Chapter Four: Operation in Normal Mode
How To Calculate the Analog Set Point
119
When adjusting the lower point,
the upper point remains fixed,
and the slope changes.
Original slope
When adjusting the upper point,
the lower point remains fixed,
and the slope changes.
I
n
p
u
t
V
o
l
t
a
g
e
0
0
Analog Set Point (Torr)
1000
5
Figure 32: Adjusting Lower and Upper Points for Analog Set Point Calculations
Adjusting the Lower Point of the Analog Set Point Input Voltage Range
The analog set point feature does not need to be enabled to allow a change in the lower point of
the analog input voltage range. However, the feature must be enabled to allow the 146 unit to
control with an analog set point (refer to Code 15x: How To Set Up Analog Set Point in the
Operation in Setup Mode chapter).
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Normal mode.
The system responds by scrolling through modes.
2. Provide an analog input equal to the desired low point on the input voltage scale.
3. Press the [
ZERO
/
EXP
] key, followed by the [
DEGAS
/
SET POINT
] key.
The system responds by setting the lower point of the analog set point input range equal
to the current analog input. The upper point of the input range remains fixed. The slope
of the analog input voltage versus analog set point line changes.
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