Profoto B1 500 AirTTL User Manual page 13

Wrong exposure alarm
When a flash is released before the unit is ready, there will be a long beep and the display
will blink. These signals indicate that the flash light does not fully correspond to the set
value. The B1 will always continue to flash even if the set light output cannot be met as the
image may still be usable if the catch of the moment was perfect.
The sound alarm is partially deactivated when BEEP is deactivated. If BEEP is deactivated
the sound alarm will only go off if B1 is used in TTL operation and cannot keep up with the
camera in sequence shooting.
Quick burst
Quick burst is an automatically activated function that allows a series (burst) of flashes to
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be fired at a faster pace than the B1 can recharge, without losing light output. The function
is only active when the light output is set to less than full. The length of the burst, in number
of flashes, depends on the repetition rate and the set light output. The lower the light output
is set, the longer bursts can be triggered. Thanks to this feature, the B1 can trigger up to 20
flashes per second on lower power output without triggering the "Wrong exposure alarm".
Note that the accuracy of the light output is slightly less precise when Quick burst is active.
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