Milliohm Meter, Battery Tester, Internal Resistance Measurement, 1.0-1500mΩ, 2.7-16V

SKU:: 352
Manufacturer:: Tokyo Devices
Model Number:: IW7807-KIT
EAN:: 4560457401349
Released on:: Jan 2012
Category:: Batteries Measurements
Series:: IW78X7

Milliohm meter using the AC four-terminal method, ideal for monitoring battery degradation.

Ideal for battery characteristic matching and other applications.
In addition to measuring internal resistance, it can also measure very small resistance values of PCB traces and cables.
Because it uses an AC application method, it is possible to measure batteries during charging or discharging.
You can observe the dynamic changes in internal resistance during charge/discharge cycles.
We also offer module versions IW7817-IS and IW7817-CS, which allow numerical data to be read out by a microcontroller.

Measurement Example (Video)

This video shows an example of measuring the internal resistance of an aged 6V lead-acid battery using the IW7807.
Since it uses the four-terminal method, four probes are connected.

Although the voltage reading of this lead-acid battery shows 6.14V and appears normal at first glance, a high internal resistance exceeding 130 mΩ is observed.
Normally, this type of battery should exhibit an internal resistance of about 10–20 mΩ, indicating that sulfation due to aging has occurred.
In this way, by measuring internal resistance, hidden degradation that is not visible from voltage readings alone can be directly identified.

Note: In the video, the IW7807 board has been removed from its case for filming purposes.

Specifications

Measurement Item	Description
Measurement Method	AC current application, four-terminal method (Measurement frequency: 5 kHz, Measurement current: 40 mA, Open circuit voltage: 5 V)
Resistance Measurement Range	1.0–1,500 mΩ
Voltage Measurement Range	2.7 V–16 V
Resistance Resolution	10 μΩ
Voltage Resolution	0.01 V
Power Supply	9 V DC (AC adapter jack: inner diameter 2.1 mm, outer diameter 5.5 mm)
Current Consumption	Approximately 60 mA
Display	16x2 LCD display
Board Dimensions	W96.0mm × H54.0mm
Terminals	Compatible with AWG26–14 (0.12sq–2sq) wires, M2.6 screw terminals

Package Contents

IW7807 main unit
AC adapter

Precautions

Only the internal resistance of DC sources such as batteries or DC power supplies can be measured.
Do not apply AC sources, as it may cause malfunction or damage.
For highly accurate measurements, please use a calibrated measuring instrument.

Related Keywords

Internal resistance, battery internal resistance, battery degradation measurement circuit, inner resistance measurement, milliohm meter, battery tester, lithium-ion battery internal resistance, nickel-metal hydride internal resistance, battery internal resistance, DIY internal resistance meter, internal impedance, battery impedance, battery matching.