Condition:New
Type:Logic ICs
The selling point of this watch is accuracy and stability! Welcome friends who have professional high-precision instruments to compare PK!
4 bit 1/2 digits display, high-precision and high-speed ADC, the accuracy satisfies most enthusiasts.
Note: The output of this meter is AC current, which is designed according to the battery internal resistance AC method test standard. Can not accurately measure the DC resistance of the transformer motor coil! The measured value is the series equivalent resistance (non-impedance!) of the DC resistance of the coil and the eddy current loss of the iron core (magnetic core) at a frequency of 1KHz. For non-battery internal resistance measurement applications, please confirm with the shop owner.
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Standard four-wire measurement 1KHz sine AC phase detection technology, designed in accordance with the battery internal resistance detection standard. The basic principle is similar to that of an electric bridge. The equivalent resistance of the circuit is measured to avoid the influence of the capacitive reactance and inductance of the component itself, and the measurement accuracy is higher. It can avoid the influence of the DC bridge micro-resistance on the measurement result due to the contact potential temperature difference potential, and at the same time avoid the thermal effect of the current to affect the measurement result with a small test current, and can accurately measure the tiny between 0--25.000 milliohms and -10.000 ohms Resistance, four-and-a-half digits display, the highest resolution is 1 microohm, and the DC voltage at both ends of the loop is measured at 0-100v. The resistance meter also conforms to the international standard for measuring internal resistance of batteries by the AC method, and can be used to measure various large, medium and small rechargeable batteries , The internal resistance of the battery pack voltage is an ideal tool for testing battery performance.
Completely independent design, a large number of applications of precision components; ultra-low temperature drift reference resistance, high-precision instrument amplifier, 16-bit high-precision high-speed AD converter. With strong anti-interference ability, low temperature drift, fast and stable reading response. It is close to reaching the accuracy level of professional meters, but the price is not as good as the test line of a professional meter, and the accuracy is far beyond ordinary digital bridges and multimeters! Super cost-effective!
use;
Scientific research physics experiment replaces expensive imported instruments
Internal resistance measurement and voltage measurement of batteries and battery packs; support large-capacity lead-acid batteries for lithium-ion batteries. Support communication base station battery, large-capacity UPS battery online detection (please operate strictly in accordance with relevant safety regulations!)
Wire resistance per unit length to judge the quality of the wire
Contact resistance of contactor, relay, switch, connector
Current shunt resistance
Electrolytic capacitor internal resistance ESR (C>20uf 1KHZ frequency impedance <10Ω)
Performance test of internal resistance of electric power factor compensation capacitor
The internal resistance of the hollow coil (impedance at 1KHZ frequency <10Ω)
The equivalent internal resistance of the cored coil (impedance <10Ω at 1KHZ frequency, the displayed value is equivalent to the series of the coil resistance and the core loss resistance) to judge the inductance loss. The equivalent resistance can be used to quickly determine the short circuit between the turns of the high-frequency inductance transformer coil, which is better than the DC milliohm meter.
Quickly locate the short circuit fault of the circuit board. Such as repairing computer motherboard CPU power supply, mobile phone power supply (please contact the boss to adjust the parameters).
Range and accuracy:
Resistance measurement is divided into four gears, which can be automatic or manual.
The voltage is automatically three gears.
Pure resistance measurement
Gear range Accuracy Temperature drift Resolution Test current
3 25.000mΩ ±0.3% ±2D <50ppm 1μΩ 50mA@1khz
2 200.00mΩ ±0.3% ±2D <50ppm 10μΩ 50mA@1khz
1 2500.0mΩ ±0.06% ±2D <30ppm 0.1mΩ 50mA@1khz
0 10.000Ω ±0.04% ±2D <20ppm 1mΩ 50mA@1khz
Battery equivalent resistance measurement accuracy: ±0.4% ±4D
Voltage measurement accuracy:
± 0.V-25.000V ±0.06% ±2D <30ppm resolution 1mV
± 25V-50.000V ±0.06% ±2D <30ppm resolution 2mV
±50V——101.99V ±0.06% ±2D <30ppm resolution 10mV
Measurement speed: slow speed is about 1.7 times/sec. Fast about 3 times/sec
Capacitance ESR measurement
This table is a non-professional ESR table. The test range is limited!
Test condition: The capacity of the measured capacitance must be greater than 20 microfarads.
When the capacitance is 1KHZ, the D value is less than 0.05, the error is large, such as measuring CBB capacitance
±2.5%±10D
Measuring electrolytic capacitors has a better accuracy of ±0.5% ±5D (using resistance gears 0 and 1 gears). The accuracy is similar to that of a digital bridge.
Calibration: voltage resistance supports self-calibration of any value. You can use higher-level standard resistance and voltage source calibration to obtain a higher level of accuracy.
Other functions:
Automatic retention of measurement data: When the test line is separated from the original under test, the data is automatically retained until the next measurement starts
Zero clearing function: short-circuit clearing eliminates the influence of test lines and the environment, supports one-key clearing (automatic mode) and single gear clearing for relative value measurement (manual mode)
Timing shutdown: can be turned on and off 1-90 minutes to set delay automatic shutdown
Screen brightness: 2-level adjustment
Buzzer: Button buzzer, voltage over-range alarm, the same reminder of test data twice (when the data retention function is turned on), low battery alarm when the battery power is lower than 3.0V, and a reminder 1 minute before the scheduled shutdown.
Battery voltage display; the battery voltage in the machine can be displayed graphically or digitally. It will automatically shut down when the voltage is lower than 2.9V.
Data storage: the reset data can be stored, and it will be automatically loaded next time it is turned on; the menu settings are stored.
Use matters:
Recommended temperature: 7-35 degrees. Too low temperature will slow down the response of the LCD screen. Try to keep the temperature as constant as possible to avoid the uneven internal temperature that will affect the accuracy or cause condensation to affect the normal operation of the instrument.
When measuring the internal resistance of capacitors and inductances, the data is valid at 0-1 of the range gear, and the other gears 2-3 have errors, and the error decreases with the increase of capacitance. It can be ignored when it exceeds 1000uF.
The high sensitivity of this watch also has certain requirements on the use environment. Avoid measuring in complex electromagnetic environments such as high heat and humidity, strong magnetic fields and strong electric fields, otherwise the accuracy may be affected! When precise measurement is required, the user should have the corresponding measurement knowledge, and can test the use of other similar products on the Internet.
To achieve the desired accuracy, please warm up for more than 5 minutes, and reset it correctly before testing. Refer to the method of using the digital bridge.
During accurate measurement (resistance below 25mΩ), there should be no magnetic metal between the two test lines or keep the physical relative position of the test clamp line and the position during measurement as unchanged when cleared to avoid the superposition of electromagnetic induction eddy current loss resistance to the measurement Results.
Safety reminder!
This meter is strictly prohibited to measure or input any AC voltage or current. Otherwise it will be seriously damaged!
It is strictly forbidden to use it in a flammable and explosive environment!
It is strictly forbidden to measure DC voltage exceeding 100V! Otherwise it will be seriously damaged!
When the voltage of the tested object exceeds the standard safety voltage, safety protection should be done!
When measuring battery packs or other charged objects, the relevant operating safety regulations should be strictly followed, and any possible conductive parts of this instrument other than the test wires should not be electrically connected to the outside world! And do a good job of safety protection! Do not touch both ends of the test pin for 20 seconds after measuring the voltage exceeding 20 volts! To prevent accidental injury caused by electric shock stored in the meter.
Technical parameter:
Output open circuit voltage: AC 2~2.5Vrms, 1000HZ+-0.1%
Output current: constant current AC 50MA±1% 1KHZ sinusoidal
AC output impedance: 20Ω
DC input impedance: about 300KΩ
Power consumption; <1W
Charging current: 450-600MA, 4.2V
Rated battery supply voltage: 3.60V 3A
Shutdown voltage: 2.90V
Charging interface: MICRO USB 5V 1A
Built-in battery: 1000MAH polymer lithium battery, battery life about 3 hours
Volume: 143mmX82mmX38mm
Weight: about 205 grams (without batteries)
Accessories: Kelvin test clamp wire, 4-wire test needle wire (choose one of the two wires).
Voltage measurement and 34401A comparison
Battery internal resistance measurement (battery pack 3.5ah battery in two parallel 6 strings)
4-wire current sense resistor 1 milliohm ±0.5%
4-wire current sense resistor 2.2 milliohm ±0.5%
4-wire current sense resistor 47 milliohm ±0.5%
4-wire precision resistance 50 milliohm ±0.1%
4-wire precision resistance 100 milliohms ±0.1%
4-wire precision resistance 500 milliohms ±0.01%
4-wire precision resistance 10 ohm ± 0.01%
Comparison of measurement results of 1000μF electrolytic capacitor ESR internal resistance bridge
18650 old battery internal resistance bridge measurement comparison
Two super capacitors in series internal resistance ESR
35μF air conditioner start capacitor internal resistance ESR
Comparison of internal resistance of hollow inductors
Household 20A watt-hour meter shunt resistance 200 micro ohms
Three years of internal resistance of the car's starting battery
