Arming is somewhat complicated yet gives
the flexibility to perform a measurement on a
specific portion of a complex signal, like a
frequency measurement on the colorburst con
-
tained in a composite video signal.
Other examples of arming can be found later
in this chapter, starting on page 5-9.
Start Arming
Start arming acts like an ExternalTrigger on
an oscilloscope. It allows the start of the ac
-
tual measurement to be synchronized to an ex
-
ternal trigger event.
In a complex signal, you may want to select a
certain part to perform measurements on. For
this purpose, there is an arming delay func-
tion, which delays the actual start of measure-
ment with respect to the arming pulse, similar
to a “delayed timebase” in an oscilloscope.
You can choose to delay start arming by a pre-
set time.
Start arming can be used for all functions ex-
cept Frequency Burst, Ratio and Volt.If
you use start arming to arm an average mea-
surement, it only controls the start of the first
sample.
Stop Arming
Stop arming prevents the stop of a measure
-
ment until the counter detects a level shift on
the arming input. Combining Start and Stop
Arming results in an “external gate” function
which determines the duration of the measure
-
ment.
Stop arming can be used for all functions ex
-
cept Frequency Burst, Ratio, Volt and
Rise/Fall Time.
About This Chapter 5-3
Measurement Control
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