Re: Searching for a Tek 7000 series scope
Hi Dennis,toggle quoted messageShow quoted text
Keep in mind that the 7904A timebase is not be calibrated at 200 ps/div (see the note on the front panel above the trigger source controls). The 7B15 is really intended for use in the 7104 with a 7B10 timebase, so it's minimum time/div is 200 ps/div with 10x zoom. However, because it's such a fast timebase, triggering on that signal is easy. The 7B92A timebase will not cleanly trigger on the same signal. It will trigger, but it's much uglier.
The signal generator in question is my HP 8664A, 10 kHz-3 GHz, set for 1.1 GHz carrier. The frequency response dies quickly beyond that.
According to my calculation, the ~520 ps period shown originally at 200 ps/div corresponds to roughly 1.93 GHz as you mentioned. At 1.1 GHz, the period should be just slightly under 1 ns. If you look at the pictures I added to the album, you'll note that at 500 ps/div it's showing the correct period, but at 200 ps/div the signal seems to be getting compressed in the time domain. It should be quite a few more divisions at 1.1 GHz and sweep speed combo.
Still, it's very good performance and a testament to how well engineered this scope is. I can get a stable trigger up to about 1.43 GHz, at which point the amplitude is rolling off very fast.
On Sat, Apr 20, 2019 at 03:53 PM, Dennis Tillman W7PF wrote: