TOOLTOP ET928 3-in-1 Handheld Digital Oscilloscope Multimeter Signal Generator User Manual

1. Introduction

The TOOLTOP ET928 is a versatile 3-in-1 handheld device combining the functionalities of a digital oscilloscope, a multimeter, and a signal generator. Designed for electrical testing, DIY projects, and professional use, it offers high-speed sampling, a wide analog bandwidth, and a comprehensive range of measurement capabilities. This manual provides detailed instructions for the safe and effective operation, maintenance, and troubleshooting of your ET928 device.

2. Product Overview

2.1 Key Features

• 50Msps high-speed sampling chip Oscilloscope with 12MHz analog bandwidth.
• One button to see the wave of voltage gear, automatic /conventional / single 3 waveform scanning modes.
• Waveform range up to 200V/grid, The highest up to 1600Vpp measurement.
• 6000 counts digital multimeter include voltage/current, resistance, capacitance, frequency, duty cycle, diode/on/off testing.
• Relative value measurement, effectively eliminating lead resistance, distributed capacitance or interference signals.
• Signal source outputs 3 types of waveforms: sine, triangle and square waveforms. Range, frequency, duty cycle adjustable.
• Configured with replaceable 18650 lithium batteries, more environmentally friendly.
• Overload protection 750mA:10A double fuse, double protection instrument.

2.2 Device Components

The TOOLTOP ET928 features a clear layout for ease of use:

• Charging indicator light: Indicates charging status.
• Charging interface: USB port for charging the device.
• Multi-Function Buttons (F1-F4): Used for various menu selections and function controls.
• AUTO button: Automatically adjusts oscilloscope settings for waveform display.
• SAVE button: Stores current data or waveform.
• Backlight/signal output: Controls display backlight and signal generator output.
• Data retention/storage: Manages saved measurements and waveforms.
• Functional range knob: Rotary switch to select different measurement modes (e.g., V, mV, A, mA, Ω, Cx, Hz%, Diode, On/Off).
• 10A current input terminal: Input for high current measurements.
• Signal output/current input terminal: Dual-purpose terminal for signal generation and current input.
• OSC VΩCx: Input terminal for oscilloscope, voltage, resistance, and capacitance measurements.
• COM input port: Common ground terminal for all measurements.
• MAX 10A FUSE, MAX 600mA FUSE: Fuse protection for current inputs.
• CAT II 1000V: Safety rating for voltage measurements.

2.3 Functional Overview

The ET928 integrates multiple functions to meet diverse work needs, including:

• Multimeter: Measures voltage (AC/DC), current (AC/DC), resistance, capacitance, frequency, diode, and performs on/off tests.
• Oscilloscope: Displays waveforms with 12MHz bandwidth and 50Msps sampling.
• Signal Generator: Outputs sine, square, and triangular waveforms with adjustable parameters.
• Colorful Lighting: Provides visual feedback for different modes.
• Data Storage: Stores measurement data and waveforms.

2.4 Additional Particulars

• Adjustable Backlight: For clear visibility in various lighting conditions.
• Beep Alarm: Provides audible alerts for certain functions or conditions.
• Soft Rubber Sheath: Enhances durability and provides protection against impacts.
• Rear Cover Bracket: Allows the device to stand upright for convenient viewing.

3. Specifications

3.1 Technical Parameters

3.2 Function Parameters

4. Setup

4.1 Initial Charging

Before first use, ensure the device is fully charged. Connect the provided USB cable to the charging interface on the device and to a suitable USB power source. The charging indicator light will show the charging status.

4.2 Connecting Test Leads

Insert the red test lead into the VΩCx input terminal and the black test lead into the COM input terminal for most measurements (voltage, resistance, capacitance, oscilloscope). For high current measurements (up to 10A), insert the red test lead into the 10A current input terminal and the black test lead into the COM terminal. For lower current measurements (up to 500mA), use the signal output/current input terminal for the red lead and COM for the black lead.

4.3 Powering On/Off

To power on the device, press and hold the power button (usually integrated with the functional range knob or a dedicated button, refer to Figure 1). To power off, press and hold the same button. The device also features an automatic shutdown function to conserve battery life.

5. Operating Instructions

5.1 Oscilloscope Mode

Turn the functional range knob to the 'OSC' position to enter oscilloscope mode. The ET928 offers three waveform scanning modes:

• AUTO: Automatically captures and displays waveforms without requiring specific triggering conditions.
• NORMAL: Similar to AUTO, captures waveforms without manual trigger setup.
• SINGLE: Captures a single waveform event when a trigger condition is met.

Use the F1-F4 buttons to navigate menus and adjust parameters such as time base, voltage division, and trigger settings. The 'AUTO' button can quickly optimize the waveform display.

5.2 Multimeter Mode

Rotate the functional range knob to select the desired measurement function (e.g., VDCX for DC voltage, VACX for AC voltage, Ω for resistance, Cx for capacitance, Hz% for frequency/duty cycle, Diode for diode test, On/Off for continuity test). Connect the test leads appropriately for the selected measurement. The device supports both manual and automatic ranging.

5.3 Signal Generator Mode

The ET928 can generate sine, square, and triangular waveforms. To use this function, select the signal generator mode (often integrated with the oscilloscope or a dedicated function). Use the F-buttons to adjust the frequency, amplitude, and duty cycle of the output signal. Connect the signal output terminal to the circuit or device you wish to test.

• Sine Wave: 100Hz ~ 100kHz
• Square Wave: 100Hz ~ 20kHz
• Triangular Wave: 100Hz ~ 50kHz

5.4 Data Storage

The device can store up to 100 sets of DMM data and 10 waveforms. To save the current measurement or waveform, press the 'SAVE' button. Navigate through saved data using the F-buttons or menu options.

5.5 Quiet Mode

To activate Quiet Mode and disable button sounds, hold down the F4 key while turning the functional range knob to power on the device. This allows for silent operation in sensitive environments.

6. Maintenance

6.1 Cleaning

Regularly clean the device with a soft, dry cloth. Do not use abrasive cleaners or solvents, as they may damage the casing or display. Ensure the device is powered off and disconnected from any power source before cleaning.

6.2 Battery Replacement

The ET928 uses a replaceable 18650 lithium battery. If the battery performance degrades significantly, it can be replaced. Refer to the warning label on the rear of the device: "TO AVOID ELECTRICAL SHOCK, DO NOT TEST READS BEFORE OPENING CASE." Only qualified personnel should attempt battery replacement. Ensure the device is powered off and disconnected before opening the battery compartment.

6.3 Fuse Replacement

The device is protected by 750mA and 10A double fuses. If current measurement functions cease to work, a fuse may need replacement. Fuse replacement should only be performed by qualified personnel. Ensure the device is powered off and disconnected from any power source before opening the casing to access the fuses.

6.4 Storage

When not in use for extended periods, store the device in a cool, dry place with temperatures between -10 °C and +60 °C and relative humidity below 90% RH. Avoid direct sunlight, extreme temperatures, and high humidity. It is recommended to charge the battery periodically if stored for a long time to maintain battery health.

7. Troubleshooting

If you encounter issues with your TOOLTOP ET928, please consider the following general troubleshooting steps:

• Device does not power on: Ensure the battery is charged. Connect the USB cable and attempt to power on while charging.
• Inaccurate readings: Check test lead connections. Ensure the correct measurement mode is selected. Verify that the probes are making good contact with the circuit.
• No waveform display in oscilloscope mode: Check trigger settings. Use the 'AUTO' button to attempt automatic waveform detection. Ensure the input signal is within the device's voltage range.
• No sound in Quiet Mode: This is expected behavior. If you wish to re-enable sounds, power off the device and power it on normally without holding F4.
• Current measurement not working: Check the fuses. If a fuse is blown, it will need to be replaced by a qualified technician.

For persistent issues, please contact customer support.

8. User Tips

No specific user tips were available from the provided reviews or Q&A content.

9. Package Contents

The standard package for the TOOLTOP ET928 includes:

• 1 x TOOLTOP ET928 Oscilloscope Multimeter Signal Generator
• 1 x Pair of Test Leads
• 1 x English User Manual
• 1 x USB Cable
• 1 x Package Box

10. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or the official TOOLTOP website. Keep your purchase receipt as proof of purchase for any warranty claims.