Configuring external pre-trigger input

You can supply RVP10 with your own CMOS-level pre-trigger for installations in which adequate trigger control already exists.

  1. In the softplane.conf file, configure the trigger input.

    The trigger input is provided on the IFDR10 TRIG-A or TRIG-B SMA connector J8 and J15, or on a TTL or RS-422 I/O line on J3 or J6.

    The trigger input threshold is 1.3 V and can tolerate a 5 V maximum input when DC coupled. If AC coupled and 50 Ω terminated, it can take a -6 ... 8 dBm input signal. This makes it easier to connect to existing high-voltage trigger distribution systems. The rising or falling edge of this external trigger signal is interpreted by RVP10 as the pretrigger point. The pulse width of the signal does not matter.

  2. Configure the delay to range0 in the TTY Setups.

    See Mt<n> — Transmit sequence #n.

  3. Synchronize the other trigger outputs to the input trigger.

    The synchronization jitter between the user pretrigger and the other trigger outputs are less than the period of the A/D sampling clock, for example, 10 nanoseconds at a 100 MHz rate.