VNA Master preventive maintenance consists of cleaning the unit and inspecting and cleaning the RF connector on the instrument and all accessories. Clean the VNA Master with a soft, lint‑free cloth dampened with water or water and a mild cleaning solution.
Caution
To avoid damaging the display and case, do not use solvents or abrasive cleaners.
Clean the RF connectors and center pins with a cotton swab dampened with denatured alcohol. Visually inspect the connectors. The fingers of N(f) and K(f) connectors and the pins of N(m) and K(m) connectors should be unbroken and uniform in appearance. If you are unsure whether the connectors are good, gauge the connectors to confirm that their dimensions are correct. Type K(f) test port connectors are available on some models with Option 11.
Visually inspect the test port cables. The test port cable should be uniform in appearance, not stretched, kinked, dented, or broken.
The VNA Master is a field portable unit operating in the rigors of the test environment. In order to ensure measurement accuracy, RF calibration (OSLT or SSLT, for example) must be performed prior to making a measurement in the field.
The VNA Master has no field‑adjustable components. The RF (OSLT, SSLT, and SSST) calibration components, however, are crucial to the integrity of the calibration and should be periodically verified to ensure their performance. This is especially important if the components have been dropped or over‑torqued.
Note
For best calibration results (compensation for all measurement uncertainties), ensure that the calibration is performed at the end of the test port or optional extension cable; that is, at the same point that the device that is to be tested will be connected.
Caution
For best results, use an Anritsu phase stable Test Port Extension Cable, such as those listed in the Technical Data Sheet for your instrument (refer to Supplemental Documentation). Use of a typical laboratory cable to extend the VNA Master test port to the device under test, or any bending of the cable subsequent to the OSL or OSLT calibration, may cause uncompensated phase reflections inside the cable. Reflections of this type cause measurement errors, which are more pronounced at higher frequencies.
Annual Verification
Anritsu recommends an annual calibration and performance verification of the VNA Master and the calibration components by local Anritsu service centers. Anritsu service centers are listed our web site at anritsu.com/contact-us.