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SunPro Digital Meter info
I have a SunPro Model CP7678 meter. It comes in an orange case. It has
settings for: DC Voltage, DC Current (15A), Resistance, Diode Check, Lo
Tach, Hi Tach (x10), Dwell and Duty Cycle. The Tach and dwell settings
have 4,5,6 and 8 cylinder settings. It is water resistant and will auto-
matically shut itself off after not being used for a few minutes.
I was thinking about getting one of these things for my father for Christ-
mas, and I saw it for sale at Sears for $100, which appears to be the list
price. I got mine on sale a few years ago for ~$55, and Nick told me he
recently bought one on sale in the $60 range.
There are other options as well. As was pointed out by someone else, you
can take advantage of the fact that a standard D'Arsonval (analog) meter
responds to average voltage. By taking a reading of a pulse-width modulat-
ed DC voltage with a standard DC voltmeter and dividing that value by the
peak DC voltage (12V(?)) and then multiplying by 100, you will get the duty-
cycle in per-cent. I noticed in the original EC article that the pictures
showed some Radio Shack digital meter that has duty-cycle as well. I had
not seen this meter in my local store before so I don't know the price.
If you don't need the dwell angle capability (which could also be computed
BTW) either of the two options would be acceptable.