1-7
IM 707281-01E
1
Explanation of Functions
1.5 Waveform Generation in the AG Mode
Creating and Loading Arbitrary Waveform Data
Data that can be loaded as arbitrary waveform data must be of YOKOGAWA’s propri-
etary file format (extension: wvf) or be ASCII data in csv format.
Creating arbitrary waveform data
Creating a wvf file.
The file can be created in one of the following ways.
• Make measurements on the 4-CH, 100 kS/s Isolated Digitizer Module WE7271 or
other appropriate modules, and save the waveform data in wvf format.
• Use the Waveform Editor (707751) and save the arbitrary waveform data in wvf
format.
Creating ASCII data in csv format
Create a new ASCII data file in csv format according to the following guideline (extract
only the waveform data) from an ASCII data file in csv format that was saved using
another module or from a file that was created by using a spreadsheet application.
Column data : Handle as channel data.
Row data
: Handle as time axis data
For details, see page 1-13.
Loading method of arbitrary waveform data
Select and load the wvf or csv file containing the arbitrary waveform data that were created
according to the steps above. When loading a wvf file, a corresponding header file (file
extension: [.hdr]) is also needed. Auto and manual loading methods are available.
Auto load
Loads the data of all channels and blocks in the file at once. For wvf files, the following
settings are also loaded: the number of channels, the output voltage range of each channel,
the number of block partitions, and the sampling interval. For csv files, the number of
channels used is automatically loaded, but the number of block partitions is set to 1.
Manual load
Loads the data of the specified slot, channel, and block number. Only one block of one
channel can be loaded at once.
When using manual load, the slot/channel, block number, number of channels used, and
number of memory partitions of the data being loaded are specified.
Selecting the slot/channel
Select the slot/channel of the data being loaded.
Selecting the block number
Select to which block of the waveform data memory to load. This number is [1] when the
memory is not partitioned.
Selecting the number of channels used
Select the number of channels to use from 1, 2, or 4 channels.
Restrictions when loading arbitrary waveform data
The length of data that can be loaded varies depending on the number of channels used
and the number of memory partitions as follows. Data that exceed the maximum
allowable data length are discarded when loading the data.
Number of Channels used
Maximum Allowable Data Length
1
4 Mwords/number of memory partitions
2
2 Mwords/number of memory partitions
4
1 Mword/number of memory partitions
Data cannot be loaded using the auto load function if (the number of channels x the
number of blocks) is greater than 256 and the data length of each block is less than 150.