Marsh Bellofram DigiTec Division 758-JB2 Series Screw Mounting Tachometers
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Catalog excerpts

758-JB2 Series Digitec Division atcdigitec.com 800.727.5646 336 Tachometers/Generators // 758-JB2 Series The 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearingless AC generators on page 339. Dust-proof aluminum alloy housing. S.A.E. 7/8" screw-type steel mounting with 3/16" solid drive dog. Used on Diesel and gas engines where a standard S.A.E. screw-type tachometer outlet is available. Two binding posts for electrical connection. Approximate torque: 2.0 oz.-in. starting, 2.0 oz.-in. running (1000 RPM). S c r e w M o u n t i ng T a c h ome t e r s BINDING POST COVER BOX \\\SPECIFICATIONS VOLTAGE OUTPUT AT 1000 RPM 10 Volts AC ±1% Per 1000 RPM Open Circuit ACCURACY ±1% EMF LINEARITY 1 Dependent Upon Load and Speed PERMISSIBLE CURRENT DRAIN 150 mA FREQUENCY AT 900 RPM 60 Hz Sine Wave ALLOWABLE END PLAY 0.005" MAX OPERATING TEMPERATURE 250°F INTERNAL RESISTANCE AT 25°C Standard Unit 100 ½ ±1% F. Type Unit* 32 ½ ±20% INSULATION Insulation Class 105 ROTOR Alnico V, 8 Poles STATOR 8 Poles BEARINGS Ball TEMPERATURE COEFFICIENT Standard Unit 0.2% Per 10°C Change F. Type Unit* Not Compensated, 0.4% Per 10°C Change MIN. SPEED 500 RPM MAX. TOP SPEED 5000 RPM STARTING TORQUE 2.0-3.0 oz. ins. RUNNING TORQUE AT 1000 RPM 2.3 oz. ins. SHAFT DIAMETER 3/16" SHAFT CONNECTION Direct SHAFT LENGTH 0.47" ELECTRICAL CONNECTION JB2 10-32 Studs JB5 AN Plug Connection MOUNTING SAE 7/8" Screw ENCLOSURE Dust Resistant MEASUREMENTS JB2 4.22"L x 2.82"H x 2.82"W JB5 4.59"L x 3.38"H x 2.82"W WEIGHT JB2 2.9 Ibs. Approximate JB5 2.6 Ibs. Approximate *F-Type generators for use in frequency responsive systems only. any of the above types can be supplied for use in frequency systems \\\DIMENSIONS (INCHES/MILLIMETERS) \\\ORDERING INFORMATION MODEL NUMBER DESCRIPTION 758-9905000 758 Type JB2 Tachometer for Voltage-Responsive Systems 0133477-902 758 Type JBF2 Tachometer for Frequency-Responsive Systems 758-9905001 758 Type JB5 Tachometer for Voltage-Responsive Systems 0134030-901 758 Type JBF5 Tachometer for Frequency-Responsive Systems ACCESSORIES AN3106-12S-3S Mating Socket Connector Type JB5—Same as Type JB2, but binding posts are replaced by a cover box and an AND 10066-12S-3P connector. Mating socket connector is AN3106-12S-3S (not supplied).

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