Hioki MR8740-50, Инструкция по эксплуатации

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Saving Data
Real-time save
Since setting the real-time save to [On] allows data to be saved in a storage device simultaneously
with measurement, the instrument can perform measurement for a long period of time regardless of
the capacity of the internal memory.
The measurement condition settings are different between setting the real-time save to [On] and
[Off] .
• When setting the real-time save to [On] , you cannot use the following functions:
Auto-save, trigger function, waveform calculation function, and memory division function.
• No storage device can be removed or replaced during the real-time save.
• If displaying the message, Warning No. 235 [Real-time save could not be completed within
available time.] , the instrument may record abnormal data in a waveform file saved in a storage
device.
• The operation may be automatically restricted or the magnification may be changed if there is a
risk that saving data cannot be completed in time during the real-time save.
• When any numerical calculation is set, only manual calculation can be executed.
After the measurement has been complete, select
> [Calculation] > [Numerical
calculation] , and then click [Execute] .
• When using a USB flash drive for real-time save, select Model Z4006 USB Drive (option).
• When using a flash drive for real-time save, connect it to the USB 3.0 connector on the rear side
of the instrument. Connecting the drive to the USB 2.0 connector cannot deliver the real-time
save speed specified in the product specifications.
Maximum recording time
• When the real-time save is set to [On] , the maximum recording time is determined based on the
recording interval, the remaining capacity of a storage device, and the number of channels to be
used.
• When the sampling rate is set at a slow rate, the recording time is set to a long period of time
(one year or more) depending on a condition. The operation cannot be guaranteed because the
warranty period or product life may disturb it.
• When the external sampling is used, the instrument calculates the maximum recording time
assuming a recording interval of 500 MS/s.
Refer to “Maximum recordable time when the real-time save is enabled (values for reference
purposes)” (p. 221).
Waveform data
When recording waveforms with the real-time save set to [On] , the instrument directly saves
measured waveform data (.MEM) onto a storage device. If the file size is large, the instrument
automatically divides the file into several files each of which has 512 MB and saves them.
Deleting and saving files when saving data in real time
• If the capacity of the storage device becomes full while the instrument is storing files, it
automatically deletes waveform files created after the measurement has started beginning from
the oldest, securing free space in the storage device. When free space in a storage device is less
than the sum of the created file size and 512 MB before starting a measurement, however, the
instrument cannot overwrite any new files over the older files. Use a storage device with as much
free space as possible.
• The instrument does not delete waveform files saved in the past.
• When [Method] is set to [Delete] , the recording length can be set at 10000 days at a maximum;
however, data the instrument retains after the measurement is limited to a free space size of a
storage device at the start of recording (recording time of the normal saving).