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Before measuring the resistance Rx, short the test leads and perform zero adjustment. If there is any voltage across the Rx circuit, it will result in a short-circuit, so be sure to check. The analog tester detects resistance values based on the change in ammeter A when connected to the resistance Rx. Two-terminal measurement with a digital tester and four-terminal measurement with a resistance meter Most digital testers measure resistance with two terminals.
They use a voltmeter to detect the resistance value of resistance R0 while applying a constant current to the measurement target, and the resulting reading includes the wiring resistance r1 and r2. To reduce the impact of the wiring resistance on measured values, it is necessary to perform zero-adjustment by shorting the test leads before measuring the resistance R0. However, this method is not able to eliminate the effects of the contact resistance between the test leads and the measurement target.
In addition, it is not able to yield an accurate reading if the resistance R0 is small. In four-terminal measurement, the circuit that applies the constant current and the circuit that includes the voltmeter are independent up to both ends of the measurement target.
As long as zero-adjustment is performed by properly shorting the four test leads, it is possible not only to eliminate the effects of contact resistance, but also to ignore the effects of wiring resistance values r1 to r4. Only certain Hioki products, including some bench-top digital multimeters and resistance meters, use four-terminal measurement to measure DC resistance.
Resistance meter temperature correction functionality The resistance of all objects varies with temperature. Since all targets measured with a resistance meter will not necessarily be at the same temperature, it is necessary to eliminate the effects of temperature in order to ensure consistent testing. In order to make use of this functionality, it is necessary to configure the resistance meter with a temperature coefficient.
In the case of annealed copper wire, a coefficient of 0. This is the standard value used by Hioki resistance meters. For more information about temperature coefficients for different materials, please see the user manual that came with your Hioki resistance meter. The 24 AWG 0. This technique can be used to measure internal resistance as low as several milliohms. These instruments also enable high-precision DC voltage measurement OCV , another application in which high accuracy is required for batteries, at 0.
By allowing the measurement frequency to be set to a value other than 1 kHz, the Battery Impedance Meter BT can be used to perform more fine-grained testing of internal resistance from Cole-Cole plot measurement. It also delivers measurement accuracy of 0. The BT and are well suited for use with battery cells designed for electric vehicles EVs and hybrid electric vehicles HEVs as well as with lithium-ion rechargeable batteries used in compact battery packs for mobile devices due to the low internal resistance of these types of cells.
By contrast, the BT and BT should be used with battery packs sets of multiple lithium-ion rechargeable batteries due to the high battery voltage OCV of such configurations. Although the instruments can also be used to measure internal resistance and battery voltage for other rechargeable batteries such as nickel-metal-hydride, lead acid, and nickel-cadmium batteries, you should choose a battery tester on the basis of the battery voltage OCV.
Measuring the internal voltage of a battery pack also known as an assembled battery, battery stack, or battery module To obtain the required voltage, a battery is constructed by connecting multiple cells in series.
To create such a battery pack also known as an assembled battery, battery stack, or battery module , tabs or busbars are welded in place to connect the cells.
Since weld anomalies will prevent the battery pack from delivering its full level of performance, it is recommended to test assembled battery packs using a battery tester. The BT can measure the internal resistance of battery packs of up to 60 V, while the BT can measure the internal resistance of battery packs of up to V. These components are generally calculated by means of Cole-Cole plot Nyquist plot measurement. The Battery Impedance Tester BT, which allows the measurement frequency to be varied within the range of mHz to 1.
It also ships with standard application software that can render Cole-Cole plots. Hioki battery testers can also be used for simple measurement of Class 2, Class 3, and Class 4 capacitors. With the BT, the measurement current is fixed for each measurement range. Measuring the ESR of a lithium-ion capacitor LIC As a result of a phenomenon known as transient recovery voltage, the potential of a lithium-ion capacitor LIC or electric double-layer capacitor EDLC does not stabilize immediately after the component charges or discharges.
The instrument has a maximum resolution of 0. Measuring the internal resistance of a Peltier device Peltier elements can be used in cooling, heating, and temperature control through application of a DC current. Since the BT can measure internal resistance using an AC current at a measurement frequency of 1 kHz, the instrument is able to measure the internal resistance of Peltier elements with low resistance values on the order of several milliohms.
RESISTANCE HiTESTER (3541)
Hioki 3541 Instruction Manual
RESISTANCE HiTESTER (3541)