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A-740

Part # A-740
Description
Category MODULE
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

RC-700
DC Tachometer Generators
SERVO-TEK
®
SERVO-TEK PRODUCTS COMPANY, INC.
www.servotek.com
rev. 2
Technical Data
An Industry Standard for over fty years.
A Servo-Tek DC tachometer generator provides a
convenient and economical means of converting
rotational speed into an isolated analog voltage
signal suitable for remote indication and control.
While this catalog contains information on our
most popular models, we also manufacture
countless special tach generators.
Construction
Most of our DC tach generators are housed in
aluminum casings protected in accordance with
Mil-C-5541 or Mil-A-8625 or high performance
plastics. Alnico permanent magnets are used.
Armature shafts are stainless-steel, and rotate
on fully shielded stainless-steel ball bearings.
Commutators are manufactured from an alloy
containing at least 90% silver. Armature
laminations are wound with Isomid insulated wire,
over Teon slot insulation. The entire armature
is then baked, resulting in a NEMA Class H
insulation system.
Linearity
Linearity at any speed is better than 0.1% of the
output at that RPM.
Bidirectional Operation
All Servo-Tek tachometer generators operate in
either rotational direction. That direction can be
determined by output voltage polarity. Output (in
either direction) is held to a tolerance of 0.25% of
the average output.
Stability
Optimum brush and commutator combination
gives 0.1% stability. Highly stable output gives no
evidence of long-term drift.
Breakdown Voltage
Servo-Tek DC tachometer generators are factory
tested with an AC potential of 1250 volts RMS
applied for one second between (either) terminal
and shaft. E-Series units are tested with 500 volts.
Temperature Range
Most of our DC tachometer generators
are designed for continuous operation
in ambient temperatures ranging from
-55ºC to +100ºC. Voltage output at 25ºC will not
deviate by more than 0.01% per degree of change
within the range of -20ºC to +75ºC. All units are
temperature compensated, with the exception of
D-Series and E-Series tach generators.
1086 Gofe Road • Hawthorne, NJ 07506 • sales@servotek.com
Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com
SERVO-TEK
®
Ripple
The ripple RMS value will not exceed 3% of the
DC value at any speed in excess of 40 RPM on
standard units. On the low ripple units, the ripple
RMS value will not exceed 1.5% of the DC value.
A peak to peak ripple of 1.5% is available on some
models.
SB-740A-2
DA-7533A-2
Model Number Mounting
Weight
(Approx.)
Inertia
(Approx.)
oz-in-sec
2
V/1000
RPM
RPM
(max)
Armature
Resistance
(dynamic)
Armature
Inductance
(henrys)
Outline
Dimensions
Mounting
Dimensions
Shaft
Size
(in.)
SA-740A-7 Face 3.0 oz 1.32 x 10
-4
2.6v 12,000 40Ω 0.024h Fig. 10 Fig. 1 .120
SB-740A-7 Flange 3.0 oz 1.32 x 10
-4
2.6v 12,000 40Ω 0.024h Fig. 10 Fig. 2 .120
SA-740A-2 Face 3.0 oz 1.32 x 10
-4
7.0v 12,000 350Ω 0.18h Fig. 10 Fig. 1 .120
SB-740A-2 Flange 3.0 oz 1.32 x 10
-4
7.0v 12,000 350Ω 0.18h Fig. 10 Fig. 2 .120
SA-757A-2 Face 3.0 oz 1.32 x 10
-4
7.0v 12,000 350Ω 0.18h Fig. 11 Fig. 1 .187
SB-757A-2 Flange 3.0 oz 1.32 x 10
-4
7.0v 12,000 350Ω 0.18h Fig. 11 Fig. 2 .187
SA-740B-1 Face 4.0 oz 2.27 x 10
-4
20.8v 8,000 1000Ω 0.56h Fig. 10 Fig. 1 .120
SB-740B-1 Flange 4.0 oz 2.27 x 10
-4
20.8v 8,000 1000Ω 0.56h Fig. 10 Fig. 2 .120
SA-757B-1 Face 4.0 oz 2.27 x 10
-4
20.8v 8,000 1000Ω 0.56h Fig. 11 Fig. 1 .187
SB-757B-1 Flange 4.0 oz 2.27 x 10
-4
20.8v 8,000 1000Ω 0.56h Fig. 11 Fig. 2 .187
1086 Gofe Road • Hawthorne, NJ 07506 • sales@servotek.com
Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com
SERVO-TEK
®
1086 Gofe Road • Hawthorne, NJ 07506 • sales@servotek.com
Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com
SERVO-TEK
®
1086 Gofe Road • Hawthorne, NJ 07506 • sales@servotek.com
Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com
SERVO-TEK
®
1086 Gofe Road • Hawthorne, NJ 07506 • sales@servotek.com
Phone (973) 427-3100 • Fax (973) 427-4249 • www.servotek.com
SERVO-TEK
®
A-Series Tachometer Generators
Instrument Type:
• 0.120 inch shaft diameter
• Small in size
• Ideally suited to instrumentation applications
Industrial Type:
• 0.187 inch shaft diameter
• Special front-end bearings for radial loads
• Ideal for pulley and belt drive applications
A-Series
1 to 10 volts/1000 RPM
B-Series
11 to 24 volts/1000 RPM
A-Series and B-Series Specications
Maximum Driving Torque for A-Series and B-Series is 0.25 oz-in
Most units listed above are normally in stock
SA-757A-2 and SA-740A-2 SN-763A-2
SB-757B-1 and SU-7346B-1
B-Series Tachometer Generators
As is the case with the A-Series DC tachometer
generator, the B-Series also comes in instrument
and industrial congurations. Depending on the
unit, the output voltage ranges between 11 and 24
V/1000 RPM. Electrical characteristics, ripple,
linearity and temperature effects are the same as
the A-Series.
Other shaft sizes and mounting congurations are
available for most Servo-Tek generators.
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