Chapter Seven: Operation in Setup Mode
How To Configure an Analog Output
209
Linear Scaling
In linear scaling, the voltage versus pressure curve is linear over its entire length. Refer to
Figure 64 for a scalar representation of voltage versus pressure.
Volts
Torr
0 1 2
3 4 5
6 7 8 9 10
600 700 800 900 1000
0 100 200 300 400 500
Figure 64: Linear: Voltage versus Pressure
Logarithmic Scaling
In logarithmic scaling, the voltage versus pressure curve is logarithmic over its upper portion,
and linear over its lower portion. The boundary between linear and logarithmic scaling is
determined by the selection of LO1 through LO9. The numerals 1 through 9 represent the
number of logarithmic decades in the output. Each logarithmic decade is equal to 1 Volt. As an
example, you want the full scale voltage of 10 Volts to correspond to 20 Torr, and you want three
decades of logarithmic output. To accomplish this, select LO3. Refer to Figure 65 for a scalar
representation of voltage versus pressure with three decades of logarithmic output.
0
Volts
Torr
linear
logarithmic
Scaling
0 1 2
3 4 5
6 7 8 9 10
0.01
0.02
0.2
2
20
Figure 65: Linear and Logarithmic: Voltage versus Pressure
Set Point
In the case of a set point (select SP in the right display), a fixed voltage is sent from the 146 unit,
regardless of the pressure readings received.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Setup Mode.
The system responds by scrolling through modes.
2. Use the arrow keys to scroll to the
ANALOG END POINT
legend.
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