If you're building/soldering things up "immediately" or not, you can use/go back to RS for 2 ea. 1uf 250V metal film non-polarized caps and wire them in series.
This series combination makes for a 0.5uf 500V in place of the 2.2uf. The two 250V equal valued 1uf caps will just equally split the total stator's voltage, minus the diode drop (Vd = 0.6'ish and is negligible) of course
. e.g., if V stator peak is 400Vp, ea cap only sees 200Vp ea., but the total across the two as seen by the connected meter is still 400Vp obviously.
Those are at RS
http://www.radioshack.com/product/in...lue=RadioShack
Metal film caps in general are better suited to high/higher voltages(1000's) anyway and will last much much longer then will the alum electrolytic's!!
You'll want then to adj. the time constant (R*C) to the same[or close to and obviously neglecting Rin(10M typ) of the meter] as the 2.2uf and 1M ohm circuit, which is 2.2 sec's.
It's also NOT imperative to have the time constant at 2.2 sec either. This is a ball park number and you can slide around it somewhat. So, use 2 ea. 10M ohm from RS in parallel for a combined value of 5M ohms in place of the 1M ohm.
0.5uf and 5M ohm gives a time constant of 2.5 sec's.........close enough!! Another 1/4 watt and replacing a fat ole 2.2uf 250V alum elect. w two 1uf MF's, w/o a doubt fit np.......Looks like a bus could go in that box.
http://www.radioshack.com/product/in...watt+resistors
Personally, and when and if ya can, I'd recommend you use/invest in a good ole fluke(87, 89, whatever) and use their "peak" features, it works perfect and was designed exactly for these types of measurements. They are plenty/more than fast enough, more accurate even IMO.
The flukes I've used have been anyway, both fluke's peak reading features in fact i use were spot on in every merc/honda spec's in the book i've ever used them for on my engines, and as compared to also using a tek digital capture O-scope measuring the same sig. peak levels at the same time, both meter and scope spot on each other and w the manual's expected spec'd values.....GL
