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The '''Tektronix 491''' is a spectrum analyzer with a frequency range of 10 MHz to 40 GHz. The minimum resolution bandwidth is 1 kHz, and provides measurement resolution proportional to the frequency accuracy or span. | The '''Tektronix 491''' is a spectrum analyzer with a frequency range of 10 MHz to 40 GHz. The minimum resolution bandwidth is 1 kHz, and provides measurement resolution proportional to the frequency accuracy or span. | ||
Front panel inputs/outputs are: RF INPUT (A) [[BNC connector]] (50Ω, 10 MHz to 275 MHz); RF INPUT (B) [[N connector]] (50Ω, 275 MHz to 2 GHz); WAVEGUIDE (C) [[N connector]] (50Ω | Front panel inputs/outputs are: RF INPUT (A) [[BNC connector]] (50Ω, 10 MHz to 275 MHz); RF INPUT (B) [[N connector]] (50Ω, 275 MHz to 2 GHz); WAVEGUIDE (C) [[N connector]] (50Ω, 12.4 GHz to 40 GHz); and a dual function 1 MHz MARKERS OUT [[BNC connector]] (With the INT REF FREQ in the ON position a 1 MHz marker outputs to this connector. With the INT REF FREQ in the OFF position EXT REF FREQ IN “same” [[BNC connector]] accepts an external signal between 1 MHz and 5 MHz (1 to 5 V peak to peak) applied to the connector becomes the reference frequency for the phase lock operation). | ||
Rear panel inputs/outputs are: TRIG IN [[BNC connector]] (20 Hz to 100 kHz, ≥0.2V); SAW OUT [[BNC connector]] (75mV/div); and RECORDER [[BNC connector]] (≥4 mV/div of displayed signal in LIN mode, DC-coupled, into 600Ω load impedance). | Rear panel inputs/outputs are: TRIG IN [[BNC connector]] (20 Hz to 100 kHz, ≥0.2V); SAW OUT [[BNC connector]] (75mV/div); and RECORDER [[BNC connector]] (≥4 mV/div of displayed signal in LIN mode, DC-coupled, into 600Ω load impedance). | ||