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Tektronix 7B80 time base for 7000 series oscilloscopes
The 7B80 Delayed Time Base Plug-In is recommended for use with 7700, 7800, and 7900 Mainframes to provide optimum bandwidth / sweep-speed compatibility, but may also be used in any slower 7000-Series Mainframe. Calibrated Time Base: 1 ns to 5 s/div with 1.5% accuracy (50 ns to 0.5 s/div) Triggering to 400MHz Variable Trigger Holdoff Peak-to-peak Auto Triggering