East Tester ET43 Series Handheld LCR Digital Bridge User Manual

1. Introduction

The ET43 series handheld LCR meter is a portable measuring instrument designed for testing inductors, capacitors, and resistors. It features a 2.8-inch TFT display, easy key operation, USB communication, and a high-capacity lithium battery for extended use. It supports comprehensive parameter measurements, screening, and deviation measurements, with a continuously adjustable output frequency. The basic accuracy reaches 0.2% or 0.3% depending on the model.

The operation is simple, allowing users to view test frequency, parameters, and speed by pressing the corresponding key. It also includes a recording mode for readings and convenient open/short circuit correction to improve measurement accuracy. Features like buzzer, automatic power-off, and language settings are available through the configuration menu.

The standard instrument is equipped with remote communication functionality, enabling remote control and data acquisition via a Mini-USB cable connection to a PC.

2. Safety Instructions

These safety measures are applicable to all users and maintenance personnel. Please pay close attention to them during service and maintenance.

2.1 General Safety Guidelines

• Do not use in explosive environments: Avoid using the instrument in dusty environments, direct sunlight, high humidity, strong electromagnetic radiation, or other harsh conditions.
• Professional Maintenance: Maintenance, component replacement, or instrument adjustment should only be performed by professional personnel. Contact the dealer or service department for assistance.
• Do not arbitrarily break down or modify the instrument: Partial replacement or unauthorized modification may prevent the instrument from recovering its performance.
• Security Warning: Always abide by the relevant terms in this manual regarding safety to prevent injury or damage to the product.

2.2 Safe Use Guidelines

• The instrument is suitable for indoor use and altitudes less than 2,000 meters. For short-term outdoor use, protect it from direct sunlight, water, electromagnetic radiation, and dust.
• Read and understand all warning and safety information in this manual before use.
• Use the instrument according to the functions specified in the manual.
• If measuring components on a circuit, ensure the circuit is turned off and all capacitors are discharged before measurement.
• Always discharge components like capacitors before measurement.
• The instrument is powered by a 5V 2600mAh lithium battery or via Mini-USB. It can be charged using Mini-USB.

2.3 Safety Symbols

! Security warning to remind the user to follow the instructions in the manual.

2.4 Environmental Conditions

• Working environment: 0 °C ~ 40 °C
• Humidity: 15% to 85% R.H
• Storage temperature: 0 °C ~ 40 °C
• Pollution degree: 2

3. Setup

3.1 Packing List

The ET43 Series handheld LCR meter package includes the following items:

• A handheld LCR meter (with lithium battery installed)
• A guidance manual
• A Mini-USB communication cable
• An AC power adapter
• A pair of red/black rubber plugs - alligator clip test line
• A short-circuit bar
• A pair of 4-terminal Kelvin test clips (optional for ET430/430B, standard for other models)

Please check the packing list upon opening the box. If any component is missing, contact the company or the dealer immediately.

3.2 Test Ports

The ET43 Series uses both 3- and 5-terminal test ports to offer convenience and high accuracy. The 3-terminal test port uses standard rubber jacks, allowing for inexpensive rubber plug-alligator clips for extended testing, though with lower accuracy. For higher accuracy, especially with extension lines, the 5-terminal test notch is provided for dedicated test fixtures, enabling complete four-terminal measurements.

3.3 Connecting to PC

The instrument can be connected to a PC via the Mini-USB interface for remote control and data acquisition.

1. Locate the USB driver software on the provided CD (Note: Newer packages may not include a CD; drivers might be available online).
2. Use the Mini-USB cable to connect the instrument to a USB port on your PC. Press and hold the power key to start the instrument.
3. Install the USB driver.
4. After installation, check the serial number in Windows' Device Manager.

Configuration of virtual serial port:

• ET43 Series employs serial communication parameters with variable Baud rates.
• Baud rate: 9600 or others.
• Data bits: 8
• Check: None
• Stop bit: 1
• Flow Control: None

Remote Control State: When the ET43 Series receives a remote operation state instruction from the host, it automatically enters remote control state, indicated by "RMT" on the LCD screen. To exit, send the "SYSTem: LOCal" command.

Command Protocol: The ET43 Series handheld LCR uses SCPI command set for control and query. The command format meets IEEE488 standards, supporting commands like *IDN?.

4. Operating Instructions

4.1 Startup and Shutdown

• Startup: Long press the power key to start the instrument. The measurement interface will be displayed (default).
• Shutdown: Press and hold the power key (for more than 2 seconds) to turn off the instrument.

4.2 Front Panel Introduction

The front panel features a 2.8-inch TFT LCD screen and various control keys. (Note: "long press" means holding the key for more than 2 seconds. Multifunction keys have both short and long press functions, while other keys only have short press.)

1. Display: 2.8" TFT LCD screen, displaying all instrument functions.
2. Data Holding/Recording Multifunctional Key (HOLD): Short press to toggle data holding; long press to toggle data recording.
3. Power Key: Long press to turn the instrument on or off.
4. Main Parameter Shortcut Key (AUTO/R/C/L/Z): Quickly switch main parameters.
5. Relative and Correction Multifunctional Key (NULL/CAL): Short press to toggle relative function; long press to toggle correction function.
6. Secondary Parameter Shortcut Key (X/D/Q/θ/ESR): Quickly switch secondary parameters.
7. Frequency and DCR Mode Multifunctional Key (FREQ): Short press to quickly switch fixed-point frequencies; long press to enter DCR mode.
8. Level Shortcut Key (LEVEL): Quickly switch fixed-point levels.
9. Bias Voltage and Electrolytic Capacitance Mode Multifunctional Key: Short press to enter electrolytic capacitance mode; long press to quickly select bias voltage.
10. Equivalent Shortcut Key (EQV): Quickly switch equivalents.
11. Interface Switch Key (SET): Quickly switch between "measurement display" and "System Settings".
12. Comparator Switch and Tolerance Limits Shortcut Multifunctional Key (TOL%): Short press to quickly switch deviation tolerance limit; long press to toggle comparator.
13. Measuring Speed Shortcut Key (SPEED): Quickly switch measurement speed.
14. Range Shortcut Key (RANGE): Quickly switch the required range.
15. Arrow Keys: Left/right control cursor movement; up/down select parameters.
16. Enter Key: Confirm selection of a parameter or function.
17. 5-terminal Test Notch: For connecting components directly or with Kelvin test fixtures.
18. 3-terminal Test Jack: For connecting test leads like alligator clips.

4.3 User Interface

4.3.1 Measurement Interface

This interface displays measurement results and settings.

1. Page title: Identifies the displayed page.
2. Measurement parameter settings: Shows current frequency, range, level, bias, and tolerance.
3. Main parameter display: An asterisk (*) indicates data holding state.
4. Secondary parameter display: Shows secondary measurement values.
5. Status Bar: Displays "USB" when connected to PC, and "Main Parameter Auto" when main parameters are in automatic mode.
6. Comparator display: Shows deviation percentage from nominal. Green/P indicates within tolerance, red/F indicates out of tolerance.
7. Measurement speed: Displays "Slow", "Medium", or "Fast".
8. Battery icon: Indicates remaining power.

4.3.2 System Settings Interface

This interface allows users to view product information and configure settings.

On this interface, you can view the product model, serial number, and version. You can also set the language, automatic power-off, display brightness, power-on behavior, and buzzer.

4.4 Parameter Selection

4.4.1 Selection of Frequency

The ET43 Series LCR meter applies an AC test signal. Different test frequencies can yield different results due to non-ideal and distributed parameters of components. Select the appropriate frequency before measurement.

Methods to change frequency:

• Method One: Press the FREQ key to cycle through different frequencies.
• Method Two: On the interface, use the left/right arrow keys to select the frequency, then use the up/down arrow keys to change the value.

Available frequencies (model dependent):

• ET430B/ET431: 100Hz, 120Hz, 1kHz, 10kHz
• ET430/ET432: 100Hz, 120Hz, 1kHz, 10kHz, 40kHz, 100kHz
• ET433: 100Hz-100kHz (continuously adjustable, 1 Hz step)

4.4.2 Selection of Level

The AC test signal level can be changed.

Methods to change level:

• Method One: Press the LEVEL key to cycle through different test signals.
• Method Two: On the interface, use the left/right arrow keys to select the level, then use the up/down arrow keys to change the value.

Available levels (model dependent):

• ET431/ET432: 1Vrms, 0.6Vrms, 0.3Vrms, 0.1Vrms
• ET430: 0.6Vrms, 0.3Vrms
• ET430B: 0.6Vrms
• ET433: 0-1V adjustable

4.4.3 Selection of Internal Bias

The ET43 Series offers an internal bias of 0-500mV, adjustable in 1mV steps (ET430/ET430B do not have this function). In DCR mode, the bias is 800mV.

Methods to change bias voltage:

• Method One: Use the left/right arrow keys to set the bias, press ENTER, then use the up/down arrow keys to select the bias value, and press ENTER to confirm.
• Method Two: Long press NULL to select the bias, then use the up/down arrow keys to select the required value, and press ENTER to confirm.

4.4.4 Selection of Range

Methods to change range:

• Method One: On the measurement display, use the left/right arrow keys to move the cursor to the range, then use the up/down arrow keys to switch the range (AUTO, 100Ω, 1kΩ, 10kΩ, 100kΩ).
• Method Two: Press the RANGE key to switch directly to the next range, moving the cursor to the range simultaneously.

4.4.5 Selection of Measurement Speed

Press the SPEED key to switch between measurement speeds: Fast (4 times/s), Medium (2 times/s), or Slow (1 time/s). The current speed is displayed above the status bar.

4.4.6 Selection of L/C/R/Z Main Parameters

Press the AUTO/R/C/L/Z key to cycle through the main parameters: R (resistance), C (capacitance), L (inductance), Z (impedance), and AUTO (automatic). When AUTO is selected, "Automatic Main Parameter" is displayed.

4.4.7 Selection of X/D/Q/θ/ESR Secondary Parameters

Press the X/D/Q/θ/ESR key to cycle through the secondary parameters: D (loss), Q (quality factor), θ (phase angle), ESR (equivalent series resistance), and X (reactance).

4.4.8 Selection of Tolerance (ET430B does not have this function)

Methods to set tolerance:

• Method One: Long press TOL% to open the comparator switch. The hidden "tolerance," "nominal," and deviation percentage will be displayed. Short press TOL% to cycle through preset tolerances (1%, 5%, 10%, 20%).
• Method Two: On the tolerance display, use the left/right arrow keys to move the cursor to the tolerance, then use the up/down arrow keys to switch to the desired tolerance.
• Custom Tolerance: Short press ENTER to enter the interface for custom tolerance (1% to 50%, resolution ratio of 1%). Refer to frequency setting method for details.

4.4.9 Selection of Nominal

To set the nominal value:

1. Place the component with the required nominal value on the test clip.
2. Press TOL% to turn on the comparator. The nominal value will be the measured value rounded to one digit after the decimal point (e.g., 1.0694kΩ becomes 1kΩ; 330.92Ω becomes 330Ω).
3. If the nominal value is not correct, use the left/right arrow keys to move the cursor to the nominal, then press ENTER to change it.

4.4.10 Selection of Equivalent

LCR testers typically use two equivalent models: series and parallel. Selecting the proper model improves measurement accuracy. Low-impedance elements (below 100Ω) should use the series equivalent model, while high-impedance elements (above 10kΩ) should use the parallel equivalent model. Elements in between are less affected by the choice of model. Press AUTO/SER/PAL to switch between series (SER) and parallel (PAL) equivalents.

4.5 DCR Mode (ET430/ET430B excluded)

Long press FREQ to enter DCR mode.

4.6 Electrolytic Capacitance Mode (ET430B excluded)

Long press the bias voltage key to enter electrolytic capacitance mode.

4.7 Relative Mode

Short press NULL to activate the relative function. The current value becomes the reference, and both the reference and relative values are displayed.

4.8 Reading Hold Mode (HOLD)

The data hold function freezes the displayed data while measurement continues in the background.

• Activate: Press the HOLD key. An asterisk (*) will appear on the LCD, and the main/secondary parameter results will be those displayed before pressing the key.
• Deactivate: Press the HOLD key again. The asterisk (*) will disappear, and the instrument will return to normal measurement mode.

4.9 Data Recording Function (Maximum, Minimum, Average)

This mode is useful for unstable measurements, dynamically acquiring maximum, minimum, and average readings.

• Activate: Long press HOLD. The recorded value is shown on the secondary display. Short press HOLD to select between maximum, minimum, or average display.
• Deactivate: Long press HOLD.

Reminder: Changing the type of measurement parameter will automatically exit data recording function.

4.10 Correction Function

The correction function applies to open and short circuits, reducing errors from distributed parameters of the test line. Short circuit correction reduces the impact of contact and lead resistance on low impedance measurements, while open circuit correction reduces the impact of distributed capacitance and resistance on high impedance measurements.

Correction method:

1. Before entering correction, ensure test terminals are open- or short-circuited. Press NULL to enter the correction interface. The instrument will automatically identify if it's an open or short circuit.
2. Short press NULL for open (OPEN) or short (SHORT) circuit correction. The interface will show "SUCESS" or "FAILED".
   Note: Do not change the state of the test terminals during correction.
3. After correction, short press NULL to return to measurement display.

4.11 Rapid Application Guide

Warning:

• Do not measure charged capacitors, as this may damage the instrument.
• When measuring on-board devices, ensure power is off. Active circuits cannot be measured directly.
• If used in dusty environments, clean the instrument periodically to prevent dust from entering test ports, which can affect conductivity and use.
• Do not place the instrument in environments with explosives, direct sunlight, or excessive heat.

Reminder: For proper accuracy, perform open and short circuit correction before measurement. Test fixtures can be rubber plug-alligator clips, Kelvin test fixtures, or components can be inserted directly into the 5-terminal test notch. Rubber plug-alligator clips are used in the following examples.

4.11.1 Resistance Measurement

1. Long press the power key to start the instrument.
2. Press the AUTO/R/C/L/Z key until Rs is displayed on the interface, indicating resistance measurement.
3. Insert the resistor into the test notch or connect it with appropriate test accessories (rubber plug-alligator clip, Kelvin test fixture, etc.).
4. Press the FREQ key to select the desired test frequency, and LEVEL to select the desired level.
5. To select another secondary parameter, press X/D/Q/θ/ESR.
6. Read the measurement results from the screen.

Reminder: The instrument uses an AC signal for resistance measurement, so the result reflects AC resistance characteristics, not DC resistance.

4.11.2 Capacitance Measurement

Warning: Ensure the capacitor is fully discharged before measuring. Large capacity capacitors may require longer discharge times. Connecting an undischarged capacitor can damage internal components.

1. Long press the power key to start the instrument.
2. Press the AUTO/R/C/L/Z key until Cs is displayed on the interface, indicating capacitance measurement.
3. Insert the capacitor into the test notch or connect it with appropriate test accessories.
4. Press the FREQ key to select the desired test frequency, and LEVEL to select the desired level.
5. To select another secondary parameter, press X/D/Q/θ/ESR.
6. Read the measurement results from the screen.

4.11.3 Inductance Measurement

1. Long press the power key to start the instrument.
2. Press the AUTO/R/C/L/Z key until Ls is displayed on the interface, indicating inductance measurement.
3. Insert the inductor into the test notch or connect it with appropriate test accessories.
4. Press the FREQ key to select the desired test frequency, and LEVEL to select the desired level.
5. To select another secondary parameter, press X/D/Q/θ/ESR.
6. Read the measurement results from the screen.

4.11.4 Impedance Measurement

1. Long press the power key to start the instrument.
2. Press the AUTO/R/C/L/Z key until Zs is displayed on the interface, indicating impedance measurement.
3. Insert the component into the test notch or connect it with appropriate test accessories.
4. Press the FREQ key to select the desired test frequency, and LEVEL to select the desired level.
5. To select another secondary parameter, press X/D/Q/θ/ESR.
6. Read the measurement results from the screen.

5. Maintenance

5.1 Overhaul

Warning: Do not arbitrarily repair the instrument; it should be maintained and repaired by professionals.

If the equipment fails to switch on, first check the battery and external power supply, power jack, etc. Also, check if any key is stuck or invalid.

If the test result is abnormal, first check if the test accessories have problems, or if there is damage to the spring in the test notch. Review the specifications to confirm correct operation.

Do not arbitrarily replace components or specific parts. Contact the relevant dealer or service company for any unconfirmed problems.

5.2 Cleaning

Before cleaning, the instrument must be shut down, and the battery and external power supply removed.

Prevent water or other liquids from entering the instrument through the test slot, keys, or other joints. If this happens, immediately stop using it and remove the power supply and battery.

Clean with a soft cloth and diluted neutral detergent. Carefully wipe dirty parts to prevent scratches on the surface.

After cleaning, ensure the instrument is completely dry before use.

5.3 Storage

Store the instrument in a dry, clean environment within the specified storage temperature range (0 °C ~ 40 °C).

6. Troubleshooting

This section provides guidance for common issues. For problems not listed, please refer to the maintenance section or contact customer support.

• Instrument does not power on: Check battery charge level. Ensure the power adapter is correctly connected if using external power. Verify the power key is not damaged.
• Inaccurate measurements: Ensure test leads are securely connected and not damaged. Perform open and short circuit calibration. Verify the correct measurement parameters (frequency, level, range) are selected for the component being tested. Ensure capacitors are fully discharged before measurement.
• Display issues: Check display brightness settings in the system menu.
• Connectivity issues with PC: Ensure USB drivers are correctly installed. Verify the Mini-USB cable is functional and securely connected.
• Loose test lead connection: If test leads (e.g., Klein tweezers) fit loosely, ensure they are firmly seated or consider using the 5-terminal test notch with dedicated fixtures for better stability and precision.
• Protective cover obstructing USB port: If the blue protective cover interferes with the USB-C port, it may need to be adjusted or removed for proper charging or PC connection.

7. Specifications

Here are the general and measurement accuracy indicators for the ET43 Series handheld LCR meters. These parameters are subject to change without notice.

7.1 General Parameters

7.2 Measurement Accuracy

Accuracy is defined as R, C, L, Z, X accuracy. When Dx≤0.1, L, C, X accuracy applies. When Qx≤0.1, R accuracy applies. Ae is the relative accuracy.

Notes on Accuracy:

• Ambient temperature: 20 ℃ ± 2 ℃, humidity: ≤80% R.H.
• Preheat the instrument for at least 30 minutes before testing.
• Test at the test notch on the end face of the instrument.
• It is recommended to perform open and short circuit correction before testing.
• Measure with the recommended equivalent mode.
• Percentage error is expressed as: ± (% of the reading + last digit).
• If the actual measurement exceeds the specified scope in the tables, the accuracy for the excessive part will not be given.
• Subscript meaning: S- series equivalent; P- parallel equivalent; e- accuracy.
• Some parameters cannot be given in data tables and must be calculated based on measurement results.

Detailed accuracy tables for Capacitance (C) and loss (D), Inductance (L) and quality factor (Q), and Impedance (Z) and phase angle (θ) are provided in the full PDF manual for various frequencies (100Hz/120Hz, 1kHz, 10kHz, 40kHz, 100kHz).

For a complete breakdown of accuracy indicators, including specific tables for ET433, ET432/ET431, ET430/ET430B, and DCR, please refer to the official user manual PDF: ET43 Series Handheld LCR Bridge Instruction for Use (PDF).

8. User Tips

• Secure Test Leads: Ensure test leads, especially alligator clips or tweezers, are securely connected to the test ports. Loose connections can negatively affect measurement precision.
• USB-C Port Access: If the protective blue cover obstructs the USB Type-C port, it may need to be adjusted or temporarily removed to allow for proper charging or PC connection.
• Newer Models: Be aware that newer production batches may feature updated components like a USB Type-C port.
• Discharge Capacitors: Always fully discharge capacitors before testing to prevent damage to the meter.
• Calibration: Regularly perform open and short circuit calibration for optimal measurement accuracy.

9. Warranty and Support

For warranty information, technical support, or service, please contact the original seller or the manufacturer, Hangzhou Zhongchuang Electronics Co., Ltd. Refer to the contact details provided in the product packaging or on the manufacturer's official website.