Control device of a position measuring system

A scanning head of a position measuring system, comprising:

• a control unit, said control unit comprising:
• a detector that determines an amplitude level of a scanning signal of a position measuring system and generates an amplitude signal as a function of said amplitude level;
• a deviation determination unit that generates a deviation signal by comparing said amplitude signal with a predetermined nominal signal;
• an indicator that provides an indication of proper set-up of a scanning head of said scanning head of said position measuring system as a function of said deviation signal;
• and
• an evaluation arrangement for differently weighting said deviation signal in such a way that with a weak deviation signal, a change in said deviation signal causes a small, or no variation of said indication, and in contrast thereto a larger variation of said indication is caused by a stronger deviation signal.

A position measuring system, comprising:

• a scale;
• a scanning head that scans said scale, wherein said scanning head comprises:
• a control device comprising:
• a detector that determines an amplitude level of a scanning signal of a position measuring system and generates an amplitude signal as a function of said amplitude level;
• a deviation determination unit that generates a deviation signal by comparing said amplitude signal with a predetermined nominal signal;
• an indicator that provides an indication of a proper set-up of said scanning head as a function of said deviation signal;
• and
• an evaluation arrangement for differently weighting said deviation signal in such a way that with a weak deviation signal, a change in said deviation signal causes a small, or no variation of said indication, and in contrast thereto a larger variation of said indication is caused by a stronger deviation signal.

A method for generating an indication regarding the amplitude level of at least one scanning signal of a position measuring system, the method comprising:

• determining an amplitude level of at least one scanning signal of a position measuring system;
• generating an amplitude signal based on said determined amplitude level;
• forming a deviation signal by comparing said generated amplitude signal with a predetermined nominal signal;
• providing an indication of a proper set-up of a scanning head of said position measuring system as a function of said deviation signal, wherein with a weak deviation signal, a change in said deviation signal causes a small, or no variation of said indication, and in contrast thereto a larger variation of said indication is caused by a stronger deviation signal.