Model 708
www.vishay.com
Vishay Spectrol
Revision: 27-Mar-15
1
Document Number: 57070
For technical questions, contact: sferprecisionpot@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
7
/
8
" (22.2 mm) Single Turn Conductive Plastic
Precision Potentiometer
FEATURES
• Virtually infinite resolution
• Bushing mount and servo mount types
available
• Rotational life exceeds 20 million shaft revolutions
• Co-molded track and multi-finger wiper provide low noise
signal
• Ohmic value range: 500 to 50 k
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
QUICK REFERENCE DATA
Sensor type ROTATIONAL, conductive plastic
Output type Output by turrets
Market appliance Professional
Dimensions
7
/
8
" (22.2 mm)
ELECTRICAL SPECIFICATIONS
PARAMETER
Total resistance standard range 500 to 50 k
Tolerance
STANDARD
± 10 %
SPECIAL
± 5 %
Linearity (independent)
STANDARD
± 0.5 %
SPECIAL
± 0.2 %
Electrical angle 340° ± 5°
Power Rating
Section 1:
Additional sections:
1.0 W at 70° ambient derated to zero at 125 °C
75 % of the rating of section 1
Output smoothness 0.1 % maximum
Insulation resistance 1000 M minimum, 500 V
DC
Dielectric strength 1000 V
RMS
, 60 Hz from terminals to shaft
Taps (extra) Extra taps available as special
Phasing
Points at which output is 0.5 aligned
± 1° (ref. to section 1)
Temperature coefficient of resistance ± 600 ppm/°C maximum
ORDERING INFORMATION/DESCRIPTION
The Model 708 can be ordered from this datasheet with a variety of alternate characteristics, as shown. For most rapid service on your order,
please state:
708 B 1 10K BO1
MODEL MOUNTING NUMBER OF SECTIONS TOTAL RESISTANCE OF EACH SECTION PACKAGING
B: Bushing
S: Servo
Up to 6
Beginning with the section nearest the
mounting end
Box of 1 piece
Other characteristics will be standard as described on this datasheet. If special characteristics are required, such as: special linearity
tolerance, special resistance tolerance, extra taps, non-linear functions, etc., please state these on your order and allow additional lead time
for delivery.
SAP PART NUMBERING GUIDELINES
708 S 2 102 103 B01
MODEL STYLE GANGS
OHMIC VALUE
GANG N
o
1
OHMIC VALUE
GANG N
o
2
PACKAGING
B: Bushing
S: Servo
From 1 up to 6 1K 10K
Model 708
www.vishay.com
Vishay Spectrol
Revision: 27-Mar-15
2
Document Number: 57070
For technical questions, contact: sferprecisionpot@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
DIMENSIONS in inches (millimeters)
MECHANICAL SPECIFICATIONS
PARAMETER
Rotation 360° continuous
Bearing type
Servo mount:
Bushing mount:
Ball bearing
Sleeve bearing
Torque (maximum)
Servo, 1 section
Bushing, 1 section
Each additional section
STARTING
0.10 oz. - in (7.20 g - cm)
0.25 oz. - in (18.00 g - cm)
0.10 oz. - in (7.20 g - cm)
RUNNING
0.085 oz. - in (6.12 g - cm)
0.20 oz. - in (14.40 g - cm)
0.075 oz. - in (5.40 g - cm)
Runouts (maximum)
Shaft runout (TIR/in)
Pilot dia. runout (TIR)
Lateral runout (TIR)
Shaft end play
Shaft radial play
SERVO
0.002" (0.05 cm)
0.002" (0.05 cm)
0.002" (0.05 cm)
0.005" (0.13 cm)
0.002" (0.05 cm)
BUSHING
0.002" (0.05 cm)
0.002" (0.05 cm)
0.005" (0.13 cm)
0.005" (0.13 cm)
0.004" (0.10 cm)
Weight (maximum)
Single section:
Each additional section:
0.6 oz. (17.0 g)
0.2 oz. (5.67 g)
Ganging 6 sections max, terminal alignment, added sections within ± 10° of section 1 terminals
Moment of inertia 0.12 g - cm
2
per section maximum
SERVO MOUNT: 708S/708-2
BUSHING MOUNT: 708B/708-1
0.687
(17.45)
± 0.010
0.500
(12.70)
± 0.031
0.062
(1.57)
Ø 0.875
(22.22)
Ø 0.7500
(19.05)
+ 0.0000
- 0.0005
Ø 0.1248
(3.17)
+ 0.0000
- 0.0003
MTG. FACE
Ø 0.875
(22.22)
± 0.015
Ø 0.750
MAX.
(19.05)
0.062
(1.57)
0.687
(17.45)
± 0.031
0.500
(12.70)
± 0.010
0.250
(6.35)
± 0.015
3
/
8
- 32 UNEF -2A
Ø 0.875
(22.22)
Ø 0.4062
(10.32)
± 0.015
+ 0.0000
- 0.0010
Ø 0.1248
(3.17)
+ 0.0000
- 0.0003
MTG. FACE
0.062
(1.57)
0.308 MIN.
(7.82) TYP.
3
1
2
30°
TYP.
0.640 R MAX.
(16.26)
1
ADD 0.500 ± 0.002 (12.70) FOR EACH
ADDITIONAL SECTION
TOLERANCES: UNLESS OTHERWISE NOTED.
DECIMALS ± 0.005 ANGLES ± 2°
CW
SCHEMATIC
2
3
1
0.062
(1.57)
1
1