FRANKLIN TESTER TF-100

The measuring device Franklin tester is designed to measure the insulation resistivity of coating and its mineral components on the surface of electrotechnical steel sheet as well as applied enamel to generator stator core laminations according to the ASTM A717/ A717 M - 95 Standard.

Microprocessor controlled power supply with bi-directional servomotor and electronic regulator of adjustments rate allows setting the specific pressure forces of measuring head (which contains 10 electrodes) on the tested object. The tested object is placed on the hot plate of the measuring table, which is pressed down to the measuring head as well as warmed up according to the settled pressure and temperature values.

In the moment of switching on the measuring procedure, two mills point wise remove the coat. It is ensure the galvanic contact of the device with electrotechnical sheet. The quality of this contact as well as measuring procedure is controlled automatically. When pressure and temperature are stabilized and after 30 seconds, the value of current is measured under strictly specified applied voltage. The measured current flows between the electrodes and the sheet, which is the base of insulating coat.

The measuring table automatically comes back to the initial position after the measurement procedure is finished. It allows fixing new tested specimen and performing new measurement.

The device is fully automated including the procedure of the pressure and temperature setting, measurement, calculations and the recording of measurement results.

TECHNICAL DATA:

»   Number of electrodes 10
»   The surface of one electrode 64.5mm²
»   Total surface of electrodes 6.45cm²
»   Pressure adjustment in MPa lub psi
»   The range of pressure adjustment (2.0 ÷ 7.0)MPa
»   Accuracy of pressure adjustment ±0.5%
»   Temperature adjustment in Celsius or Fahrenheit degrees
»   The range of adjustment from ambient temperature to 200 °C or to 392 °F
»   Accuracy of temperature adjustment ±5 °C lub ±2.7 °F
»   Voltage supply of the tested object (0.500 ÷ 0.001)V
»   The range of current measurement 1.1A
»   Accuracy of current measurement ±0.001A
»   Quality control of the contact with the base of the coat (electrotechnical sheet) automatic
»   The control of measurement correctness continuous
»   The number of saved results max. 350
»   The possibility of data transmission to the external computer by series interface
»   Measurement results presentation by means of:

liquid-crystal display of the device,
monitor, after connection the device to the computer,

»   Resistivity is determined from the equation:

where: I [A] - the value of current strength under voltage supply equals 0.500V,
6.45 cm² - total surface of contact of electrodes.

Power supply:
»  Three-phase power supply 3*400V +5% -10%
»  Frequency 50 Hz
»  Power 2 kVA

The performance capabilities of the tester ensure the measuring precision acquired for the unequivocal evaluation of both insulating coat of the sheets and the quality of varnish procedure. Franklin tester is especially valuable as basic equipment for research laboratories and companies, which are engaged in technology, production and utilisation of electrotechnical steel.

TECHNICAL DATA

PDF version of TF-100
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DOC version of TF-100
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