Encoders: Output= ~1Vpp or 1Vss Sinusoidal signals

Incremental signals ~1 VPP sinusoidal signals HEIDENHAIN encoders with ~1 VPP  interface provide voltage signals that can  be highly interpolated.

 The sinusoidal incremental signals A and B are phase-shifted by 90° elec. and have amplitudes of typically 1 VPP. The illustrated  sequence of output signals—with B lagging A—applies for the direction of motion shown in the dimension drawing.The reference mark signal R has a usable component G of approx. 0.5 V. Next to the reference mark, the output signal can be reduced by up to 1.7 V to a quiescent value H. This must not cause the subsequentelectronics to overdrive. In the lowered signal level, too, signal peaks can appear with the amplitude G.

 The data on signal amplitude apply when the supply voltage given in the specifications is connected to the encoder.It refers to a differential measurement at the 120 ohm terminating resistor between the associated outputs. The signal amplitude decreases with increasing frequency. The cutoff frequency indicates the scanning frequency up to which a certain percentage of the original signal amplitude is maintained: • –3 dB = 70 % of the signal amplitude  • –6 dB = 50 % of the signal amplitude

 The data in the signal description apply to motions at up to 20 % of the –3 dB-cutoff frequency.

 Interpolation/resolution/measuring step The output signals of the 1 VPP interface are usually interpolated in the subsequent electronics in order to attain sufficiently high resolutions. For velocity control, interpolation factors are commonly over 1000 in order to receive usable information even at low rotational or linear velocities.

 Measuring steps for position measurement are recommended in the specifications. For special applications, other resolutions are also possible.

 Short-circuit stability : A short circuit of outputs is not a permissible operating condition. Exception: For encoders with a 5 V DC ± 5 % supply voltage, a temporary short circuit of one signal output to 0 V or UP does not cause  encoder failure.