This converter imports the Hewlett-Packard MSD raw format files. The HP raw data may be DATA.MS files from the DOS ChemStation or *.D files from the PAWS workstation. If the data files reside on a PAWS workstation, they must be transferred from the PAWS system over to a PC before conversion into GRAMS/AI format. There are a variety of tools for PAWS-to-PC File Transfers available from other vendors. See the Hewlett-Packard File Transfer Utilities section in this document or contact Thermo Electron for more information.
This converter also supports data collected from HP MS systems using RTE controllers. However, these files must first be converted to the MSD ChemStation format, and then transferred to the PC. The Hewlett-Packard utility program "RTECS" can convert the file to the ChemStation format on the RTE. The converted files are then transferred to the PC using the Hewlett-Packard "Advance Link" utility program. For more complete information, contact Hewlett-Packard or Thermo Scientific.
The default file extension is *.MS. A *.CGM total ion chromatogram file and a *.SPC multifile will be created for each MSD file imported. The HP_MSD32 converter stores the spectral data in full 32 bit precision GRAMS/AI data files. The HP_MSD16 converter writes the spectral data using 16 bit precision. The 16-bit Y value data files will sacrifice a little precision in the Y values, but the file size is 35-45% smaller, thus saving valuable disk space. The converter creates two files: (1) contains the Mass Spectra in an XYXY type file, (2) contains the total ion chromatogram in a separate *.CGM file with the first 8 characters match the original name.
This converter does not support export.
Note that the GRAMS/AI SPC multifiles created by this converter are a special Mass Spectrum XYXY type. This is due to the fact that HP only stores the ion peaks above a preset threshold in each spectrum, giving every spectrum a different number of data points. These files are not compatible with Thermo Scientific's Lab Calc software. Not only are these in GRAMS-ONLY format, but most of the Array Basic multifile manipulation programs (SMOOTH, DERIVATIVE, BASELINE, etc.) will NOT work properly on this type of data. There is an Array Basic program called MS2SPC.AB (available from Thermo Electron upon request) which will read the XYXY file and create a standard GRAMS/AI multifile. It does this by forcing all data points to be at integer M/z values and putting zeros (0's) in locations where there are not mass peaks. This allows most Array Basic multifile operations to be performed on the mass spectra but expands the file size significantly. In addition, there are also options in the program for creating the new multifiles with even-Z axes. This allows the extracted CGMs to be manipulated by Array Basic. (Standard MSD files have ordered-Z axes. Extracted CGMs from ordered-Z multifiles are XY type, so that Array Basic applications won't work with them, either.)
See Also:
Pascal ChemStation (PAWS)
DOS ChemStation
RTE Controller |
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