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067-0938-00: Difference between revisions
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It is used for measuring the distortion (spectral impurity) of an oscillator by eliminating the fundamental frequency of the oscillator (primarily the [[SG505]]), so the residual harmonics can be measured. | It is used for measuring the distortion (spectral impurity) of an oscillator by eliminating the fundamental frequency of the oscillator (primarily the [[SG505]]), so the residual harmonics can be measured. | ||
The circuit topology is a passive double-T RC notch filter with a precision 600 Ω load and a 60 dB attenuator. The module has no connections to the TM500 mainframe, requiring no power supply. | |||
{{BeginSpecs}} | |||
{{Spec|Notch frequency | 10 Hz, 20 Hz, 100 Hz, 1 kHz, 10 kHz, 20 kHz, 50 kHz, 100 kHz; ±2% }} | |||
{{Spec|Notch depth| ≥100 dB at 10 Hz and 20 Hz, ≥60 dB otherwise }} | |||
{{EndSpecs}} | |||
Load impedance must be ≥1 MΩ ±5% // ≤75 pF including cabling and spectrum analyzer input capacitance. Input source impedance must be 600 Ω ±5%. | |||
==Links== | ==Links== | ||