1. Product Overview
The TOOLTOP ET31C/32C is a versatile automotive signal generator and multimeter designed for vehicle maintenance and electrical testing. It combines the functions of a signal generator, capable of simulating various automotive signals, with a full-featured multimeter for comprehensive electrical measurements.
Figure 1: TOOLTOP ET32C Automotive Signal Generator Multimeter
2. Package Contents
Please check the package carefully to ensure all items are present and undamaged.
- 1 x Signal Generator Multimeter (ET31C or ET32C model)
- 1 x Pair of Test Leads (Red and Black)
- 1 x Pair of Crocodile Clamp Wires
- 1 x English User Manual
- 1 x Type-C USB Cable (Only for ET32C model)
Figure 2: Contents of the product package.
3. Setup and Powering On
3.1 Powering the Device
- ET32C Model: This model features a built-in 4.2V lithium battery. Charge the device using the provided Type-C USB cable.
- ET31C Model: This model is powered by 3 x 1.5V AAA batteries (not included). Open the battery compartment on the back of the device and insert the batteries, observing correct polarity.
3.2 Connecting Test Leads
Connect the red test lead to the VΩHz input jack and the black test lead to the COM input jack for multimeter functions. For signal output, connect the leads to the VΩHz and V-Ω-OUT jacks as required by the specific function.
Figure 3: ET32C device with test leads connected.
4. Operating Instructions
4.1 Device Interface and Buttons
The device features a 2.8-inch 320x480 resolution display. Screen brightness is adjustable from 5% to 100%.
Figure 4: Overview of the device interface and button layout.
- USB Charging Interface: (Only for ET32C) Located on the side for charging.
- 2.8-inch HD Display: Main screen for displaying readings and settings.
- Function Buttons (Fn1-Fn4): Context-sensitive buttons for various operations.
- Switch/Off Button: Powers the device on or off.
- Mode Switch Button: Toggles between different operating modes (e.g., Signal Generator, Multimeter).
- Direction Control and OK Button: Used for navigation and selection within menus.
- Jack: Input/output ports for test leads.
4.2 Signal Generator Functions
The signal generator can produce various waveforms and simulate automotive signals.
Video 1: A demonstration of the TOOLTOP ET32C's various signal generation and multimeter functions, including sine wave, square wave, combined wave, scanning wave, voltage output, signal storage, and multimeter measurements.
4.2.1 Adjustable Signal Parameters
The output frequency is adjustable from 1Hz to 9999Hz, and the output amplitude (peak-to-peak voltage) is adjustable from -12V to +12V.
Figure 5: Parameters such as Frequency, Vp-p (Voltage Peak-to-Peak), and Time can be set manually.
4.2.2 Multiple Signal Output
The device can generate sine wave, square wave, combined wave, scanning wave, and DC wave signals.
Figure 6: Examples of Sine Wave, Square Wave, Combined Wave, Scanning Wave, Voltage, and Coil Control outputs.
4.2.3 Automotive Signal Simulation
Simulate Hall type and magnetoelectric crankshaft signals and cam signals for gasoline and diesel vehicles.
Figure 7: The device functions as a vehicle maintenance signal source, offering voltage output from -12V to +12V, frequency output from 1Hz to 9999Hz, and simulation of Hall/Magnetoelectric type crankshaft cam signals.
4.2.4 Combined Wave Output (Missing Teeth Signal)
The missing tooth signal can be set arbitrarily (e.g., combined wave 58+2, 10+1) without connecting to a computer. The maximum number of combined waves can be set to 99+99.
Figure 8: Illustration of combined wave output, including missing teeth signal set, with a maximum setting of 99+99.
4.2.5 Scanning Wave Signal Output
Output scanning waves to simulate the process of crankshaft cam signals running from low speed to high speed.
Figure 9: The device can generate scanning wave signals, simulating analog signals running from low speed to high speed. The effect is for reference only; refer to the actual waveform signal output.
4.2.6 Voltage Output
Analog voltage output is adjustable from -12V to +12V, with a step value of 1V.
Figure 10: Demonstration of voltage output from -12V to +12V, measured by an external multimeter.
4.2.7 Coil Control
Supports ignition coil control, solenoid valve control, and relay control (only supports coil control of 30V/1A and below).
Figure 11: The device can check if the ignition coil is normal and supports ignition coil, solenoid valve, and relay control (for coils 30V/1A and below).
4.2.8 Signal Storage and Loading
The instrument supports 50 groups of signal waveform storage. Waveforms can be saved to specified locations and loaded later.
Figure 12: The device allows for signal storage, with up to 50 sets of waveform parameters being stored.
4.3 Multimeter Functions
The device can measure various electrical parameters.
Figure 13: The multimeter function can measure DC voltage, AC voltage, resistance, diode, on-off (continuity), capacitance, frequency, and duty ratio.
- DC Voltage: Measures direct current voltage.
- AC Voltage: Measures alternating current voltage.
- Resistance: Measures electrical resistance.
- Diode: Tests diodes for proper function.
- Continuity: Checks for electrical continuity (on/off detection).
- Capacitance: Measures capacitance.
- Frequency: Measures signal frequency.
- Duty Cycle: Measures the duty cycle of a signal.
5. 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.
- Battery Care (ET31C): Remove AAA batteries if the device will not be used for an extended period to prevent leakage.
- Battery Care (ET32C): Recharge the built-in lithium battery regularly to maintain its lifespan, even if not in frequent use.
- Test Leads: Inspect test leads and crocodile clamps regularly for any signs of wear or damage. Replace if necessary.
6. Troubleshooting
- Device does not power on:
- For ET31C, check if AAA batteries are inserted correctly and have sufficient charge.
- For ET32C, ensure the built-in battery is charged. Connect to a USB power source.
- No signal output:
- Verify that the correct signal type and parameters are selected.
- Check connections of test leads to the output jacks.
- Ensure the 'Output' function is enabled on the screen.
- Multimeter readings are inaccurate:
- Ensure test leads are properly connected to the correct input jacks (VΩHz and COM).
- Check if the correct measurement mode is selected.
- Verify that the test leads are not damaged or corroded.
- Screen is dim or unresponsive:
- Adjust screen brightness settings.
- Ensure sufficient battery charge.
7. Specifications
General Specifications:
- Display Screen: 2.8 inch, 320 x 480 resolution
- Touch Screen: Not supported
- USB Interface: Type-C USB (ET32C only)
- Battery:
- ET31C: 3 x 1.5V AAA batteries (not included)
- ET32C: Built-in 4.2V lithium battery
- Storage Temperature: -20°C to 60°C (-4°F to 140°F)
- Working Temperature: 0°C to 50°C (32°F to 122°F)
- Working Humidity: <85% RH (non-condensing)
- Product Dimensions (LxWxH): 134 mm x 69 mm x 25 mm
- Product Weight: 125g (excluding accessories)
Figure 14: Product dimensions: 134mm (length), 69mm (width), 25mm (height).
Signal Generator Parameters:
- Sine Wave/Square Wave Frequency Range: 1Hz ~ 9999Hz
- Sine Wave/Square Wave Frequency Step: 1Hz
- Sine Wave/Square Wave Peak Range: -12V ~ +12V
- Sine Wave/Square Wave Peak Step: 1V
- Scanning Wave Scanning Time Range: 1s ~ 999s
- Maximum Number of Combined Wave Combinations: 99+99
- Output Voltage Range: -12V ~ +12V
- Output Voltage Step: 1V
- Coil Control Power: Below 30V/1A
- Waveform Storage: 50 sets
- Duty Setting: 1% ~ 99% (only for square wave)
Multimeter Parameters:
| Function | Range | Resolution | Accuracy |
|---|---|---|---|
| AC Voltage (40~500Hz) | 400mV | 0.1mV | 2% + 3 |
| 4.000V | 0.001V | ||
| 40.00V | 0.01V | ||
| 400.0V | 0.1V | ||
| DC Voltage | 400mV | 0.1mV | 2% + 3 |
| 4.000V | 0.001V | ||
| 40.00V | 0.01V | ||
| 400.0V | 0.1V | ||
| 1000V | 1V | ||
| Resistance | 400.0Ω | 0.1Ω | 0.5% + 3 |
| 4.000KΩ | 0.001KΩ | ||
| 40.00KΩ | 0.01KΩ | ||
| 400.0KΩ | 0.1KΩ | ||
| 4.000MΩ | 0.001MΩ | ||
| Diode | 1.500V | 0.001V | 10% |
| Capacitance | 51.20nF | 0.01nF | 2% + 5 |
| 512.0nF | 0.1nF | ||
| 5.120uF | 0.001uF | ||
| 51.20uF | 0.01uF | ||
| 100.0uF | 0.1uF | 5% + 5 |
Table 1: Multimeter Specifications (Functions, Range, Resolution, Accuracy)
- Maximum Resistance for On/Off Detection: 30 Ω
- Display: 4000 counts
- Update Rate: 3 times per second
8. Warranty and Support
This product is covered by the standard AliExpress Buyer Protection policy. For specific warranty details, returns, or technical support, please refer to your purchase platform or contact the seller directly.
- Free Returns: Available within 90 days (check platform for eligibility).
- Fast Delivery Guarantee: Potential coupons for late delivery.
- Security & Privacy: Your personal details are protected.
For further assistance, please visit the Tooltop Choice Store on AliExpress.
