067-506
The Tektronix 067-506 (aka 067-0506-00) is a constant-amplitude signal generator. The 067-506 was replaced by the 191.
The 067-506 contains a feedback loop that maintains constant RF amplitude at the output connector regardless of small variations in load or internal variations, e.g., as the unit warms up. This is accomplished by using an envelope detector to measure the peak-to-peak output voltage, and using the envelope signal as feedback to set the plate voltage of the Colpitts RF oscillator, thereby controlling its swing. In contrast, instruments like the 190 and SG504 put the envelope detector in an output head so they can offer output voltage that is held constant regardless of losses in cables, filters, etc., whereas the 067-506 is unaware of those losses and cannot compensate for them. The benefit of a 190-type approach is greater if there are unknown losses between the oscillator and the load.
The +450 V power supply in the 067-506 is unregulated. The instrument relies on the RF feedback loop to maintain stability of the RF output voltage with respect to line voltage variation.
Key Specifications
- please add
- Frequency range: 50 kHz fixed, 0.35 − 100 MHz in 7 ranges
- Output: GR-874 connector
Manuals
- Tektronix 067-0506-00 Manual (PDF)
- Tektronix 067-0506-00 Manual (PDF, OCR)
- Tektronix 067-0506-00 Schematic (PDF)
