TDR-420 - Measuring equipment Sonel - Free user manual and instructions
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| Product Type | Time Domain Reflectometer (TDR) |
| Model | TDR-420 |
| Brand | Sonel |
| Measurement Range | 0 to 20 km |
| Cable Types | Coaxial, twisted pair, power cables |
| Distance Accuracy | ±1% of range ±1 m |
| Pulse Widths | Selectable: 10 ns to 10 µs |
| Display | LCD with backlight |
| Battery Type | 4 x AA (alkaline or rechargeable NiMH) |
| Battery Life | Approx. 40 hours continuous |
| Dimensions (W x H x D) | 230 x 120 x 55 mm |
| Weight | Approx. 0.8 kg |
| Memory | Stores up to 100 waveforms |
| Interface | USB for data transfer |
| IP Rating | IP54 (dust and splash proof) |
| Safety | CAT III 300V |
| Operating Temperature | 0°C to 50°C |
| Storage Temperature | -20°C to 60°C |
| Includes | Test leads, carrying case, user manual |
| Maintenance | Clean with damp cloth; avoid solvents |
Frequently Asked Questions - TDR-420 Sonel
How do I change the battery in the Sonel TDR-420?
Open the battery compartment on the back, remove old batteries, and insert 4 new AA batteries observing polarity. Rechargeable NiMH batteries are also supported.
What is the maximum cable length the TDR-420 can measure?
The maximum range is 20 km, depending on cable type and quality. For accurate results, use appropriate pulse width settings.
Can I measure faults on live cables with the TDR-420?
No, the TDR-420 is designed for de-energized cables only. Always ensure the cable is disconnected from any power source before testing.
How do I calibrate the Sonel TDR-420?
Calibration is performed via the menu: connect a known length of cable (e.g., 100 m) and follow the calibration procedure in the manual. The device adjusts automatically.
What type of batteries does the TDR-420 use?
It uses 4 AA batteries, either alkaline or rechargeable NiMH. Battery life is approximately 40 hours for alkaline.
Is the TDR-420 waterproof?
The device has an IP54 rating, meaning it is protected against dust and splashing water, but not fully waterproof. Avoid submersion.
How to update the firmware on the TDR-420?
Firmware updates are done via USB connection to a PC. Download the latest firmware from the Sonel website and follow the update instructions in the manual.
Can I use the TDR-420 with different cable impedances?
Yes, the TDR-420 supports various impedances such as 50 Ω, 75 Ω, and 100 Ω. Select the appropriate cable type in the settings.
How do I interpret the waveform on the TDR-420?
The waveform shows reflections from impedance changes. A positive pulse indicates an open circuit, a negative pulse a short. Use the cursor functions to measure distance.
Where can I find spare parts or accessories for the TDR-420?
Spare parts and accessories (test leads, adapters, carrying case) are available from Sonel authorized dealers or the Sonel online store. Check the manual for part numbers.
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USER MANUAL TDR-420 Sonel
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Product information
Brand : Sonel
Model : TDR-420
Category : Measuring equipment