| Every Graph Sheet in Eclipse contains its own
definition regarding how the circuit is to be swept. The Sweep Properties dialog box shown
below contains this definition. 
The Sweep Properties dialog box contain multiple fields requiring you to input numeric
data. Pressing <TAB> after entering data will automatically move the cursor to the
next logical input field. The fields utilize the current default units: resistance,
inductance, capacitance, frequency, time and length where appropriate. When the cursor is
in a field utilizing default units, the dialog box will indicate the specific units for
that field. When you have finished entering data into these fields you may choose OK
or Cancel to accept or discard the entries. In either case the dialog box will be
closed.
Choosing a Sweep Type
The Type list box allows you to choose the method by which your circuit will swept:
| Frequency |
Sweeps the circuit over the range of specified frequencies
(default method) |
| Element parameter |
Sweeps the specified circuit element parameter over the range
of values at the frequency indicated |
| Variable |
Sweeps the specified User Variable over the range of values at
the frequency indicated |
You must select one of the methods by clicking on the list box and then
choosing one of the menu items. The default method is Frequency sweep.
Choosing a Sweep Style
The Style list box allows you to specify whether the sweep will be entered as a
Start/Stop or Center/Span set of values. The Start/Stop method defines the starting and
ending sweep values, while the Center/Span method specifies the arithmetic center and
total span. You must select one of the styles by clicking on the list box and then
choosing one of the menu items. The default method is Start/Stop.
Start Field
The sweep starting value. Used in conjunction with the Stop Field. This field is
affected by the Default Units.
Stop Field
The sweep ending value. Used in conjunction with the Start Field. This field is
affected by the Default Units.
Center Field
The arithmetic center of the sweep range. Used in conjunction with the Span Field. This
field is affected by the Default Units.
Span Field
The total span of the sweep range. Used in conjunction with the Center Field. This
field is affected by the Default Units.
Res And Step Fields
These fields are mutually exclusive, i.e., entering data in one causes data in the
other to be cleared. The Res ( resolution ) field specifies the size of a step in the
given sweep, whereas, the Step field allows you to specify the total number of steps. The
Res field is affected by the Default
Units.
Mode List Box
This list box controls whether the sweep will be spaced in linear (LIN) or logarithmic
(LOG) increments.
List Field
The List field allows you to specify a list of arbitrary values that will be combined
with the Start/Stop or Center/Span sweep values during analysis.
Ref And Elem Fields: Sweeping Elements
An Element Sweep allows you to graph output data versus an element parameter at a
single frequency. Any numeric element parameter may be swept. You must specify the element
parameter to be swept and the stationary frequency in the Ref and Elem fields
respectively.
Ref And Var Fields: Sweeping User Variables
A Variable Sweep allows you to graph output data versus a User Variable at a single
frequency. You must specify the frequency and the User Variable in the Ref and Var fields
respectively. The Frequency Default Units affect the Ref fieldProgramUnitsContext. The
Start/Stop and Center/Span fields will define the range over which the User Variable will
be swept.
Changing the Sheet's Name
You can change the name displayed on the sheet's tab by clicking the right mouse button
on the sheet tab and entering a new name in the resulting dialog box. The name should be
unique with respect to all other tabs.
Enabling/Disabling Sweep information
You may enable/disable all or part of the sweep information in the dialog box by
selecting the appropriate check box under the category, Use. If the check box is
cleared then the corresponding information will not be used.
Adding a Sheet Title
You may specify a title that will appear on printed sheets by entering the desired
information in the Title field.
Use Global Sweep
Each graph sheet has a local (private) sweep definition that can be used during
analysis. Additionally, there is a global sweep definition that is shared by any sheet
having the Use Global Sweep box checked. When checked, the sheet uses the global
definition during analysis; otherwise, the local definition is used. By default, each new
sheet is created with the global sweep selected. If you copy an existing Graph Sheet, the
local information in the source sheet will be duplicated in the destination sheet.
Transferring Sweep Definitions
The global sweep definition can be copied to a sheet's local definition, or vise versa.
Click the Transfer button and then select the displayed menu item to complete the transfer
of information.
General Sweep Information
Eclipse supports the concept of BlackBox elements (See the Element Library). Each
BlackBox references its own data file of frequency dependent parameters. The frequencies
defined in the Sweep Properties dialog box do not have to match the frequencies in the
files. When the circuit is solved at frequencies within the frequency range of the file
data, linear interpolation of the data is used. Linear extrapolation is used at
frequencies outside the data file range. Extrapolation outside a data file's range
generally results in useless data and should be avoided if possible.
|