Need to measure 35-40V . when connecting blk to ground, red to 12V. And wht to the source i want to measure it reads " - - ". Like out of range?
1513301
Try tying he white o he red. I bought a few of these nifty voltmeters and they're pretty accurate. I know the instructions say white to sourcebut trust me tie white and res together and you wont miss. I have 3 and thinking about ordering a few more for the price. Some malaysian electronics are pretty good. Suspect it's in this tablet.
764382
Hi Mike,my power supply adaptor is 12 volt,2.5 Amp.part # 18778.the +pos is on the inside of the post plug & the - negative ground is on the outside of the post plug plug that plugs into your 12 volt port.
1679672
The ohm rage for the gauge is 33 to 240 ohms so it should read in the correct range it is a negative ground unit
234503
Does anybody knows what is the voltage output of the adapter cord for the BG2040? (it can be seen on the adapter), I have two of them and have to decide.Thanks
964405
yes, the unit has DC Settings of 1.5, 6.0, 9.0, 12.0---so you would put in the range just higher than your battery voltage and read the actual voltage output. It should be at least 90% of the labeled voltage to work properly, and you would need to ignore the color of the lights except when the battery label voltage is exactly the same as one of settings on the DC dial. Jim B
697615
I have 18 volt not sure what the BL1815 means. But i have thrown mine out, its awful absolutely useless!
566631
Radio Shack or most other stores/websites that have a good electronics section. The AC adapter that came with mine doesn't even say Black and Decker on it. I used a label-maker to label it "booster". The input is 120 volt, 60Hz AC of course, the output is 12 volts, 500mA, center pin positive. It's vital that you the polarity (center pin positive) and amperage (500 mA or more) is correct on the power adapter, or damage could occur! I measured it with a micrometer, the outer diameter of the plug is 5.5mm, the inner diameter is 2.5mm. So, the Radioshack catalog #273-357 paired with the Adaptaplug N (catalog #273-345) should work. With the adaptaplug, you flip the tip around to change polarity. Radio Shack or most other stores/websites that have a good electronics section. The AC adapter that came with mine doesn't even say Black and Decker on it. I used a label-maker to label it "booster". The input is 120 volt, 60Hz AC of course, the output is 12 volts, 500mA, center pin positive. It's vital that you the polarity (center pin positive) and amperage (500 mA or more) is correct on the power adapter, or damage could occur! I measured it with a micrometer, the outer diameter of the plug is 5.5mm, the inner diameter is 2.5mm. So, the Radioshack catalog #273-357 paired with... » Read More Radio Shack or most other stores/websites that have a good electronics section. The AC adapter that came with mine doesn't even say Black and Decker on it. I used a label-maker to label it "booster". The input is 120 volt, 60Hz AC of course, the output is 12 volts, 500mA, center pin positive. It's vital that you the polarity (center pin positive) and amperage (500 mA or more) is correct on the power adapter, or damage could occur! I measured it with a micrometer, the outer diameter of the plug is 5.5mm, the inner diameter is 2.5mm. So, the Radioshack catalog #273-357 paired with the Adaptaplug N (catalog #273-345) should work. With the adaptaplug, you flip the tip around to change polarity. « Show Less
1636676
Mine has a yellow wire but there are no standard color and changing it based on what they have in stock (many low end Chinese manufacturers will do this) ... it should be red-black-X .. red is volts, black is ground and the 3rd wire is current .. you can check this by using a DMM on ohms mode and looking for a practical short (less than 5 ohms) from ground to the green wire and that will verify that it is the current
1742606
Hook-up as follows:Red to 120vacBlack to 120vacWhite to neutralGreen or bare copper to ground/bondingGood Luck and Happy New Year!
910585
I went to look on the fuse to see if it had any numbers written on them. They have some numbers embossed on one of the ends. They are hard to read if you don't have enough light and hold them the right way. But the number reads F15AL 250V, for anyone who has the same question. (I am the same person that asked the question, but on a friend's account since I can't answer my own question.)
1230346
I don't have any experience with your keyboard, but usually you'll find a sticker near the plug that tells you what voltage and amperage it needs from its adapter. Also, if there's a little diagram that looks kind of like a "C" wrapped around a dot, pay attention to which one is labelled positive and which is negative. If you can get that info, you can just buy an adapter that matches that description and you're in business. Good hunting!
511886
Use a multimeter. Be sure to set the multimeter to DC volts. place the black lead into the black lead of the battery connector and the red lead into the red lead of the battery connector. Now you can read the voltage. RadioShack sells very inexpensive multimeters or perhaps you could buy one on Amazon.
1581334
Do you want the relative voltage between D- and D+, or the voltage on each pin to ground? Either way, I only measured resistance between the data pins and not their voltage to determine that they were not shorted together like I needed. Otherwise I don't know the data pin voltages. My guess is a voltage bias between 0 and 5v or just 0.
1064911
Yes, I had the same problem. The two smaller wires are the supply voltage for the meter itself. Red is positive, black is negative. I used 5 Volts DC to power mine. The bigger wires are red, blue and black. Red is the voltage sense, blue and black are for the current sense. Black should be connected directly to ground. The blue then becomes the ground for whatever device you are sensing the current on. So, the ground side of the load goes into the blue wire (then through a shunt resistor) and then out of the black wire to ground. Hope this helps! :)
353901
How did you try to measure 24 volts? If you used 2 twelve volt batteries in series make sure they were connected one + lead to the other - lead. Or try to measure 3 nine volt batteries snapped together. You should get 27 volts. I think there is a calibration pot on the back of the meter. It is very small and you will need a jewelers screwdriver to adjust it. Make sure the red lead goes to the + termingal of the battery. Try again and let me know. You could have a bad batch of meters. Mine worked very will on my power supply that goes up to 27 volts. One last thing...are the 24 volt batteries you are measuring good batteries? The meter might be telling you that they are not. Hope this was useful. Also be aware that all meters have a percentage of error. Some are + - .1% + - .01%. No matter how expensive the meter it will have error tho very small. The smaller the error, the larger the price. These cheap but beautiful meters are good enough for battery monitoring. I wouldnt use them to build a computer power supply.
1782938
Put a good multimeter on the out put leads and spin it. you will read DC volts with NO ac COMPONENT. ww
957781
My guess is the reds are your 120v wires. On mine the blue go to 170v B+ and the white go to 6.3v tube heater supply. Try the red on 120 and test with a meter to be sure your blues and whites are not crossed.