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DIGITAL

OHMMETER

TYPE DO4A

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Summary of Contents for DO4A

Page 1: ...DIGITAL OHMMETER TYPE DO4A...

Page 2: ...rinciple 5 4 Case Design 5 5 Maintenance 5 6 Battery Charging 6 7 Technical Data 7 8 Description of Controls 8 8 1 Auto Zero 8 9 Methods of Measurement 9 9 1 Ohmmeter Connections 9 10 Power up 12 11 M...

Page 3: ...ass I as defined in the EN61010 This apparatus has been designed and tested in accordance with EN61010 Safety Requirements for Electronic Measuring Apparatus and has been supplied in a safe condition...

Page 4: ...specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders are prohibited Whenever it is likely that the protection has been impaired the apparatus sha...

Page 5: ...xt The case is painted anthracite grey and the tilt handle means that the instrument can be positioned for easy viewing 5 Maintenance Normally no maintenance is required other than cleaning with a moi...

Page 6: ...the inlet socket and the correct fuse inserted The LINE LED will illuminate on the front panel to indicate when the mains supply is connected Charging is automatically controlled with built in protect...

Page 7: ...Resistance True four terminal measurement with fixed dc measuring currents Measuring time Approx 0 5 seconds Auto zero Permits the automatic zero of amplifiers eliminating errors due to thermal emf Ra...

Page 8: ...Press the auto zero the LED will illuminate and the zero offset will be measured and stored as an offset Reconnect the current leads in the normal measurement configuration and the resistance reading...

Page 9: ...plied with four leads two for the potential connections which are made across the test resistor at the points between which the resistance is to be determined and two for the current connections which...

Page 10: ...DO4A Issue 3 2001 10 Fig 8 2 Combined current and potential probes...

Page 11: ...ue 3 2001 11 Fig 8 3 Various types of resistors C1 P1 C P C1 C P1 P Connections to Current Shunt Connection to Cable Joint C1 P1 P C Measurement with duplex handspikes C1 C P1 P Connections to Stud Te...

Page 12: ...suring terminals in accordance with the diagram on the instrument panel Select the range required The green LED lamp will light to indicate which buttons are active CAUTION Do not auto zero when Rx is...

Page 13: ...through the 6 Amp protective fuse which will interrupt the circuit The fuse fitted will interrupt up to 40 000 Amps The P terminals are not fused and will withstand up to 460 Volts without damage to t...

Page 14: ...be switched on but the mains power supply MUST BE DISCONNECTED before removing the top cover After resetting the instrument the full calibration procedure must be fully implemented to return the inst...

Page 15: ...ed terminated with banana plugs Jaw opening 6mm Suitable for fine wires 14 2 WIRE CLAMPS For the precise measurement of 1 meter cable samples we offer 2 wire clamp options Ordering Code Description C0...

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