USB voltage and current meter

NO Retail Box. And if it doesn’t differ much from the tester, it’s generally wonderful. 1 x USB Current And Voltage Tester However, the Chinese forget to do this. At the maximum current, they promise a voltage drop on the meter of 0.2V. It can measure the current and voltage of the power supply equpment with USB port. They don’t exist in life. Well, stress, of course. And… oh-pa. And again the tricks of the mail. The device is small, which can be seen directly from the photo. And there, as you know, there should not be more than 5.2V. Yeah, they didn’t lie, they were sold.

USB voltage and current meter

Better, of course, 3.5. But if you remember that this is just a pakazometer, there is no particular minus. Okay. The tester is needed here because it has a greater resolution and accuracy than the PSU indicators. Packed Safely in Bubble Bag. But if necessary, there will be a small display meter for all kinds of experiments at hand. Again, we will use an adjustable PSU and a tester. Plug it in and look. Don’t pay attention to the shadows running across the indicator – this is a lag when the refresh rate of the display and the video camera are superimposed. Switches between volts and amps independently. When viewed through the transparent plastic details are visible. What we actually have: There are few of them. 🙂 Under the output connector there is a diode that protects against reverse polarity. I will not check the upper limit. Because pulling it off is not a problem – a matter of seconds. Plus – it is usable. If there was an LCD, I would eat half or three times less. Error range: voltage Full-scale voltage drop:200mV. It’s just a display. Checked by connecting the mouse, smart. If you ever thought about how much this or that device consumes from USB, remember about the device the next time you visit BIC. Taught by the previous meter, we check the lower voltage from which this device will work. Here is one of those moments. What they promise: We learn the order of values ​​- already good. This is where simplicity turned out to be worse than theft. Must have, yes What we need. Bude, whoever wishes, can break the case and build it into some 5-volt charger. Unpacked, look. What is set up at the factory, then we will use it. At low voltage, a difference in the brightness of the indicators is visible. The work of USB devices on your computer does not interfere. And again, the protective film on the indicators is visible, which must be removed after installation on the board. At the same time, we catch the Chinese in a lie: the last digit is occupied by the symbol of the current value – current or voltage. Package Included: Transparent plastic is both a housing and a light filter for indicators. This moment, in fact, is not too critical. Here is such a hundred-ruble horseradish. Received with a difference of 1 day. Quite sour. Arrived. It really starts with a voltage of 3.1V. Considering that on normal charging it can be 5.2V, we will unscrew the voltage more. The device is simple as a brick. For I do not aim to finish off the device. And the current will increase. I don’t want to break the case – it is glued around the entire perimeter. Less than a 4-port hub. The voltage and current will be displayed circularly. What – did not see. We left China 3 days apart. Now let’s see how much the meter itself consumes. Well, what can I say? Pretty normal readings. Shows the current consumed by the device connected to the USB. And there is no need to mess with wires, cut cables and perform other excesses. So, about 28mA. And then
it turns https://jiji.ng/port-harcourt/computers-and-laptops out that with the promised 0.2V falling on the device at 3A, we will get a device that refused to charge at the output. Its purpose is purely to freeze USB. Simple and works. small sized, easy and convenient to carry.
I don’t know when it appeared on BIK, but I caught my eye just recently. Designed for inquisitive minds. Of the minuses – you can call floating values. Connect to an adjustable PSU and turn the knob. Summary. A hundred rubles is not money, and you can always find a place for a device in a drawer. And here the consumption is increased by LED indicators. Naturally, I connected. In the measurement cycle, the numbers jump several times. Firstly, in domestic use, it is simply not necessary to measure something on USB with high accuracy. Although, on common sense, what for should we measure fans? Tea, in everyday life around everything is electronics, not electromechanics. Size: 5.2cm x 1.5cm x 3.4cm. The order was broken into two parcels. Let’s check the measurement accuracy. Moreover, 100 rubles. Workable range: U=3.5 – 7.0V, A=0 – 3A. At the same time, let’s check where it measures the voltage – at its input or directly at the load? Oh, on load! It’s honest. Oops. Brand new and high quality. Well, I threw in the order. Which by no means allows us to enjoy watching the promised "1 mA". It may remain 4.8V or even less. WTF. Naturally, red light through blue glass distorts the native color of the indicators. In order to determine the suitability of the port on the computer for charging; see the current given by the powerbank; determine how much the tablet eats in charging mode – good! Lack of any settings, buttons, etc. will not be stressful. Plug and play, no extra power supply needed. Interference from the brushed motor clogged the power rail so much that the device simply turned off incredibly. What can I say? Shows something. And something else. For no tuning elements were found on the board. So he has a resolution of 10 units for both voltage and current. Workable temperature: 0 – 60℃. Resolution: voltage 10mV, current 1mA. As a result of digging on the table for the subject of “what else to measure?” a USB fan was found. Moreover, the Chinese decided that the current consumed by the observer would be about 2 times more interesting than the voltage. 🙂 Otherwise, how else can you explain such temporary display parameters? And there are two digits after the decimal point.