TTRU1 - Measurement Megger - Free user manual and instructions
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| Product Type | Transformer Turns Ratio (TTR) Test Set |
| Brand | Megger |
| Model | TTRU1 |
| Measurement Range | Turns ratio 0.8:1 to 15,000:1 |
| Accuracy | ±0.1% for turns ratio |
| Test Voltage | 12 V DC |
| Excitation Current Range | 0 to 100 mA |
| Display | 5.7" color TFT LCD |
| Data Storage | 10,000 test results |
| Interfaces | USB, Bluetooth |
| Power Supply | Internal rechargeable Li-ion battery |
| Battery Life | Approximately 8 hours continuous use |
| Dimensions (W x H x D) | 260 x 150 x 100 mm |
| Weight | 2.5 kg |
| Safety Rating | CAT III 600 V |
| Operating Temperature | -10°C to +55°C |
| Storage Temperature | -30°C to +70°C |
| Protection Class | IP54 (dust and splash resistant) |
| Measurement Functions | Turns ratio, phase angle, excitation current, tap changer testing |
| Standards | IEC 61010-1, IEC 61326 |
| Warranty | 1 year standard |
| Calibration | Recommended annually |
Frequently Asked Questions - TTRU1 Megger
What is the Megger TTRU1 used for?
The Megger TTRU1 is a portable transformer turns ratio (TTR) test set used to verify the ratio and excitation characteristics of power and distribution transformers, ensuring proper windings and connection.
How do I perform a turns ratio test?
To perform a turns ratio test, connect the TTRU1 high-voltage leads to the transformer primary and low-voltage leads to the secondary, then select the test mode and press Start. The instrument automatically applies a low voltage and calculates the ratio.
What is the accuracy of the TTRU1?
The TTRU1 offers a high accuracy of ±0.1% for turns ratio measurements across its entire range, ensuring reliable and repeatable results.
How often should the TTRU1 be calibrated?
Calibration should be performed annually to maintain specified accuracy. Megger recommends returning the unit to an authorized service center or calibration facility.
Can the TTRU1 measure single-phase and three-phase transformers?
Yes, the TTRU1 can test both single-phase and three-phase transformers. For three-phase units, it automatically cycles through all phase combinations and provides vector group verification.
What is the test voltage and is it safe?
The test voltage is 12 V DC, which is safe for low-voltage insulation and does not stress the transformer windings. The instrument is designed with CAT III 600 V safety protection.
How long does the battery last and how do I charge it?
The internal Li-ion battery provides approximately 8 hours of continuous operation. It can be recharged via the included AC adapter or USB-C power supply.
How many test results can be stored?
The TTRU1 can store up to 10,000 individual test results in its internal non-volatile memory, which can be downloaded via USB or Bluetooth.
Does the TTRU1 come with a carrying case and leads?
Yes, the TTRU1 ships with a rugged carrying case, a full set of safety test leads, alligator clips, and a charging adapter.
Is the TTRU1 suitable for field use in harsh weather?
Absolutely. The TTRU1 has an IP54 rating for dust and splash resistance and operates in temperatures from -10°C to +55°C, making it suitable for demanding outdoor field use.
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Product information
Brand : Megger
Model : TTRU1
Category : Measurement