• Self Aligning
  
• Self Gapping
  
• Resolution 20 - 1250 pulses per revolution
  
• Frequency response to 200 KH
  
• Positive lock on cover
  Wide Selection of Hub Bore sizes and terminations
  12 Month Warranty

The 21SG series Modular is highly reliable, low cost encoder using the latest SMT technology.

Installation and set-up is dramatically simplified with the gap/cam mechanism. The modular is aligned and gapped with the clockwise 90∞ turn of the cam. No further adjustments are required.

The positive snap on cover feature is convenient and eliminates hardware.

• Code— Incremental
• Resolution—20-1250 cycles per revolution
• Supply Voltage—Vs (±5% ) + 5 or +12
• Supply Current—140 MA max
• Light Source—LED
• Output Format
  • Two count channels electrically phased 90° ± 25°
  • One (optional) Zero Reference signal see fig#2
    
• Output Signal
  • Vhigh=Vs thru 4.7K pull-up
  • Vlo = .5 volts max
  • Rise/fall time 1.0 µsec max
• Symmetry (duty cycle)—180° ± 10°
• Frequency Response—0 -200 KHz
• Output Device
  • TTL 7404
  • TTL 7406 Open Collector
  • CMOS — MC4069
  • Line Driver SN 75183D or 26LS 31CM

• Dimensions— See outline drawing fig#2
• Weight—2 oz. max
• Moment of Inertia—1 x 10-4 oz.-in. sec2
• Hub Bore Size

  Nominal 1/4", 3/8", 1/2", 5/8" are standard, special sizes and mm diameters are available

• Operating Temp.

  0° to 70°C (32° to 158°F)

  -25° to 85C (-13° to 190°)F

• Slew Speed —10,000 rpm
• Accuracy — ±.2 min of ARC
• Materials— Lexan - Glass Fill
• Code Disc Material— Acrylic , Glass, Metal