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Summary of Contents for Cropico DO4A
- Page 1 DIGITAL OHMMETER TYPE DO4A...
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Page 2: Table Of Contents
3. Measuring Principle 4. Case Design 5. Maintenance 6. Battery Charging 7. Technical Data 8. Description of Controls 8.1 Auto Zero 9. Methods of Measurement 9.1 Ohmmeter Connections 10. Power-up 11. Measurement 12. Protection 13. Calibration Process 14. Accessories DO4A Issue 3/2001... -
Page 3: Safety
Before switching on the apparatus, make sure that it is set to the voltage of the power supply. The mains plug shall only be inserted in a socket outlet provided with protective earth contact. The protective action must not be negated by the use of an extension lead without a protective conductor. DO4A Issue 3/2001... -
Page 4: Introduction
4 digit LCD display; an overflow of the selected range is also indicated. Display range 4000 Simple push button selection of the range required ensures the DO4A may be easily used by unskilled personnel, error and status warnings are illuminated when appropriate. -
Page 5: Measuring Principle
Fuse (250V) Fuse (250V) Voltage IEC 127 UL198 G Selection 47-63Hz 5 x 20 mm. 0.25"X1.25" 100V 87-110V 630mA (T) 800mA Slo- 120V 104-132V 220V 191-242V 315mA (T) 400mA Slo- 240V 209-264V Maximum Input Power : 20VA DO4A Issue 3/2001... -
Page 6: Battery Charging
BS 88 : PART 2 6. Battery Charging The DO4A has a built-in sealed lead acid battery, which is fully charged when delivered. This type of battery has advantages over other types of rechargeable batteries; it is more tolerant to erratic charging cycles thus giving a better service life. -
Page 7: Technical Data
30 ppm Rdg + 4 ppm FS 1 mΩ 100 µΩ 10 mA ±(0.05% Rdg +0.05% FS) 30 ppm Rdg +25 ppm FS 400mΩ 10 µΩ 100 mA ±(0.05% Rdg +0.05% FS) 30 ppm Rdg +25 ppm FS 40mΩ DO4A Issue 3/2001... -
Page 8: Description Of Controls
The LED will stay lit to warn that an offset is stored. This offset and lamp will be cancelled if the range is changed or the instrument switched off. A maximum of ±100 digits can be offset. DO4A Issue 3/2001... -
Page 9: Methods Of Measurement
9. Methods of Measurement 9.1 Ohmmeter Connections The Digital Ohmmeter type DO4A employs a four-wire method of measurement, ie. it is necessary to make four connections to the resistor under test. The instrument is supplied 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 connects the test resistor to the supply circuit. - Page 10 Fig. 8.2 Combined current and potential probes DO4A Issue 3/2001...
- Page 11 Connection to Cable Joint Connections to Current Shunt Connections to Stud Terminals Measurement with duplex handspikes Fig. 8.3 Various types of resistors DO4A Issue 3/2001...
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Page 12: Power-Up
10. Power Up When the DO4A is first switched on, a lamp test is automatically performed, all display segments are illuminated followed by each LED lighting in sequence. The microprocessor checks for correct internal operation and indicates "P" if all tests pass O.K. -
Page 13: Protection
4mΩ, 40mΩ, 400mΩ, 4Ω, and 400Ω and 4kΩ. A calibration key is supplied with the instrument. The DO4A is designed to eliminate all calibration. The factory adjusted internal standards are constructed to give long term stability and minimal drift. However, for those wishing to adjust the ohmmeter, proceed as follows. -
Page 14: Accessories
2 hours before calibration. Select the 4mΩ range and connect a 4 milliohm Standard. This Standard should be within 0.01% or better of the nominal value. Press the CAL button and the DO4A will automatically measure the standard and store any calibration offsets. - Page 15 Ordering Code Description 1 metre wire clamp with hardwood base suitable for cable diameters up to 25mm 1 metre wire clamp with metal base and provision for temperature sensor suitable for wire cross section 1 to 1000mm DO4A Issue 3/2001...
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