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 color burst
contained in a composite video signal.
Other examples of arming can be found later
in this chapter, starting on page 5-9.
Start arming acts like an External Trigger
on an oscilloscope. It allows the start of the
ac- tual measurement to be synchronized to
an external 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 function, which delays the
actual start of measurement with respect to
the arming pulse, similar to a "delayed
timebase" in an oscilloscope.
You can choose to
delay start arming by a
preset 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
sampl
e.
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
measurement.
Stop arming can be used for all functions ex-
cept
Frequency Burst, Ratio, Volt and
Rise/Fall Time.
Stop Delay can only be used for realizing the
function Timed Totalize in the CNT-91(R).
5-3
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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