PIN diodes are sometimes used as input protection devices for high frequency test probes.
2.
:: : : : : : : The test would be very much like standard hearing frequency tests, where they play ( or don't play ) sounds at various frequencies, asking the person to click the button if they hear it.
3.
In a situation, where circuit loading rather than high frequency is the real problem, a variety of small-geometry, high impedance probes can be used, sometimes including an amplifier to boost the tiny amount of energy extracted from the circuit to a level that allows it to be measured by available high-frequency test equipment.
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