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#22
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Doug McLaren wrote:
In article FQ7vc.259$vK4.176@newsfe5-win, Kyle2 wrote: | A cheap digital one from Maplin or RS will be just as accurate, save loads | by not paying for a name. If you're on a tight budget, these things are hard to beat -- http://www.harborfreight.com/cpi/cta...70&pricetype=S Yes, three bucks. They won't hold a candle to a Fluke, but for doing simple voltages or resistances, they're hard to beat. They're accurate (at least the ones I've tested) within 1 or 2%, at least for DC and AC voltage (I don't expect them to do accurate RMS readings on non sinusoidal signals, however) and resistances. They're cheap enough that you can dedicate them to a given operation -- you need to know the voltage on your power battery all the time? No problem -- just slap one of these on it. Personally, I own like ten of these things, scattered throughout the house and car, and a few better multi-meters for when I need them. Right! They even come with the 9v battery included and they have a transistor test function, to boot. When you spend 3 dollars on a DMM, you're not looking for precision results. And you don't need a precision meter for most measurements. As a secondary meter, these 3 dollar things cannot be beat. When I needed to do 6 simultaneous measurements ( a DC-DC converter I made with dual outputs - I needed to measure voltage and current on the input, and voltage and current on both outputs) I bought 4 of them. They were more accurate than I thought they would be - and more accurate than I needed. |
#23
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Doug McLaren wrote:
In article FQ7vc.259$vK4.176@newsfe5-win, Kyle2 wrote: | A cheap digital one from Maplin or RS will be just as accurate, save loads | by not paying for a name. If you're on a tight budget, these things are hard to beat -- http://www.harborfreight.com/cpi/cta...70&pricetype=S Yes, three bucks. They won't hold a candle to a Fluke, but for doing simple voltages or resistances, they're hard to beat. They're accurate (at least the ones I've tested) within 1 or 2%, at least for DC and AC voltage (I don't expect them to do accurate RMS readings on non sinusoidal signals, however) and resistances. They're cheap enough that you can dedicate them to a given operation -- you need to know the voltage on your power battery all the time? No problem -- just slap one of these on it. Personally, I own like ten of these things, scattered throughout the house and car, and a few better multi-meters for when I need them. Right! They even come with the 9v battery included and they have a transistor test function, to boot. When you spend 3 dollars on a DMM, you're not looking for precision results. And you don't need a precision meter for most measurements. As a secondary meter, these 3 dollar things cannot be beat. When I needed to do 6 simultaneous measurements ( a DC-DC converter I made with dual outputs - I needed to measure voltage and current on the input, and voltage and current on both outputs) I bought 4 of them. They were more accurate than I thought they would be - and more accurate than I needed. |
#24
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Hi Jim
Yes, I also prefer the Fluke meters. I own a bench and handheld model. They have a lifetime warranty and are a good investment new or used. Many good models available on ebay from the big tech sellers at a good price. judy James wrote: Fluke's DMMs do cost much more than generic ones. They guarantee accuracy that the others can't touch. I've always been amused that Radio Shack and many other inexpensive DMMs don't publish accuracy specifications. If you want something for relative measurements (peaking, etc) and hobby use, you have a wider field available. If you use it for a living and it *has* to work - well, my Fluke 87 has served *me* wonderfully well. But modern IC technology has certainly made a lot of capability available for little cost elsewhere! Jim WB9SYN/6 (Not affiliated with Fluke) |
#25
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Hi Jim
Yes, I also prefer the Fluke meters. I own a bench and handheld model. They have a lifetime warranty and are a good investment new or used. Many good models available on ebay from the big tech sellers at a good price. judy James wrote: Fluke's DMMs do cost much more than generic ones. They guarantee accuracy that the others can't touch. I've always been amused that Radio Shack and many other inexpensive DMMs don't publish accuracy specifications. If you want something for relative measurements (peaking, etc) and hobby use, you have a wider field available. If you use it for a living and it *has* to work - well, my Fluke 87 has served *me* wonderfully well. But modern IC technology has certainly made a lot of capability available for little cost elsewhere! Jim WB9SYN/6 (Not affiliated with Fluke) |
#26
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I am considering purchasing a Fluke meter to do some
alignments & repairs here. Can anyone reccomend a Fluke meter model or anothere brand model? Clint- I like the idea of having a couple of those cheap meters. I keep one in my brief case and one I take with me on trips. For the shop, I wanted something I could depend on, so back in about 1980 I purchased a Fluke 8020A handheld digital multimeter. Soon after that the display darkened. I purchased an upgraded display, installed it myself, and have had no other problems since then. Three years ago I bought a Fluke 8012A bench model digital multimeter at a Hamfest for $40. It looked rough and was missing its power cord and probes. With just probes and a new cord, it appears to be working perfectly. Comparing it with the old 8020A, readings of various voltages and precision resistors were identical, except for a 0.01 volt difference when reading a 13.8 volt power supply. I know that the 8020A has never been calibrated since leaving the factory. About a year later I bought a Fluke 8050A bench model digital multimeter in non-working condition, for $35. This model has one more digit of resolution than the other two meters, and has true RMS on AC. The problem turned out to be that it had dead internal batteries, and required the batteries to act as a voltage regulator when operated on AC. Some slightly smaller batteries from Radio Shack made it work. Again, it appears to be working perfectly. Voltage and resistance readings agree with both other meters. (I forget which one of the three was 0.01 volt off on 13.8!) The moral of the story is that here are three meters approaching 25 years of age, that have maintained their accuracy in spite of rough handling over the years. I would recommend any of the three models if you can find a used one. Of course, you may find that someone has mis-calibrated it, so you need some assurance it is still accurate. Perhaps you can scrape together a handful of precision resistors and use them as a "standard". If you want a more modern meter, the latest Flukes offer auto-ranging. The early versions sacrificed some accuracy and were slow, but I understand more recent models are better. However, I'm not willing to spend the money for auto-ranging when my old fixed-range meters are so good! 73, Fred, K4DII |
#27
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I am considering purchasing a Fluke meter to do some
alignments & repairs here. Can anyone reccomend a Fluke meter model or anothere brand model? Clint- I like the idea of having a couple of those cheap meters. I keep one in my brief case and one I take with me on trips. For the shop, I wanted something I could depend on, so back in about 1980 I purchased a Fluke 8020A handheld digital multimeter. Soon after that the display darkened. I purchased an upgraded display, installed it myself, and have had no other problems since then. Three years ago I bought a Fluke 8012A bench model digital multimeter at a Hamfest for $40. It looked rough and was missing its power cord and probes. With just probes and a new cord, it appears to be working perfectly. Comparing it with the old 8020A, readings of various voltages and precision resistors were identical, except for a 0.01 volt difference when reading a 13.8 volt power supply. I know that the 8020A has never been calibrated since leaving the factory. About a year later I bought a Fluke 8050A bench model digital multimeter in non-working condition, for $35. This model has one more digit of resolution than the other two meters, and has true RMS on AC. The problem turned out to be that it had dead internal batteries, and required the batteries to act as a voltage regulator when operated on AC. Some slightly smaller batteries from Radio Shack made it work. Again, it appears to be working perfectly. Voltage and resistance readings agree with both other meters. (I forget which one of the three was 0.01 volt off on 13.8!) The moral of the story is that here are three meters approaching 25 years of age, that have maintained their accuracy in spite of rough handling over the years. I would recommend any of the three models if you can find a used one. Of course, you may find that someone has mis-calibrated it, so you need some assurance it is still accurate. Perhaps you can scrape together a handful of precision resistors and use them as a "standard". If you want a more modern meter, the latest Flukes offer auto-ranging. The early versions sacrificed some accuracy and were slow, but I understand more recent models are better. However, I'm not willing to spend the money for auto-ranging when my old fixed-range meters are so good! 73, Fred, K4DII |
#28
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#29
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#30
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On Wed, 2 Jun 2004 11:15:29 -0400, "Eike Lantzsch, ZP6CGE"
wrote: I prefer a Fluke anyway. This is why: [snip] They are good. For what it is worth, I bought a big Fluke 5 1/2 digit 8520A ten or more years back used. It is still going strong. I hardly ever use some of its fancy features, but I do use 4-wire resistance sometimes. It is hardly portable (rack mount size) but great on the bench. Here's a story about its resistance to abuse: At some flea market I once acquired some strange glass encapsulated resistors. They were at least an inch long and very high resistance (100Mohm or more as I recall). It occured to me I could use one or two to make a nice HV probe. So I built a divider inside a plastic tube. I found a HV dc/dc supply in my junk that I think was in the 1-2 kv range. I turned it on, and tried measuring with my new probe plugged into my Fluke. The plastic tube was clear, and to by horror, when I touched the probe on the HV the glass resistor lit up. (I'm guessing they were gas filled to do this on purpose, but I really have no clue why it happened -- the voltage should not have jumped the gap in air.) So as I see this happening in the probe, I hear the Fluke make strange unpleasant clicking noises. I look over at my favorite meter and the display is now in Klingon. With great sadness I power cycle the meter and to my amazement the meter looks fine. I have never seen any indication that anything was permanently injured. Try that with a cheapo meter. Not that I have anything against the cheap ones -- I have several. |
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