Optical Head
Supply volatge [V]
Temp. range [°C]
-40 to +125
US Digital
Product description

The EM1 is a transmissive optical encoder module designed to be an improved replacement for the HEDS-9000 series encoder module. This module is designed to detect rotary or linear position when used together with a encoder disk or linear strip. The EM1 consists of a lensed LED source and a monolithic detector IC enclosed in a small polymer package. The EM1 uses phased array detector technology to provide superior performance and greater tolerances over traditional aperture mask type encoders. The EM1 provides digital A & B quadrature outputs with an optional third output index channel. Each EM1 module is resolution specific and is matched to the resolution of a encoder disk or linear strip. All standard resolutions offered by the HEDS-9000 series encoder module, as well as additional resolutions, are now supported by the EM1 module. The EM1 operates with a single 5V supply and provides single ended outputs which are capable of both sinking and sourcing 8mA. An internal 0.1 uF decoupling capacitor is designed into the EM1 to provide enhanced noise immunity over the HEDS-9000 series encoder modules. For open collector and higher voltage applications, add the PC3 cable driver, or for differential cable driver outputs, add the PC4 cable driver. Encoder disks, linear strips, quadrature decoder chips, counter chips, computer interface boards, mating connectors and cables are also available.

Now with 4 times the resolution: 2000 to 5000 cycles per revolution

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