VOLTCRAFT AT-400 Automotive Multimeter
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Product Information
Full details
The VOLTCRAFT AT-400 is a robust digital multimeter designed for automotive professionals and serious DIYers. Its key benefit lies in its specialized automotive measurement functions, including an inductive tachometer and dwell angle measurement, allowing for in-depth diagnostics. A potential caveat is its specialized nature, meaning it may offer more features than a beginner might immediately need.
All features
| Model Part Number | AT-400 |
|---|---|
| Brand | VOLTCRAFT |
Extended Product Information
FAQs
What is the CAT IV 600V rating for?
The CAT IV 600V rating indicates the multimeter's safety capability for performing measurements at the source of the low-voltage installation, such as the main electrical panel or overhead service lines. It ensures protection against transient overvoltages.
How do I use the inductive tachometer?
Attach the inductive clamp around one of the spark plug wires. Select the tachometer function and set the correct cylinder count (4, 5, 6, or 8). Start the engine and read the RPM on the display.
Can I measure temperature with this multimeter?
Yes, the AT-400 can measure temperature in Celsius (°C). However, it requires a separate compatible thermocouple temperature probe, which is typically sold separately.
What does the PEAK function do?
The PEAK function captures and displays the highest (PEAK+) or lowest (PEAK-) voltage or current spikes that occur during a measurement. This is useful for detecting transient signal anomalies.
How do I clean the AT-400?
Wipe the exterior with a soft, slightly damp cloth. Avoid using abrasive materials, solvents, or excessive moisture. Ensure the device is completely dry before use.
Is the multimeter waterproof?
The AT-400 is rated IP67, which means it is dust-tight and protected against immersion in water up to 1 meter for 30 minutes. However, it is not designed for continuous submersion.
What is the dwell angle measurement used for?
Dwell angle measurement is used to check the duration that the ignition points (in older systems) or electronic ignition module are closed, which directly affects the spark intensity. The AT-400 can measure this for engines with 4, 5, 6, or 8 cylinders.
Troubleshooting
Display is blank or dim
Check and replace the battery. Ensure the display lighting is activated if needed.
Inaccurate readings
Verify that the correct function and range are selected. Ensure test leads are securely connected and in good condition. Check battery level. For tachometer readings, ensure the inductive clamp is positioned correctly on the spark plug wire.
Continuity test not beeping
Ensure the leads are properly connected to the circuit and that a path exists. Check the continuity function and ensure the resistance is below the threshold for the beep. Test leads may be faulty.
Device powers off unexpectedly
The Auto-Power Off feature may have activated. If it occurs frequently, check battery level and replace if low.
Pros and Cons
Pros
- Specialized automotive diagnostic tools built-in
- Durable and watertight construction for workshop use
- Wide range of standard multimeter functions
- High CAT IV safety rating for electrical work
- Advanced features like PEAK/MIN/MAX capture
Cons
- May have more specialized features than a basic user requires
- Requires understanding of automotive systems for full benefit
- Temperature measurement requires a separate probe (not included in base package)
Setup, Compatibility & Care
Setup: Ensure the multimeter is equipped with appropriate, good-quality test leads. For temperature measurements, a compatible thermocouple probe is required. Select the correct function and range for the measurement you intend to take.
Compatibility: The AT-400 is designed for automotive electrical systems. It is compatible with standard 12V and 24V DC systems and suitable for testing ignition systems. Always refer to the vehicle's service manual for specific testing procedures and expected values.
Care: Keep the multimeter clean by wiping it with a soft, dry or slightly damp cloth. Avoid using solvents or abrasive cleaners. Ensure the test leads are free from damage. Store the multimeter in a dry, protected location when not in use. Periodically check battery levels and replace as needed.