Rotary Encoder
MES-9 Series, External diameter φ13mm, Incremental



  • Small, optical rotary encoder
  • Outside dimensions φ13 x 20
  • High resolution, 32 to 1024 pulses/revolution
  • Incremental
  • A, B, and Z output phases, square wave


Ordering Codes



Item Rating
Supply voltage 5 VDC ±10%
Consumption current 40 mA or less (under no load)
Detection system Incremental
Resolution (pulses/revolution) 32, 100, 200, 256, 300, 360, 500,  900, 1000, 1024
Output phases Phases A, B, and Z (Z=”H”)
Output phase difference A,B phase difference 90°
±45° (T/4 ±T/8)
Z phase T ±T/2 (see Output Waveform)
Output form Square wave
Output capacity Sink current: 20 mA
Residual voltage: 0.5V or less (at 10 mA)
Maximum response frequency 100 kHz
Waveform rise/fall time 2 μs or less (output cable 140 mm or less)
Starting torque 1×10-3N・m(10 gf・cm) or less
Allowable load of shaft (electrical) Radial 1.9 N (200 gf) 0.98 N (100 gf)
Thrust 1.9 N (200 gf) 0.98 N (100 gf)
Maximum allowable number of revolutions (mechanical) 6000 r/min
Operating ambient temperature/humidity 0℃ to 60℃
RH 35% to 90% no dewing
Storage ambient temperature -20℃ to 80℃
Vibration resistance Durability 55 Hz, double amplitude 1.5mm
2 hours each in X, Y, and Z directions
Impact resistance Durability 500 m/s2 (about 50G)
3 times each in X, Y, and Z directions
Cable Vinyl wire (AWG30)
Cable length 140 mm
Mass 10 g


Outside dimensions



Output circuit diagram



Output waveform