USB-tester (USB Tester, Power Doctor) measures the capacitance pauerbanka, analyze how charged smartphones and other gadgets to measure how much energy it takes to fully charge, and see how the fast charging Quick Charge.
I "in the collection" has more than a dozen testers, and it looks like I found the almost perfect.
ATORCH USB tester A-TH-USB is sold complete with a load of half / 3A and costs $ 6.71 with free shipping.
The tester is able to measure the following parameters:
Voltage 3.60V - 32.5V with gradation 0.01V;
Current 0.01A - 5.00A to 0.01A gradation;
Power 0 - 299.999W with gradation 0.001W;
Energy 0 - 999999 Wh with gradation 0.001Wh;
Charge 0 - 999999 mAh with gradation 1 mAh;
Charging Time 0 - 999: 59: 59 with 1 second gradation;
load resistance 0 - 999 ohms to 1 ohm gradation;
The voltage at the terminals of data 0.000V - 2.999V with gradation 0.001V;
The temperature inside the enclosure 0 - 80 ℃;
LCD screen size 23x12.5 mm, has three modes of display, toggle the button.
In the first mode largest shows voltage and current, small - power, energy and time.
Time is considered as long as the power requirements exceed 0.5 watts (at 5 V current is 100 mA). The energy values (Wh), the charge (mAh) and the time saved after shutdown tester.
In the second mode, the top line of displaying large voltage and current, and finely bottom power, the temperature inside the tester, the charge (mAh), energy (Wh) and time.
In the third mode, the left displayed on the input voltage USB connector contacts right load impedance, power, time, current temperature.
In the tester has to set the screen backlight. By default, it is lit for 10 seconds.
When the lights go off, the screen is seen worse, but the tester uses a small current record - 1.55 mA (with backlight consumption is also very low - 2.9 mA).
illumination time is adjusted from 1 to 59 seconds, furthermore the backlight can disable or enable constant.
To measure the current tester used in thick manganin shunt resistance ultrasmall - (according to the manufacturer - 0.05 ohms). The USB connectors are used pins made of copper. Via Milliommetr I measured the resistance of the whole of the tester with the shunt. It amounted to 0.133 ohms.
Accuracy of measurement of voltage and current was checked using a source of reference voltage and high precision instrument Keithley 2000 Multimeter.
At a voltage of 5 volts everything is perfect.
At higher voltages, the tester is less accurate. Thus, when the voltage 9.6008 In it shows 9.54 V - 0.6% error.
Current measurement error of about 2%: at a current of 0.51A shows 0.51908A - 1.8% error.
1.0184A - shows 1.00A. The error of the same 1.8%.
Bottom view. After soldering flux elements washed, and after soldering connectors no.
IN Shops Manufacturers There are eight options testers with different backlight colors (blue, white, orange), different types of display (normal, inverse), and different body color (transparent blue). I chose TransparentBlue option - it is the third since the end of the list.
This tester at a low price ahead of other models in terms of accuracy, ultra-low consumption (pauerbanki can be tested without loss of accuracy), the shunt with low resistance capabilities.
Pros USB-tester ATORCH USB tester A-TH-USB:
• high accuracy;
• high current ultra low resistance shunt;
• ultra-low consumption (2.9 mA with backlight, 1.55 mA without);
• a wide range of measured voltages (3.6-32.5 V);
• measurement of currents up to 5A;
• measurement of energy (Wh);
• storing values of the energy (Wh), the charge (mAh) and time;
• automatic stop counting time when the load power less than 0.5 W;
• controlled backlight;
• voltage measurement on the data contacts;
• measurement of load resistance.
Cons USB-tester ATORCH USB tester A-TH-USB:
• very small screen. Everything except the voltage and current shown in small font;
• tester is powered by a voltage source being measured, so it is impossible to test the capacity of the low-voltage batteries and accumulators;
• Do not washed off the flux with sockets contacts.
At the same manufacturer have the same tester without a USB connector ATORCH DC Energy tester 100V 15ABut with external power supply from the MicroUSB, that allows you to test low-voltage batteries and accumulators and to completely eliminate measurement errors caused by the consumption of the tester.
Now it becomes very popular USB-testers with a color screen and Bluetooth data transmission, but they doubled expensive and use e-Tester for more serious measurement seems preferable load EBD-USB + connecting to a computer.
Soon I talk about these two devices in detail, but they are all the same for those who are engaged in the measurements constantly, and a simple USB-tester, in my opinion should be in any person, even a little interested technology.
© 2018 Alex Nadozhin
The main theme of my blog - Equipment for human life. I write reviews, share experiences, talk about all sorts of interesting things. And I'm doing stories of the interesting places and tell about interesting events.
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My second project - lamptest.ru. I test LED lamps and help figure out which ones are good and which are not.