TOOLTOP ET120MC2 Digital Oscilloscope Signal Generator User Manual

1. Introduction

The TOOLTOP ET120MC2 is a full-featured, highly practical, and cost-effective handheld oscilloscope and signal generator. Designed for professionals in maintenance and R&D, it is also suitable for a wide range of applications including home appliance inspection, automotive diagnostics, scientific research, education, product development, and power testing.

This device combines the functionality of a dual-channel digital oscilloscope with a signal generator, offering a compact and portable solution for waveform analysis and signal generation.

2. Important Safety Reminders

WARNING: Improper use can lead to electric shock or damage to the device.

• When measuring an unknown voltage, always toggle the probe handle to the 10X position first. This prevents the input voltage from being too high and potentially damaging the oscilloscope.
• The 1X or 10X probe position is determined by the voltage being measured. The 1X probe position has a bandwidth of 5MHz, while the 10X probe position has a bandwidth of 100MHz.
• For frequencies higher than 5MHz, ensure the probe handle is set to 10X and the oscilloscope is also configured to 10X.
• Only use probes with a bandwidth of 100 MHz or higher.
• 1X mode is suitable for 0-80Vpp voltage measurements.
• 10X mode is suitable for 0-800Vpp voltage measurements.
• Always ensure proper grounding when connecting probes to avoid measurement errors or damage.

3. Package Contents

Please check the contents of your package upon receipt. If any items are missing or damaged, contact your vendor.

ET120MC2 Package:

• 1 x TOOLTOP ET120MC2 Oscilloscope
• 1 x 100MHz Oscilloscope Probe
• 1 x English User Manual
• 1 x Pair of Alligator Clip Cables
• 1 x USB Cable

ET120MC2 PRO Package:

• 1 x TOOLTOP ET120MC2 Oscilloscope
• 2 x 100MHz Oscilloscope Probes
• 1 x English User Manual
• 1 x Pair of Alligator Clip Cables
• 1 x USB Cable

4. Product Overview

The ET120MC2 features a compact design with a 2.4-inch 320x240 HD color LCD screen for clear waveform display. Its robust construction includes protective silicone covers for slip, drop, and shock resistance, ensuring a comfortable hand feel.

4.1 Keypad Introduction

The device features an intuitive keypad for easy operation. Refer to the diagram below for button functions:

• MENU: Accesses the main menu and acts as a 'Back' button.
• F1: Selects Channel CH1.
• F2: Long press to open/close Channel CH2; short press to select Channel CH2.
• SAVE: Saves the current waveform.
• AC/DC: Toggles input coupling (AC or DC).
• 1X/10X: Adjusts input magnification.
• 50%: Sets the trigger voltage to the average value of the waveform.
• TRIG: Selects trigger mode.
• EDGE: Selects trigger edge (Rising/Falling).
• MODE/OK: Switches between waveform scaling/shifting modes and confirms selections.
• Directional Keys (Up/Down): Increase/decrease trigger level.
• Directional Keys (Left/Right): In scaling mode, adjusts vertical sensitivity or time base. In shift mode, moves waveform horizontally.
• STOP: Stops/runs waveform display.
• AUTO: Automatic adjustment for waveform adaptation.

4.2 User Interface

The screen displays various parameters and waveform information. Below is a guide to the user interface elements:

1. Trigger channel
2. Trigger edge
3. Horizontal Time Base
4. Stop/Run indicator icon
5. Trigger mode
6. Signal source output prompt
7. Remaining battery level
8. Trigger voltage indication
9. Input coupling mode for channel CH2 (AC/DC)
10. 1X/10X mode indication for channel CH2 (matches probe setting)
11. Vertical sensitivity of channel CH2
12. Channel CH2
13. Directional keypad mode (+: waveform zoom, +: waveform move)
14. Channel CH1
15. Input coupling mode for channel CH1 (AC/DC)
16. 1X/10X mode indication for channel CH1 (matches probe setting)
17. Vertical sensitivity of channel CH1
18. Baseline indication for channel CH2
19. Baseline indication for channel CH1
20. Waveform horizontal position

5. Setup

5.1 Charging the Device

The ET120MC2 is equipped with a built-in rechargeable lithium battery. To charge the device, connect it to a DC5V/1A/2A power source using the provided Type-C USB cable. The battery level indicator on the screen will show charging status.

5.2 Probe Check and Compensation

Before using the oscilloscope, it is crucial to perform a probe check and compensation to ensure accurate measurements. An uncompensated or biased probe can lead to significant measurement errors.

1. Set Signal Source Output:
   Press the 【MENU】 key to enter the main menu. Select "Gen Out" and press 【MODE/OK】 to enter the signal source interface.
   Press 【F1】 to select "1KHz" and press 【MODE/OK】 to confirm.
   Press 【F2】 to select "3Vpp" and press 【MODE/OK】 to confirm.
   Press the 【SAVE】 key, choose "50%", and press 【MODE/OK】 to confirm.
   Finally, press the 【MENU】 key to exit the menu.
2. Connect Probe:
   Insert the MCX connector of the red and black clip wire into the output port of the signal source.
   Press the 【1X/10X】 key to set the probe attenuation to 10X. Connect the probe's MCX connector to the oscilloscope and set the switch on the probe to 10X.
   Hook the probe's hook onto the red clip of the signal source output MCX connector wire, and clip the probe's black clip onto the black clip of the MCX connector wire.
3. Auto-Adjust: Press the 【AUTO】 key.
4. Check Waveform:
   Observe the shape of the displayed waveform. If it is not "properly compensated" (a clean square wave), adjust the variable capacitance on the probe with a non-metallic screwdriver until the waveform is correct.

6. Operating Instructions

This section details the various functions and operations of your TOOLTOP ET120MC2.

6.1 Scaling and Shift Mode

Press the 【MODE/OK】 key to switch between scaling mode and shift mode. The directional keys will have different functions depending on the active mode.

• Waveform Scaling Mode:
  Use the ▲/▼ keys to adjust vertical sensitivity.
  Use the ◄/► keys to adjust the time base.
• Waveform Shift Mode:
  Use the directional keys to move the waveform. Note that in Single/Normal mode, the waveform can only move vertically.

Amplify/Shrink Waveform:

• Amplify: In scaling mode, press 【▼】 to enlarge vertically, and ◄ to enlarge horizontally.
• Shrink: In scaling mode, press 【▲】 to shrink vertically, and ► to shrink horizontally.

Move Waveform:

In shift mode, use the directional keys to move the waveform in the corresponding direction.

6.2 Waveform Scanning Modes

• Auto Mode: Press 【TRIG】 until "Auto" is displayed. This mode is ideal for measuring periodic signals (sine, square, clock, PWM waves). The waveform updates continuously, and is synchronized when trigger conditions are met.
• Normal Mode: Press 【TRIG】 until "Normal" is displayed. This mode updates the waveform when the input signal meets the trigger condition. It captures the last waveform in a burst signal.
• Single Mode: Press 【TRIG】 until "Single" is displayed. Adjust the trigger line, then release the signal. The oscilloscope will automatically suspend the frame signal once it captures a signal meeting the trigger condition. Press 【STOP】 to start the next sample. This mode captures the first waveform in a burst signal.

6.3 Input Coupling (AC/DC)

Press the 【AC/DC】 key to switch between AC and DC coupling methods.

• AC Coupling: Blocks the DC component of the signal, allowing only the AC component to pass.
• DC Coupling: Allows both AC and DC components of the signal to pass.

6.4 Input Magnification (1X/10X)

Ensure the probe handle's magnification switch matches the setting on the oscilloscope. Press the 【1X/10X】 key on the oscilloscope to switch the input magnification to match your probe's setting.

6.5 Waveform Saving and Viewing

• Save Waveform: Press the 【SAVE】 key to save the current signal waveform and its measurement data (vertical sensitivity, time base).
• View Saved Waveform:
  Press the 【MENU】 key, select "Waveform", then press 【MODE/OK】 to enter the waveform file manager. This manager supports thumbnail view.
  Select a waveform and press 【MODE/OK】 to view it in full screen. Press 【MODE/OK】 again to display vertical sensitivity, time base, and background grid lines.
  To view measurement parameters for CH1, press 【F1】. For CH2, press 【F2】.
• Delete Saved Waveform:
  To delete a selected waveform, press the 【AUTO】 key, then 【MODE/OK】.
  To delete all waveforms, press the 【STOP】 key.
• Page Flip in Waveform Manager: In thumbnail view, press 【F1】 to page forward, and 【F2】 to page backward.

6.6 Signal Source Output Configuration

The ET120MC2 can generate various waveforms. To configure the signal source output:

1. Press the 【MENU】 key, navigate to "Gen Out", and select it.
2. Press 【MODE/OK】 to enter the signal source interface.
3. Press 【F1】 to open the frequency menu.
4. Press 【F2】 for the amplitude menu.
5. Press 【SAVE】 for the duty cycle menu (for square waves only).
6. After selecting the desired output frequency, amplitude, or duty cycle, press 【MODE/OK】 to confirm and apply the settings.
7. Press 【MODE/OK】 directly to switch between sine wave, triangular wave, and square wave.
8. Connect the probe's hook to the signal output ring in the upper left corner of the oscilloscope to view the generated waveform.

6.7 Adjusting Screen Brightness

Press 【MENU】, select "Light", then press 【MODE/OK】. Choose the appropriate brightness level (1-8 levels) and press 【MODE/OK】 to apply.

6.8 Setting Key Tone

Press 【MENU】, select "Beep", then press 【MODE/OK】. Choose on/off and press 【MODE/OK】 to confirm. Press 【MENU】 to exit.

6.9 Horizontal Baseline Deviation Calibration

If there is a deviation between the baseline and the left arrow when no signal is input:

1. Unplug the probe and USB cable.
2. Press 【MENU】, select "Calibrate".
3. Press 【MODE/OK】 to conduct horizontal baseline deviation calibration.

7. Specifications

The following table details the technical specifications of the TOOLTOP ET120MC2 Digital Oscilloscope Signal Generator.

8. Troubleshooting

This section addresses common issues you might encounter and provides solutions.

• 1. Can't turn on or achieve a full charge?
  The battery may be depleted. Use a 5V/1A or higher charger to charge the device. Charging via computer USB may not provide sufficient power for a full charge when the battery is very low.
• 2. No waveform, only a single line on the screen that doesn't move?
  First, check if the 【STOP】 key is pressed, suspending the waveform display. Press 【STOP】 again to refresh. If still no waveform, press 【AUTO】. If the issue persists, verify that the input signal source is outputting a signal, and check for short circuits or broken probe lines using a multimeter.
• 3. Why is the voltage value data 0?
  Adjust the vertical sensitivity and time base (sampling rate) until a clear and complete periodic waveform is displayed on the screen, with both the top and bottom visible. This will allow for correct voltage value data display.
• 4. Why is the frequency value data 0?
  Ensure the trigger mode is "Auto" and the time base range is between 6nS and 200mS. Adjust the vertical sensitivity and time base until a clear, complete, and triggered periodic waveform is displayed. The red arrow (trigger level) should be fixed between the top and bottom of the waveform.
• 5. Why is the duty cycle 0?
  Similar to frequency measurement, ensure "Auto" trigger mode and time base range (6nS-200mS). Adjust the trigger line between the waveforms to fix them, ensuring a clear periodic waveform for correct duty cycle data.
• 6. Is the AC coupling the same as the DC coupling waveform?
  For symmetric AC signals (e.g., from a signal generator or household 220V AC), the AC coupling waveform will appear similar to the DC coupling waveform. However, with an asymmetric AC signal or a pulsating DC signal, the waveform will only move up and down when coupling is switched.
• 7. No waveform, just multiple lines jumping up and down?
  Set the trigger mode to "Auto" and press 【AUTO】 to automatically adapt the waveform. If this doesn't resolve it, check if the probe clamp is properly grounded or if the probe clamp end is disconnected. Use a multimeter to verify the probe's integrity.
• 8. Waveform wobbles around and can't be fixed?
  Adjust the trigger voltage: In trigger mode, use the ▲/▼ keys (lower right) to adjust the red arrow (trigger level) between the top and bottom of the waveform. This should trigger and fix the waveform. Alternatively, enable the automatic 50% trigger function (refer to section 6.6).
• 9. Can't capture pulse waveforms or digital logic signals?
  Use "Single" or "Normal" trigger mode. Adjust the trigger voltage so the red arrow is positioned correctly within the waveform to capture it.
• 10. No waveform when measuring batteries or other DC voltages?
  Battery voltage is a stable DC signal. When using AC coupling, the DC signal is isolated, resulting in no waveform. Switch to DC coupling, and adjust the vertical sensitivity. You will observe an upward or downward deviation of the linear waveform.
• 11. Significant voltage degradation when measuring signals above 5 MHz?
  When measuring signals above 5MHz, the probe should be set to 10X, and the oscilloscope's input mode should also be set to 10X. This is due to the oscilloscope probe line's capacitance (100-300pF), which attenuates signals at higher frequencies. Matching the probe and oscilloscope settings ensures proper impedance and signal integrity.

9. User Tips

• Software Compatibility: The provided PC software is designed for Windows 10 and above.
• Software Installation: Before installing the PC software, temporarily disable your antivirus and firewall to prevent false positives that might interfere with the installation.
• Language Support: The device's user interface is typically in English. The included manual is also in English.

10. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures. Recommended storage conditions are -10°C to +60°C with <90% RH.
• Battery Care: For long-term storage, ensure the battery is partially charged (around 50%) to prolong its lifespan.
• Auto Shutdown: The device features an automatic shutdown function after 15 minutes of no operation to conserve battery life.

11. Warranty and Support

For detailed warranty information, please refer to the terms provided by your retailer or the manufacturer's official website.

For additional support, including a comprehensive user manual in PDF format, please refer to the following resource:

• User Manual (PDF): Download PDF Manual
• PC Software Download: Download Software (Note: Compatible with Windows 10 and above. Disable antivirus/firewall during installation.)