Monarch Instrument Nova-Strobe PBL - Manual (Page 6)

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1.1.1 Internal Mode
The strobe is in the Internal Mode when nothing is plugged into
the input jack or when manually set using the INPUT button. In
the internal mode the strobe generates its own timing signals and
the users can enter the fl ash rate using several different methods
– see Section 3.1.
1.1.2 External Mode
In the External Input Mode the user can’t make any fl ash rate
adjustments with the knob. The fl ash rate is a function of the input
signal. This mode is used to synchronize the fl ash to an external
event (for example, from an optical sensor) to stop or freeze motion.
The fl ash will be triggered on the rising or falling edge (menu
selectable) of the external input pulse. The strobe is in the External
Input Mode whenever there is a plug in the input jack. When the
strobe is in the External Input Mode, EXT will be displayed.
When an external input is applied to the unit and the strobe is put
in the Tachometer Mode, the unit will read the signal from the
external input (sensor) and display the reading on the LCD display
without fl ashing the lamp. The strobe will not fl ash in the Tach
(Tachometer) Mode.
1.1.3 Charging Mode
The Charging Mode is when the strobe has the battery recharger
plugged into it. The strobe will continuously display the state of
the battery charge while being recharged.