Connecting to a DUT

The waveguide flange of the RF interface at the front panel enables you to connect the R&S SZU to the DUT directly, or to mount a test port adapter before connecting to the DUT. See "Waveguide test port adapters" for the connecting options.

Note:Note:

To avoid possible wear due to frequent connection directly to the waveguide flange, we recommend that you use a test port adapter.

If an adapter shows any wear, you can exchange it. See "Waveguide test port adapters" for order information on the available WR15 adapters.

For mounting the adapter to the R&S SZU, see "To mount a test port adapter".

To connect the DUT to the R&S SZU directly
  1. Inspect the waveguide flange connector of the R&S SZU visually to check that it is clean, undamaged and mechanically compatible.

    Thus, you prevent insertion loss and mismatch, and even premature wear of the connectors.

    Note:Note:

    If the visual inspection shows that the waveguide flange requires cleaning, see "Cleaning".

  2. Inspect the waveguide port of the DUT accordingly, see step 1.

  3. Carefully align the pins of the DUT to the holes of the waveguide port of the R&S SZU until they match.

  4. Carefully fit the waveguide connectors into each other.

  5. To tighten the waveguide connectors:

    1. Align the four included screws of the waveguide port to the screw threads of the opposite connector.

    2. Torque the screws to the specified limit of 0.58 Nm using the R&S ZCTW calibrated torque wrench. See Figure "Recommended torque wrench R&S ZCTW".

    Excessive tightening can damage the connectors. Too loose tightening can lead to inaccurate measurement results.

To connect the DUT to the waveguide-to-waveguide test port adapter

The precision waveguide flange of the waveguide-to-waveguide adapter provides two pins and two holes for aligning the DUT, see "Waveguide-to-waveguide adapter".

  1. Mount the test port adapter to the R&S SZU as described in "To mount a test port adapter".

  2. To connect the DUT to the test port adapter, proceed the same way as described in To connect the DUT to the R&S SZU directly, step 1 to step 5.

To connect the DUT to the waveguide-to-V test port adapter

The precision waveguide flange of the waveguide-to-V adapter provides a 1.85 mm coaxial socket for connecting the DUT.

  1. Inspect the coaxial connector of the test port adapter visually to check that it is clean, undamaged and mechanically compatible.

    Thus, you prevent insertion loss and mismatch, and even premature wear of the connectors.

    Note:Note:

    If the visual inspection shows that the connector requires cleaning, see the application note 1MA99. The application note provides information on the means you can use and how to clean the thread and the inside of the connector.

    The application note also provides

  2. Select a high-quality shielded RF cable that matches the connector type.

    See "Cable selection and electromagnetic interference (EMI)".

  3. Inspect the connector of the cable visually as described in step step 1.

  4. Carefully align the connector of the cable and the RF output connector of the test port adapter along a common axis.

  5. Mate the connectors along the common axis until the male pin of the cable connector engages with the female socket of the instrument connector.

  6. Turn the nut of the outer cable connector until the connectors are coupled.

  7. Tighten the nut as follows:

    1. Use a torque wrench suitable for the type of connector.

    2. Hold the opposite connector part stationary with a spanner.

    3. Tighten the nut to the specified limit of 0.9 Nm.

    Excessive tightening can damage the connectors. Too loose tightening can lead to inaccurate measurement results.