Stepping

How do I step multiple resistors, capacitors, or inductors?

There are two methods to step multiple resistors, capacitors, or inductors. In the following two examples, two resistors will be stepped from 10k to 100k. These methods may be used for more than two resistors, or for capacitors and inductors.

Using Model Statements
Place two resistors in the schematic with their attributes defined as follows:

PART R1 R2
RESISTANCE 10k 10k
MODEL RDY RDY

The RDY model statement should read:

.model RDY RES (R=1)

This model statement can be edited in the text area of the schematic or through the Attribute dialog box, but the default model statement appears as above. Enter the appropriate analysis. Click on the Stepping command button in the Analysis Limits dialog box. In the Stepping dialog box, make sure that the Parameter Type is set to Model. The text fields in the Stepping dialog box should appear as:

Step What RES RDY
R
From 1
To 10
Step Value 1

The parameter R multiplies its value by the RESISTANCE attribute of the resistors that reference it (10k in this case) to get the final resistance value. In this case, it will step the resistance from 10k*1 to 10k*10.

Using Symbolic Parameters
Place two resistors in the schematic with their attributes defined as follows:

PART R1 R2
RESISTANCE RVAL RVAL
MODEL

In either the text area or the schematic itself, place the text '.define RVAL 10k'. Enter the appropriate analysis. Click on the Stepping command button in the Analysis Limits dialog box. In the Stepping dialog box, make sure that the Parameter Type is set to Symbolic. The text fields in the Stepping dialog box should appear as:

Step What RVAL
From 10k
To 100k
Step Value 10k

This steps the symbolic parameter RVAL from 10k to 100k, and subsequently steps the two resistors that reference this parameter.