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   Dynamic Measurements, Inc.

                                   MATLAB® based Data Acquisition Software for VXI Hardware
 

Acq_Mat1432  has the following Time Measurements capabilities:

  • N Channels, limited only by VXI hardware configuration.

  • Choose the Number of Active Channels from 2, 4, 6, 8, 10, 12, 14, 16 ... to N Channels in even numbers.

  • Import Excel files with channel parameters like EU sensitivity, EU,  ID #, Transducer Model Number and Serial Number.

  • >2 MSamples /Sec simultaneous, contiguous Real Time to Host Disk Files (See table below)

  • Throughput to Host RAM somewhat faster than Host Disk, limited by RAM size.

  • Perform Throughput to the VT2216 SCSI Module at  > 5 MSamples /sec, sustained

  • Display 2, 4, 8 or 16 traces while measurement running.

  • During the measurement, Display Time data only or choose either Time + Linear Spectra or Time + Averaged Spectra.

  • Use VT1432, VT1435 or VT1436 at up to 102.4k Samples /Sec /Channel.

  • Use VT1433 at up to 196kSamples /Sec /Channel.

  • Auto Range: UP Range only or UP & Down Range in Time Measurement.

  • Block or Continuous Mode acquisition.

  • Block Sizes: 64 to 8192.

  • Frequency Spans: All those supported by VT1432/VT1433/VT1434/VT1436

  • Save all scans of all channels or just the last scan.

  • Choose Auto Save Data with incrementing File Name.

  • Also choose SDF format as additional data format type

  • Also saved with the data are any overloads that occurred on any channel during any scan.

  • All data attributes are saved with the data, I.E. Sensitivity, Eng. Units, Range, Coupling, ID, etc

Acq_Mat1432 - Throughput to Host Disk

General Summary:

For Aggregate Sample Rates of 819,200 Samples/Sec (or Lower) and a BlockSize of 8192 Throughput to Host Disk will be limited only by the size of the Host Disk

Note: These benchmarks are Host / Disk dependent !   Windows 7 (32 bit or 64 bit) with faster disks shows improved performance.

 

Benchmark Host:

3GHz Pentium4, 2 GB RAM (PC3200), SATA 120GB 7200 RPM Disc Drive 800 MHz FrontSide Bus, WinXP Pro SP1, No Data Display, No Overloads, Periodic Log Swept Sine, Source - On

Update Note:

With Windows Vista(32 bit), Intel Core 2 Duo Processor, 2 GB RAM, SATA 10,000  RPM Drive, the performance is approximately 25% better using the 8192 Blocksize and falls below the following benchmarks for smaller Blocksizes. Also note the current disk drives are more than an order of magnitude larger than the above benchmark.

Performance Benchmark

Channels Samples per
Sec / Ch  *		 Aggregate Rate
Samples/Sec *		 BlockSize Max Scans Total Time
Seconds		 Total Samples MATLAB File
Size Bytes **
3-1433
24 196,608 4,718,592 8192 319 13.29 62,717,953 501,743,616
24 196,608 4,718,592 4096 612 12.75 60,162,048 481,296,384
24 196,608 4,718,592 2048 1162 12.1 57,114,624 456,916,992
2-1433
16 196,608 3,145,728 8192 360 15.00 47,185,920 377,487,360
15 196,608 3,145,728 4096 692 14.42 45,350,912 362,807,296
16 196,608 3,145,728 2048 1226 12.77 40,173,568 321,388,544
1-1433              
8 196,608 1,753,864 8192 542 22.58 35,520,512 284,164,096
8 196,608 1,753,864 4096 907 18.90 29,720,576 237,764,608
8 196,608 1,753,864 2048 1314 13.69 21,528,576 172,228,608
2-1432, 3-1433              
56 51,200 2,867,200 8192 193 30.88 88,539,136 708,313,088
 56 51,200 2,867,200 4096 374 29.92 85,786,624 686,292,992
56 51,200 2,867,200 2048 664 26.56 76,152,832 609,222,656
2-1432, 1-1433              
40 51,200 2,048,000 8192 224 35.84 73,400,320 587,202,560
40 51,200 2,048,000 4096 414 33.12 67,829,760 542,638,080
40 51,200 2,048,000 2048 687 27.48 56,279,040 450,232,320
2-1432              
32 51,200 1,638,400 8192 271 43.36 56,279,040 568,328,192
32 51,200 1,638,400 4096 467 37.36 71,041,024 489,684,992
32 51,200 1,638,400 2048 747 29.88 48,955,392 391,643,136
1-1432,1-1433              
24 51,200 1,228,800 8192 591 94.56 116,195,328 929,562,624
24 51,200 1,228,800 4096 698 55.84 68,616,192 548,929,536
24 51,200 1,228,800 2048 889 35.56 43,696,128 349,569,024
1-1432, 1-1433              
24 25,600 614,400 8192 Disk Limit Disk Limit Disk Limit Disk Limit
24 25,600 614,400 4096 Disk Limit Disk Limit Disk Limit Disk Limit
24 25,600 614,400 2048 Disk Limit Disk Limit Disk Limit Disk Limit
1-1432                
16 51,200 819,200 8192 Disk Limit Disk Limit Disk Limit Disk Limit
16 51,200 819,200 4096 Disk Limit Disk Limit Disk Limit Disk Limit
16 51,200 819,200 2048 1416 56.64 46,399,488 371,195,904
1-1432              
16 25,600 409,600 8192 Disk Limit Disk Limit Disk Limit Disk Limit
16 25,600 409,600 4096 Disk Limit Disk Limit Disk Limit Disk Limit
16 25,600 409,600 2048 Disk Limit Disk Limit Disk Limit Disk Limit
1-1433              
8 51,200 409,600 8192 Disk Limit Disk Limit Disk Limit Disk Limit
8 51,200 409,600 4096 Disk Limit Disk Limit Disk Limit Disk Limit
8 51,200 409,600 2048 6594 263.76 46,399,488 864,288,768
1-1433              
8 25,600 204,800 8192 Disk Limit Disk Limit Disk Limit Disk Limit
8 25,600 204,800 4096 Disk Limit Disk Limit Disk Limit Disk Limit
8 25,600 204,800 2048 Disk Limit Disk Limit Disk Limit Disk Limit
               

General Notes:

 *   NOTE:   Each Sample is 16 bits (or 2 Bytes / Sample from a H/W perspective)

**   NOTE:   MATLAB Data  Format is " Floating Point Double" (or 8 Bytes per Sample)

     NOTE:   Disk Limit = Contiguous Data Samples limited only by the size of available Host Disk Space


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