28-03-2018, 10:37 AM
Jeffrey, to my mind, the IBA sample has the most comprehensive range of markings so could be used for just about everything without being confusing whereas two of the BBC samples don't even extend to sync pulse tip level when doing pulse and bar measurements.
Your suggestion of switchable range settings gives me an idea, though. If the graticule is engraved on both sides to prevent parallax error, is it possible that such a switchable waveform monitor could have a small number of individual graticules, the appropriate one for each range being selected by edge illumination of that one only?
A story that I know I've told before - but not here, I don't think - concerns a visit arranged by our college to the Crystal Palace transmitter in December 1963. We had a Tektronix 'scope at college - a 465, I think - with a delayed timebase that we used to look at the Insertion Test Signals but, beside the Control Panel at Crystal Palace sat a Marconi 'scope that, apparently, cost £3,000 - considerably more than the Tek.
It just had a vague milky green screen and somebody (not me!) asked the obvious question. "Oh, it goes like that sometimes!" came the reply - accompanied by a fist smashing heavily into the side of the cabinet, whereupon the trace bounced onto the screen!
Ah! BBC Engineering at its finest!
Your suggestion of switchable range settings gives me an idea, though. If the graticule is engraved on both sides to prevent parallax error, is it possible that such a switchable waveform monitor could have a small number of individual graticules, the appropriate one for each range being selected by edge illumination of that one only?
A story that I know I've told before - but not here, I don't think - concerns a visit arranged by our college to the Crystal Palace transmitter in December 1963. We had a Tektronix 'scope at college - a 465, I think - with a delayed timebase that we used to look at the Insertion Test Signals but, beside the Control Panel at Crystal Palace sat a Marconi 'scope that, apparently, cost £3,000 - considerably more than the Tek.
It just had a vague milky green screen and somebody (not me!) asked the obvious question. "Oh, it goes like that sometimes!" came the reply - accompanied by a fist smashing heavily into the side of the cabinet, whereupon the trace bounced onto the screen!
Ah! BBC Engineering at its finest!
