US Digital

Parameter	Max.	Units
Vibration (5 to 2kHz)	20	g
Shaft Axial Play	0.01	in.
Shaft Eccentricity Plus Radial Play	0.004	in.
Acceleration	250,000	rad/sec²
Maximum RPM e.x. CPR = 1250, max. rpm = 4800 e.x. CPR = 512, max. rpm = 11718 e.x. CPR = 50, max. rpm = 60000 e.e. CPR = 32, max. rpm = 60000	minimum value of (6000000 / CPR) and (60000)	rpm

• Note that radial play translates directly to position inaccuracy.
• Note: 60000 rpm is the maximum rpm due to mechanical considerations. The maximum rpm due to the module's 100kHz maximum count frequency is (6000000/CPR).

B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation viewed from the cover/label side of the encoder.

Parameter	Torque
Hub Set Screw to Shaft	2-3 in.-lbs.
Cover (4-40 screws through cover into base)	2-3 in.-lbs.
Base to Mounting Surface	4-6 in.-lbs.
Base to Mounting Adapter Plate	4-6 in.-lbs.
Adapter Plate to Mounting Surface (4-40 screws)	4-6 in.-lbs.

Be sure to keep different diameters, resolutions and options separated. The resolution of the optoelectronic modules and the code wheels must match. Index and non-index parts cannot be mixed since the optical patterns are different. An identifier is stamped on each optoelectronic module.

For Agilent Modules (HEDS):
The 2-channel (non-index) version can be identified by a 9100 or 9200. The 3-channel (index) version can be identified by a 9140. One letter specifies the resolution as shown in the table below.

For US Digital Modules (EM1):
Only available in 3-channel (index) version and are identified by a 1 for 1" disk. The second number indentifies the resolution as shown in the table below (in italics).

Disk	Standard	Index
32	-	1-32
50	S	S
96	C	C
100	C	C
110	C	-
120	C	-
192	E	E
200	E	E
250	F	F
256	F	F
360	G	G
400	H	H
500	A	A
512	I	I
540	I	-
720	-	1-720
900	-	1-900
1000	B	1-1000
1016	J	-
1024	J	1-1024
1250	-	1-1250

Pin	Description
1	Ground
2	Index
3	A channel
4	+5VDC power
5	B channel

Index

Provides a single pulse per revolution.

3-option

 

3-option makes all five of these hole diameters .125". If desired, the two .096" diameter recesses will mate with matching aligning pins. The .438" diameter center hole can also mate with a motor boss.

A-option

 

A-option adds a .497" diameter alignment shoulder designed to slip into a .500" diameter recess in the mounting surface centered around the shaft.

E-option

 

The E-option provides a cylindrical extension to the cover allowing for longer shafts of up to .795".

G-option

 

This option includes molded ears on the base which enable it to be mounted to a 1.812" diameter bolt circle. The mounting holes are designed to fit 4-40 screws. Because the ears are molded to the base this does not increase the thickness of the encoder and does not add to the required shaft length. This option will work with shaft lengths of .445" to .570".

H-option

The H-option adds a hole to the cover for the shaft to pass through.

Shafts <.375", a .375" diameter hole is supplied.

Shafts >=.375", a .500" diameter hole is supplied.

R-option

 

This adapter is an 1/8" thick fiberglass adapter which is pre-mounted to the base of the encoder. It allows the E2 to be rotated 15° while operating for index orientation. Use three 4-40 x 1/4" screws (sold separately). When installing the hub, rotate the index to the approximate position. After assembly, with the 3 screws loose, rotate while operating to the desired index location and tighten. Note that this adds 1/8" to the required shaft length.

T-option

 

When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting. Use the centering tool (sold separately) to slide the base into position. T-option specifies transfer adhesive on the standard mounting base. A centering tool is highly recommended when using transfer adhesive.

Instructions: To use transfer ahesive, peel off paper backing and slip tool into center hole of base and slide both down shaft as one piece. Press to form a good bond, then slip tool off and continue with standard mounting instructions.

For complete information on included accessories see the Packaging Options below.

Centering Tools (May need to order separately, only included with PKG3-packaging option).

• Part #: CTOOL - (Shaft Diameter)

  Description: This reusable tool provides a simple method for accurately centering the E2 base onto the shaft, promoting hub to base concentricity and thus accuracy. It is recommended for the following situations:

  • When using mounting screws smaller than 4-40.
  • When the position of the mounting holes is in question.
  • When using the 3-hole mounting pattern.
  • When using the T-option transfer adhesive.

  Instructions: When mounting encoder base, slide centering tool down shaft until it slips into centering hole of encoder base. Tighten mounting screws, then remove centering tool.

Hex Tools (May need to order separately, see below for more information).

• Part #: HEXD-050 (only included with default or PKG1-packaging options).

  Description: Hex driver, .050" flat-to-flat for 3-48 or 4-48 set screws.

• Part #: HEXW-050 (only included with PKG2 or PKG3-packaging options)

  Description: Hex wrench, .050" flat-to-flat for 3-48 or 4-48 set screws.

Spacer Tools (Do not need to order separately, included with ALL packaging options)

• Part #: SPACER-96

  Description: For shafts <=.315".

• Part #: SPACER-4192

  Description: For shaft sizes 3/8 IN. or 10MM.

Screws For base mounting only, screws for mounting the housing to the base are already included).

• Part #: SCREW-080-250-PH

  Description: Pan Head, Cross Drive 0-80 UNF x 1/4"

  Quantity Required for Mounting: 3 per encoder

• Part #: SCREW-256-250-PH

  Description: Pan Head, Cross Drive 2-56 UNC x 1/4"

  Quantity Required for Mounting: 2 per encoder

• Part #: SCREW-440-250-PH

  Description: Pan Head, Cross Drive 4-40 UNC x 1/4"

  Quantity Required for Mounting: 2 per encoder

• 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