User Guide

Chapter 12 Monte Carlo and sensitivity/worst-case analyses
294
• To connect the parts, from the Place menu, choose
Wire.
• To move values or reference designators, click the
value or reference designator to select it, then drag it
to the new location.
Defining part values
Define the part values as shown in Figure 78. For the
pressure sensor, you need to do the following:
• Change the resistor values for R3, R5, R6, and R7 from
their default value of 1 k.
• Set the DC value for the V1 voltage source.
To change resistor values
1 Double-click the value for a resistor.
2 Type the new value. Depending on the resistor you are
changing, set its value to one of the following (refer to
Figure 78).
3 Repeat steps 1
-2 for each resistor on your schematic
page.
To set the DC value for the V1 source and make it visible
1 Double-click the V1 source part.
2 In the Parts Spreadsheet, click in the cell under the DC
column.
3 Type
1.35v.
Table 1
If you are changing
this resistor... Type this...
R3
{1k*(1+P*Pcoeff/Pnom)}
R5
2k
R6
470
R7
25
S+W
Note Because t
h
e Meter source is use
d
to
measure current, it has no DC value and
can be left unchanged.
Note T
h
e va
l
ue
f
or R3—
{
1k*(1+P*Pcoeff/Pnom)}—is an
expression that represents linear
dependence of resistance on pressure. To
complete the definition for R3, you will
create and define global parameters for
Pcoeff, P, and Pnom later on in this
example
Pspug.book Page 294 Wednesday, November 11, 1998 1:14 PM