Basler raL2048-48gm User Manual download pdf (Page 159)

AW00118302000 Acquisition Control

Basler racer GigE 149

8.7 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 module can accept input signals from one of the three input lines or signals (ticks) from the shaft

encoder module.

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. Peri-

odic jitter is likely to be present when input signals from the shaft encoder are accepted.

We recommend 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 module.

 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 "rising edge" and "falling edge". If "rising edge" 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 "falling edge" 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 may occur during frequency adjust-

ment causing overtriggering even if a relatively low multiplier was selected. The

PreventOvertrigger parameter provides a safeguard against overtriggering the camera.

We recommend 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.

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Basler raL2048-48gm User Manual Page 159

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