Battery Testing
@Ing
The scope probe setting Input attenuation (x1 and x10) do not affect your reading of frequency. It could cause a wave distortion if the compensation is not properly adjusted, but that is something else to learn and setup. I always taught to set the vert level so you had a waveform that takes at least 1/2 the screen. Adjust timing (if scope has the range) for 1 or 2 full cycles of the wave being examined, this way you get the greatest accuracy. Count divs from 1st zero crossing point two the third (full cycle for clean wave) or to 2nd zero crossing for 1/2 wave, then the full cycle is tx2. I like the zero crossing points best to start because if you go peak to peak and are harmonic rich, it is very error prone. If you have an SG or any clean sine source, practice with this. Remember this is a lost art with new scopes and cursors.
@All
Battery test went very well. Two 8.4 NiMh @ 800mAHr we fully and properly charged before start. Each battery would run the 18, leds and charging batteries for one full hour before leds started to dim, point where I felt they should be brighter for use. Switched batts, full brightness another hour, again switched. Did this 7 times (8) hours. Full led light for each hour an battery recovered. Now should batts need any topping a solar cell would work. This may be something useful. More details later.
@Ing
The scope probe setting Input attenuation (x1 and x10) do not affect your reading of frequency. It could cause a wave distortion if the compensation is not properly adjusted, but that is something else to learn and setup. I always taught to set the vert level so you had a waveform that takes at least 1/2 the screen. Adjust timing (if scope has the range) for 1 or 2 full cycles of the wave being examined, this way you get the greatest accuracy. Count divs from 1st zero crossing point two the third (full cycle for clean wave) or to 2nd zero crossing for 1/2 wave, then the full cycle is tx2. I like the zero crossing points best to start because if you go peak to peak and are harmonic rich, it is very error prone. If you have an SG or any clean sine source, practice with this. Remember this is a lost art with new scopes and cursors.
@All
Battery test went very well. Two 8.4 NiMh @ 800mAHr we fully and properly charged before start. Each battery would run the 18, leds and charging batteries for one full hour before leds started to dim, point where I felt they should be brighter for use. Switched batts, full brightness another hour, again switched. Did this 7 times (8) hours. Full led light for each hour an battery recovered. Now should batts need any topping a solar cell would work. This may be something useful. More details later.
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