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Electron

S.R.L.

Design Production & Trading of Educational Equipment

A47 - INSTRUMENTS FOR ELECTRICAL MACHINES

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4720 - DIGITAL RPM METER

General: The A4720 is a bench type instrument housed in a rugged metallic enclosure of approximately 350 (W) x 120 (H) x 220 (D) mm. The instrument matches in its design philosophy and appearance the other ELECTRON equipment for the Electrical Machines Laboratory. The A4720 is preset at the factory to work with inputs from one of the following sources (please specify when ordering): – – –

Magnetic pickups Inductive proximity sensors Optical sensors

Technical characteristics: characteristics: – –

High visibility 4 digit display DC analog output voltage 0 to 10 V that can be used to drive additional meters or as input to a Data Acquisition System On-board speed relay, knobadjustable in the range of 1,000 to 5,000 rpm

Easily field-adjusted to work with input rates of 4 pulses / revolution up to 100 pulses / revolution, providing an indication of 0 to more than 4,000 rpm. AC mains voltage 220-240 V or 115127 V, 50-60 Hz (to be specified when ordering).

Ordering codes: A4720-OP – preset to work with optical sensors A4720-PR – preset to work with proximity sensors A4720-MPU – preset to work with magnetic pickups

Optionals: A4722 – Optical sensor assembly A4723 – Proximity sensor assembly A4724 – Magnetic pickup assembly All sensor types are provided with mounting accessories to facilitate installation on the Electrical Machines Test Bed Model A4840.

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4722 - OPTICAL TRANSDUCER ASSEMBLY FOR THE A4720 RPM METER

General:

Features:

This unit provides in the simplest and handiest manner a pulsed signal whose frequency is proportional to the revolution speed of an electric motor under test.

An adhesive tape with alternate white / black segments is wound on the motor shaft. The A4722 includes an emitting source of monochromatic light (red) which is pointed to the revolving strip. The detector of the A4722 provides a pulsed output signal at each change of the black-white segments.

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Fast response of the transducer allows a high number of pulses / revolutions, thus providing a precise indication. Use of monochromatic light makes the device practically insensitive to ambient light conditions. Use of light information allows easy, non-critical positioning of the sensor.

The A4722 is supplied with the cable to connect the A4720 RPM Meter and with mechanical parts (brackets, threaded stands, etc.) to facilitate mounting.

Ordering code: A4722

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4725 (DT(DT-2236) PHOTO/CONTACT DIGITAL TACHOMETER RPM Counter/Revolution Counter with Chrystal Oscillator Timer for accuracy and fast measurements. Rugged construction and an ABS anti-shock case ensure durability and continuing precision. Can be used with single hand. 5 Digits LCD Display Ample range from 0,5 to 100.000RPM RPM, meters/min, feet/min Ranges: Ranges photo tach. 5-99.999RPM Contact tach. 0,5-19.999 RPM Surface speed speed: 0,05-1.999,9 m/min 0,2-6.250 feet/min Resolution: Resolution photo and contact RPM (0,5-999,9 RPM) Surface speed 0,01 m/min 0,1 feet/min Precision: Precision ±0,05% ±1 digit Operating Temperature 0°C to 50°C Power Supply: Supply 4 x 1,5V batteries Weight: Weigh 300g Supplied with: with manual, case, reflecting tape, conic and funnel adapters, wheel for surface speed

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4726 (DT(DT-2239A) - DIGITAL STROBOSCOPE

The A4726 is a microprocessor based, high precision Digital Stroboscope/Tachometer specifically designed for inspection and measurement of the speed of moving/rotating parts of practically any equipment. Especially useful in maintenance activities, laboratories, and schools for measurement as well as demonstration purposes.

Specifications Display Flash Rate Accuracy Housing

Operating procedures Connect the instrument to the power outlet (110, 220 or 230VAC) Turn the power switch on Choose the range of operation (Low or High) Synchronize the stroboscope to the moving part (The strobe will also stop movement at the harmonic speeds, i.e. 2:1, 3:1 etc.) For slow motion effect, synchronize the strobe as explained above and then slowly turn the speed dial up or down

Accessories Resolution Power Supply Calibration

4 digits LED, 0.3" Dimensions 21 x 12 x 12 cm 100 to 10,000 / min (FPM) Weight 1 Kg 100 to 5,000 FPM/RPM, ±1digit Compact plastic case Above 5,000 FPM/RPM, ± 0.05% Operating manual Up to 10,000 FPM/RPM, 1 FPM/RPM 110, 220, 230 VAC, 50/60Hz Crystal Time Base

Flash Tube Tube Flash power Flash duration Beam angle Flash color

Xenon lamp 4 W / sec Approx. 60 to 1,000 µsec 80° Xenon white, 6,500 K°

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4730 - MOTOR TORQUE MEASURING MODULE A4731 - LOAD CELL

General: General: The A4730 is a torque measuring instrument housed in a desk-top metallic enclosure whose approximate size is 350 (W) x 120 (H) x 220 (D) mm. The instrument matches in design philosophy and appearance the other ELECTRON equipment for the Electrical Machine Laboratory. The A4730 operates by processing the input signal of the A4731 Load Cell. This consists of a strain sensing arm with force transducers in a bridge configuration. The A4731 can be easily mounted on the Electrical Machines Test Bed Model A4840 by means of the accessories provided.

The A4730 can provide torque indications in 2 ranges (preset at the factory), respectively up to 2 Nm (1.99) and 20 Nm (19.99). The ensemble A4730 + A4731 can be easily checked and calibrated by using the procedure indicated in the instruction manual. Power supply is from AC mains 220-240 V or 115-127 V, 50-60 Hz (to be specified when ordering)

Ordering codes: A4730 – Torque meter A4731 – Load Cell for Braking Generator and Eddy Current Brake up to 20Nm

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4750A4750-A – ANALOG ELECTRICAL POWER MEASURING SET This set provides all DC and AC measures required for the Electricity laboratory and for any electrical machines bench composition. All meters are of analogue type, with portable permanent magnet moving coil instrument suitable for d.c. current or voltage measurements. Moreover by means of selfcontained rectifier a.c. measurements are possible. Moving iron meters are supplied on request. CONSTRUCTION Core magnet and moving coil mounted with pivot vanadium steel and in spring loaded jewels. All units are in metal housing, with 4 mm. terminals unlooseable and according to IEC standards for safety, to avoid any accidental contact. All instruments are Type SLD-E from SAMAR (Italy). SCALE The scale arc is 50 mm with fine divisions on white enamelled metallic dial. The scale shape is linear. The Wattmeter are 96 x 96 instruments, with wattmetric converter. Panel dimensions are 210 x 300 x 75 mm. TECHNICAL FEATURES Well compensated, the accuracy class is guaranteed for a change of +/- 10°C in the ambient temperature of 20°C. Rated accuracy : +/- 1,5% d.c. / + 2% a.c. All units can be used both as bench instrument as well as in the panel holder (model A48.96 supplied optionally), suitable to hold up to 8 instruments. Connecting cables (like those included in A48.90) are supplied optionally.

Proposed Ranges: (other ranges can be made on request). A4750A-V Voltmeters 50/500V A4750A- A Ammeters 1/10A or according to the machines power A4750A-W Wattmeters: 1/5A; 50/500V A4750A-C Cosfimeter: 0,2 - 1 - 0,8 A4750A-F Frequencymeter: 45-55 Hz (or 55-65 if 60 Hz mains) Standard Composition of A4750A 4 Ammeters 3 Voltmeters 2 Wattmeters Optional units: 1 Cosfimeter 1 Frequencymeter

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Rev 08/00 Specifications may change without notice

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A4750D - DIGITAL ELECTRICAL POWER MEASURING SET The Digital Electrical Power Measuring Set contains three instruments that make it suitable for most laboratory and education requirements. The instruments are: DC Ammeter for up to 10A DC Voltmeter for up to 800V Three Phase Power Analyzer for measuring several electrical parameters as explained below Digital Three Phase Energy Analyzer Type MV3DL This Digital Power Analyzer measures various electrical parameters of three phase systems, with or without neutral, and displays the readings separately for each phase or cumulatively. Connection information is detailed in the manual provided with each instrument.

Power Supply Power requirement is max 5VA at 115/220V (+15 -20%), 50/60Hz Display Readings: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.

V1, V2, V3 V1-2, V2-3, V1-3 I1, I2, I3 PF1, PF2, PF3 VA1, VA2, VA3 W1, W2, W3 VAr1, VAr2, VAr3 V, I, PF VA, W, Var Hz VarH, Wh 15 minutes average power (VAr, W)

The parameters are always computed, even when they are not displayed.

SetSet-Up The instrument parameters are set at the factory to default values. If so desired, they can be changed by means of front panel pushbuttons as explained in the instrument manual provided with it. Serial line connection (optional) On request, the instrument can be equipped with the connection to a serial line RS485. Voltage Voltage Inputs Nominal input voltage is 440V (max. phaseto-phase is 600V); for higher voltages use appropriate transformers and respect their input and output phase sequence. Current Inputs Maximum current direct current transformer) is 5A.

input

(without

ELECTRON S.R.L. VIA CASCINA TORCHIO I-26833 MERLINO (LO) ITALY - TEL. 39(Italy) 02(Milan) 9065 9200 Rev 03/01 FAX 9065 9180 - E-mail: electron@electron.it Web: www.electron.it Specifications may change without notice

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