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Multimeter w/ Duty Cycle

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grantbow's picture
Lafayette, CA
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1989 300E

Any recommendations for an inexpensive and reliable multimeter that includes duty cycle and maybe frequency measurements? I heard one from Sears is popular.

A quick search shows a Craftsman model 82139 does duty cycles for $30.

I started looking for oscilloscope options after reading http://www.qsl.net/wd1v/scopefaq/ but didn't find a reasonable option for under $200 unless I considered used units which I don't have time to research right now. Maybe later for that.

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cth350's picture
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1963 300SE
Re: Multimeter w/ Duty Cycle

Cool URL. Thx.

I have a labjack that I picked up, but to get it into fully usable shape, you're still talking 200$.

There was an article in the star almost a decade ago that talked about using a basic analog scope and building a pickup to read the primary of the ignition system. The mid-80s cars and later don't need that kind of pickup presumably, but having a used scope off of ebay is always an option.

The sears meters I have used are all good at the basics. A trip to a store to eyeball the meter usually doesn't hurt.

-CTH

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Sokoloff's picture
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Re: Multimeter w/ Duty Cycle

I found out that a dwell meter measures duty cycle. You just need to convert it to a 100 scale. I needed one for my 560SL and the dwell meter did the trick and I didn't have to buy anything.

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

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grantbow's picture
Lafayette, CA
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Re: Multimeter w/ Duty Cycle

I was looking through Amazon's best sellers. This one is a little more expensive at $55 but it has both frequency and duty cycle along with sound, humidity, temp and light.

http://www.amazon.com/Digital-Multimeter-Enviormental-Function-RSR/dp/B0007Z0TAY/

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wbain's picture
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Re: Multimeter w/ Duty Cycle

Sokoloff;132335 wrote:
I found out that a dwell meter measures duty cycle. You just need to convert it to a 100 scale. I needed one for my 560SL and the dwell meter did the trick and I didn't have to buy anything.

Len, you have to be careful that the dwell meter doesn't load the circuit too much. DVCM's are typically high impedance input while dwell meteres are very low, i.e. 1000 ohms per volt instead of 11 meg.

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1965 220S, 1999 Volvo V70, 2002 FORD Crown Vic, 1972 350SL Euro 4 speed.

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