Specifying Measurement Conditions

• Initialize the E4990A to the Preset State

• Select Fixture

• Select |Z|-Theta as the Measurement Parameter

• Select Frequency in Log as the Sweep Parameter

• Set the Sweep Start/Stop Value

• Set the Measurement Speed

Other topics about Measurement Example

Next, you need to specify how your E4990A should perform the measurement.

• Through this procedure, you will configure parameters that apply to both Traces, A and B. You can set each parameter without specifying the active trace or checking its current settings.

Initialize the E4990A to the Preset State

Press the Preset key to initialize the E4990A.

This puts the E4990A into its preset state.

• If you turn on the  E4990A with a power-on setting file residing on the flash memory (nonvolatile memory disk), the file is automatically loaded, and the settings contained in the file are restored. Initializing the E4990A to its preset state ensures that no specific settings are inherited from the last measurement session. Therefore, you should initialize the E4990A by pressing the Preset key whenever you are configuring it for a new measurement session, regardless of whether you turned the instrument off and back on after the previous session.

• Note that initializing the E4990A with the Preset key does not affect which type of adapter the instrument is configured to use. Once you have set the adapter type, the setting is retained until you select another adapter type.

Select Fixture

1. Press the Cal key to display the Cal Compen (Calibration Compensation) menu.

2. Select the 16047E test fixture by clicking Accessory > 16047E.

Select |Z|-Theta as the Measurement Parameter

To select the measurement parameter, follow these steps:

1. Press the Meas > Measurement key to display the Measurement menu.

2. Ensure that the |Z|- qz key is selected for Trace 1 & 2 (this key is selected by default in the preset state). With this selection, Trace 1 reflects the absolute impedance value while Trace 2 reflects the impedance phase.

Select Frequency in Log as the Sweep Parameter

1. Press the Sweep Setup key to display the Sweep Setup menu.

2. At Sweep Type softkey, select Log Freq (Logarithmic Frequency).

Set the Sweep Start/Stop Value

1. Press the Start key. The current setting of the sweep start value appears at the Start parameter.

2. Enter 100 Hz.

   • If you are using the ENTRY block keys, type: [1][0][0], and press the [1] key in the ENTRY block. This puts your entry into effect.

3. Press the Stop key. The current setting of the sweep stop value appears at the Stop parameter.

4. Enter 100 MHz.

   • If you are using the ENTRY block keys, type: [1][0][0], and press the [M/m] key in the ENTRY block. This puts your entry into effect.

Set the Measurement Speed

1. Press the Avg key to display the Average menu.

2. Click the Meas Time and select 2 as the measurement bandwidth.

   • Meas Time 1 provides the fastest measurement and 5 provides the slowest but more precise measurement.