1. Introduction
The TOOLTOP ET120M is a versatile and portable digital oscilloscope designed for a wide range of applications, including home appliance testing, automobile diagnosis, scientific research, education, product development, and equipment debugging. It features a 120MHz analog bandwidth, 500MS/s sampling rate, and a 2.4-inch clear color screen. This manual provides detailed instructions for the safe and effective use of your ET120M oscilloscope.
2. Safety Information
Please read and understand all safety instructions before operating the device. Failure to follow these instructions may result in electric shock, fire, or damage to the device.
- Always use the correct voltage and current settings for your measurements.
- Do not operate the device in wet or damp conditions.
- Avoid exposing the device to extreme temperatures or direct sunlight.
- Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
- Ensure the probe is properly connected before making any measurements.
- Keep the device away from strong electromagnetic fields.
3. Package Contents
Verify that all items listed below are included in your package:
- 1 x TOOLTOP ET120M Digital Oscilloscope
- 1 x 100MHz Probe
- 1 x USB Charging Cable
- 1 x User Manual (this document)
- 1 x Cloth Bag
Image: Package contents including the oscilloscope, probe, charging cable, user manual, and a cloth bag.
4. Product Overview
Familiarize yourself with the main components and controls of your ET120M oscilloscope.
Image: Front view of the TOOLTOP ET120M oscilloscope.
4.1 Key Features
- Waveform Auto Adaptation Screen: One-key automatic waveform adjustment.
- Three Scanning Modes: Auto, Normal, Single.
- 120MHz Waveform Bandwidth: High-performance signal analysis.
- Square Wave Signal Output: Built-in signal generator with multiple frequencies.
- 2500 Storage Waveforms: Thumbnail browsing for easy review.
- Compact & Portable: Lightweight design with a silicone protective cover.
- Rechargeable Lithium Battery: Up to 6 hours of continuous use.
Image: Overview of the ET120M's key advantages.
4.2 Device Layout
Image: Detailed view of the ET120M's ports and features.
- 1: Signal Output Ring: For outputting square wave signals.
- 2: Probe Jack: Connect the oscilloscope probe here.
- 3: Rechargeable Battery Jack: For charging the internal lithium battery.
- 4: Back Bracket: Supports the instrument for easy observation of data.
- 5: Switch: Power on/off button.
- Silicone Sheath: Provides easy grip and protects the charging interface.
5. Setup
5.1 Charging the Device
The ET120M is equipped with a built-in rechargeable lithium battery. Before first use, or when the battery is low, connect the provided USB charging cable to the rechargeable battery jack (3) and a suitable USB power adapter (not included). The device can operate continuously for up to 6 hours on a full charge.
Image: The oscilloscope is powered by a rechargeable lithium battery.
5.2 Powering On/Off
To power on the device, press the power switch (5) located on the side. To power off, press and hold the same switch. The device also features an auto-shutdown function after 15 minutes of no operation to conserve battery life.
6. Operating Instructions
6.1 Waveform Auto Adaptation
The ET120M features a one-key waveform auto adaptation function. Simply press the AUTO button, and the oscilloscope will automatically adjust the waveform to fit the screen, optimizing the time base and vertical sensitivity for clear display.
Image: Waveform auto adaptation in action.
Video: Demonstration of the oscilloscope's features, including auto adaptation and menu navigation.
6.2 Scan Modes
The oscilloscope offers three scan modes to suit different measurement needs:
- Auto Mode: Collects signals continuously, regardless of whether the trigger conditions are met or not.
- Normal Mode: Collects and keeps the last waveform that meets the trigger condition.
- Single Mode: Collects and keeps the first waveform meeting the trigger condition.
Image: Explanation of Auto, Normal, and Single scan modes.
6.3 Adjusting Parameters
You can adjust various parameters to fine-tune your measurements:
- Trigger Edge: Press the EDGE key to switch the trigger edge (rising/falling).
- Coupling Mode: Press the AC/DC key to switch between AC and DC coupling.
- Probe Magnification: Press the 1X/10X key to switch the probe magnification.
- Center Trigger Indication: Press the 50% key to automatically center the trigger indication to the center of the waveform.
Image: Controls for setting time base, sensitivity, and trigger edge.
6.4 Measurement Functions
The ET120M supports 12 kinds of automatic parameter measurements:
- Vpp (Peak-to-Peak Voltage)
- Vrms (Root Mean Square Voltage)
- Vavg (Average Voltage)
- Vp (Peak Voltage)
- Vmax (Maximum Voltage)
- Vmin (Minimum Voltage)
- F (Frequency)
- T (Period)
- T+ (Positive Pulse Width)
- T- (Negative Pulse Width)
- Du+ (Positive Duty Cycle)
- Du- (Negative Duty Cycle)
To access and select displayed parameters:
- Press MENU.
- Navigate to "Voltage" or "Time" using the arrow keys.
- Press OK to enter the submenu.
- Select the desired parameters (e.g., Vpp, Vrms, Freq, Period) and press OK to confirm.
6.5 Waveform Saving and Browsing
The device can store up to 2500 DSO waveforms and allows for thumbnail browsing.
- Saving a Waveform: Press the SAVE key to save the current waveform.
- Browsing Saved Waveforms:
- Press MENU.
- Navigate to "Waveform" using the arrow keys.
- Press OK to enter the waveform manager and browse with thumbnails.
- Use F1 / F2 to page forward / backward.
- Press OK to enter the waveform information interface.
- Press OK again to show / hide specific parameters and grid.
- Deleting Waveforms:
- Press the AUTO key to delete the currently displayed waveform.
- Press the STOP key to delete all saved waveforms.
Image: Waveform saving and thumbnail browsing interface.
6.6 Square Wave Signal Output
The ET120M can output square wave signals at various frequencies for testing purposes.
- Available Frequencies: 1kHz, 10KHz, 100KHz, 1MHz.
- Setting Output Frequency:
- Press MENU.
- Navigate to "Gen Out" using the arrow keys.
- Press OK to enter the submenu.
- Select the desired output frequency (e.g., 1KHz, 10KHz) and press OK to confirm.
Image: Setting the square wave signal output frequency.
6.7 Display Settings
You can adjust the display for optimal viewing:
- Brightness:
- Press MENU.
- Navigate to "Light" using the arrow keys.
- Press OK to enter the submenu.
- Select the desired brightness level (8 levels available) and press OK to confirm.
- Grid:
- Press MENU.
- Navigate to "Grid" using the arrow keys.
- Press OK to enter the submenu.
- Set the grid function on/off and press OK to confirm.
7. Maintenance
7.1 Cleaning
To clean the device, use a soft, dry cloth. Do not use abrasive cleaners or solvents, as these may damage the casing or screen. Ensure no liquids enter the device.
7.2 Storage
When not in use, store the oscilloscope in a cool, dry place, away from direct sunlight and extreme temperatures. The recommended storage conditions are -10°C to +60°C with less than 90% relative humidity. The silicone protective cover helps protect the device during storage and transport.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low battery or power switch off. | Charge the battery using the USB cable. Ensure the power switch is in the ON position. |
| No waveform displayed. | Probe not connected, incorrect settings, or no signal input. | Check probe connection. Press AUTO for auto adaptation. Verify signal source. Adjust vertical sensitivity and time base. |
| Waveform is unstable. | Incorrect trigger settings. | Adjust the trigger level and trigger edge. Try different scan modes (Auto, Normal, Single). |
| Screen is too dim/bright. | Brightness setting is incorrect. | Adjust the brightness level via the MENU -> Light option. |
9. Specifications
Image: General characteristics and detailed specifications.
| Feature | Description |
|---|---|
| Display | 320x240 LCD screen |
| Display Area | 50mm x 40mm |
| Backlight | White, 8 levels of brightness adjustable |
| Impedance | 1X: 1MΩ / 10X: 10MΩ |
| Battery | 18650 Lithium battery |
| Auto Shutdown | No operation for 15 minutes |
| Waveform Storage | 2500 DSO waveforms |
| Dimensions | 124mm x 80mm x 35mm |
| Operating Conditions | 0°C ~ +40°C; < 75%RH |
| Storage Conditions | -10°C ~ +60°C; < 90%RH |
| Analog Bandwidth | 120MHz |
| Max Real-time Sampling Rate | 500MSps |
| Vertical Resolution | 8 bits |
| Vertical Accuracy | ±(5% + 0.2div) |
| Trigger Level | ±3.8div (0.1div per step) |
| Trigger Position | ±6div (0.1div per step) |
| Cursor Function | △V, △t, 1/△t |
| Coupling Method | DC/AC |
| Time Base Range | 6ns/div ~ 50s/div |
| Time Base Accuracy | ±(0.01% + 0.1div) |
| Scan Modes | Auto/Single/Normal |
| Trigger Slope | Rising / Falling |
| Record Length | 12div |
| Auto Configuration | Automatically sets time base and vertical amplitude |
| Automatic Measurement Functions | Vpp, Vrms, Vavg, Vp, Vmax, Vmin, F, T, T+, T-, Du+, Du- |
| Vertical Sensitivity Range | 1X: 50mV/div ~ 10V/div; 10X: 500mV/div ~ 100V/div |
10. User Tips
- Automotive Use: The ET120M is suitable for automotive diagnostic applications.
- Signal Generator: Yes, this device includes a signal generator function for square waves at 1kHz, 10kHz, 100kHz, and 1MHz.
11. Warranty and Support
For warranty information and technical support, please refer to the seller or the official TOOLTOP website. Keep your purchase receipt as proof of purchase for any warranty claims.
