User`s manual

11-15
IM 701610-01E
Saving and Loading Data to and from the Storage Medium
11
11.6 Saving/Loading Waveform Data
Explanation
Selecting the Data Type, File Extension
Binary
• The sampled data in the acquisition memory are saved in binary format.
• The data that are saved can be loaded to display the waveform and compute
numerical data.
•A header file is automatically created. The header file is used when analyzing the
waveform on a PC. The header file cannot be opened using this instrument. For the
header file format, see Appendix 3, “ASCII Header File Format.”
• The file extension is .WVF. The file extension of the header file is .HDR.
• When saving waveform data in binary format, a header file is automatically created
with the extension .HDR. When the DL1620/DL1640/DL1640L is used to copy,
delete, change filenames, or change file ownership of waveform data files (files with
the extension, .WVF), the header files are automatically updated to reflect the
changes. Do not delete the header file only or the waveform data file only as this may
cause a system malfunction.
ASCII
• The units of the sampled data in the acquisition memory are converted per the specified
range and saved in ASCII format. The data can be used to analyze the waveform on a PC.
• Data in this format cannot be loaded on this instrument.
• The file extension is .CSV.
Float
• The units of the sampled data in the acquisition memory are converted per the
specified range and saved in 32-bit floating format. The data can be used to analyze
the waveform on a PC.
• The order of the data is little-endian (Intel format).
• Data in this format cannot be loaded on this instrument.
• The file extension is .FLD.
Data Size
The following list shows the data size when the record length is set to 100 kwords,
waveform data of CH1 to CH4 are saved, and Math1 and Math2 are turned OFF
Data Type Extension Data Size (Bytes)
Binary .WVF Approx. 850 K bytes ((100 kwords + 32) × 4 channels × number of
history waveform × 2+ 46 K)
.HDR Approx. 2 K bytes (approx. 3 K if Math1 and Math2 are ON.)
ASCII .CSV Approx. 4 M to 5 M bytes (depends on the input signal condition.)
It takes more than 10 minutes to save the file.
Float .FLD Approx. 1.6 Mbytes ((100 kwords + 32) × 4 channels × number of
history waveform × 4)
Selecting the Waveform to be Saved
• You can save all waveforms or the specified waveforms from CH1 to CH4, Math1,
Math2 (or CH1, CH2, and Math1 for the DL1620).
• The vertical and horizontal axes and trigger settings of the waveform being saved are
also saved.
• For waveforms that are loaded using the history memory function, you can save only
the waveform currently displayed. You can also save only the search results of the
data in the history memory.
For details regarding data search of the history memory, see sections 7.8 to 7.9.
• For snapshot waveforms, see section 11.8, “Saving/Loading the Snapshot
Waveforms.”