Manual
13
5.3.3
Digital filter
The following setting options are available:
-
OFF
(no filter; factory default setting)
-
F 1
(the smallest filter level)
-
F 2
-
F 3
(middle filter level)
-
F 4
-
F 5
(the highest filter level)
With
you can select the desired filter. Confirm the selection with
.
Technical note to the filter function:
FIR (Finite Impulse Response) are feedback-free, phase linear digital filters with finite impulse response
the filtered values y (n) of which are calculated from a certain, just distant past of the input signal x. With
the FIR filter, the calculation of the y-value refers to the finite past.
The function of an FIR filter can be compared, for example, with the formation of a sliding mean value.
Then, the sum of "n" successive values is formed and divided by "n". After that, the group of “n” values is
shifted continuously each by one clock, and every time the mean value is formed again. The maximum
number of the past values which are considered during the calculation is then defined as an order. The
higher the order is, the better the properties of the filter are, though the computational complexity is also
higher then. For the display device it means, that the higher the order of the selected filter, the more
values are taken into account in the averaging.
5.4
Factory setup
Note:
this menu is password protected and can only be used by our service technicians. It is used for
configuration and calibration of the measuring instrument.
6
Save and transfer the measurement data
6.1
Peak values
If the peak values function is activated, the device saves the pre-set number of peaks in EXCEL
compatible file with the extension * .csv. The format is called "Microsoft Office Excel Comma Separated
Values File".
If the number of the peak values, which was defined in the menu item "number / quantity" is reached, the
file closes automatically. The file name for peak values files is Peakxyz.csv where xyz stands for a
consecutive number starting with 001.
The detected peak value appears on the display. In square brackets the remaining capacity of memory of
the current file is displayed.
The peak value is stored by pressing
.
Note: in this case the file closes itself when the pre-set number of peaks is not reached yet!
Saving is stopped if you select the menu item "no saving" or if the space on the SD memory card is full.
