The LMR Master is a field-portable unit designed to operate in the rigors of the test environment. In order to ensure measurement accuracy, RF calibration (OSLT, for example) must be performed prior to making a measurement in the field.
The LMR Master has no field‑adjustable components. The RF calibration components, however, are crucial to the integrity of the calibration and must 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 (DUT) 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 Measurement Guides). Use of a typical laboratory cable to extend the LMR 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.
Anritsu recommends an annual calibration and performance verification of the LMR Master and the OSL calibration components and InstaCal module by local Anritsu Service Centers.
The LMR Master is self‑calibrating and has no field‑adjustable components. The OSL calibration components are crucial to the integrity of the calibration. As a result, they must be verified periodically to ensure performance conformity. This is especially important if the OSL calibration components have been accidentally dropped or over‑torqued. Contact information for Anritsu Service Centers is available at http://www.anritsu.com/contact-us.