On Mon, 24 Dec 2018 08:09:11 -0500 Gene Heskett <ghesk...@shentel.net> wrote:
> On Monday 24 December 2018 04:26:05 Joe wrote: > > > > > There is normally a real Nyquist bandwidth quoted somewhere in the > > small print. I used to repair and calibrate Hitachi scopes for a > > while, until everyone stopped using them. > > I wonder why, Joe. My V-1065 still works well enough to measure > frequency at a 1% accuracy, and its now pushing 35yo. In a pinch I've > looked at the output sample of an old analogue tv transmitter to > adjust the modulation depth when the monitor was bonkers, it was > actually usable at 180 mhz. I used to see about three or four of the 665/1065 series a week, mostly ten years old with mains switcher problems. Mostly routine fixing, after the initial pain of troubleshooting a mains switcher. Capacitors, mostly. Even the high-ripple ones will only run so long before they dry up. Then over about six months, it dropped off to nothing, and we never saw any more. I assume oscilloscope use had dropped off enough that people could just put a dead one in a cupboard wand say 'we'll get it fixed if we ever need it'. Fortunately, oscilloscopes were a minor sideline, so I didn't run out of work. The company still has a 1085, which I use occasionally. At home, I have a 35-yo Kikusui, and a temperamental Tek 465B of uncertain age, but older than that. -- Joe
