Ditel JR-D Manual Tecnico página 65

EXAMPLES OF CONFIGURATION OPERATING AS FREQUENCY METER:
It is possible to operate as a frequency meter configuring the instrument as tachometer (rAtE) and scaling display
properly.
For a mains frequency measurement (50Hz), using high voltage input the parameters to configure could be: direct
proportional variation (dir) ; "FrEC": 0500 ; decimal point: 050.0 ; "diSP": 0500 ; decimal point: 050.0
For a frequency of 20kHz measurement, the parameters to configure could be: direct proportional variation
(dir) ; "FrEC": 1000 ; (no decimal point) ; "diSP": 0010 ; decimal point: 001.0
Average measurement maximum time (tMAH) and time limit (tLiM)
(tachometer mode only)
The instrument configured as tachometer with parameters properly programmed ("PPr" and
"dCP" for rpm mode and "FrEC" and "diSP" for rate mode) should operate correctly.
>3s
However, depending on the sensor type, it may be necessary to modifiy internal
measurement times.
tMAH
After defining decimal point position at the end of the two configuration routines for rpm
and rate modes, it is possible to acces the routine that it is shown on the left to modify
"tMAH" and "tLiM" parameters by pressing ENTER for at least 3 seconds.
0.1
AVERAGE MEASUREMENT MAXIMUM TIME "tMAH"
With irregular input signals, display may present fluttering or unwanted variations due that
the number of input cycles detected at each reading are not equal.
tLiM
"tMAH" parameter allows to extend the average measurement time in seconds to increase
taken signal periods during measurement time, reducing the possibility of display variations.
A value of 0.0 means that no average will be made and every measure will be displayed.
10
This parameter can be programmed from 0.1 to 9.9 seconds (0.1s by default).
To help stabilizing the display in case of irregular input signals it is recommended to increment this parameter,
taking into account that the display readout will be updated at the programmed time. This parameter can be
reduced, if the input signal is stable at operating frequency, to increment the display refresh rate.
Once tMAH value is entered, press again ENTER to move to the next step.
TIME LIMIT "tLiM"
Time limit, programmable from 1 to 99 seconds (10s by default), allows to limitate waiting time until at least 1
pulse is received at the input before considering it to be 'zero'. If no pulse is detected before programmed time is
elapsed, the display goes to zero.
Decreasing time limit makes instrument be able to respond more quickly to the zero condition when system stops
but, this reduction leads to an increment of the minimum displayable reading before display goes to zero. The
value for this parameter must be always greater or equal to possible minimum period of input signal.
Once tLiM value is entered, press again ENTER to save changes.
SERIE KOSMOS www.ditel.es
JR-D / JR20-D
65