16-7
IM WT1801-01EN
Recording to a File (Record to File)
• If you set Record to File to ON, when high speed data capturing starts, the WT1800 saves the following two
files in binary format.
• High speed data capturing data file (.WTS): The measured data is saved to this file.
• High speed data capturing header file (.HDS): The measurement conditions, settings, and recording
information are saved to this file.
• File name extensions are added automatically.
• The
(File State) appears in the upper left of the screen. The file recording state appears as
“Ready,” “Rec,” “Stop,” or “Error,” depending on the state of high speed data capturing.
• If you set the save destination to a USB memory device, a high speed data capturing data file (.WTS) can
contain up to 1 GB of data or 10,000,000 data captures.
• The WT1800 cannot load the measurement data that has been recorded on a file.
• Under the following circumstances, recording to a file stops, and the file recording state changes to Stop.
The measurement operations for high speed data capturing continue without stopping.
• When the file save destination runs out of free space.
• When the size of the high speed data capturing data file exceeds the maximum value (1 GB).
• When high speed data capturing is performed 10,000,000 times.
• Do not output captured data through communication and record it to a file at the same time. Doing so can
lead to a reduction in the communication output speed and a reduction in the recording speed, can cause
recording to a file to stop, and can make the file recording state change to Error.
• In the following circumstances, it is possible for the data update speed to surpass the speed at which the
file is being recorded to, for recording to the file to stop, and for the file recording state to change to Error.
• When you perform consecutive operations in the setup menu.
• When the WT1800 receives consecutive communication commands.
• When you operate the WT1800 over FTP.
• When you save to a USB memory device with a slow write speed.
• When the write speed to the USB memory device that has been specified as the save destination is slow,
the data update speed exceeds the speed at which the file is being recorded to, and recording to the file
stops, you may be able to remedy the situation by using the methods described below.
• Reduce the number of items that are being saved.
• Using a faster USB memory device.
• When it takes a long time for data to be written to the USB memory device, recording to the file may be
stopped forcefully, and some data may not be saved. When this happens, the file state indication is "Error."
• Conversion to ASCII format (.csv) uses a pair of files that consists of a high speed data capturing data file
(.wts) and a high speed data capturing header file (.hds) with the same name. Do not change the names
of high speed data capturing data files (.wts) and high speed data capturing header files (.hds) for different
sets of data to the same name. If you do so, the WT1800 may malfunction and the USB memory may be
damaged when you convert the data to ASCII format (.csv).
• If you disconnect a USB memory device while a file is being recorded to and the file recording state
changes to Error, the high speed data capturing file may be incomplete or damaged. If this is the case,
you will not be able to convert the data to ASCII format (.csv). Be sure to only disconnect the USB memory
device when the file recording state is Ready.
• When you turn off the WT1800 power, the contents of the internal RAM disk are lost. Save the contents of
the RAM disk to a USB memory device or network drive before you turn off the WT1800.
• Please be aware that the number of times that you can write to USB memory is limited.
16 High Speed Data Capturing
