Product category: Sensors and Data Acquisition
News Release from: Dataquest Solutions | Subject: Spectrum
Edited by the Electronicstalk Editorial Team on 18 March 2005
Speedy digitisers know the real time
Trigger controlled data acquisition is a very useful way of controlling signal capture, particularly at very high sample rates
It provides an automatic method to the isolation and analysis of important events, where often these events sit in a less important background signal. The question however is how to find an effective method of recording when and how often a valid trigger event arrives. The Spectrum range of high and ultra-high-speed digitisers have a time stamp module option especially designed for this purpose.
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The Spectrum M2i.46xx series of 16bit data acquisition boards features sample rates to 3Msample/s and up to eight input channels
This piggybacks onto almost all the PCI and compact PCI range and has a FIFO memory attached allowing up to 64 thousand time stamps to be stored for later retrieval.
Also this storage produces no overheads on the capture rate of the board.
Each timestamp has a resolution equal to the sample rate, so not matter how fast the capture board is running the exact time is available.
Further reading
PXI instruments answer production test demands
A dedicated PXI chassis with all the computer processing built in can provide a particularly dependable test package for the manufacturing environment
An optional connector also allows direct injection of this clock signal from a radio clock card or GPS unit.
The former is often used to precisely synchronise a PC clock time to an atomic clock signal from transmitters around the world, such as that at Rugby UK.
Three modes are available for the module operation.
Standard, StartReset and Refclock.
It is the Refclclock that can operate with the radio or GPS clock, but the other modes also provide further flexibility allowing the user to determine his own zero start point, or to automatically start as soon as the board starts recording data.
These modes can also be combined with other useful options such as multiple recording, which allows multiple triggers to be recognised even if only a few samples apart, or gated triggering, where signal recording which can be stopped and started over user definable and variable periods of time relative to programmed voltage levels for greater capture control.
The time stamp module provides a start and stop time for each gate period.
Useful application areas include radar, sonar, spectroscopy, spectrophotometers, RF, laser pulse, ultrasound and more.
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