TAU3 - Measuring instrument Megger - Free user manual and instructions
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| Product Type | Transformer Turns Ratio Tester |
| Brand | Megger |
| Model | TAU3 |
| Dimensions (H x W x D) | 170 x 100 x 55 mm |
| Weight | 0.6 kg (including batteries) |
| Power Supply | 6 x 1.5 V AA alkaline batteries or rechargeable NiMH |
| Battery Life | Approximately 8 hours of continuous use |
| Measurement Range (Turns Ratio) | 0.8 to 2000 |
| Accuracy | ±0.1% of reading |
| Test Voltage | 40 V AC maximum |
| Display | Backlit LCD, 4-line, 16 characters per line |
| Memory | Up to 200 test results |
| Interfaces | USB 2.0 for data transfer |
| Operating Temperature | -10°C to +50°C |
| Storage Temperature | -20°C to +60°C |
| Humidity Range | 0 to 95% non-condensing |
| Safety Standards | IEC 61010-1, CAT II 300 V |
| Ingress Protection | IP40 |
| Main Functions | Turns ratio, phase displacement, excitation current, winding resistance |
| Spare Parts & Repairability | Available through authorized Megger service centers |
| Maintenance & Cleaning | Wipe with a damp cloth; no solvents; calibrate annually |
| General Information | Portable, rugged design for field use; complete with test leads and soft carry case |
Frequently Asked Questions - TAU3 Megger
How do I connect the test leads for a single-phase transformer?
Connect the red lead to the high voltage winding (H1, H2) and the black lead to the low voltage winding (X1, X2). Ensure the transformer is de-energized before connection.
What does the 'Phase Displacement' measurement indicate?
It measures the phase angle difference between primary and secondary windings, helping to identify winding connections (e.g., Delta-Wye) and potential faults.
How can I save and download test results?
Press the 'Save' button after a test to store in internal memory. Connect via USB to a PC and use Megger's software to download results.
What batteries does the TAU3 use and how long do they last?
It uses 6 AA batteries (alkaline or NiMH). Alkaline batteries last about 8 hours of continuous use; rechargeable NiMH may last slightly less.
Can the TAU3 test auto-transformers?
Yes, the TAU3 can test auto-transformers. Connect the leads to the common and series windings accordingly; the instrument automatically detects the configuration.
What is the maximum turns ratio the TAU3 can measure?
The maximum measurable turns ratio is 2000. For ratios above this, use an external voltage divider or contact Megger support.
How do I perform a zero adjustment?
Short the test leads together and press the 'Zero' button. The display will show zero. Perform this before each series of tests for accuracy.
Is the TAU3 protected against short circuits?
Yes, the instrument has built-in overload protection. If a short circuit occurs, the test current is automatically limited to prevent damage.
What should I do if the display shows 'Error'?
Check all connections, ensure the transformer is de-energized, and verify the leads are not damaged. If the error persists, consult the manual or contact support.
How often should the TAU3 be calibrated?
Megger recommends annual calibration to maintain accuracy. Calibration can be performed by an authorized service center.
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