Red Lion LDSG User Manual
Page 7
7
FILTER BAND*
The digital filter will adapt to variations in the input signal. When the
variation exceeds the input filter band value, the digital filter disengages. When
the variation becomes less than the band value, the filter engages again. This
allows for a stable readout, but permits the display to settle rapidly after a large
process change. The value of the band is in display units. A band setting of ‘0’
keeps the digital filter permanently engaged.
to
display units
SCALING POINTS*
Linear - Scaling Points (2)
For linear processes, only 2 scaling points are necessary. It is recommended
that the 2 scaling points be at opposite ends of the input signal being applied.
The points do not have to be the signal limits. Display scaling will be linear
between and continue past the entered points up to the limits of the Input Signal
Jumper position. Each scaling point has a coordinate-pair of Input Value (
)
and an associated desired Display Value (
).
Nonlinear - Scaling Points (Greater than 2)
For non-linear processes, up to 16 scaling points may be used to provide a
piece-wise linear approximation. (The greater the number of scaling points
used, the greater the conformity accuracy.) The Input Display will be linear
between scaling points that are sequential in program order. Each scaling point
has a coordinate-pair of Input Value (
) and an associated desired Display
Value (
). Data from tables or equations, or empirical data could be used to
derive the required number of segments and data values for the coordinate pairs.
to
SCALING STYLE
If Input Values and corresponding Display Values are known, the Key-in
(
) scaling style can be used. This allows scaling without the presence or
changing of the input signal. If Input Values have to be derived from the actual
input signal source or simulator, the Apply (
) scaling style must be used.
After using the Apply (
) scaling style, this parameter will default back to
but the scaling values will be shown from the previous applied method.
key-in data
apply signal
INPUT VALUE FOR SCALING POINT 1
For Key-in (
), enter the known first Input Value by using the arrow keys.
The Input Range selection sets up the decimal location for the Input Value. With
0.02 V Input Range, 0 mV would be entered as 0.000. For Apply (
), apply
the input signal to the meter, adjust the signal source externally until the desired
Input Value appears. In either method, press the
PAR key to enter the value
being displayed.
to
Note:
style - Pressing the RST key will advance the display to the next
scaling display point without storing the input value.
*
Factory Setting can be used without affecting basic start-up.
DISPLAY VALUE FOR SCALING POINT 1
to
Enter the first coordinating Display Value by using the arrow keys. This is
the same for
and
scaling styles. The decimal point follows the
selection.
INPUT VALUE FOR SCALING POINT 2
to
For Key-in (
), enter the known second Input Value by using the arrow
keys. For Apply (
), adjust the signal source externally until the next
desired Input Value appears. (Follow the same procedure if using more than 2
scaling points.) With 0.02 V Input Range, 20 mV would be entered as 20.000.
DISPLAY VALUE FOR SCALING POINT 2
to
Enter the second coordinating Display Value by using the arrow keys. This
is the same for
and
scaling styles. (Follow the same procedure if
using more than 2 scaling points.)
General Notes on Scaling
1. Input Values for scaling points should be confined to the limits of the Input
Range Jumper position.
2. The same Input Value should not correspond to more than one Display Value.
(Example: 20 mV can not equal 0 and 10.)
This is referred to as read out jumps (vertical scaled segments).
3. The same Display Value can correspond to more than one Input Value.
(Example: 0 mV and 20 mV can equal 10.)
This is referred to as readout dead zones (horizontal scaled segments).
4. The maximum scaled Display Value spread between range maximum and
minimum is limited to 65,535. For example using 20 mV range the maximum
+20 mV can be scaled to is 32,767 with 0 mV being 0 and Display Rounding
of 1. (Decimal points are ignored.) The other half of 65,535 is for the lower
half of the range 0 to -20 mV even if it is not used. With Display Rounding
of 2, +20 mV can be scaled for 65,535 (32,767 x 2) but with even Input
Display values shown.
5. For input levels beyond the last programmed Input Value, the meter extends
the Display Value by calculating the slope from the last two sequential
coordinate pairs. If three coordinate pair scaling points were entered, then the
Display Value calculation would be between
/
&
/
.
The calculations stop at the limits of the Input Range Jumper position.