Very low-cost Robotic tool -The Servo Tester.

It is a very low-cost device at less than Rs 200/- absolutely required for testing small servo motors. It is. a must device for hobby robotics. It is basically to both test and ensures the center position ( at 90 degrees) of a (non-continuous spinning only ) small Servo Motor which is very important for robotic applications as, the unit that is procured from the market, its shaft may not be in the center position. Thus if used without fixing its shaft position in the center, for any robotic application, say a humanoid biped, hexapod, pick and place, gripper, claw, etc during assembling,  then it gives erratic operation at the time of switch on even if the programming is correct. 90-degree position of the shaft is the center position where from the non-continuous servo shaft moves exactly – 90 degrees ie to the left from center to zero and similarly + 90 degrees to the right from the center position to 180 degrees while right time period 1ms to 2ms train of pulses are fed to its sensing terminal as seen below. Thus it coves say from zero degrees to 180 degrees from full left to full right passing through the center.

Servo motor theory

 Its technical name is CCPM (Cyclic-Collective-Pitch-Mixing) or Servo Consistency Master/Servo tester. It also can be used as a signal generator for an electric speed controller (ESC).

With it, you can test your motor system without using a transmitter and receiver

Aliexpress price


There are 3 modes to check servos or ESC: indicated by 3 LED indicators.

Manual Mode:–Turn the knob for different shaft speed, check the reaction time;

Neutral Mode: –Makes the servo shaft stay at center point ie at 90 degrees.

Automatic Mode;–Car windshield wiper like operation making the servo shaft swing to left and right ie from 0 to 180 degrees and back repeatedly.

One can connect 1 to 3 servos simultaneously.

One can also connect 1 to 3 ESC to test and compare their reaction time respectively.

One can connect 3 servos for the CCPM helicopters and select servos.

With LED indicators.


Operating Voltage : DC4.8-6V

Output current: 15mA at 5 volts

Output signal: 1.5ms±0.5ms

Item size: 44 x 30 x 23mm

Product weight: 5g

Video here below

Written by 

Advisor on electronics electrical hardware

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