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VXIbus Instrumentation for realtime ATE and Data Acquisition
VXI pcbased Data Acquisition and ATE Systems
Products ADC, DAC, Counter Timer, Transient Recorders, Frequency Counters, Signal Conditioning, Digital I/O, DSP bustec manufacturer ProDAQ VXI data acquisition hardware products
3451 Trigger Clock Function Card

ProDAQ 3451 trigger Function Card

  • Control/Synchronization for 3450 Transient Recorder Cards
  • Internal or External Sampling Clock
  • Input Signal Trigger Distribution from/to 3450 Transient Recorder Cards or External Trigger
  • Dual Timebase Operation with Internal Clock, Near/Far Post
  • Trigger Selection
  • Trigger Address Memory
  • "Between-Segments" Time Measurement
The ProDAQ 3451 Trigger Clock Function Card is designed to control and synchronize multiple ProDAQ 3450 Transient Recorder Function Cards. These cards can be located in the same ProDAQ Motherboard or spread across several motherboards. It operates either through the VXI backplane or optional external cables.

The ProDAQ 3451 Trigger/Clock Function Card can either generate an internal clock/trigger or receive an external clock/trigger. No matter what the clock/trigger source is, the TCFC sends it to all 3450 Transient Recorder Function Cards through either the VXI backplane or optional external cables. Using the VXI backplane to distribute clock and trigger to the different Transient Recorder Cards reduces the cable connections.

When using an on-board sampling clock the ProDAQ 3451 Trigger/Clock Function Card allows the dual timebase mode to be set. This means that the sampling clock rate can be changed during post-trigger phase to acquire the more interesting part of the waveform with high sampling frequency and the less interesting part of the waveform with low sampling frequency. The dual timebase mode is only available when working with internal clock and is disabled for external clock.

The dual timebase option enables the user to divide the post-trigger section into "near post-trigger" section and "far post-trigger" section. This allows the sampling frequency to be switched twice. The near post-trigger can be set from 8 samples to full post-trigger size.

The ProDAQ 3451 Trigger/Clock Function Card controls multiple segments data acquisition and measures time between segment triggers to allow reconstruction of waveform. The clock for that purpose can vary so that the time range can be easily extended. Each trigger-to-trigger timing measurement is then stored in the memory.

This feature allows the reconstruction of the global timing of the multiple waveforms stored in separate segments. The total range of time measurement depends on the chosen clock divider value and can vary from 14min to 1h 52min. The timing information is stored in a memory and can be read out after completion of the recording process. A dedicated register stores an overflow information about the second revolution of the tim-ing counter.

The ProDAQ 3451 Trigger Clock Function Card is supplied with VXIplug&play drivers, that can be used with all popular software packages. The driver automatically detects and initializes all the function cards installed in one of the ProDAQ motherboard modules, removing any possibility of configuration errors.

The ProDAQ modules allow the user to safely and simply expand their existing hardware and software systems.

Download the datasheet for the ProDAQ 3451 Function Card ...