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Home » Products » Encoders » Incremental » Rotary » Shaft

This product has been succeeded by the S5 Optical Shaft Encoder.

This next generation product is highly recommended for all new designs and applications. Learn more »

S1 Optical Shaft Encoder

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Overview

Small size
Low cost
2-channel quadrature,TTL squarewave outputs
3rd channel index option
Tracks from 0 to 100,000 cycles/sec
Ball bearing option tracks to 10,000 RPM
-40 to +100C operating temperature
Single +5VDC supply

Parameter	Sleeve Bushing	Ball Bearing
Acceleration	250,000 rad/sec²	250,000 rad/sec²
Vibration	20 g. 5 to 2KHz	20 g. 5 to 2KHz
Shaft Speed	100 RPM max. continuous	10,000 RPM max. continuous
Shaft Rotation	Continuous and reversible	-
Shaft Torque	0.5 ±0.2 in. oz. 0.3 in. oz. max. (N-option)	0.05 in. oz. max.
Shaft Loading	2 lbs. max. dynamic 20 lbs. max. static	1 lb. max.
Bearing Life	> 1,000,000 revolutions	(40/P)³ = life in millions of revs. where P = radial load in pounds
Weight	0.70 oz.	0.70 oz.
Shaft Runout	0.0015 T.I.R. max.	0.0015 T.I.R. max.

Specifications apply over entire operating temperature range.
Typical values are specified at Vcc = 5.0Vdc and 25°C.
For complete details see the EM1 and HEDS product pages.

	Supply Current	Output voltage low	Output voltage high
Resolution	Typ / Max	Max	Min	Based on
50,96, 100, 110, 120, 192, 200, 250, 256, 360, 400, 500, 512, 540 CPR, non-index	17 / 40 mA	0.4 volts @ 3.2mA	2.4 volts @ -200uA	Low-res HEDS
1000, 1016, 1024 CPR, non-index	57 / 85 mA	0.5 volts @ 8mA	2.4 volts @ -40uA	High-res HEDS
32 CPR, with index	27 / 30 mA	0.5 volts @ 8mA	2.0 volts @ -8mA	EM1
50,96, 100, 192, 200, 250, 256, 360, 400, 500, 512 CPR, with index	57 / 85 mA	0.5 volts @ 8mA	2.4 volts @ -40uA	High-res HEDS
720, 900, 1000, 1024, 1250 CPR, with index	55 / 57 mA	0.5 volts @ 8mA	2.0 volts @ -8mA	EM1

Parameter	Dimension
Shaft	Brass or stainless
Bushing	Brass
Connector	Gold plated

Parameter	Dimension
Hole Diameter	0.375" +0.005 / -0
Panel Thickness	0.125 in. max.
Panel Nut Max. Torque	20 in.-lbs.

Parameter	Dimension
Operating Temperature	-40 to +125C
Storage Temperature	-55 to +125C
ESD	2 kV minimum
Humidity Non-condensing	5 to 85%

Parameter	Dimension
1	Ground
2	Index
3	A channel
4	+5VDC power
5	B channel

Product Description

The S1 series optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs with or without index. The encoder utilizes an unbreakable mylar disk, metal shaft and bushing, LED light source, and monolithic electronics. It operates from a single +5VDC supply.

The S1 is normally designed for applications of 6 feet or less. For longer cable lengths, adding a PC4 / PC5 differential line driver is recommended.

Three shaft torque versions are available. The standard torque version has a sleeve bushing lubricated with a viscous motion control gel to provide torque and feel that is ideal for front panel human interface applications.

The no torque added option has a sleeve bushing and a low viscosity lubricant (that does not intentionally add torque) for low RPM applications where a small amount of torque is acceptable.

The ball bearing version uses miniature precision ball bearings that are suitable for high speed and ultra low torque applications.

Connection to the S1 series encoder is made through a 5-pin standard connector (sold separately). The mating connectors are available from US Digital with several cable options and lengths.

Product Notes

Cables and connectors are not included and must be ordered separately.
For ordering information please see the Compatible Cables / Connectors section above.
US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.