Fluke 15B uses 2x 1.5V AA supply.Nice, and the Fluke 17B doesn't cost much more and has temperature measurement as well, which can be useful. I have already a good benchtop multimeter with connection to a PC for data logging, so I think this would be a good choice then.
440mV @ 0.14mA
Fast beep too. :-+
If the test voltage was "high" but was severely current limited would it damage the components? Obviously if you apply 7v to a led you'll blow it, but only if you're assuming its not current limited, which I presume the multimeter would be? Just wondering as that may change how you read the specs (I.e. "Up to 3v test"). No idea, but curious as to what the answer would be.I think the current limitation doesn't help, if the component has a high input resistance. There are a lot of microcontrollers with high impedance inputs that are rated for 3.6 V max. Might be not a problem if the input has ESD protection and the current flows to the positive supply rail (assuming you are measuring from the input to GND), which then powers the microcontroller and the voltage drops, but there are components without ESD protection. And many components might not like it, if you apply -7 V, which you don't think about when doing continuity tests.
FYI Fluke 15B has the 17B functionality, just missing the buttons as far as I know.Fluke 15B uses 2x 1.5V AA supply.Nice, and the Fluke 17B doesn't cost much more and has temperature measurement as well, which can be useful. I have already a good benchtop multimeter with connection to a PC for data logging, so I think this would be a good choice then.
440mV @ 0.14mA
Fast beep too. :-+
You may know the BM257 is very popular here and others can verify those readings I posted with the Greenlee DM-200A.Thanks, looks good, too. And it has a serial connection for data logging with a PC as well, which is usually much more expensive. Maybe they don't spend as much for marketing than Fluke, so they can sell it cheaper. The new BM257s has true RMS and capacity measurement.
Anyone with a Fluke 87? I can't believe that it is that worse and the datasheet is not clear about the voltage used in continuity mode.My Fluke 87V puts out 7.30V and 1.00mA in continuity mode. I have an original 87 (series 1) as well, but currently it has no battery. If you want that info, I can do it later or tomorrow.
MyMetraport 32 S has 0.6xx Volts in Continuity
Many, many years ago, I built a continuity tester from a kit (which may have been from Audio Amateur), but can no longer find any info for it. The tester still works fine, and I frequently use it. Its PCB is labeled PE301A, uses an LM324 with a buzzer, is powered by a 9V battery, fits nicely in a 2.75"×4" black plastic box, has Voc = ~ 215mV, and Isc = ~ 270µA. If there's enough interest, I could try to generate a schematic from the PCB.
It would be a nice project idea to build an 0.1 Volts Continuity Tester. One could safely measure on a PCB which has semiconductors already installed.
Many, many years ago, I built a continuity tester from a kit (which may have been from Audio Amateur), but can no longer find any info for it. The tester still works fine, and I frequently use it. Its PCB is labeled PE301A, uses an LM324 with a buzzer, is powered by a 9V battery, fits nicely in a 2.75"×4" black plastic box, has Voc = ~ 215mV, and Isc = ~ 270µA. If there's enough interest, I could try to generate a schematic from the PCB.
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My Fluke 87V puts out 7.30V and 1.00mA in continuity mode. I have an original 87 (series 1) as well, but currently it has no battery. If you want that info, I can do it later or tomorrow.
I'm pretty sure I could build something like that by myself. But would I have the spare time? I would gues: No!Google finds a lot of circuits when searching for the right words. Add "OpAmp" in your search query and you'll get more advanced circuits with modern OpAmps like the LM741 ;D :
Anyone tried a zener to reduce the voltage?
Anyone tried a zener to reduce the voltage?
But a zener clamps the voltage by becoming a conductor once the zener voltage is reached. So you will be measuring the conductivity of the zener instead of the DUT.
I have an original 87 (series 1) as well, but currently it has no battery.Original 87 puts out 1.240V and roughly 300uA when set to continuity.
Fluke 15B uses 2x 1.5V AA supply.Who would have thought the Fluke 15B would have fared so well against supposedly much better meters. :-DMM
440mV @ 0.14mA
Fast beep too. :-+
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Anyone with a Fluke 87? I can't believe that it is that worse and the datasheet is not clear about the voltage used in continuity mode.My Fluke 87V puts out 7.30V and 1.00mA in continuity mode. I have an original 87 (series 1) as well, but currently it has no battery. If you want that info, I can do it later or tomorrow.
7.3 V is really bad. Thanks
It'll be current-limited so you'll only see 7.3V if you measure it with a 10 MOhm impedance multimeter. Try it on a 10 Ohm resistor and see what the voltage is.
If the test voltage was "high" but was severely current limited would it damage the components? Obviously if you apply 7v to a led you'll blow it, but only if you're assuming its not current limited, which I presume the multimeter would be? Just wondering as that may change how you read the specs (I.e. "Up to 3v test"). No idea, but curious as to what the answer would be.
The Fluke 87 is meant for industry! You're supposed to toss that thing in your toolbox and shove those probes up a VFD's proverbial behind while standing in a pool of oil and piss. Industrial drive electronics will take 7V probe voltage easily, they'll also take 70V actually. It's designed for its use case, I'm not quite sure why it became popular among hobbyists.
on the other hand the 15b+ is more geared towards bench use I think.
The Fluke 87 is meant for industry! You're supposed to toss that thing in your toolbox and shove those probes up a VFD's proverbial behind while standing in a pool of oil and piss. Industrial drive electronics will take 7V probe voltage easily, they'll also take 70V actually. It's designed for its use case, I'm not quite sure why it became popular among hobbyists.
So that's why it's 20000 counts - so you can measure industrial drive electronics to 4.5 digits in the rain. :-+on the other hand the 15b+ is more geared towards bench use I think.
Unlike a bench meter, which would never need that accuracy.
The Fluke 87 is meant for industry! You're supposed to toss that thing in your toolbox and shove those probes up a VFD's proverbial behind while standing in a pool of oil and piss. Industrial drive electronics will take 7V probe voltage easily, they'll also take 70V actually. It's designed for its use case, I'm not quite sure why it became popular among hobbyists.
On the other hand the 15b+ is more geared towards bench use I think.