Using Equivalent Circuit Analysis

Other topics about Analyzing the Measurement

Overview

The E5061B Option 005 provides five types of equivalent circuit models; four types of 3-element equivalent circuits and one type of 4-element equivalent circuits. These circuits can be used to calculate the approximate values of the equivalent circuit parameters from the measurement data as well as to display the frequency characteristics on the screen based on the input equivalent circuit parameter.

The following table shows the selection of equivalent circuit:

Equivalent Circuit Model

Typical Frequency Characteristics

DUT Example

A *1

Inductor with high core loss

B  *1 Inductor
Resistor
C *1

High-value resistor

D *1

Capacitor

E *2 Resonator

*1. Measurement parameter: |Z| - q, Sweep type: log, Vertical axis: |Z| is log and q is linear.

*2. Measurement parameter: |Z| - q, Sweep type: linear (or log), Vertical axis: |Z| is log and q is linear.

Equivalent Circuit Menu

The equivalent circuit analysis function is only available when option 005 Impedance Analysis is installed and impedance measurement is selected (Meas> Impedance Analysis Menu).

Select Circuit

Shows the menu bar to select one of the five equivalent circuit model:

Model A - Generally suited to analyze inductors with high core loss.

Model B - Generally suited to analyze general inductors and resistors.

Model C - Generally suited to analyze resistors with high resistance.

Model D - Generally suited to analyze capacitors.

Model E - Generally suited to analyze resonators and oscillators.

Calculate

Calculates the equivalent circuit parameters based on the measurement results and the selected equivalent circuit model.

R1

Allows you to enter the R1 parameter for the equivalent circuit model selected at Select Circuit. Also displays the equivalent R1 parameter calculated when Calculate is selected.

C1

Allows you to enter the C1 parameter for the equivalent circuit model selected at Select Circuit. Also displays the equivalent C1 parameter calculated when Calculate is selected.

L1

Allows you to enter the L1 parameter for the equivalent circuit model selected at Select Circuit. Also displays the equivalent L1 parameter calculated when Calculate is selected.

C0

Allows you to enter the C0 parameter for the equivalent circuit model selected at Select Circuit. When equivalent circuit model E is not selected, C0 is disabled. Also displays the equivalent C0 parameter calculated when Calculate is selected.

Simulate

Simulates the selected equivalent circuit model frequency characterization based on the equivalent circuit parameter entered or calculated by the Calculate button. It is performed for all traces. The simulated results are stored into the memory trace and displayed on screen. When the Simulate is ON, Memory Trace is updated automatically.

Display

Displays the equivalent circuit model in schematic and the value of each equivalent parameter on the bottom-left of the channel window.

Export to TXT File...

Saves the equivalent circuit parameters in text file at user-defined location.

Performing Equivalent Circuit Analysis

Step 1: Performing impedance measurement

Step 2: Selecting equivalent circuit

  1. Press Analysis in the MKR/ANALYSIS block on the front panel.
  2. Click Equivalent Circuit.
  3. Click Select Circuit.
  4. Select the desired equivalent circuit model from the five equivalent circuit models.

Step 3: Calculating equivalent circuit

  1. Click Calculate to execute calculation of the equivalent circuit parameter.

The calculated equivalent circuit parameters are displayed in each box of R1, C1, L1 and C0.

Step 4: Simulating equivalent circuit

  1. Click Simulate.

The selected equivalent circuit model frequency characterization is simulated based on the equivalent circuit parameter entered or calculated by the Calculate button. The simulated results are stored into the memory trace and displayed on screen.

Step 5: Saving equivalent circuit

  1. Click Export to TXT File....
  2. Save As dialog box shows.
  3. Select the desired file name and location. The default file name is D:\EqvCkt01.txt.
  4. Click Save.