Multimeter with min/max hold for DV***

[kenimpzoom]

I have a Micronta True RMS Multimeter that has a min/max memory function on DC or AC volts.<br /><br />Can I use this as a DVA meter for checking stator and switchbox?<br /><br />Thanks,<br /><br />Ken

 

[denniz]

Re: Multimeter with min/max hold for DV***

I dont think so I had to spend the bucks and order one from merc. It wasnt that much $60-75. It was the only one I could find with a dva scale.

 

[lonewolf5347]

Re: Multimeter with min/max hold for DV***

ken e mail me lonewolf5347@cs.com

 

[almost retired again]

Re: Multimeter with min/max hold for DV***

Hi Kenimpzoom,<br /> Yes just multiply the RMS reading that you get by 1.414 this will convert it to a peak value.<br />hope this helps

 

[seahorse5]

Re: Multimeter with min/max hold for DV***

To check out an RMS meter, put the leads in a wall socket and check the reading. A peak-reading voltage adapter used for OB ignition systems reads about 160volts.

 

[almost retired again]

Re: Multimeter with min/max hold for DV***

Hi Kenimpzoom,<br />Seahorse is right with his readings. But what that peak reading meater is doing is full wave rectifing the AC to give you a peak reading DC value. If you multiply 120 volts AC by the constant value of 1.414 you will get 169 volts peak. The differance of 9 volts that he is talking about is a voltage drop that is lost across the rectifier assembly. Thats why when using a fluke meter you have to have a peak reading adapter. the rectifier that converts your reading is located in the adapter. In the CD-77 the rectifier assembly is in the meter case, and thats all the meter reads is Peak values.<br />I stand by my first post you can use an AC meter that reads RMS (root mean square) and multiply the value to get peak values. What you end up with may be a little different from the values the manual is asking for, but it will certainly let a person know if the charge coils, or senser coils are putting out. Remember that ALL voltages that come out from under the flywheel are AC and must be converted to read DC values.<br />In fact, if a person had the values of the diods and filters they could make thier own peak reading adapter by using common parts from Radio Shack.<br />Sorry about the long post, but I've uised this method lots as I don't like to take expensive meters to the water, and give them a chance for thier first swimming lesson.<br />Hope this expains my first post

 

[kenimpzoom]

Re: Multimeter with min/max hold for DV***

Almost,<br /><br />Thanks for clearing things up. The way I see it, electronic parts either are working, or they are not working. Having "weak" electronic parts is rare. In other words, as long as the thing it putting out something, it probably is working.<br /><br />I checked my stator with my RMS voltmeter on AC scale and it gave 120 volts. Multiply that by 1.414 and you get 170 volts. Pretty darn close to the 180 that the book says I should be getting.<br /><br />Ken

 

[almost retired again]

Re: Multimeter with min/max hold for DV***

Hello again Kneeyimpzoom,<br /> I don't think that I would go so far as to say as long as it's putting out something it's worhing. The readings should be pretty close to the readings that the manual calls for. However if you are trying to read the trigger, or sensor voltages they won't show much, but should be better than a volt or two. It dosn't require a very high positive voltage to cause those SCR's to open thier gates, somewhere around 2 or 4 volts.<br />I sure am glad that I finaly got someone to try this. It will save some bucks for those that arn't in the buisness, as most part time mechanics don't need to buy an expensive meter to do most minor trouble-shooting, and repairs.<br />I'm fairly knowledgable of electrical ckts. as I taught Basic electricity, and electronics for 4 years, but that was many years ago.<br />Good Luck