The Tek 475 is analog, with a CRT screen, so the tools for LCD screens will probably not work. The intensity knob may be turned down too low (as Bob mentions), but on my 475, if I turn down the intensity until I can barely see the trace on just the A sweep, and then go to Mix, I can still see the A trace along with the B trace. But when I turn it down further, the B trace is still visible as the A disappears. There may be a dirty Mix switch or some other switch.
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On 6/22/2018 8:27 AM, Jeff Urban wrote:
On Thu, Jun 21, 2018 at 02:29 pm, Bob Albert wrote:
Is the intensity set too low?
Bob
Sounds like you are not seeing the left side of the trace. Couple possible reasons for this, one is that the brightness or pedestal on your monitor is set too low. There are monitor test programs for this, as it is hard to tell just where black is black but none of the grays are black. One such program is called ntest.exe, which is totally stand alone, would run off anything, like a CD or stick or whatever. One of the patterns is exactly for that and says adjust until you see some particular block in the pattern. That should eliminate any black clipping.
Another possibility is if you have an edge lit LCD monitor. As the viewing angle changes vertically in those, the brightness changes. This effect varies, some models are better/worse than others. Some are terrible and you only get a limited range or it does all kinds of funky crap like show a negative image or all the color disappears if you are too low or high, things like that.
The one I got - ntest.exe, is from Nokia. If you can't find a suitable program I can upload it or you can hit me up with an email and I can send it as an attachment in a reply.
