RKC INSTRUMENT SBR-EW180, User Manual

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1-3
IMSBR10-E1
Functional Description
1
• Delta Computation
The value obtained by subtracting the measured value of another channel (called the reference channel) from the
input value of the channel set to delta computation is used as the measured value of that channel. The reference
channel must be assigned to a channel whose channel number is less than that of the channel on which delta
computation is specified. The channel on which delta computation is specified is automatically set to the same
range type as the reference channel.
Input
value
Measured value on the reference channel
DC voltage
Channel set to delta computation
Measured value
–
Note
A channel whose input type is set to DC voltage, TC, or RTD can be designated as a reference
channel. However, channels set to scaling or square root computation cannot be designated.
• Scaling
The input values are scaled to values in the appropriate unit to be used as measured values.
0 V
−
100.0 ˚ C
10 V 300.0 ˚ C
Measured value Input value
• Square Root Computation
When the input type is DC voltage, the square root of the input value is calculated, the result is scaled to a
value in the appropriate unit, and used as the measured value of the channel. Also, the low-cut function (input
less than a given measured value is fixed to 0 (scale left value)) can be used.
Input value
Low-cut value
Result of square
root computation
Measured value
Channel set to square root computation
Measured value
√ Scaling
Note
The square root computation on the recorder uses the following formula.
F = ( F - F )
V - V
V - V
+ F
x
x
max
max min
min min
min
where Vmin (leftmost value of span) < Vmax (rightmost value of span)
Fmin (leftmost value of scale after scaling) < Fmax (rightmost value of scale after
scaling)
Vx is the input voltage and Fx is the scaled value
1.2 Measuring Input Section