I always thought my oscilloscope was old and broken when i saw those multiple wave forms. Hmm. interesting.

Those scopeshots showing overlapping waveforms are telling you that your signal isn't strictly repeating, but is changing in timing and/or voltage, and the scope is "multiple triggering" on different parts of the unstable waveform. If you can't get it to settle down by adjusting the Trigger level, type and/or slope, the way to get a stable picture is to use the Single Shot mode of the scope. When you see something like that, press the Single button at top right on the Rigol z-box and the scope should capture one triggered sweep with no overlaps. If you have a deep memory set in the Acquire menu you can then scroll around, zoom, use cursors, display measurements etc. on the stopped trace. Then you can press Single again and the scope will likely trigger on a different part of the unstable waveform. To see how the signal varies in time and voltage, select a slower timebase so you see a bunch of cycles, even overlapping. Then press the Single button and the single sweep should show the variations in timing etc. See the attached scopeshots for examples where I did this to display some irregular signals.

And it really is easier and better to use a USB thumbdrive and the "print" button to make your screenshots with the Rigol z-box.  Unless maybe you do all your forum work on your phone or tablet where you take a picture and then post directly from there, I guess. Seems a waste though since the actual screensaves have much more detail, are smaller filesized and have other advantages like always being in perfect focus and contrast....

(Yes, both these scopeshots were made using the NRMRE circuit which is the topic of this thread.)


As far as the relay buzzer circuit is concerned, what happens is that the relay isn't fully opening/closing because the coil is connected to the Normally Closed switch contacts, so as soon as the coil is energized the NC contacts start to open, and as soon as they start to open, a tiny arc forms at the contacts __because the collapsing field of the coil wants to keep current flowing in the same direction as before_. This arc produces high frequency RF noise just like the spark gap in traditional Tesla coil systems. It also dissipates energy. A little later in the cycle when the contacts open further the arc goes out and the rest of the stored energy in the coil's magnetic field produces a ringdown. If you could get rid of that arc you'd see less high frequency components and a higher voltage spike (because the energy isn't lost in an arc).  Some of these miniature relays have a reverse-biased diode already built in across the coil, this is not the kind of relay you want for this device. Putting a small value ceramic capacitor across the switch contacts can help to get rid of the little arc, which is good if you want the relay to last a long time but bad if you need the RF noise from the arc. The arc will eventually cause degradation of the contacts (they are usually made of extremely tough metal like tungsten) due to erosion and buildup of combustion products. The contacts can even weld themselves closed. You can use a diode and capacitor in the usual way to store up the energy in the coil's spikes, and then discharge that capacitor wherever you might find a use for the energy.

 

Those scopeshots showing overlapping waveforms are telling you that your signal isn't strictly repeating, but is changing in timing and/or voltage, and the scope is "multiple triggering" on different parts of the unstable waveform.

Geeze my hunch was close, kinda. Thanks

Getting parts of the device to work.

1 neon is a 90volt spark gap arrestor
2 moth relays are in series via a NC relay contact No not used
2 Relay series resistor about 30 R to tune to about 50hz or 60 depending on Iron core
3 scope shots of wave forms around relay coils ect
4 Anyone have any ideas ?