Chauvin Arnoux DTR 8510 Bedienungsanleitung Seite 55

4.3.5. SELECT STORAGE MODE
1. From the top level of Configure Instrument, press the  or  key until Select Storage Mode appears on the display, then
press ENTER.
Select Auto or Manual using  or  and press ENTER. The display will return to Configure Instrument > Select Storage
2.
Mode.
NOTE:
„ In Manual mode, the user has a choice at the end of a test whether to store the Measurement Record or not. The user also
has a choice of where to store the Measurement Record. So it is possible for the user to store the Measurement Record at
various locations leaving gaps in the storage memory map.
All Measurement Records will be downloaded no matter where they are stored in the memory.
„ In Auto mode, the instrument will store the Measurement Record at the end of a test starting with the first available location.
All the subsequent Measurement Records will be stored sequentially.
If the previously stored Measurement Record is encountered, the Auto store mode will skip over and store the new Measurement
Record in the next available location.
NOTE: If the DTR
saved in the instrument but will be sent to the computer.
4.3.6. SELECT FILTER
1. From the top level of Configure Instrument, press the  or  key until Select Filter appears on the display, then press ENTER.
2. Select Fast, Normal or Slow using  or  and press ENTER. The display will return to Configure Instrument > Select Filter.
NOTE: The DTR
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electrical noise. These are sophisticated digital filters in the design which offer maximum noise rejection for repeatable
measurements.
Digital Filters:
The digitalization of signal is done with Sigma-Delta (Σ-Δ) modulator. The output is a high frequency bit stream which is fed to a
digital filter. The filtering of signal is performed with sophisticated sinc (Sinx/x) filter. The primary function of the filter is to remove
the quantification noise introduced during the modulation process.
The filter limits the band of the allowed frequency to significantly lower than one-half of the frequency of the modulator itself. This
reduces the 1-bit output of a comparator in a band-limited, very low noise output. The cut-off frequency and the decimated data
rate are appropriately programmed in the internal registered and the output is arithmetically averaged to provide an accurate
final answer.
High decimation results in lower noise but at a slower throughput rate. The calculation of arithmetic mean is a quick process at
high clock speeds of the microprocessors.
8510 is connected to a computer, Auto mode will be disabled. The Measurement Record will not be
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8510 offers the user a choice of three digital filters for measurement, depending upon the external
Figure 4-16
Figure 4-17
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