Usage Method:
Power Supply
This instrument provides two types of power for testing: AC220V/DC12V. In the case of strong electromagnetic field interference, it is recommended to use DC power for testing. Under this condition, the measured values are stable and the anti-power frequency interference capability is strong.
1) DC Power Testing:
Close the power switch, the power indicator light is on, press the "Start/Stop" key, and then select the corresponding resistance range switch for testing. After the test is completed, press the "Start/Stop" key, the "Discharge" indicator light is on (if the stored charge in the tested object is small, the "Discharge" indicator light will not be on). After discharge, the "Discharge" indicator light goes off, then switch the test clips for another test.
2) AC Power Testing:
Connect the AC220V power supply, the corresponding indicator light ("Charging" indicator light or "Fully Charged" indicator light) is on, close the power switch, the power indicator light is on, press the "Start/Stop" key, and then select the corresponding resistance range switch for testing. After the test is completed, press the "Start/Stop" key, the "Discharge" indicator light is on (if the stored charge in the tested object is small, the "Discharge" indicator light will not be on). After discharge, the "Discharge" indicator light goes off, then switch the test clips for another test.
3) Charging:
Connect the AC220V power supply, at this time the "Charging" indicator light is on, indicating that the rechargeable battery inside the instrument is being charged. If the rechargeable battery inside the instrument has sufficient power, the "Fully Charged" indicator light is on. While the instrument is testing with AC power, it is also charging the internal battery. (The instrument is designed with a charging protection circuit, so overcharging will not occur.)
Connection Method of Test Leads
Connect the I+, V+, V-, and I- terminals of the instrument to the tested object according to Figure 1. This connection method can eliminate the influence of contact resistance and lead resistance on the measurement. In use, if the test leads provided with the instrument are not long enough, wires of appropriate diameter can be used to extend the test leads.
Measurement
After connecting the test leads according to Figure 2, close the power switch, the power indicator light is on, press the "Start/Stop" key, and the meter head displays "E0000". Select the resistance range according to the measured value, press the switch for that range, and the indicator light for that range is on. The stable value displayed on the four-and-a-half-digit LCD is the measured resistance value. When reading the value, pay attention to the unit on the selected range (mΩ/Ω/kΩ). When measuring large inductive test objects such as power transformers, it is best to short-circuit other coils that are not being measured outside the test circuit to avoid electromagnetic interference.
Discharge
After the test is completed, the main power can be turned off directly. If the test object is inductive, do not disconnect the wires immediately after turning off the power; allow the instrument to have a continuous discharge process. Generally, discharge for at least 20 seconds, otherwise the back electromotive force of the inductor may endanger personal safety.
Functional Features:
1. Uses a high-speed 16-bit A/D converter, with stable measurement data and good repeatability.
2. Automatic program-controlled current source technology, with a total of 1000 current ranges set by the internal microcontroller based on the measured resistance, achieving a wide measurement range and optimal measurement state without manual current switching.
3. Highly intelligent design, can automatically judge faults such as loose test lead connections and broken wires.
4. Comprehensive protection functions, reliably protecting the instrument from back electromotive force impact, with automatic discharge indication.
5. Can display measurement current and measurement time. Intelligent power management technology effectively reduces internal heating of the instrument.
6. Can store 120 measurement data records, which are not lost when power is off. All Chinese menu and operation prompts are intuitive and convenient.
Technical Specifications:
1. Measurement range: 1mΩ~2KΩ
2. Output current: 10A
3. Measurement accuracy: 0.2%±2 digits
4. Maximum resolution: 1uΩ
5. Working power supply: AC220V±10%
6. Ambient temperature: -10~40℃
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