Fluke PM6690 - Page 26

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Settings
This key accesses a host of menus that affect
the measurement. The figure above is valid af
-
ter changing the default measuring time to
10 ms.
Meas Time
This value input menu is active if you select a
frequency function. Longer measuring time
means fewer measurements per second and
gives higher resolution.
Burst
This settings menu is active if the selected
measurement function is BURST – a special
case of FREQUENCY – and facilitates mea
-
surements on pulse-modulated signals. Both
the carrier frequency and the modulating fre
-
quency – the pulse repetition frequency (PRF)
– can be measured, often without the support
of an external arming signal.
Arm
Arming is the general term used for the means
to control the actual start/stop of a measure
-
ment. The normal free-running mode is inhib
-
ited and triggering takes place when certain
pretrigger conditions are fulfilled.
The signal or signals used for initiating the
arming can be applied to three channels (A, B,
E), and the start channel can be different from
the stop channel. All conditions can be set via
the menu below.
Trigger Hold-Off
A value input menu is opened where you can
set the delay during which the stop trigger
conditions are ignored after the measurement
start. A typical use is to clean up signals gen
-
erated by bouncing relay contacts.
Statistics
Using the Controls
2-10 Description of Keys
Fig. 2-12 Setting arming conditions.
Fig. 2-13 The trigger hold-off submenu.
Fig. 2-14 Entering statistics parameters.
Fig. 2-11 Entering burst parameters.
Fig. 2-10 Submenu for entering measur-
ing time.
Fig. 2-9 The main settings menu.