Frequency Converter - Basler Racer User Manual

AW00118508000

6.5 Frequency Converter

The camera is equipped with a frequency converter module that allows triggering the camera at a
frequency that differs from the frequency of the input signals received.
The frequency converter module includes three sub-modules acting in sequence on the original
signals:
The pre-divider module receives the input signals. The module allows employing an integer

factor, the pre-divider, to decrease the original frequencies and passes the signals on to the
next module, the multiplier module.
If for example a pre-divider of 2 is selected only every other input signal is passed out un-
changed to the multiplier module and, accordingly, the frequency is halved. If a pre-divider of 1
is selected every input signal is passed out unchanged to the multiplier module.
Employing the pre-divider may be advisable for decreasing periodic jitter of the input signals and
will be required if the input signal frequency is higher than 100 kHz. The signal frequency of the
signals passed on to the multiplier module must be within the range of 10 Hz to 100 kHz.
Basler recommends to only use low values for the pre-divider. The original signal frequency
should be changed as little as possible to facilitate frequency adjustment by the multiplier mod-
ule.
The multiplier module receives the signals from the pre-divider module. The signal frequency

must be within the range of 10 Hz to 100 kHz. The multiplier module allows applying an integer
factor, the multiplier, to generate signals at increased frequencies and passes the signals on to
the next module, the post-divider module.
If, for example, a multiplier of 2 is selected signals are generated at double the frequency of the
signals received from the pre-divider module and are passed on to the divider module. If a mul-
tiplier of 1 is selected every signal received from the pre-divider module is passed unchanged
on to the divider module.
The Align parameter can be set to RisingEdge and FallingEdge. If RisingEdge is selected there
will be for the rising edge of each signal received from the pre-divider module a phase-locked,
matching rising edge among the signals generated. If FallingEdge is selected there will be for
the falling edge of each signal received from the pre-divider module a phase-locked, matching
falling edge among the signals generated.
Make sure to select a multiplier that will not too much increase the frequency such that the cam-
era will be overtriggered. Temporarily, a too high frequency can occur during frequency adjust-
ment causing overtriggering even if a relatively low multiplier was selected. Basler recommends
to use one of the safeguards against overtriggering the camera:
Set the PreventOvertrigger parameter to True if you use Basler pylon for camera

configuration.
Set the Frequency Converter Prevent Overtrigger register to 1 if you use direct register

access for camera configuration.
The PreventOvertrigger parameter provides a safeguard against overtriggering the camera.
Basler recommends setting the PreventOvertrigger parameter to True to prevent overtriggering.
The post-divider module receives the signals from the multiplier module. The post-divider

module allows employing an integer factor, the post-divider, to generate signals at decreased
frequencies and provides these signals to be used as camera trigger signals, e.g. as line start
triggers.
Basler racer Camera Link
Acquisition Control
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