Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 251)

7-5
IM 04L31A01-01E
Measurement Function Related Setup Operations
7
Note
• Relationship with the reference channel
Even if the input types (Volt, TC, RTD, or DI) or the measurement ranges between the
difference computation channel and reference channel are not the same, the difference
computation is performed according to the following rules.
•
If the number of digits to the right of the decimal is different between the reference
channel and the difference computation channel, the number of digits to the right of the
decimal of the measured value of the reference channel is matched to that of the
difference computation channel, and the difference is computed.
Example: If the measured value of the difference computation channel is 10.00 and the
measured value of the reference channel is 100.0, the computed result is 10
– 100.0 = –90.00.
• If the units between the reference channel and the computation channel differ, unit
correction is not performed.
Example: If the measured value of the difference computation channel is 10.00 mV
and the measured value of the reference channel is 5.00 mV, the computed
result is 10.00 V – 5.00 mV = 5.00 V.
• If the [Mode] of the reference channel is set to [Scale] or [Sqrt], the scale value is used
for the computation.
• When set to [Scale]
Select this mode when scaling the measured value to a value in an appropriate unit
for the measurement. Select the type (input type) from [Volt], [TC], [RTD], and [DI].
Then, set [Range], [Span Lower/Upper], as well as [Scale Lower/Upper] and [Unit]
after the conversion. The selectable [Range] is the same as when other inputs are
selected with the mode. The selectable range of [Scale] is [–30000] to [30000].
The decimal point position can be set to “X.XXXX,” “XX.XXX,” “XXX.XX,” “XXXX.X,”
or “XXXXX.” The decimal point position is determined by the [Scale Lower] setting.
Note
The CX2000 converts the measured value to a value obtained by removing the decimal point
from the value range specified by [Scale Lower] and [Scale Upper]. In other words, if the
[Scale] setting is [–5] to [5], the value is converted to a value within the span of “10”; if the
[Scale] setting is [–5.0] to [5.0], the value is converted to a value within a span of “100.” In
this case, the resolution of the value converted to a span of “10” is lower than the value
converted to a span of “100.” To prevent the display from becoming coarse, set the [Scale]
setting so that this value is greater than 100 as much as possible.
• When set to [Sqrt] (square root computation)
Select this mode when computing the square root of the DC voltage input and
converting the computed result to a value with an appropriate unit for displaying.
Select the input range from [20mV], [60mV], [200mV], [2V], [6V], [20V], and [50V].
Then, set [Span Lower/Upper] (measurement span) of the input as well as [Scale
Lower/Upper] and [Unit] after the conversion. The selectable range of [Scale] is [–
30000] to [30000]. The decimal point position can be set to “X.XXXX,” “XX.XXX,”
“XXX.XX,” “XXXX.X,” or “XXXXX.” The decimal point position is determined by the
[Scale Lower] setting.
Note
• You cannot set the same value to [Scale Lower] and [Scale Upper].
• The CX2000 converts the measured value to a value obtained by removing the decimal
point from the value span specified by [Scale Lower] and [Scale Upper]. In other words, if
the [Scale] setting is [–5] to [5], the value is converted to a value within the span of “10”; if
the [Scale] setting is [–5.0] to [5.0], the value is converted to a value within a span of
“100.” In this case, the resolution of the value converted to a span of “10” is lower than the
value converted to a span of “100.” To prevent the display from becoming coarse, set the
[Scale] setting so that this value is greater than 100 as much as possible.
Setting the Moving Average
• First-CH/Last-CH
Select the range of channels for setting the moving average.
• Moving average
Select the sampling data count of the moving average from [2] to [16].
7.1 Settings Related to Measurement Inputs