067-0938-00
The Tektronix 067-0938-00 is a TM500 Notch Filter Calibration Fixture plug-in for the TM500 system.
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.
Key Specifications
| Notch frequency | 10 Hz, 20 Hz, 100 Hz, 1 kHz, 10 kHz, 20 kHz, 50 kHz, 100 kHz; ±2% |
|---|---|
| Notch depth | ≥100 dB at 10 Hz and 20 Hz, ≥60 dB otherwise |
Load impedance must be ≥1 MΩ ±5% // ≤75 pF including cabling and spectrum analyzer input capacitance. Input source impedance must be 600 Ω ±5%.
