User guide

User interface Main UI 45
− Rec Run: is currently without use as the camera cannot record
internally.
− Free Run: TC is running free in real time. Only possible if
sensor fps matches Project fps (=TC timebase)
• Counter:
− Regen: Rec Run TC is regenerated from the last valid recorded
TC value.
− Jam sync: Ext LTC can only be jam synced. This means that
the external TC source is connected to the camera, then the
camera read the external TC count and continues counting
on its own. Due to a highly precise crystal oscillator in
ALEXA, the internal counter will count accurately for 8 hours.
After that period, the camera has to be resynced to avoid any
TC offset.
Note: It is recommended to sync after every shooting break to avoid the risk of
having to resync during the shoot.
Note: the camera will keep its TC for about 10 minutes after disconnection from
the power source. If a power source is connected, the camera will remember its
TC for as long as the power source is connected, even if it is switched off.
• Dropframe: for non-integer time base settings 23.967 and 29.97,
TC is currently always counted as drop-frame TC.
• Timebase: the frame count of time code during one second. Can
be adjusted in the Menu: Menu>Project>Project fps.
• Userbit source: select the source of the user bits.
− Internal: User bits are set manually in the User Bit screen.
− LTC in TC: currently not supported.
− LTC in UB: currently not supported.
− System clock: currently not supported.
Press the SET TC screen button to adjust the TC counter (only with Int
TC as source). Reset it or match it to the system clock with the upper
screen buttons that appear during edit mode.
Press the USER BITS screen button to access the user Bits screen.
Figure 24: Timecode screen