Techometer calibration service

With the aim of serving customers with the best after-sales services, EMIN Vietnam has established the Equipment Inspection - Calibration - Repair Service Center. With the support from numerous equipment manufacturers in the world, EMIN Vietnam possesses well-prepared calibrating instruments. EMIN Vietnam has successfully repaired and calibrated specialized equipment in Vietnam, ensuring the quickness, effectiveness and convenience for customers. Only few technical trading company in Vietnam do possess this technical capacity including EMIN Vietnam.


>> Tachometer
- A type of measuring device that is capable of measuring the number of revolutions of an object around its axis like the speed of rotation of a machine and equipment motor to check whether the measuring equipment is qualified.


>> Other information
The Tachometer can allow us to check the speed of rotational movements where the rotation is defined as follows: a movement in which any two points of the object are always fixed. during motion. The line connecting these two points is called the rotation axis, all the points on the axis of rotation are fixed, the points outside the rotation axis will rotate on circular orbits in the plane perpendicular to the axis of rotation and centered on Rotary. For example: the movement of the Earth around its axis; or a point on a rolling wheel, a point on an electric propeller. This is a complex motion, consisting of the translational motion of the object's center of gravity and the rotation around a certain axis. The object's center mass can be regarded as a point substance.
There are 3 types of rotary tachometers: Non-contact, Contact and lightning frequency
♦ Non-contact measurement method (reflex measurement)
The rotation speed will be measured by measuring the time of the reflected beam at the object to be measured. The device will emit an infrared beam, which will be reflected back at the object to be measured by a reflective sheet glued on the object to be measured. However, it is important to note that this method of measurement is that the maximum distance between the reflex reflector and the measuring equipment does not exceed 350 mm. Non-contact measurements range from 20 rpm to 100,000 rpm. This measurement method is better than the contact measurement method, but it also has its own disadvantages because it is not always possible to stick a reflective sheet onto the object under test.
♦ Contact measurement method
- The rotation speed of the object under test will be converted to an electrical signal by the sensor, which will be analyzed and displayed by the device.
♦ Method of measurement using lightning frequency
 
>> Calibration of the rotary tachometer
Calibration Types
- Rotational speed indication calibration - Contact
- Rotational speed indication calibration - Non-Contact
- Rotational speed indication calibration - Use transmitter and LED
- Linear Speed ​​indication Calibration
Calibration means
- Tachometer 
- Signal generator
- LED light
- Reflective glue
Working standard / secondary standard
- Tachometer Tester
+ Range: 55 ~ 350 rpm
+ Accuracy: ± 0.5 rpm
- Signal generator
+ Range: 0.5 ~ 17kHz square pulse at 5V
+ Accuracy: ± 0.0001% of full scale.
Calibration conditions
When performing a calibration, the following conditions must be met:
The calibration site should be bright enough, away from heat sources, away from wind sources, and not vibrated.
The temperature and humidity where calibration ensures the following conditions:
   + Temperature: (23 ± 5) ºC.
   + Humidity: (40 ÷ 80)% RH.
Prepare the calibration
Perform calibration
- Rotational speed indication calibration - Contact
- Rotational speed indication calibration - Non-Contact
- Rotational speed indication calibration - Use transmitter and LED
- Linear Speed ​​indication Calibration
Calibration result treatment
- Calculate the permissible error.
- Calculation of measurement uncertainty.


For further information about calibration service, visit our website at: https://emin.vn/en_US/calibration-inspection-service-985/pc.html


For further information and calibration requirements, Please contact

Equipment Inspection - Calibration - Repair Service Center - EMIN Vietnam JSC 

 Adress: No 11, Hoang Cau Moi Street, Trung Liet Ward Dong Da District, Ha Noi City

Email: hn@emin.vn - Hotline: 097.251.2864 (Mr. Truong)