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Integrating spheres, even on ebay, go for silly money but there is a way......... I wanted to get the spectrum of an NVIS compatible illuminated switch and actually got pretty reasonable correlation

Hi Ed, ? I've actually made an integrating sphere. ?Actually, it's an integrating box, because I couldn't get a round shape quickly and easily, but I suppose I could have picked up an old globe at a

The 7603 uses a linear power supply, not a switcher. So no ticking. Craig

Dan, I think you can find the sensor pieces to make a reasonably-priced setup with good spectral matching, but the tricky part is the integration of the total bulb output, on a "hobby" budget.

Of course, this is one of those subjects, like religion, sex, drugs, rock-and-roll and politics that I hesitate to respond to here as there are some fanatics about incandescent light bulbs in our

Okay, but I did not think the posts about the Tek 475 had anything to do with Bob's computer, so I would have never guessed this.

Hi Jeff, Two separate members of this group requested one manual each.... I'm sure they can see this note as they also saw my original post. I am trying my best to pay the generosity I have received

You've got a dead 7603 with no lights. Definitely look at the low voltages first. Check the 0.15A (150mA) fuse, F855, just because its 'filament' is so delicate it can easily become disconnected from

Does it make a ticking sound - like 1/sec? You may need to put your ear close to the cover to hear it. If so, it's something in the PSU - rectifier board, LV board, inverter - likely a shorted

That diagnosis gives no information regarding the location of any HV fault. If the -3kV is not present, the fault could either be the HV transformer, something in the string of components associated

You probably meant .3 * 18, or 54 W? It's not entirely fair to think of 18 V in both cases since the voltage drop Vce will increase dramatically when the line is short circuited. In the 465 the

That model, if the graticule lights work you got juice to the Xfmr. Other lights are a different story. If you get absolutely nothing, turn it on and see if the blades of the power plug read infinity

Hi, my name is Jim and I'm a Tek-aholic. ("Hi, Jim.") Long time lurker (about a year and a half), first time poster. My latest Tek project is a completely dead 7603 that I bought on the 'Bay. I did

This is OT, but I just have to say I happened to stop by the Fremont Costco today, and stumbled upon some amazing deals on certain types of LED bulbs, like six-packs of PAR-xx/xxW equivalent spots for

One thing that wasn't said on this thread ( unless I missed it) is that these scopes can be LETHAL !!! If you get "stung" by CRT high voltage (-1450) if it doesn't kill you, you'll be one hurtin

True, and I've made some of them. However, as I remember it, the voltage across the sense resistors should be the VBE drop of the trigger transistor. I'm also going on general theory without looking

Hello Dimitri, To you and all, first of all, apologies if my answer is maybe mission the history (your previous messages) but I'm writing from my phone and couldn't let this go. Itseems no one

Should help, but that jitter might be settings. If B sweep has an auto trigger, turn it off. Also switch it to DC coupling and turn off any low or high filters. Adjust the trigger level slowly and at

I meant Bob's computer monitor. If LCD which most are these days, some are not quite perfect. My 23" on my good old PC, I think it is an Acer has great viewing angle, about like a CRT. But my laptop

There were people on here recently looking for donations for the cost of scanning a bunch of manuals and making PDFs out if them. I would have kicked in a few bucks but I do not have a credit card, so