Description:
The TOOLTOP ET928 is a 3-in-1 handheld testing device that combines the functions of an oscilloscope, a digital multimeter, and a signal generator. However, despite some listings mentioning “20MHz,” its actual oscilloscope bandwidth is 12MHz with a 50MS/s sampling rate. Moreover, it is designed for electronic hobbyists, engineers, and technicians who need a versatile tool. In addition, the ET928 works well for circuit debugging, routine maintenance, and automotive diagnostics. As a result, users benefit from an all-in-one solution that saves both time and space in their toolkit.
Key features:
-
- 3-in-1 functionality: Combines an oscilloscope, multimeter, and signal generator in a single, compact device.
- Color display: Features a 320×240 pixel color screen with a white backlight, providing clear and easy-to-read measurements and waveforms.
- Portability: Weighing approximately 250g, its lightweight design makes it easy to carry for on-site measurements and repairs.
- Data storage: Includes internal storage for up to 100 sets of multimeter data and 10 oscilloscope waveforms, which can be saved with a single “SAVE” button.
- Rechargeable battery: Powered by a 1500mAh lithium battery that provides about 6 to 8 hours of use per charge. It also features a low-battery reminder and an automatic sleep function to conserve power.
- USB-C charging: Uses a modern Type-C port for convenient charging.
Performance and specifications
Oscilloscope
-
- Analog bandwidth: 12MHz.
- Max real-time sampling rate: 50MS/s.
- Input resistance: 1MΩ (for 500mV/div to 200V/div range).
- Coupling: DC/AC.
- Trigger modes: Auto, Normal, and Single, with rising and falling edge trigger types.
- Automatic measurement: Displays key waveform parameters like peak-to-peak voltage (
Vppcap V sub p p end-sub
𝑉𝑝𝑝
), average voltage (
Vavgcap V sub a v g end-sub𝑉𝑎𝑣𝑔
), and root mean square voltage (
Vrmscap V sub r m s end-sub𝑉𝑟𝑚𝑠
).
Multimeter:
-
- DC voltage: Measures up to 1000V.
- AC voltage: Measures up to 750V.
- DC/AC current: Measures up to 10A.
- Resistance: Measures up to 60MΩ.
- Capacitance: Measures up to 100mF.
- Frequency: Measures up to 10MHz.
- Diode and continuity tests: Supported functions.
Signal generator :
-
- Waveform types: Can generate sine, square, and triangular waves.
- Frequency ranges:
-
- Sine wave: 100Hz to 100kHz.
- Square wave: 100Hz to 20kHz.
- Triangular wave: 100Hz to 50kHz.
-
- Output amplitude: Adjustable in multiple steps from 0Vpp to 3Vpp.
Intended use :
The TOOLTOP ET928 is an ideal tool for users who need the core functions of a benchtop oscilloscope, multimeter, and signal generator in a single, portable, and affordable package. It is well-suited for:
-
- Educational purposes: For students learning basic electronics and signal analysis.
- DIY electronics projects: Troubleshooting and testing circuit boards.
- Field technicians: For on-site repairs of home appliances, automobiles, and other electronics.
Limitations:
While the ET928 is highly versatile for its price point, it’s important to be aware of its limitations compared to professional-grade equipment:
- Bandwidth: The 12MHz bandwidth is relatively low for measuring high-frequency signals.
- Single channel: The oscilloscope features only one channel, which limits its ability to analyze relationships between two simultaneous signals.
- Display: While color, the 2.4-inch screen is small and offers lower resolution compared to dedicated benchtop models.
- User interface: Some users have reported that navigating the menu for stored data can be tedious.
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