About QR787 Optical Rotary Encoder Shaft Style

Quantum Devices, Inc. Model QR787 Optical Rotary Encoder Shaft Style is intended for applications requiring high performance, high-resolution digital feedback in a very small package.  The model QR787 provides the resolution of larger encoder packages but in a package only 20 mm (0.787″) in diameter. Outputs can be configured in either single ended, 5 volt RS-422 differential or with high voltage differential line driver. QDI’s patented sensing scheme embodies a much simplified encoder design, which ultimately results in longer service life and less downtime due to feedback device failure. The encoder housing is constructed of a conductive carbon fiber composite that provides the EMI shielding of an all-metal housing and performance of a lightweight robust assembly.

Design Features:

• Miniature Size, 20 mm (0.787″) diameter
• Resolutions up to 2048 lines per revolution direct read
• Single ended and differential outputs
• Long service life
• Conductive carbon fiber housing
• IP50 sealing
• High noise immunity
• Low supply current requirements
• RoHS construction

Note: prior to transitioning to RoHS-compliant, the product name was QD787 rather than QR787. Therefore, when cross-referencing a QD787 configuration, simply substitute the configuration prefix with QR787.