Chapter Five: Operation in Leakage Mode
How To Calculate the Analog Set Point
143
How To Calculate the Analog Set Point
The analog set point input is a linear input sent through the lower connector on the optional
Control board. The input corresponds to an analog set point value (refer to Figure 39). By
adjusting the analog set point input voltage, the analog set point is changed. The default settings
are for an analog input of 0.0 Volts to correspond to a zero set point, and for a 5 Volt input to
define a 1000 Torr set point. The acceptable analog input voltage range is 0 to 10 Volts, with the
default full scale voltage set at 5 Volts. The ability to define the set point through an analog
input is disabled by default. Refer to Code 15x: How To Set Up Analog Set Point, in the
Operation in Setup Mode chapter for instructions on how to enable the analog set point feature.
Analog set point is a voltage input that
determines the analog set point.
Analog Set Point (Torr)
I
n
p
u
t
V
o
l
t
a
g
e
0
0
500
1000
2.5
5
Figure 39: Graph Showing Analog Set Point Defaults
The lower and upper points of the analog input voltage range can be altered (refer to Figure 40,
page 144) in Normal and Leakage Modes. By changing either one, or both of these points, the
slope of the analog input voltage versus analog set point line is changed. As a result of the
change in slope, a fixed input voltage defines a different analog set point. To adjust the lower
and upper points in Normal and Leakage Modes, the current analog input voltage must be
altered. To change the upper point (not the lower point), independent of the current analog input,
refer to Code 15x: How To Set Up Analog Set Point, in the Operation in Setup Mode chapter.
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