µDIGI2-E
µDIGI2-E
34
DISPLAY CONFIGURATION
Display Programming
Display scaling
IMPORTANT IN “tEAC” MODE:
To ensure the best accuracy, both points 1 and 2
should represent extreme process limits.
The second menu corresponds to display configuration. This, in turn, consists of some submenus: through frontal
keys configuration (
uSEr
→
SCAL
), through real input signal (
TEACH
) (
uSEr
→
“tEAC”
), calibrated range (
CAL
)
and reading stabilization filter (
FiLt
).
TRHOUGH FRONTAL KEYS CONFIGURATION “
SCAL
”
Input and display values are configured
manually through
the three keys
of the instrument. This method is suitable
when signal values supplied by the transducer at each
extreme point of the process are known.
REAL INPUT SIGNAL CONFIGURATION “
tEAC
”
Input values are
directly introduced from CN2 input
connector just at the moment of signal capturing at
each point of the process
. Display values are configured
manually through the three keys, as in the previous case.
This method is suitable when signal values at each point are
unknown but, it is possible to lead process to the conditions
defined by these extreme points.
WEIGHTED AVERAGE FILTER “
FiLt
”
Sets low-pass filter cutoff frequency (Fc) which allows the instrument to smooth out undesirable display reading
fluctuations.
Display scaling is necessary when adapting display reading to a particular engineering unit. Display range can be
configured between
-9999
and
9999
(14mm-high digits).
Display scaling is a linear process that consists in introducing two input values, referred as
Input 1
and
Input 2
,
and their respective display values, referred as
Display 1
and
Display 2
. On the basis of this proportional
relationship internal software calculates display value that would correspond to a given input value. Decimal point
position would complete required engineering units indication.
It is possible to scale display in an increasing or decreasing proportional mode depending on whether if second
display value (
DISP.2
) is greater or less than the first (
DISP.1
). In an increasing mode, display value increases
proportionally to the input value whereas in a decreasing mode, display value decreases. The left figure below
shows both scaling modes.
The right figure shows a
display scaling example for a
5A current measure using a
60mV shunt. Decimal point is
situated between second and
third digit of the display.
(05.00)
DISP.2
(00.00)
DISP.1
(00.00)
INP.1
(60.00)
INP.2
Increasing proportional mode
Decreasing proportional mode
DISPLAY 2
DISPLAY 1
DISPLAY 1
DISPLAY 2
INPUT 1 INPUT 2
INPUT 1 INPUT 2
