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The component shown above is a resistor that is specifically designed for good high frequency and other performance characteristics. This resistor is made by Barth Electronics and the features that make it work well for high frequency measurements and equipment include:

• The resistor is not trimmed. It's value is held to within 1% by tight control of the resistivity of the material from which it is made. Trimming, especially laser trimming, of resistors often compromises their high frequency performance due to either the capacitance across the trimming cut or the additional inductance caused by the longer conductive path resulting from the cut.
• The substrate upon which the resistive coating is placed is very smooth. This leads to better control of the resistor's parameters.
• The resistor has a low voltage coefficient of resistance (resistance is not affected much by applied voltage). This makes this resistor well suited for applications where high peak voltages are encountered, such as occurs with ESD. Normal resistors can be non-linear at high peak voltages and even change their values permanently after a short pulse (nanoseconds to microseconds) of peak power that is 10X or more of the resistor's average power rating.

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