Changing Perception makes paper redundant
Many test engineers using high-speed data acquisition tools believe that it is often easier to use a paper chart recorder to quickly evaluate test data rather than trying to examine the PC’s DAQ results.
But HBM Genesis HighSpeed has consigned that era to history with the introduction of its latest GEN series of DAQ products intended for a wide range of applications.
Many basic PC data acquisition systems are limited because the data throughput to the hard disk is precisely the same as the data output from the hard disk. This means that a 10-minute measurement made at full hard disk bandwidth requires 10 minutes to replay.
However, the GEN DAQ products have a patented feature called StatStream that solves this throughput problem. Using StatStream, several parallel, reduced data streams are produced in real-time during measurement and saved with the raw data.
If a 10 Gigabyte data set is displayed on the screen, this display is generated from a reduced data set. All statistical parameters, such as minimum and maximum values, are saved with the data to ensure that every interference spike, even if it is only one sample wide, is always displayed. By zooming in on the data, sub-data sets of increasing size are used until the raw data sets are finally displayed at the sample level.
During acquisition, the additional StatStream information is generated without performance degradation using special Digital Signal Processors (DSPs). The additional information increases the size of the data set by only 3 to 4% but replay is up to 1,000 times faster than with conventional PC systems; an 8 Gigabyte data set is displayed in only 3 secs.
The HBM Genesis HighSpeed GEN DAQ series also feature a ‘Review while Recording’ function that allows the products to simulate the functionality of a paper-based system. This enables evaluation and analysis of acquired data during the measurement and simulates an electronic version of the paper output.