Technical data

Installation & Operation Manual GM-TTT
Page 57
4 Genlock
4.1 Genlock to a Black-Burst or Video Signal
• Connect a black-burst or CVBS video signal to BNC VIDEO/BB.
• At menu SET - ... - LOCK select bb and press enter button.
• Press genlock button.
The LED genlock lights up if genlock is operating normally. The LED flashes if the genlock
signal is disturbed and the internal reference is currently selected. If the genlock signal returns
to be ok the LED will light up again. The LTC output gets a frequency and phase adjustment to
this genlock source. The first transition of bit 0 of each frame occurs at line 5 in a 525/60
television system and at line 2 in a 625/50 television system.
GM-TTT permanently measures the timing of the genlock source. If the frequency does not fall
within the valid range, the unit switches to internal reference. For example at frame rate = 25
the unit does not accept a 525/60 television signal. Furthermore the unit adjusts its internal
reference to the genlock frequency, so in case of a failure the LTC output stays at the last
frequency and no disturbance of the output signal occurs. The current programming of the
internal reference is displayed at menu STATUS - ... - 3.
GM-TTT permanently supervises the genlock source. An error counter increments in case of
any faults, this counter is displayed at menu STATUS - ... - 4. Another error counter increments
in case of a failure, this counter is displayed at menu STATUS - ... - 5. Another error counter
increments in case of a disturbance, this counter is displayed at menu STATUS - ... - 6. The
error counters get an update each frame. Each time the genlock button is pressed the error
counters get a reset to zero.