases the period to the nearest cardinal point, which is 2.000 ms. Pressing
a
decreases the voltage to the nearest cardinal point, which is 500
µ
s.
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