IOtech MultiScan 1200, User Manual

Page: 116 / 364

106 Chapter 9: TempView TempScan / MultiScan User's Manual
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Volts. If the channel is configured for volts, then the units automatically default to V (volts). At
this point, you have the option of selecting mV (millivolts). You also have the option of selecting
the equation mX+b . This option is discussed below.
•
Equation mX+b. The mX+b equation is typically not used for temperature readings, since
temperature data will be linear. However, you may use the equation in temperature applications.
For example, you can set
b to -32 in order to watch deviations from freezing point when
temperature is in °F.
Configure Engineering Units Dialog Box
(After selecting mX+b for Units)
When you select the mX+b option, the Configure Engineering Units dialog box appears. You are
prompted to define m , b , the Engineering Units Label , as well as the Standard Units to which the
mX+b equation should be applied. The Engineering Units chosen will be displayed in the Units
spreadsheet column, and the mX+b equation will be applied to the device reading before the
reading is displayed or written to disk. The mX+b option should be used when a channel is
reading a voltage needed to calculate a linearly-correlated unattainable reading. In this voltage
case, for
mX+b :
•
m is (but not limited to) a non-zero proportionality constant or gain factor.
•
X is the scanned-voltage value read back from the TempScan/1100 or MultiScan/1200.
•
b is the offset value, or the non-zero value of the calculated reading when the scanned value is
zero.
Reading Column
The Reading column displays the input readings of the TempScan/1100 or MultiScan/1200. These
readings are real-time channel values which cannot be changed, and which update as fast as the
computer will allow. Likewise, other areas of the spreadsheet cannot be changed while the
Reading
column is enabled.
You can activate this column by selecting the Acquire > Enable Spreadsheet Reading menu item, or by
clicking on its corresponding toolbar button
(7)
.