株式会社ノイズ研究所

I have selected “50 ohm” on the voltage meter correction facility provided on the INS-4020(4040) in order to measure the output waveform by using the AT-810/00-00017A, voltage setting is allowed up to 1.98kV (3.96 kV) only. Why does not the INS reach to its maximum 2.05kV (4.1 kV)?

NoiseKen

The INS voltage meter only matches the actual output if the appropriate correction provided by the equipment firmware is selected.  The default selection is 53.5 ohm termination: 53.5 ohm (builtin-terminator)/(53.5 ohm characteristic impedance of the coaxial line + 53.5 ohm built-in terminator). 

The use of AT-810/00-00017A attenuator means that the coaxial line is terminated by the input impedance of the attenuator, therefore, the numerator and denominator should change to 50 and 53.5 + 50, respectively.  The maximum allowable setting on the INS voltage meter when using either attenuator should be decreased accordingly.

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