Measurement Example of a Capacitor (Port 1-2/Shunt-Through)

This section describes how to measure the frequency characteristics of a capacitor using the Series-Through method on ports 1 and 2.

In this example, the following items are used.

Description

Product/Keysight Part Number

Note

Test Fixture with DUT (Capacitor)

PC board user fixture

-

Test Fixture with Open or Short

PC board user fixture

-

Calibration Kit

85033E

Mechanical Calibration Kit, DC to 9 GHz, 3.5 mm

Cable and Adapter

Cables and adapters for Type-N or 3.5 mm

Connect your PC board to ports 1 and 2 of the E5061B

To measure another device under test (DUT), change the measurement conditions to suit the particular DUT.

STEP 1. Determining Measurement Conditions

  1. Preset the E5061B.

    Preset     > OK

  2. Set the number of traces at two and display each trace in one frame. 

    Display     > Num of Traces > 2

    Display     > Allocate Traces > x2  

  3. Set the measurement port to Gain-Phase.

    Meas     > Measurement Port > S-Parameter

  4. Set the method  to Port 1-2 Shunt-Through configuration.

    Meas     > Impedance Analysis Menu > Method > Port 1-2 Shunt

  5. Set the measurement parameter at |Z| for the trace 1 and θ type of each trace.

     Select Trace 1 as the active trace.  Meas > Impedance Analysis Menu > |Z|

     Select Trace 2 as the active trace.  Meas > Impedance Analysis Menu > θz

  6. Specify the center and span frequencies to observe the frequency characteristic. In this example, the start is set at 100 kHz and stop is set at 1 GHz

    Start     > 1 > 0 > 0 > k/m 
    Stop     > 1 > G/n

  1. When entering the frequency unit using the keyboard, type "G" for GHz, "M" for MHz, and "k" for kHz.

  1. Set the power level at 0 dBm (224 mV @ 50 Ω).

    Sweep Setup     > Power > 0  > x1

  2. Set the sweep type at Log.

    Sweep Setup     > Sweep Type > Log Freq 

  3. Set the IF Bandwidth at 100 Hz.

    Avg > IF Bandwidth > 1 > 0 > 0  > x1

STEP 2. Calibration

  1. Select the calibration kit for 85033E.

    Cal > Cal Kit > 85033E

  2. Connect the two 3.5 mm cables on both ports 1 and 2.

  3. Perform Full 2-Port Calibration at the end of each cables.

  4. Connect the fixture with open (or short) between the cables.

     

  5. Perform Auto Port Extension.

STEP 3. Connecting the Device Under Test (DUT)

  1. Connect the fixture with DUT between the cables instead of the fixture, with open (or short).

  2. Set the log scale for Trace 1.

    Select Trace 1 as the active trace.  Scale > Y-Axis > Log

  3. Set the appropriate scale for both traces by executing the auto scale.

    Scale     > Auto Scale All

STEP 4. Analyzing Measurement Results

This section describes how to use the Equivalent circuit analysis.

Using Equivalent Circuit Analysis

  1. Select the Equivalent circuit model.

    Analysis > Equivalent Circuit > Select Circuit > E.

  2. Turn the Equivalent Circuit Display ON.

    Analysis > Equivalent Circuit > Display

  3. Calculate each parameter of the circuit model.

    Calculate. The calculated parameters are displayed in each box of R1, C1 and L1.

  4. You can simulate the frequency characteristics by using the approximate value obtained from the above calculation.

    Analysis > Equivalent Circuit > Simulate

Measurement Result