Graticule illumination? - UK Vintage Radio Repair and Restoration Discussion Forum

BulgingCap · 15th May 2017, 3:48 pm

Recently I replaced a blown 6v3 filament bulb 'on' indicator in on of my scopes with an LED. The scale illumination was powered from the same supply. I mused that in nearly 45 years of owning a scope (starting with a Hartley 13A...), and using one at work for much of that time, I have never ever turned up the graticule illumination, but all CRT scopes are fitted with it.
When would it be used?
Regards, BC

Refugee · 15th May 2017, 4:01 pm

Is it not to show the graticule when taking film camera photos?
Obviously this is unheard of these days.

cmjones01 · 15th May 2017, 4:18 pm

It's useful for photos, yes, and also for normal use depending on the lighting conditions and what sort of colour filter, if any, the scope has on the screen. When using a scope in low light I find the graticule illumination especially helpful. Just looking around at the 3 analogue scopes within sight of my desk, I realise I habitually keep the graticule illumination on when I'm using them just to remind myself they're switched on! There isn't always a visible trace, especially if I've got a scope set up to trigger on some particular event, or I'm using a differential input with a big offset.

Chris

Chris

MrBungle · 15th May 2017, 4:55 pm

I think it looks nice and makes it easier to read, at least on Philips scopes:

15th May 2017, 3:48 pm	#1
BulgingCap Pentode Join Date: Apr 2017 Location: South Coast, Western Australia. Posts: 129	Graticule illumination? Recently I replaced a blown 6v3 filament bulb 'on' indicator in on of my scopes with an LED. The scale illumination was powered from the same supply. I mused that in nearly 45 years of owning a scope (starting with a Hartley 13A...), and using one at work for much of that time, I have never ever turned up the graticule illumination, but all CRT scopes are fitted with it. When would it be used? Regards, BC

15th May 2017, 4:01 pm	#2
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: Graticule illumination? Is it not to show the graticule when taking film camera photos? Obviously this is unheard of these days.

15th May 2017, 4:18 pm	#3
cmjones01 Nonode Join Date: Oct 2008 Location: Warsaw, Poland and Cambridge, UK Posts: 2,677	Re: Graticule illumination? It's useful for photos, yes, and also for normal use depending on the lighting conditions and what sort of colour filter, if any, the scope has on the screen. When using a scope in low light I find the graticule illumination especially helpful. Just looking around at the 3 analogue scopes within sight of my desk, I realise I habitually keep the graticule illumination on when I'm using them just to remind myself they're switched on! There isn't always a visible trace, especially if I've got a scope set up to trigger on some particular event, or I'm using a differential input with a big offset. Chris Chris __________________ What's going on in the workshop? http://martin-jones.com/

15th May 2017, 4:55 pm	#4
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Graticule illumination? I think it looks nice and makes it easier to read, at least on Philips scopes: