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#1
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Do 9v batteries historically suck?
Looks like I killed my multimeter by reversing the polarity to a 9V transformer I wired into the meter for a replacement power source. Like I keep 9V batteries around anymore. So I wired up a 150mA 9V transformer to soar and "be free". It worked and then, out of curiosity, I flipped the polarity: Busted, I got the "DUH AWARD" for the evening.. And yet they're still making them, multimeters for 9Volts like they're really still the in-style thing, presumably to getting somewhere. I found a replacement multimeter that uses 2xAAA for power. No more 9V --- As in say Bye-bye, see ya, but sure wouldn't wanna be ya. After ten years, that really fried the wongdoodle in my brainpan when I cooked my old multimeter. The Chinese digital I just replaced it, with another Chinese model, has perhaps a couple newer features I might use -- the usual ohm, wattage, current and amperage -- this new one has a "inductive" (proximity) sensor, e.g. beeps if near a wall outlet that's powered; A backlit screen's new, a hold function and audio continuity the old one had, but wow, now the new one even has a flashlight. The "nice" meters, however, look like they might the blue-toothed interfaced models, for downloading the types of meters they'll interface into a blue-tooth connection and handheld display. Those cost four times what I paid (of course not including a handheld. There's probably one of those out there somewhere, similarly, except for an oscilloscope if I'd looked farther and harder.) |
#2
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Do 9v batteries historically suck?
Flasherly wrote:
Looks like I killed my multimeter by reversing the polarity to a 9V transformer I wired into the meter for a replacement power source. Like I keep 9V batteries around anymore. So I wired up a 150mA 9V transformer to soar and "be free". It worked and then, out of curiosity, I flipped the polarity: Busted, I got the "DUH AWARD" for the evening.. And yet they're still making them, multimeters for 9Volts like they're really still the in-style thing, presumably to getting somewhere. I found a replacement multimeter that uses 2xAAA for power. No more 9V --- As in say Bye-bye, see ya, but sure wouldn't wanna be ya. After ten years, that really fried the wongdoodle in my brainpan when I cooked my old multimeter. The Chinese digital I just replaced it, with another Chinese model, has perhaps a couple newer features I might use -- the usual ohm, wattage, current and amperage -- this new one has a "inductive" (proximity) sensor, e.g. beeps if near a wall outlet that's powered; A backlit screen's new, a hold function and audio continuity the old one had, but wow, now the new one even has a flashlight. The "nice" meters, however, look like they might the blue-toothed interfaced models, for downloading the types of meters they'll interface into a blue-tooth connection and handheld display. Those cost four times what I paid (of course not including a handheld. There's probably one of those out there somewhere, similarly, except for an oscilloscope if I'd looked farther and harder.) There are worse things. They made some multimeters that run off 12V, and the battery is quite quite expensive. At least the 9V battery is cheaper, relatively speaking. I could probably buy twenty 9V batteries for the price of the slim 12V battery. You know that 4000 series CMOS, works up to 15V for VCC, so that's probably a convenient upper limit for a multimeter design :-) The meter might only draw 7mA from its 9V supply, so it does not load the source too heavily. That's when the meter is on the volts range. If the meter has RS232, when the RS232 is plugged in, the meter will stay on, so you can do extended measurement sessions. I have one multimeter that has optoisolated RS232, and the meter can probe mains, without danger of blowing up the computer recording the readings via RS232. Paul |
#3
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Do 9v batteries historically suck?
On Wed, 27 Jan 2021 01:05:15 -0500, Paul
wrote: There are worse things. They made some multimeters that run off 12V, and the battery is quite quite expensive. At least the 9V battery is cheaper, relatively speaking. I could probably buy twenty 9V batteries for the price of the slim 12V battery. You know that 4000 series CMOS, works up to 15V for VCC, so that's probably a convenient upper limit for a multimeter design :-) The meter might only draw 7mA from its 9V supply, so it does not load the source too heavily. That's when the meter is on the volts range. If the meter has RS232, when the RS232 is plugged in, the meter will stay on, so you can do extended measurement sessions. I have one multimeter that has optoisolated RS232, and the meter can probe mains, without danger of blowing up the computer recording the readings via RS232. I've never seen a 2xAAA configuration in a DMM (or a 2xAA for that matter), but I'm flush with good Eneloop AAs and decent Tenergy AAA brand. Rechargeables may be a gamble, backlighting, audio, and what else. If they'll bring it up initially, though, that's good, as I don't really mind putting in fresh batteries between reasonably short time usages. My last didn't have auto-ranging or back lighting, so the new is not bad for a basic unit and abilities I didn't if ever use on the one I fried. No 9V. No more. At least I got that much accomplished (in a week delivery time (found in US stock) when the below, Aneng M118A, arrives $14/US total). https://www.ebay.com/itm/Digital-Mul...-Manual-Tester -Volt-Range-AC-S3E1/373440256975?hash=item56f2c61bcf:g:t9wAAOSwK5tgD99 m AAA 1.5V x 2 Current Range: 0.01uA-10A DC Voltage Range: 0.1mV-600V AC Voltage Range: 1mV-600V Display: 6000 counts Test/Measurement Functions: AC Current, AC Voltage, DC Current, DC Voltage, Resistance, Volt, NCV, Ohm, AC/DC Features: Auto Power Off, Auto-Ranging, Backlight, Battery Door Access, Over Range Protection, True RMS Flash Light, Back light, Auto-power Off NCV test, TRUE-RMS, Data Hold Sample Rate: 3 times per second |
#4
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Do 9v batteries historically suck?
On 2021-01-27 12:05 a.m., Paul wrote:
Flasherly wrote: Looks like I killed my multimeter by reversing the polarity to a 9V transformer I wired into the meter for a replacement power source. Like I keep 9V batteries around anymore.Â* So I wired up a 150mA 9V transformer to soar and "be free".Â* It worked and then, out of curiosity, I flipped the polarity: Busted, I got the "DUH AWARD" for the evening.. And yet they're still making them, multimeters for 9Volts like they're really still the in-style thing, presumably to getting somewhere. I found a replacement multimeter that uses 2xAAA for power.Â* No more 9V --- As in say Bye-bye, see ya, but sure wouldn't wanna be ya. After ten years, that really fried the wongdoodle in my brainpan when I cooked my old multimeter. The Chinese digital I just replaced it, with another Chinese model, has perhaps a couple newer features I might use -- the usual ohm, wattage, current and amperage -- this new one has a "inductive" (proximity) sensor, e.g. beeps if near a wall outlet that's powered;Â* A backlit screen's new, a hold function and audio continuity the old one had, but wow, now the new one even has a flashlight. The "nice" meters, however, look like they might the blue-toothed interfaced models, for downloading the types of meters they'll interface into a blue-tooth connection and handheld display.Â* Those cost four times what I paid (of course not including a handheld. There's probably one of those out there somewhere, similarly, except for an oscilloscope if I'd looked farther and harder.) There are worse things. They made some multimeters that run off 12V, and the battery is quite quite expensive. At least the 9V battery is cheaper, relatively speaking. I could probably buy twenty 9V batteries for the price of the slim 12V battery. You know that 4000 series CMOS, works up to 15V for VCC, so that's probably a convenient upper limit for a multimeter design :-) The meter might only draw 7mA from its 9V supply, so it does not load the source too heavily. That's when the meter is on the volts range. If the meter has RS232, when the RS232 is plugged in, the meter will stay on, so you can do extended measurement sessions. I have one multimeter that has optoisolated RS232, and the meter can probe mains, without danger of blowing up the computer recording the readings via RS232. Â*Â* Paul Waybackwhen, I was having problems wit a 250 ton Carrier water chiller so I called the company that had the maintenance contract for the machine and they sent one of their technicians. The machine ran on 600 volts 3 phase AC and drew 247 amps full load, anyway he was checking various things with his Fluke meter and then we had to turn the unit on for some live measurements. I was standing about 8 feet away when I heard this really large Bang and saw a puff of smoke where the meter was in his hand. Well the meter literally disappeared, Sorta like ' I dream of Genie disappeared', Miraculously he was not injured at all. Well he said he had forgotten to change the meter from the ohms scale to the AC voltage scale. Rene |
#5
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Do 9v batteries historically suck?
Rene Lamontagne wrote:
Waybackwhen, I was having problems wit a 250 ton Carrier water chiller so I called the company that had the maintenance contract for the machine and they sent one of their technicians. The machine ran on 600 volts 3 phase AC and drew 247 amps full load, anyway he was checking various things with his Fluke meter and then we had to turn the unit on for some live measurements. I was standing about 8 feet away when I heard this really large Bang and saw a puff of smoke where the meter was in his hand. Well the meter literally disappeared, Sorta like ' I dream of Genie disappeared', Miraculously he was not injured at all. Well he said he had forgotten to change the meter from the ohms scale to the AC voltage scale. Rene I take it after this, you stood more than 8 feet away :-) By any chance, did the guy have orange hair ? https://upload.wikimedia.org/wikiped...8Muppet%29.jpg Paul |
#6
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Do 9v batteries historically suck?
On 2021-01-27 3:00 p.m., Paul wrote:
Rene Lamontagne wrote: Waybackwhen, I was having problems wit a 250 ton Carrier water chiller so I called the company that had the maintenance contract for the machine and they sent one of their technicians. TheÂ* machine ran on 600 volts 3 phaseÂ* AC and drew 247 amps full load, anyway he was checking various things with his Fluke meter and then we had to turn the unit on for some live measurements. I was standing about 8 feet away when I heard this really large Bang and saw a puff of smoke where the meter was in his hand. Well the meter literally disappeared, Sorta likeÂ* ' I dream of Genie disappeared', MiraculouslyÂ* he was not injured at all. Well he said he had forgotten to change the meter from the ohms scale to the AC voltage scale. Rene I take it after this, you stood more than 8 feet away :-) By any chance, did the guy have orange hair ? https://upload.wikimedia.org/wikiped...8Muppet%29.jpg Â*Â* Paul Can't remember, but a couple years later I had to reset a 600 volt 1600 amp breaker , it had tripped due to shorted lead in a motor control center, When the electricians had made repairs I went down to the electrical room and cranked up that breaker and hit the start button. I was standing as far away as I could., About two and a half feet, Well, that breaker slammed in and out again in an instant, as there was still a short to ground on the system, it also tripped the main 6000 amp breaker which was only about 3 feet away in the same panel. That was the time I would have liked 8 foot or longer arms, the noise was like a ton of dynamite, And a huge flash as the arc chutes did their job.. After the electricians found charred buss bar insulators and replaced them with spares and properly meggered the system I had to fire in that breaker again, Talk about apprehension! I stood as far away from that breaker as humanly possible, with an outstretched arm and hit the start button, This time everything went smoothy. (Whew). Rene |
#7
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Do 9v batteries historically suck?
On Wed, 27 Jan 2021 10:54:11 -0600, Rene Lamontagne
wrote: Waybackwhen, I was having problems wit a 250 ton Carrier water chiller so I called the company that had the maintenance contract for the machine and they sent one of their technicians. The machine ran on 600 volts 3 phase AC and drew 247 amps full load, anyway he was checking various things with his Fluke meter and then we had to turn the unit on for some live measurements. I was standing about 8 feet away when I heard this really large Bang and saw a puff of smoke where the meter was in his hand. Well the meter literally disappeared, Sorta like ' I dream of Genie disappeared', Miraculously he was not injured at all. Well he said he had forgotten to change the meter from the ohms scale to the AC voltage scale. Knew a team, mostly two sometimes a three-man crew, over time who worked the 3-phase supply transformers that supplied a generator room and initially branched to a 20 acre complex. Well enough to see them on their occasional breaks while converning the grid rounds. I'd hear their talk of overtime and salaries, their wives and families who were happily so provisioned, whereupon winding down to climb back into the trucks, perhaps a mention of how seldom they saw them. I might have wondered if their senior technicians, like those of us in the complex, were also permitted to walk away, which they all did, and let the people do, those with a I behind their job title, which they all did at least initially for some to favor more than others, (later along for inasmuch as little as possible of) what they too once did before assuming the titles suffixed by a II or III. A serious issue no doubt for one who watches a DMM vaporize in his hand, should then he have to no alternative but to look forward to remaining indefinitely on hazardous duty. |
#8
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Do 9v batteries historically suck?
Flasherly wrote in part:
Looks like I killed my multimeter by reversing the polarity to a 9V transformer I wired into the meter for a replacement power source. Like I keep 9V batteries around anymore. So I wired up a 150mA 9V I don't think 9V batteries are going away anytime soon. I've never seen a residential smoke detector with any other. In mine, plain heavyduty (MnO-Zn) last longer than alkalines. Sure, 9V are old and most devices no longer need the higher voltage. Current capacity (mAh) has become more important. -- Robert |
#9
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Do 9v batteries historically suck?
On 2021-01-27 3:00 p.m., Paul wrote:
Rene Lamontagne wrote: Waybackwhen, I was having problems wit a 250 ton Carrier water chiller so I called the company that had the maintenance contract for the machine and they sent one of their technicians. TheÂ* machine ran on 600 volts 3 phaseÂ* AC and drew 247 amps full load, anyway he was checking various things with his Fluke meter and then we had to turn the unit on for some live measurements. I was standing about 8 feet away when I heard this really large Bang and saw a puff of smoke where the meter was in his hand. Well the meter literally disappeared, Sorta likeÂ* ' I dream of Genie disappeared', MiraculouslyÂ* he was not injured at all. Well he said he had forgotten to change the meter from the ohms scale to the AC voltage scale. Rene I take it after this, you stood more than 8 feet away :-) By any chance, did the guy have orange hair ? https://upload.wikimedia.org/wikiped...8Muppet%29.jpg Â*Â* Paul Forgot to mention, No, Trump wasn't there. Rene |
#10
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Do 9v batteries historically suck?
On Wed, 27 Jan 2021 03:59:25 -0500, Flasherly
wrote: https://www.ebay.com/itm/Digital-Mul...-Manual-Tester -Volt-Range-AC-S3E1/373440256975?hash=item56f2c61bcf:g:t9wAAOSwK5tgD99 m The above totally sucks, as do most. But I did see, also, at least one Ebay seller with the full-factory, Chinese gloss advertisement spanning several very attractive HTML pages to favorably highlight selling the M118A usages. A mistaken link I managed not to reacquire. The four red mode switches below the 600-unit display, or rather touch-sensors, however, may yet be of concern. As with many invertible wonders, there's an underlying linkage to be found between PCB touch-sensors and corresponding facial silicon button assigned to enduser functionality. I've personally run into a designs employing a "plastic shaft" implemented, between the aforementioned, such that a shaft counterpoint disservices the PCB's touch-sensor into being unfit for too hard and abrasive usage, ultimately, to prematurely destroy sensor or inordinately render a PCB practically dysfunctional. Sometimes, though, a disassembly may present rectifications. With an intelligent battery charger I was unable to make adequate compensations to adjust for the inferior shaft design, whereas with an atomic clock's PCB touch sensors and plastic-post linkages, the posts in addiction comprised a secondary function to mechanical PCB switches. A latter instance I was, at least for another year or so usage over as much as a decade total, to prolong its life (by removing the posts for finger-pressure contact at the switches). The charger is relegated to now stuck at a 200mA power-up default stasis, although actually optimal to a nature of charging characteristics, (accounted design intent not to be rendered wholly inoperable);- whereas a replaced atomic clock, indicative yet of another like La Crosse design, which turned out, after all, one of significant overall original faults and inoperable design since then mechanically redesigned to account for prior deficiency. I have not felt as yet warranted a teardown on the clock*, although I will be curious, with the DMM, as to what's up with those red, probably mode switches, and what's exactly behind their implementation. ** Lunar and weather station display models in the largest screen display factor LaCrosse present offers. * A first-generation (AA/AAA) charger of which comprised only a couple brand models at the time available, over and shortly after initial advancements to first-generation battery design technology. Similar "intelligent" chargers, at present, so-called conditioners, appear widely varied in intent across no less as many brandmakes incident to their production. |
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