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Scaling for Count Indication
The DP21‟s scale factor is factory set to 1, to provide one count on the
display for each pulse that is input to the unit. In many applications, there
will not be a one-to-one correspondence between input pulses and display
units. Therefore, it is necessary for the DP21 to scale or multiply the input
pulses by scaling factor to achieve the desired display units (feet, meters,
gallons, etc.).
The incoming pulses are multiplied by the count scale factor value and
stored in the internal count register which results in the desired count display
value. The scale factor is a prescaler, which means changing the scale factor
does not changes the existing internal count, but only effects the incoming
pulse count.
The Count Scale factor Value can range from 0.0001 to 99.9999. It is
important to note that the precision of a counter application cannot be
improved by using a scale factor greater than one. To accomplish greater
precision, more pulse information must be generated per measuring unit. The
following formula is use to calculate the scale factor.
Scale Factor = Desired Display Units x Decimal point Position
WHERE:
Desired display units : Count display unit acquired after pulse
Number of Pulses :
Decimal Point position :
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Number of pulse
that occurred
Number of pulses required to ahieve the
desired display units
0
=
1
0.0
=
10
0.00
=
100
0.000
=
1000
0.0000
=
10000
0.00000
=
100000
WISCO DP21 Manual V1.1
อี เ มล์
, www.wisco.co.th,
info@wisco.co.th
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