Start Arming; Stop Arming - Fluke PM6690 Operator's Manual

Measurement Control
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.
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