Recently, I purchased an Digital LCR Meter to complete the equipment in my laboratory. I chose the EastTester(杭州中创) ET4410 as it offers a relatively high cost-performance ratio.
I bought it on Pinduoduo for 1,199 yuan(RMB). It seems that the Victor VC4090C is also manufactured by EastTester on an OEM basis.
Electronics/Microcontroller Technology QQ Group: 820537762
Source Article URL：https://blog.zeruns.tech/archives/763.html
ET4410 Overview
This series of LCR digital bridges is a component parameter analyzer designed based on the automatic balanced bridge principle, offering a testing bandwidth of 10Hz-100kHz, continuous adjustable frequency, and a basic accuracy of 0.2%. The instrument provides precise and comprehensive measurement and analysis for most components and materials, making it suitable for product development, component inspection, and online product sorting applications.
Product Features:
● Maximum measurement frequency of 100kHz, adjustable in 1Hz steps (ET4410 has 16 fixed frequency points, not continuously adjustable)
● Test level adjustable from 10~2000mV in 1mV steps (ET4410 has 6 fixed levels, not continuously adjustable)
● Supports DC resistance (DCR) and electrolytic capacitor measurement
● Internal bias voltage output from 10mV to 1500mV
● 3.5-inch TFT display with 5-digit accuracy
● Connectivity options include USB Device, RS232 (or 485), Handle, GPIB (optional), USB Host (optional)
● Data logging for maximum, minimum, and average values
● SCPI communication protocol supported
● System settings allow language selection (Chinese or English), buzzer, and screen brightness adjustment
● Basic measurement accuracy of 0.2% (though the manual states 0.1%, which remains unclear)
● Manual and automatic range selection
● Open and short circuit calibration functions
● 5-level sorting comparator and alarm function
Main Technical Specifications:
General Specifications:
● Power supply: 220V.AC ±10% or 110V.AC ±10%, 45~65Hz
● Power consumption: <10W
● Display: 3.5-inch TFT LCD, 480×320 resolution, 16M colors
● Temperature range: Operation 10℃~+40℃, non-operation -10℃+60℃40℃ up to 90% relative humidity
● Humidity: 0
● Interfaces: RS232 (or 485), USB Device, Handle standard; GPIB, USB Host optional
● Weight: 2.1kg
Standard Accessories:
● Three-core power cable (30A51)
● Four-terminal Kelvin test cable (35A51)
Optional Accessories:
● GPIB cable (32P01)
● RS232 serial cable (32P04)
● USB data cable (32P05)
● 2m/4m test cable (35P01)
● Lead-type Kelvin test clip (35A52)
● SMD chip component test clip (35P02)
● LCR test pen / four-wire chip component test clip (35P03)
● Four-terminal Kelvin test fixture
● Gold-plated short circuit plate (35A53)
Zhongchuang Official Website: https://url.zeruns.tech/AbnPc
Pinduoduo Purchase Link for ET4410: https://p.pinduoduo.com/cyrO5Mdm
JD.com Purchase Link for ET4410: https://u.jd.com/jiplXbc
Taobao Purchase Link for ET4410: https://s.click.taobao.com/RaYNQyt
Due to the lack of documentation on the Zhongchuang website, I downloaded some materials from Victory's website, as they are mostly compatible with Zhongchuang's ET44 series.
VICTOR 4090 Series Desktop Digital Bridge Manual (compatible with Zhongchuang ET44 series) download link: https://www.123pan.com/s/2Y9Djv-WpcvH.html
VICTOR 4090/4091 Series Desktop Digital Bridge Driver and Communication Protocol download link: https://www.123pan.com/s/2Y9Djv-NpcvH.html
Unboxing
Front of the box:
Inside the box, the left compartment holds accessories, and the right side is the bridge:
Accessories include Kelvin test clip, power cable, and manual:
Manual/operation guide:
Front of the device:
Side of the device:
Back of the device:
Calibration
Short Circuit Calibration
Open Circuit Calibration
Testing
Testing a 5mΩ sampling resistor: the result seems inaccurate, indicating limited accuracy for low-resistance measurements.
Testing a 100mΩ constantan wire: the result is very accurate.
Testing a 13kΩ, 1% accuracy 0805 resistor: the test result is 13.002kΩ, very precise.
Testing a Rubycon 220μF 63V electrolytic capacitor (authenticity unknown) using the electrolytic capacitor mode at a 1kHz test frequency: test result is 212.95μF, D value 0.0931.
Testing a 47nF ceramic capacitor: test result is 47.98nF, D value 0.0142.
Testing a 220μF electrolytic capacitor: test result is 208.1μF, D value 0.0303.
Testing a 22μH toroidal inductor: test result is 22.52μH, Q value 19.72.
Using DCR mode to measure the DC resistance of a 22μH toroidal inductor: test result is 0.009Ω.
Testing the inductance of a 2.5mH isolation transformer coil at a frequency of 100kHz: test result is 2.6366mH, Q value 1.652. Connecting the isolation transformer’s other end to an oscilloscope shows a 100kHz sine wave signal from the LCR meter.
In List Sweep Mode, it seems the ET4410 has a bug as measured values differ from those in regular mode at the same frequency. Customer support acknowledged the bug and provided a firmware update tool: https://blog.zeruns.tech/archives/774.html
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