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The Difference of Inductive System Used in IP67 Digital calipers by Sylvac, Holy and Mitutoyo

A) The features and differences between The Sylvac Inductive System (S.I.S) and The Holy Inductive System(H.I.S):

1) The difference between appearance:
The different systems used in IP67 digital calipers can be distinguished by the structure and shape of the sensors.
In general, incremental sensor has only one line of pitches while
absolute sensor has two or more lines of pitches.

2) Different system has different encoding
By checking the sensor, we can see S.I.S adopts incremental encoding while H.I.S adopts absolute encoding. The difference between incremental encoding and absolute encoding is obvious, either of them has its advantages. Incremental encoding is simple and easy to achieve measurement of large displacement (tens of meters). Limited setting speed, poor in anti-interference and poor in reliability are its shortcomings. Absolute encoding is more complex and its measuring range is limited by the size of encoding. Its advantage is free of setting speed and power failure and has good anti-interference ability and high reliability.


B) The differences between the Mitutoyo Inductive System(M.I.S) and S.I.S & H.I.S:

1) The different form of the application of inductive sensors:
M.I.S adopts mutual inductance inductive sensor. Figure 1 shows its principle of operation which senses the displacement by sensing the change of the load R (the fixed sensor).

S.I.S adopts mutual inductance inductive sensor. Figure 2 shows its principle of operation which senses the displacement by changing the coupling coefficient of the coils on sliding sensor and fixed sensor. It's very similar to inductosyn. .

The two kinds of sensors above are equal to one (or two) transformer.
H.I.S adopts self-inductance inductive sensor. Figure 3 shows its principle of operation which senses the displacement by changing the inductance of the inductor. The fixed sensor is used to change the inductance of the induction coil. It's somewhat similar to the inductive probe, but there are differences.

2) M.I.S and H.I.S adopt absolute inductive sensor while S.I.S adopts incremental inductive sensor. M.I.S calculates absolute position by sensing the pitch differences of the three lines of pitches. Any pitch in the three lines of pitches is much smaller than the cycle of measurement (coding cycle). H.I.S calculates the absolute position by sensing the pitch difference of the two (or more) lines of pitches. The pitch in one line of the two lines of pitches must be equal to the cycle of measurement (coding cycle). This is the essential difference between M.I.S and H.I.S.

3) The signal processing and signal modulation of the three kinds of sensors above are not the same. Concerning the circuit and workmanship, M.I.S is the most complex, H.I.S is the second and S.I.S is the simplest. Concerning the power consumption, M.I.S adopts appropriative IC, hence its power consumption is the lowest.
The power consumption of both S.I.S and H.I.S is higher.

4) Concerning the zero setting, M.I.S adopts absolute encoding, but Its zero needs to be reset after replacement of battery, so does S.I.S. H.I.S's zero need not be reset after replacement of battery. This function is unique.



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