Frequently Asked Questions

General Questions Questions Related to Specific Gage Products Can't Find an Answer?

Q. Is there a programmable trigger delay on the CompuScope 250 (or other CompuScope cards)?

A. Yes, it is possible to have a programmable trigger delay on all CompuScope cards. The CompuScope 250 has an on-board counter which counts how many points are to be captured after a trigger event, e.g. 64, 128, 192, ..., 16384, ..., 32768, ..., 1048576, and so on, up to 4 million samples with a 64 point resolution, i.e. 640 ns at 100 MS/s rate.

In other words, at the 100 MS/s sample rate, this counter can provide you a programmable delay of:

  4,000,000 * 10 ns = 40,000,000 ns = 40 milliseconds

The following is how such a data capture would take place:

The TRIGGER ADDRESS returned by the board will be the first point of the "snap-shot" and the point preceding it will be the last (the memory is arranged as a circular buffer). As the memory is SRAM based (Random Access Memory), you can go in and read out any portion of the memory, i.e. the resolution of the Trigger Delay is one sample point which is 10 nanoseconds.

Another way of looking at this arrangement is that the Trigger Delay counter provides you the "coarse" setting of the delay and your selection of the memory address provides the "fine" setting.

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