Model 708
Vishay Spectrol
7
/
8
"
(22.2 mm) Single Turn Conductive Plastic
Precision Potentiometer
FEATURES
•
Virtually infinite resolution
•
Bushing mount and servo mount types available
•
Rotational life
revolutions
exceeds
20
million
shaft
RoHS
COMPLIANT
•
Co-molded track and multi-finger wiper provide low noise
signal
•
Ohmic value range: 500
Ω
to 50 kΩ
ELECTRICAL SPECIFICATIONS
PARAMETER
Total Resistance
Standard Range:
Tolerance:
Linearity (Independent)
Electrical Angle
Power Rating
Section 1:
Additional Sections:
Output Smoothness
Insulation Resistance
Dielectric Strength
Taps (Extra)
Phasing
Temperature Coefficient of Resistance
STANDARD
± 10 %
STANDARD
± 0.5 %
340° ± 5°
1.0 W at 70° ambient derated to zero at 125 °C
75 % of the rating of section 1
0.1 % maximum
1000 MΩ minimum, 500 V
DC
1000 V
RMS
, 60 Hz from Terminals to shaft
Extra taps available as special
Points at which output is 0.5 aligned
± 1° (ref. to section 1)
± 400 ppm/°C maximum
500
Ω
to 50 kΩ
SPECIAL
±5%
SPECIAL
± 0.2 %
ORDERING INFORMATION/DESCRIPTION
The Model 708 can be ordered from this data sheet with a variety of alternate characteristics, as shown. For most rapid service on your
order, please state:
708
MODEL
B
MOUNTING
B:
Bushing
S:
Servo
1
NUMBER OF SECTIONS
Up to 6
10K
TOTAL RESISTANCE OF EACH SECTION
Beginning with the section nearest the
mounting end
BO1
PACKAGING
Box of 1 piece
Other characteristics will be standard as described on this data sheet. 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
MODEL
S
STYLE
B:
Bushing
S:
Servo
2
GANGS
From 1 up to 6
102
OHMIC VALUE GANG N
O
1
1K
103
OHMIC VALUE GANG N
O
2
10K
B01
PACKAGING
Document Number: 57070
Revision: 02-Jul-07
For technical questions, contact: sfer@vishay.com
www.vishay.com
41
Model 708
Vishay Spectrol
7
/
8
"
(22.2 mm) Single Turn Conductive Plastic
Precision Potentiometer
BUSHING MOUNT: 708 B
DIMENSIONS
in inches (millimeters)
± 0.010
1
0.308 MIN.
(7.82) TYP.
0.062
(1.57)
0.687
(17.45)
0.500
(12.70)
± 0.031
3
30°
TYP.
1
2
0.250
± 0.015
(6.35)
3
/
8
- 32 UNEF -2A
+ 0.0000
- 0.0010
± 0.015
Ø 0.4062
(10.32)
Ø 0.875
(22.22)
0.640 R MAX.
(16.26)
+ 0.0000
MTG. FACE
Ø 0.1248
- 0.0003
(3.17)
SERVO MOUNT: 708 S
± 0.010
± 0.031
1
0.687
(17.45)
0.062
(1.57)
0.062
(1.57)
0.062
(1.57)
0.500
(12.70)
± 0.015
Ø 0.875
(22.22)
2
1
Ø 0.750
MAX.
(19.05)
+ 0.0000
Ø 0.7500
- 0.0005
(19.05)
Ø 0.875
(22.22)
CW
3
+ 0.0000
SCHEMATIC
MTG. FACE
1
Ø 0.1248
- 0.0003
(3.17)
TOLERANCES: UNLESS OTHERWISE NOTED.
DECIMALS ± 0.005 ANGLES ± 2°
ADD 0.500 ± 0.002 (12.70) FOR EACH
ADDITIONAL SECTION
MECHANICAL SPECIFICATIONS
PARAMETER
Rotation
Bearing Type
Servo Mount:
Bushing Mount:
Torque (Maximum)
Servo, 1 Section
Bushing, 1 Section
Each Additional Section
Runouts (Maximum)
Shaft Runout (TIR/in)
Pilot Dia. Runout (TIR)
Lateral Runout (TIR)
Shaft End Play
Shaft Radial Play
Weight (Maximum)
Single Section:
Each Additional Section:
Ganging
Moment of Inertia
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)
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)
0.6 oz. (17.0 g)
0.2 oz. (5.67 g)
6 sections max, terminal alignment, added sections within ± 10° of section 1 terminals
0.12 g - cm
2
per section maximum
360° continuous
Ball bearing
Sleeve bearing
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)
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)
www.vishay.com
42
For technical questions, contact: sfer@vishay.com
Document Number: 57070
Revision: 02-Jul-07
Model 708
7
/ "
8
(22.2 mm) Single Turn Conductive Plastic
Precision Potentiometer
Vishay Spectrol
MATERIAL SPECIFICATIONS
Housing and Lids
Shaft
Terminals
Bushing Mount Hardware
Lockwasher Internal tooth:
Panel Nut:
Aluminum, anodized
Stainless steel, non-magnetic
non-passivated
Brass plated for solderability
Steel, nickel plated
Brass, nickel plated
ENVIRONMENTAL SPECIFICATIONS
Vibration
Shock
Salt Spray
Rotational Life
Load Life
Temperature Range
15 g thru 2000 Hz
50 g
96 h
Servo: 20 million shaft revolutions
Bushing: 5 million shaft revolutions
900 h
- 55 °C to + 125 °C
MARKING
Unit
Identification
Units shall be marked with Spectrol name, model no, and data code, and on each section, resistance,
resistance tolerance, linearity and terminal identification
POWER RATING CHART
(Ratings for cup No. 1.
Additional cups 75 % of values shown)
RESISTANCE ELEMENT DATA
RESISTANCE
VALUES
(Ω)
500
MAXIMUM VOLTAGE
APPLICABLE
(V)
22
32
45
71
100
141
224
RATED POWER IN W
2.0
1.5
1K
2K
5K
1.0
10K
0.5
0
20
40
60
80
100
120
140
160
20K
50K
AMBIENT TEMPERATURE IN °C
Document Number: 57070
Revision: 02-Jul-07
For technical questions, contact: sfer@vishay.com
www.vishay.com
43
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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1
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