Measurement techniques (7):

The test methods described so far in this series apply only to low-frequeney (LF) equipment. In circuits carrying high-frequency (HF) signals, the effects of Ihe measuring equipment become an important factor. First of all, of course, the test instruments used musr be designed for HF measurements. Also, unless suitable measures are taken, tests may result in reflections and radiation of HF energy, which will invalidate the test results.