MTO300 - Measurement Megger - Free user manual and instructions
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| Product Type | Motor and Phase Rotation Tester |
| Brand | Megger |
| Model | MTO300 |
| Category | Measurement |
| Dimensions (H x W x D) | 185 x 85 x 40 mm |
| Weight | Approx. 340 g (including batteries) |
| Power Supply | 2 x AA 1.5V batteries |
| Main Functions | Phase rotation indication, motor rotation direction, continuity test, non-contact voltage detection |
| Phase Rotation Indication | LED and audible beeper for clockwise/counterclockwise |
| Motor Rotation Direction | Three-phase motor orientation test |
| Continuity Test | Audible beeper for resistance < 100 kΩ |
| Non-Contact Voltage Detection | Detects voltages from 90V to 1000V AC |
| Safety Rating | CAT IV 600V, CAT III 1000V |
| Ingress Protection | IP40 |
| Operating Temperature | -10°C to 55°C |
| Storage Temperature | -20°C to 60°C |
| Battery Life | Approx. 100 hours (alkaline) |
| Auto Power Off | After 15 minutes inactivity |
| Maintenance and Cleaning | Wipe with a damp cloth; do not use solvents |
| Spare Parts and Repairability | Battery compartment cover, test leads; repair by qualified personnel only |
Frequently Asked Questions - MTO300 Megger
How do I test phase rotation with the MTO300?
Connect the test leads to the three-phase system. Press and hold the Phase Rotation button. The LEDs will indicate clockwise (CW) or counterclockwise (CCW) rotation, accompanied by a beeper.
Can the MTO300 measure voltage?
The MTO300 has a non-contact voltage detection (NCV) function. It detects AC voltages from 90V to 1000V without contact. For direct voltage measurement, use a dedicated voltmeter.
How do I check motor rotation direction?
Connect the test leads to the motor terminals. Press the Motor Rotation button. The display shows the direction (CW or CCW) and the beeper sounds accordingly.
What type of batteries does the MTO300 use?
It uses two AA 1.5V batteries (alkaline recommended). Battery life is approximately 100 hours with continuous use.
How do I perform a continuity test?
Select the continuity mode. The tester beeps continuously when the resistance is less than 100 kΩ. Use this to check for open or short circuits.
Is the MTO300 safe for high-voltage environments?
Yes, it is rated CAT IV 600V and CAT III 1000V, making it suitable for most commercial and industrial electrical systems.
How do I replace the batteries?
Turn off the tester. Remove the battery compartment screw and slide off the cover. Replace both batteries with new AA cells, ensuring correct polarity. Replace cover and screw.
What does the auto power off feature do?
To conserve battery, the MTO300 automatically turns off after 15 minutes of inactivity. Press any button to wake it up.
Can I test DC voltage with the MTO300?
No, the MTO300 is designed for AC phase rotation, motor direction, continuity, and non-contact AC voltage. It cannot measure DC voltage.
How do I clean the MTO300?
Use a damp cloth with mild soap if necessary. Do not use solvents or abrasives. Ensure the tester is dry before storing.
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