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Connection diagram of isolated power supply for ammeter
Wire Connection
- Thin red wire: the positive pole of the power supply, which needs to be connected to the positive pole of the power supply within the range of DC 3.5-30V
- Thin black wire: negative pole of the power supply (it needs to be suspended when the thick black wire is connected to the system to take power)
- Thick red wire: the positive electrode of the current measurement signal input, and the negative electrode of the power supply part
- Thick black wire: current measurement signal input negative pole, connected to the negative pole of the device under test
The ammeter is powered by the power supply in the measurement system.
Note
The meter head needs independent power supply, and the power supply range is DC 3.5-30V. When the power supply is connected between the thin red and black wires, the meter head will display 0.0000 (extremely 1 may appear), then you can change the thick black line to the thick The red wire is connected in series to the circuit under test.
1. The ground wire of the power supply terminal and the measurement terminal of the ammeter adopts a common ground design. Between the negative pole of the device and the negative pole of the power supply of the device under test)
2. It is recommended to use a separate isolated power supply for the power supply end of the meter (which can effectively prevent the ammeter from being connected in series with the positive electrode to burn the meter)
0.9A comparison test chart: (take the reading of a 6 and a half multimeter as the standard)
Please compare the accuracy of this ammeter with at least a five-and-a-half-digit multimeter. This product uses a six-and-a-half-digit multimeter as the product's calibration instrument to ensure the product's extremely high accuracy.
1.1A comparison test chart: (take the reading of a 6 and a half multimeter as the standard)
The current range of ordinary multimeters is relatively poor in indicators, so when comparing the test, please compare the equipment-be sure to leave enough room for accuracy, otherwise the reliability of the result is not high. In other words, general multimeters basically cannot keep up with the calibration accuracy of this meter.
S. A. ROBBINS
Reviewed in the United States on February 23, 2025
Not as accurate as claimed and no apparent way to recalibrate these meters. If there was a way to precision calibrate these meters, they would definitely be 5 stars. If you only need to see a change in current and not absolute accuracy then these meters might be ok.
Geo Brecke
Reviewed in the United States on January 24, 2025
I finally have a milliamp meter I trust!works great
J. E. Simon
Reviewed in the United States on August 1, 2024
I got this to measure current when a car is shut off. Wired it in series on the negative battery terminal. It did a great job. Much better than a multimeter. It does take a bit of wiring. I added alligator clips to the big wires and connections to a little power supply on the small wires. It measured an eighth of an amp @ 12V no trouble at all. The measurement was stable at tenths, changed slowly at hundredths, and jumped about on thousandths and ten thousandths. Considering I was measuring what is likely a short circuit someplace I don't find that surprising. Some tape to cover the back and I've got a nice piece of test equipment. A real bargain at the price.
Angela Friemel
Reviewed in the United States on February 25, 2024
Worked perfect for our application. Affordable and reliable.
Robert Clarence
Reviewed in the United States on January 2, 2024
i have compared this meter with two recently calibrated Fluke voltmeters and it all lines up to at least 2 decimal places.
djk123
Reviewed in the United States on May 21, 2023
Using this in conjunction with my power supply that only has a 3 digit meter. Now I can measure the actual current draw of a single segment of an LED display.The 3 Amp limit is no problem, as this supply is only rated for the same 3 Amps.
iFIX COMPUTERS
Reviewed in the United States on May 28, 2021
I wasn't expecting this meter to be this accurate. I repair lot of phone and ipads for data recovery and this little device have worked magic for me to detect issues.
Angel Le
Reviewed in the United States on May 12, 2020
Excellent big readout visible at a great distance.About performance is super accurate in measurements.Excellent Digital display Ammeter, nice performance. . . No issues, No complaiments.We installed carefully avoiding short-circuits and works OK.Very important is taking care when you are wiring this Ammeter because many manufacturers made other similar Digital Panel Voltammeters and they are very similar, but wiring and connecting it may seem the same or be identical, but it is not. . . Since the 1990s onwards I mounted many of those Digital and Analog panel Voltammeter and many times it always changes in some detail or wire positions.((( My My advice is this: ))) Always check your wiring connections 3 times and always choose a low amp load and low voltage to start testing your Digital Panel Voltammeters. . . Then if everything goes OK, with a small marker write the poles in the resistor shunt and put masking tape on the wires and label them as you see fit (if Ammeter requires shunt-resistor) ---.Fast shipping too arriving safely and without harm. We are happy to have another. This is our third Ammeter like that".We surely continuing buying more of those Ammeters for its great performance... They are a little expensive, but a thousand times better than those junk filth that sell a lot for a couple of dollars. . .《《《 We recommended 100% 》》》A++
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