UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Tektronix 465B Scope

Radio Wrangler · 3rd Jul 2013, 10:01 pm

OK, so you have about 25mV p-p on the vertical plate and such a CRT might be something like 4 volts per division. This would wobble your spot 25/4 milli-divisions so 0.00625 of a division.

This is just a guess at the deflection sensitivity (and it is normally the plate-to-plate differential voltage), but you could easily put a signal in, set it for 1 division peak-to-peak, and measure the plate voltage again. Compare the result to 25mV p-p and you'll really know if the deflection system is wobbling the spot.

David (designed parts of an HP scope in a previous life)

3rd Jul 2013, 10:01 pm	#45
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,874	Re: Tektronix 465B Scope - Some problems. OK, so you have about 25mV p-p on the vertical plate and such a CRT might be something like 4 volts per division. This would wobble your spot 25/4 milli-divisions so 0.00625 of a division. This is just a guess at the deflection sensitivity (and it is normally the plate-to-plate differential voltage), but you could easily put a signal in, set it for 1 division peak-to-peak, and measure the plate voltage again. Compare the result to 25mV p-p and you'll really know if the deflection system is wobbling the spot. David (designed parts of an HP scope in a previous life) __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done