Fluke 105 Series II, Руководство пользователя

Страница: 89 / 221

Using the Scope Mode 5 - 13
Selecting a Trigger Level
Press to open the ADJUST LEVEL box. If you have
selected INPUT A or INPUT B as the trigger source, you
can use
and to adjust the trigger level
continuously. Observe the level changes in the display.
Press
to select.
The trigger level is identified by the trigger icon (e.g., )
on the left of the display.
Selecting Auto Level
Press to find the optimal trigger level for the source
waveform voltage.
Choosing a Trigger Delay
You can also begin to display the waveform at some time
before or after the trigger point is detected. This is
identified by the delay icon "T" on the top of the display.
From the second page of the MORE TRIGGER window,
select RESET DELAY to reset all the selected trigger
delays to their initial values (TIME DELAY : -2, TRIGGER
SPECIAL DELAY: OFF).
Types of trigger delays are discussed below. In many
instances, you can select more than one type of delay.
Press to enter the Time Delay list box. Use or
to set the trigger time delay in increments of the
existing time base divisions. The range of divisions is -20 to
+640. For example, if the time base is set to 2ms/DIV, +16
defines a delay of 16 time divisions (32 milliseconds) after
the trigger is detected. Press
to select.
From the second page of the MORE TRIGGER window,
select TRIGGER SPECIAL DELAY (off, Events, or
N-Cycle).
N-CYCLE The trigger waveform is divided by the
number of cycles "N" to create a stable picture for
waveforms with a cyclic character. (N-CYCLE can be used
only on INPUT A.) Use
or to select the number
of cycles. A total of +2 to +255 cycles can be selected.
EVENTS Triggering via the external input is delayed
for a number of events that occur on INPUT A. Use or
to select the number of events (+1 to +1023).
External trigger starts the delay, and after the number of
events on INPUT A is equal to the selected number, the
test tool acquires the INPUT A signal.