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Summary of Contents for Cropico DO7
- Page 1 DIGITAL MICROHMMETER TYPE DO7...
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Page 2: Table Of Contents
14. PROTECTION ........................10 15. CALIBRATION PROCESS ....................11 16. EQUIPMENT REQUIRED ....................11 17. PREPARATION ........................11 18. CALIBRATION ........................12 19. VERIFICATION........................12 20. USING DISCRETE RESISTANCE STANDARDS..............13 21. SPECIAL OPERATION - CAL RESET ................15 22. AVAILABE ACCESSORIES ....................17 CROPICO LTD – DO7 Issue 7/2001... -
Page 3: Supplied Accessories
The use of makeshift fuses, and the short-circuiting of fuse holders is prohibited. Whenever it is likely that the protection has been impaired, the apparatus shall be made inoperative and be secured against any unintended operation and returned to our factory or Agent for rectification CROPICO LTD – DO7 Issue 7/2001... -
Page 4: Introduction
Display range 6000 Simple push-button selection of the range required, ensures that the DO7 may be easily used by unskilled personnel. Error and status warnings are illuminated when appropriate. The utmost care has been taken to ensure that the ohmmeter will withstand an accidental mains voltage applied to the measuring terminals, but it is not recommended that voltage should be applied. -
Page 5: Battery Charging
The display will blank when the battery voltage is too low to sustain measurements, and the battery state indicators show the current state of charge. The DO7 will operate whilst charging on all ranges except the bottom two, and an additional error of approximately 8 digits may be observed with mains supply connected. -
Page 6: Battery Replacement
NOTE: Measurements on the lowest range 600µΩ will have an additional zero offset of up to 20 digits, if the measuring current is applied for long periods. This offset can be eliminated by using the average measuring mode. CROPICO LTD – DO7 Issue 7/2001... -
Page 7: Description Of Controls
DESCRIPTION OF CONTROLS 4 Digit LCD Display Measuring Terminals Mains Socket Remote Start Socket Battery Status Indicator RS232/Printer Socket Range Switches Calibration On/Off Power Switch CROPICO LTD – DO7 Issue 7/2001... -
Page 8: Range Selection
METHODS OF MEASUREMENT 9.1 Ohmmeter Connections The Digital Ohmmeter type DO7 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;... - Page 9 Fig. 9.1 Combined current and potential probes Fig. 9.2 Various types of resistors CROPICO LTD – DO7 Issue 7/2001...
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Page 10: Power Up
The DO7 will perform an automatic zero sequence and finally sets to the following default start-up mode ready for use. The selected measuring range will be 60Ω, and the DO7 will then be in stand-by mode. MEASUREMENT Connect the resistance to be measured (Rx) to the measuring terminals in accordance with the diagram on the instrument panel. -
Page 11: Remote
To replace the protection fuse, the top instrument panel should be removed, but only after the mains supply and all input connections are removed. The protection fuse is located on the main printed circuit board. Only replace with the correct fuse rating. CROPICO LTD – DO7 Issue 7/2001... -
Page 12: Calibration Process
21 (CAL RESET). CAUTION The DO7 will be factory-calibrated to its full accuracy when delivered and any recalibration by the user will invalidate this initial calibration. The user should therefore be certain that only authorised and competent personnel are permitted access to the calibration facility, which is key protected. -
Page 13: Calibration
The reading should be 40.00 +/-1 digit. Note the actual reading in the Calibration Test Results sheet. 19.7 Reset the DO7 to +ve. Set the calibration rig to 4 Ohm, +FS and wait for the reading to settle. The reading should be 4.00 +/-1 digit. Note the actual reading in the Calibration Test Results CROPICO LTD –... -
Page 14: Using Discrete Resistance Standards
40, 4, 400m, 40m, 4m and 400u Ohm 20.2 In all measurements the P1 and P2 terminals are conventionally connected. Bear in mind that thermal emfs may be present. The DO7 is particularly sensitive to these on the 600u Ohm range. 20.3 For FS measurements, connect the C1 and C2 leads in the conventional manner (see Fig 20.1). - Page 15 CROPICO LTD – DO7 Issue 7/2001...
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Page 16: Special Operation - Cal Reset
This test is performed at power-up and failure is indicated by the HELP message. 21.2 Turn the DO7 power ON. Wait for the display test to complete and the HELP message to appear. 21.3 Insert the calibration key into the panel switch and turn to CAL. - Page 17 CROPICO LTD – DO7 Issue 7/2001...
- Page 18 OTHER ACCESSORIES FSO1 Foot Switch for remote start PRO1 Portable thermal Printer 1 Metre Cable Clamp – Wood Base 1 Metre Cable Clamp – Metal Base CBO2 Lead Bag attaches to lid RS101 RS232 Cable CROPICO LTD – DO7 Issue 7/2001...
- Page 19 UNIVERSAL CALIBRATORS POWER ANALYSERS HIPOT TESTERS ELECTRICAL SAFETY TESTERS Phone, fax or e-mail for further information on the above or for a copy of our general catalogue Phone: 416-742-4448 Fax:- 416-749-5053 info@duncaninstr.com E-mail:- www.duncaninstr.com Website:- CROPICO LTD – DO7 Issue 7/2001...
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