Beatrice Lang
The electrical length of a test fixture is an important factor in impedance measurements. The Keysight E5061B is a network analyser that can be used to measure impedance. To measure the electrical length of a fixture using the E5061B, you will need to connect the 16196A test fixture to the terminal adapter and set the electrical length. This involves turning the adapter's 7-mm connector in the counterclockwise direction and screwing the connection sleeve in fully. Once the test fixture is connected, you can set the open and short states and perform the necessary calibrations. Finally, you can set the compensation to DONE to save the performed fixture compensation and turn it on.
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What You'll Learn
Connect the 16196A test fixture to the terminal adapter
To connect the 16196A test fixture to the terminal adapter, follow these steps:
Firstly, ensure you have the correct adapter that fits the measuring instrument. Turn the adapter's 7-mm connector in a counterclockwise direction when viewed from above. Fully screw in the connection sleeve.
The next step is to align the test fixture with the adapter. Position the test fixture gently so that it aligns with the adapter's mount post and 7-mm connector. Once aligned, turn the adapter's 7-mm connector counterclockwise to connect the bottom of the test fixture to the connector.
To ensure a firm connection, use a torque wrench (size: 3/4 inch, torque: 12 lb-in, Keysight part number: 8710-1766) to fasten the adapter's 7-mm connector.
By following these steps, you will securely connect the 16196A test fixture to the terminal adapter, ensuring a stable and reliable connection for your measurements.
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Set the electrical length
To set the electrical length, first, connect the 16196A test fixture to the terminal adapter. Turn the adapter's 7-mm connector in a counterclockwise direction when viewed from above and screw the connection sleeve in fully. Align the text fixture with the adapter's mount post and 7-mm connector and set it gently in place. Now, turn the adapter's 7-mm connector counterclockwise, connecting the bottom of the test fixture with the connector.
Once the test fixture is connected, set the electrical length. Since the electrical length of an exclusive-use test fixture is registered in the E5061B, the necessary electrical length can be set by simply selecting the model number of the test fixture used. It is also possible to input the specified electrical length value. For example, if you use the 16092A fixture, define its electrical length of 3.4 mm by pressing Cal > Fixture Compen > Modify User Fixt.
If the electrical length value of the user fixture is set to 0, Fxtr User is not displayed at the Channel Window even if User is selected at Cal > Fixture Compen > Fixture > User. The fixture electrical length compensation and the Z port extension are only applicable to impedance measurement data and are not applicable to S-parameter and gain-phase T/R measurements.
The recommended fixture compensation method up to a few hundred MHz is the open/short compensation. For measurements at higher frequencies, it is recommended to perform a combination of fixture electrical length compensation and open/short compensation. The open/short compensation eliminates the error factors of the fixture's non-coaxial section. The open/short compensation is only applicable to impedance measurement data and not to S-parameter and gain-phase T/R measurement data.
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Align the test fixture and adapter
To align the test fixture and adapter, follow these steps:
Firstly, it is important to understand the basic setup. The upper portion of the test fixture is connected to a load cell in the crosshead of the testing machine, while the lower portion is connected to the base of the machine. The adapter has two ends: one attached to the test fixture and the other to the load cell or testing machine base. Both ends must be clearly defined.
Now, to begin the alignment process, connect the test fixture to the terminal adapter. For example, if you are using the 16196A test fixture, turn the adapter's 7-mm connector in a counterclockwise direction when viewed from above and screw the connection sleeve in fully.
Next, align the test fixture with the adapter's mount post and connector, ensuring it is securely in place. Turn the adapter's connector in the appropriate direction to connect the bottom of the test fixture. For instance, with the 16196A test fixture, turn the 7-mm connector counterclockwise.
Finally, perform the necessary calibrations and compensations. For instance, with the 16196A test fixture, you would perform open and short calibrations and set the compensation to DONE. This will ensure the accuracy and reliability of your measurements.
By carefully aligning the test fixture and adapter through these steps, you can achieve precise connections and enhance the overall efficiency and accuracy of your testing processes.
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Set the open state
To set the open state of the fixture, follow these steps:
- Connect the E4991-60022 OPEN standard to the 16201A terminal adapter: This terminal adapter is connected to Port 1 of the E5061B.
- Complete the open calibration: Once the open calibration is finished, a checkmark will be displayed next to the Open menu.
- Use the supplied open state to set the open state: Place the open plate on top of the insulator assembly using tweezers, with the protruding surface facing down. Lock the cap in place by turning it to the right.
- Press Cal > Fixture Compen > Compensate > Open: This sets the open state of the fixture.
- Manually define the electrical length: If you are using a fixture whose electrical length is not predefined in the firmware menu, you can manually enter the electrical length value of your fixture and then press Enter. Press Cal > Fixture Compen > Fixture > User.
- Save the fixture compensation: After setting the open state, you can save the fixture compensation by setting the compensation to DONE. This will automatically turn on the fixture compensation (Cal > Fixture Compen > ON).
By following these steps, you can set the open state and configure the necessary settings for measuring fixture electrical length using the E5061B.
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Set the short state
To set the short state when measuring the fixture electrical length with the E5061B, follow these steps:
Firstly, connect the test fixture to the terminal adapter. For example, if you are using the 16196A test fixture, align the fixture with the adapter's mount post and 7-mm connector, and turn the adapter's connector counterclockwise to connect the two.
Next, set the short state by using the open state supplied. Loosen the electrode securing screws so that the shorting bar is caught in the electrodes, then fasten the screws. This will ensure good contact and an accurate measurement.
Now, you can proceed to measure the calibration data for the short state. On the E5061B, click "Short" and then "Done". This will automatically turn on the open/short compensations, and "Comp OS" will be displayed at the Channel Window.
If you are using a fixture whose electrical length is not pre-defined in the firmware menu, you will need to manually define its electrical length. To do this, press "Cal" followed by "Fixture Compen", then "Modify User Fixt". Enter the electrical length value of your fixture and press Enter.
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Frequently asked questions
This is a method to eliminate the error factors of a fixture's non-coaxial section. It is applied in the same way as the Keysight RF Impedance Analyzer.
Connect the 16196A test fixture to the terminal adapter and set the electrical length: turn the adapter's 7-mm connector in a counterclockwise direction when viewed from above and screw the connection sleeve in fully.
If you use the 16092A fixture, for example, define its electrical length of 3.4 mm by pressing Cal > Fixture Compen > Modify User Fixt.
