USER MANUAL ECN135 DO5000
Contents
1. DO5000 OCropico Ltd 2000 25 Iss 4 2001 5 4 5 5 Resistance measurement The DOS5000 should be in the measurement STOP mode In this mode the measuring current is switched off and the current terminals are shorted internally Connect the measuring leads as described in section 5 3 before starting the measurement select the current level and mode required as described in section 4 2 WARNING the maximum measuring current is 10 Amps on the lowest 3 measuring ranges ensure that the current level selected will not damage the resistance being measured Select the range required see 4 1 or auto range To start the measurement press the MEAS button the measured resistance value will be displayed on the screen Resistance measurement with temperature compensation Temperature compensation should be used when measuring the resistance of materials which have a high temperature coefficient Copper for example has a temperature coefficient of 0 3980 K The value of the resistance measured will therefore vary with the temperature of the copper To obtain consistent and meaningful results the resistance values may be related to a set ambient temperature normally 20 C Example Copper with a temperature coefficient of 3980ppm k 0 3980 k Resistance of Copper 18 000 mQ 18 358 mQ 18 716mQ 19 075 mQ 1 99 3 98 5 97 To measure with the temperature compensation proceed as in 4 4 but in addition connect the temperature sensor2. 3 2 3 2 1 3 3 About the DO5000 This section introduces you to the features and functions of the DO5000 Microhmmeter The Front Panel ON OFF Switch The On Off switch switches the DO5000 on and off During Power On the last measurement function setup is restored The rear mounted cooling fan will always run and the cooling vent must not be blocked ON OFF Switch Battery Version DO5002 The Front Panel on off switches the DO5002 on and off The rear switch situated adjacent to the inlet filter switches the mains supply on off The Function Keypad All DO5000 measurements and programming facilities are accessed through the function keypad A brief description of key functions is given in the following table For a detailed description of how to use the keys to configure and operate the DO5000 refer to section 4 D05000 Cropico Ltd 2000 12 Iss 4 2001 3 4 Table Summary of basic functions Key Direct Symbol Description Function function or menu Selection of Range 3mQ Selects 3mQ range Selects and displays the measured value Direct using the 3mQ range from 30mQ Selects 30mQ Selects and displays the measured value Direct using the 30mQ range Selects and displays the measured value Direct using the 200mQ range from keypad Selects 3Q range Selects and displays the measured value Direct using the 3Q range from keypad Selects 30Q range Selects and displays the measured value Direct using the 3
3. 20 C where Rc resistance corrected for a reference temperature 20 C Average temperature coefficient tx Component temperature at time of the measurement The temperature compensation mode should be used when measurements are required to be referenced to 20 C This is particularly useful when measuring materials with a high temperature coefficient such as copper as the ambient temperature varies so will the resistance value being measured Using the temperature compensation mode references all values back to a temperature of 20 C The compensated resistance value measured will be displayed in large digits in the centre of the display and the true resistance will be displayed in smaller text below The ohms sign of the compensated value will show a 20 in the centre to indicate that the value is referenced to 20 C Figure 4 4 1 Measurement screen with temperature compensation 4 5 AUTOI 30mQ 10 0A AVE Slow 18 000 m T 22 00 C Ext RX 18 010 mQ Cu Meas Limits DO5000 Cropico Ltd 2000 19 Iss 4 2001 Press Lim To select the Limits menu Two options are then available Meas which enables limits to be set with reference to the measured values or O C which enables the open circuit voltage to be limited to either 20mV or 50 mV Note Open circuit limits are not available on 3K x 30K ranges Select Meas to select the measurement limits menu Select Alm to turn the audio alarm Beeper on or
4. 4 11 5 1 Keys only Measure restricts operation to the Measure Key only Once the Key Lock facility is enabled the measurement screen will display a small padlock symbol in the bottom right hand corner Measure Hold function Press Mes to hold the measured value on the display NOTE this does not interrupt the measuring current which will still be flowing through the resistance being measured WARNING when measuring with 10 Amps measuring current it is possible to produce small sparks at the current terminals Press Mes to resume display of measured values Measure Stop Function Press STOP to stop the measurement this disconnects the current from the terminals and internally shorts the current terminals discharging any voltage that may be stored in capacitive samples ZERO Function Press ZERO to null the current display reading to zero all subsequent measurements will be relative to the nulled value Pressing ZERO again cancels the zero Changing range or selecting auto range also cancels the zero MEASURING WITH THE DO5000 Connecting to the DO5000 The DO5000 uses a four terminal method of measurement which eliminates errors due to lead resistance The measuring leads plug into the four front panel safety sockets The sockets are marked U U I amp I Connections to the resistance to be measured should be as per Figure 5 1 1 Figure 5 1 1 Connection diagram NOTE It is important to connect
5. Rdgs the current number of readings is displayed to accept that value press Yes to store a different number press No you will then be asked to enter the value of the number of readings to be stored in the log Enter the number required between 1 and 4000 and press OK Press Rev to review the current readings stored in the log these will be displayed in table form as shown in Figure 4 6 1 Figure 4 6 1 Data Logging Screen 4 7 Log Range Resistance Date Time 1 30kQ 0 000 10 08 99 14 10 35 2 30kQ 0 000 10 08 99 14 10 37 3 30kQ 0 000 10 08 99 14 10 38 4 30kQ 0 000 10 08 99 14 10 40 5 30kQ 0 000 10 08 99 14 10 42 6 30kQ 0 000 10 08 99 14 10 44 Once the logging mode has been switched ON the measurement display will be in HOLD mode and the bottom line of information text will show the total number of samples to be stored and the number of measurements already stored Samples 40 40 To start the logging press the MES key the measurements will start and the values stored Once the set number of values has been stored in the log the measurements will be stopped Press Stats to display the statistical analysis of the values stored in the log The following values will be computed and displayed Minimum value Min Maximum value Max Mean value Mean Peak to Peak value PtP Standard Deviation SD Setup Memory To enable up to 10 measurement configurations to be setup and stored the DO5000 has 10 memories to store and rec
6. interfaces available for automated monitoring and controlling applications e Rear panel terminals available as an option e Fast mode 50 measurements second for production testing The DO5000 is a true four wire measuring instrument eliminating the need to compensate for lead resistance The measured value is displayed in large characters with decimal point and units kQ Q or mQ For maximum accuracy the measuring current may be automatically reversed and the average of measurement displayed For measurements on unstable samples a rolling average filter is available Resistance measurement accuracy is typically 0 03 1 year specification and the value may be displayed with or without temperature compensation the final accuracy depends upon the current selected The front panel measurement connections are made via 4mm sockets located on the front panel rear panel connection is an option The connection to a Pt100 temperature sensor is made with a standard DIN connector DO5000 OCropico Ltd 2000 4 Iss 4 2001 1 2 Definitions and Terminology uQ microhmm 0 000001 Ohm mO milliohm 0 0010hm kQ kilohm 1000 Ohm Pt100 Platinum resistance thermometer 1000 at 0 C U U Voltage connection H I Current connection Four terminal measurement Kelvin principle of measurement using 2 wires 1 L to pass current through Rx and 2 wires P P2 to measure the voltage Kelvin clips Crocodile clips with isolated jaws one side being
7. lead set comprising of miniature Kelvin clips KC2 with 1 meter leads attached terminated with banana plugs Jaw opening 6mm Suitable for fine wires DO5000 Cropico Ltd 2000 29 Iss 4 2001 6 2 WIRE CLAMPS For the precise measurement of 1 meter cable samples we offer 2 wire clamp options Ordering Code 1 metre wire clamp with hardwood base suitable for cable diameters up to 25mm temperature sensor suitable for wire cross section 1 to 1000mm 1 metre wire clamp with metal base and provision for 6 3 COIN JIG for the measurement of bi metal coins to ensure the resistance of the two metals is within pre defined limits Ordering Code CJO1 COIN JIG will accept all bi Metal Coins 6 4 INTERFACES FOR THE REMOTE CONTROL OF D05000 Ordering Code DO5000 RS232 Talk Listen Serial RS232 Interface DO5000 GPIB Talk Listen IEEE 488 Interface DO5000 PLC PLC Interface includes Analogue Output and Potential free Contacts for Hi Lo limits 6 5 TEMPERATURE PROBE For the sensing of the temperature of the sample under test Ordering Code 5000 Pt100 Pt100 Temperature Sensor Probe length 200mm diameter 6mm Fitted with 1 Metre Lead and DIN Plug DO5000 OCropico Ltd 2000 30 Iss 4 2001 Additional Products From Cropico DIGITAL OHMMETERS RESISTANCE BRIDGES RESISTANCE DECADE BOXES RESISTANCE STANDARDS DIGITAL THERMOMETERS THERMOCOUPLE SIMULATORS THERMOCOUPLE REFERENCE JUNCTIONS THERMOCOUPLE SELECTOR SWITCHES PT100 SIMULATO
8. probe see section 6 for accessories details and part numbers to the front panel socket Select the temperature compensation measurement mode as described in 4 4 Alternatively if the ambient temperature is stable a manual value may be entered in this case a temperature sensor is not required The true measured resistance value will be displayed in large digits on the DO5000 screen and the compensated value will be shown in smaller digits below the main display The measured or set temperature will also be shown DO5000 OCropico Ltd 2000 26 Iss 4 2001 Figure 5 5 1 Display screen temperature compensation mode 30mQ 10 0A AVE Slow 18 358 mQ T 25 00 C Ext RX 18 000 mQ Cu Meas Cont 5 6 Measurement with Limits The measurement limits function permits the fast easy sorting of components To select the limits function see section 4 5 Both high and low limit values may be set If the measured value is within the set limit boundaries then front panel green PASS LED will illuminate If the measured value falls outside the set limits then the red FAIL LED will light a warning beeper will also sound and the instrument display will show FAILED with chevron arrows pointing to the left for value to low and to the right for value to high Figure 5 6 1 Measurement display with limits value to low AUTOI 30mQ 10 0A AVE Slow 18 000 mQ lt lt FAILED lt lt Cont Figure 5 6 2 Measurement display with limits value t
9. the I current leads outside the U potential leads DO5000 OCropico Ltd 2000 23 Iss 4 2001 5 2 5 2 1 5 2 2 5 3 Connecting to the resistance The Digital Microhmmeter DO5000 employs a four wire method of measurement i e it is necessary to make four connections to the resistance 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 connect the test resistor to the current supply circuit Connect the red leads to the U and I sockets and the black leads to the U and I sockets Connect to the resistance under test as shown in figure 5 1 1 Cleanliness is important and if the sample is not clean a rub with an abrasive paper to remove oxides is recommended It is not always possible to use the combined current and potential crocodile clips Kelvin clips in which case test leads with spade tags or special fixtures may have to be made to suit the particular application We offer a variety of different lead and fixture types which are list in section 6 1 DO5000 OCropico Ltd 2000 24 Iss 4 2001 Figure 5 3 1 Diagram of different connection configurations Cl P1 P2 C2 Connection to Cable Joint C2 Cl P1 P2 Connections to Current Shunt Connections to Stud Terminals Measurement with duplex handspikes Cl P1 P2 C2
10. trigger a new measurement the direct function key MEAS should be pressed Press Read Rate to select Fast or Slow measurement mode With Fast mode selected the DO5000 will measure at 50 measurements per second This mode is intended for automatic measurements using one of the interfaces to output the measured values or control an external process The measured value will be displayed in small text on the screen when Fast measurement mode is used DO5000 OCropico Ltd 2000 18 Iss 4 2001 4 4 For manual operation the Slow measurement mode should be selected This will read at 2 measurements per second and offer the highest accuracy and resolution Press Filt to select the digital filter this feature should be used when the sample to be measured is unstable and the measured value displayed is constantly changing The filter is a rolling average of n measurements where n may be set between 1 and 32 Temperature Compensation Press Mode to select the setup menu for temperature compensation Press Ext to select the external temperature sensor Press Man to select the manual compensation temperature the display will request that you enter the ambient reference temperature Press Cu to select compensation for copper 3930 ppm C Press Al to select compensation for Aluminum 4100 ppm C Press Usr to enter alternative user coefficients The equation used to calculate the corrected resistance is Re 20 C Rx 1 tx
11. 00 range from Selects 3002 range Selects and displays the measured value Direct using the 3000 range Selects 3kQ range Selects and displays the measured value Direct using the 3kQ range from keypad Selects 30kQ range Selects and displays the measured value Direct using the 30kQ range from keypad selects autorange The instrument will select the optimum Direct range required and display the measured from value keypad DO5000 OCropico Ltd 2000 13 Iss 4 2001 Setting up measurement options CURR Current selection Selects the current to be used for measurement plus single polarity or switched average COMP Temperature Selects temperature compensation Menu compensation Measurement Nulls the display at the current reading display zero and displays measured values relative to function the nulled value Measure run hold Display hold function triggers measurement and data logger cycles Measure stop start Stops the current measurement and Direct disconnects the measurement current from keypad Logging Data and Statistical Displays LOG Data logging Selects the data logging and statistical Menu function analysis menu functions Options and Configuration LIMIT Selects Hi Lo limit menu MENU Menu functions Selects interface options and calibration Menu functions Scroll and Contrast Control Up command key Controls the display contrast and page Display contrast scroll functions page scroll Down command Contro
12. ANDS See attached extract from the Remote Interface Manual for details and an example programme OTHER ISSUES Due to inductive effects Overange Error Polarity Error Excess Resistance in Current Leads Error and Open Circuit Error will all be ignored until the final measurement If the Autorange changes the range during a measurement then the Number of Readings counter will reset to one If the measurement does not settle within the maximum number of readings then the Resistance bit Bit 9 of the Questionable Data Condition Event Registers will be set When in Manual mode a short beep will be heard when the measurement is completed or a longer beep if the measurement failed to settle ACCESSORIES 6 1 LEADS The DO5000 may be used with a variety of lead sets The following are the available selection Remember if you do not see suitable leads for your application please consult our customer help desk Ordering Code HSO1 P Duplex Handspikes with 2 5 metre lead length current and potential spikes suitable for plate or Bussbar measurements lead lengths LS03 P Large Kelvin clips with 3 metre lead length suitable for attaching to rods bars or cables up to 38mm diameter LS04 P As LS03 P but with lead lengths 3 and 15 metres LS05 Executive lead set consisting of 4 x 1 metre leads with banana plugs 4 x crocodile clips 4 x test prods and 4 x Kelvin clips KC1 jaw opening 4mm LS06 P Kelvin
13. IVE ENVIRONMENTS This instrument is not designed to operate while wet in an environment of condensing humidity or in the presence of flammable gases or vapours The operation of this instrument in such an environment constitutes a safety hazard CERTIFICATION CROPICO certifies that this product met its published specifications at the time of shipment from our factory All calibration measurements performed in the manufacture of this instrument are traceable to the National Physical Laboratory London ASSISTANCE For after sales support and product service assistance please contact CROPICO Customer Support Group Contact information is provided in the operation instruction manual DO5000 OCropico Ltd 2000 Iss 4 2001 Table of Contents 1 Introduction 1 1 Overview 1 2 Definitions and Terminology 1 3 Standard Features of the DO5000 1 4 Principles of Measurement 1 5 Specification 1 5 1 Measurement Accuracy 1 5 2 Programmable Current 1 5 3 Measurement Accuracy with Current Levels 1 5 4 Temperature Compensation 1 5 5 Conditions of Use 1 5 6 Lead Resistance 1 5 7 Mains Supply 1 5 8 Battery Operation 1 5 9 Weight and Size 2 Setting up the DO5000 2 1 Safety Information 2 1 1 Mains Voltage Selection and Changing the Fuse 2 2 Unpacking the Instrument 3 About the DO5000 3 1 The Front Panel 3 2 ON OFF Switch 3 3 The Function Keypad 3 4 Table Summary of Basic Functions 3 5 About the DO5000 Display Screen 3 6 About the DO5000 Functio
14. RS PRECISION WATTMETERS INSULATION TEST SETS 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 020 8684 4025 Fax 020 8684 4094 E mail enquiries cropico com Website WWW Cropico com DO5000 Cropico Ltd 2000 31 Iss 4 2001
15. USER MANUAL Part No 610018 ECN135 Issue 6 2 DO5000 DO5000 OCropico Ltd 2000 Iss 4 2001 ENGLISH IMPORTANT SAFETY INFORMATION 10 08 99 GENERAL This instrument has been designed and tested to comply with the Electromagnetic Compatibility Directive 89 336 EEC and Low Voltage Directive 93 68EEC in accordance with EN 61010 1 1995 relating to the safety requirements for electrical equipment for measurement control and laboratory use Before connecting the instrument to the mains supply please ensure the following safety precautions have been read and understood SAFETY SYMBOLS The following symbols are used to describe important safety aspects of this instrument these symbols appear on the instrument and in the operation instructions A Attention Symbol Indicates a potentially hazardous condition exists and that it is necessary for the operator to refer to the instruction manual to ensure the safe operation of this instrument Hot Surface Warning Indicates a hot surface that may be at a temperature capable of causing burns refer to the instruction manual for further safety information Caution Risk of Electric Shock Indicates hazardous voltages may be present refer to the instruction manual for further safety information Protective Conductor Terminal For protection against electrical shock during a fault condition This symbol is used to indicate terminals that must be connected to electrical ground before operating
16. all these configurations Press MENU Press Mem to select memory menu Press STOR to store the current measurement setup you will be prompted to enter a memory store number 0 to 9 selecting the store number saves the current setup to that store number Press RCL to recall a previously stored setup you will be prompted to enter the memory store number that you wish to recall entering that store number recalls the stored configuration for immediate use Press List to display a list of memories in current use Press CLR to clear a previously stored configuration you will be prompted to enter the store number entering the number will erase the stored parameters from that memory The following parameters will be stored when saved to memory DO5000 OCropico Ltd 2000 21 Iss 4 2001 4 8 PARAMETER DEFAULT VALUE Range 30kOhm range Auto range on auto 1 Current direction positive Current Magnitude 100 Current mode DC Trigger mode continuous Reading rate slow Temperature compensation off Temperature compensation mode manual Temperature compensation material copper Manual compensation temperature 20 C Filter off Filter No of readings 10 Measurement limits off Measurement limits alarm on Measurement limit maximum 30 kOhm Measurement limit minimum 0 Open circuit limit off Log mode off Log mode No of readings stored 10 Display Menu Press MENU to select the display menu Press RESET to reset measureme
17. e 115 V 103 127 V 47 63 Hz 2 5A T 230 V 207 253 V 47 63 Hz 1 25A T 1 5 8 Battery Operation DO5002 Two rechargeable sealed lead acid batteries are fitted internally together with the battery charging circuits The chargers will maintain the batteries in good condition automatically adjusting the charge rate to suit the battery state Full measurement capability is maintained whilst batteries are charging Battery Capacity Digital 11 hours continued use with display backlight on Analogue Over 6000 simple measurements in fast mode with 10A measuring current Approx 3000 measurements slow mode 1 5 9 Weight and Size Size 131 x 339 x 324 mm H W D Weight 9 8 kg DO5000 10 5 kg DO5002 DO5000 OCropico Ltd 2000 9 Iss 4 2001 N 2 1 DO5000 Setting up the DO5000 Safety information Please read and follow these important safety instructions Read the safety information at the beginning of this manual before operating the DO5000 Make the necessary electrical safety connection checks In particular select the correct line voltage and make sure that the correct fuse is installed Incorrect voltage or fuse selection present both an electrical safety and a fire hazard Ensure that the rear panel fan is operating and that the vent is not blocked When connecting to an electrical supply mains supply the mains cord provided with the equipment should be used and connected only to a mains supply with a su
18. equipment SUMMARY OF SAFETY PRECAUTIONS The following general safety precautions must be observed while operating or servicing this instrument Failure to comply with these precautions may result in personnel injury or death INSTRUMENT ELECTRICAL EARTH This instrument is designed as a Class 1 electrical safety insulation device To ensure continued protection from electric shock the instrument chassis must be connected to an electrical ground The instrument is supplied with an AC power cable with an earth connection LIVE CIRCUITS DANGER Do not connect the power supply to or operate this instrument with the protective covers removed Component replacement and internal adjustments must be made by qualified service personnel Do not replace components with the power cable connected Under certain conditions dangerous voltages may exist with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them DO NOT MODIFY THIS INSTRUMENT OR SUBSTITUTE PARTS Because of the danger of introducing additional hazards do not perform any unauthorised modification or install substitute parts to the instrument Only fuses with the rated current voltage and specified type should be used failure to do so may cause an electric shock or fire hazard Return the instrument to Automatic Systems Laboratories for service and repair to ensure the safety features are maintained DO NOT OPERATE IN EITHER DAMP OR EXPLOS
19. it The 200mQ range has a scale length of 20 000 1 5 2 Programmable current The measurement current is adjustable on each resistance range as follows 1uA 10mA 100mA The accuracy of current is typically 0 25 1 5 3 Accuracy against current level Range 100 Current 50 Current 10 Current 0 03 Rdg 0 01 FS 30mQ__ 0 03 Rdg 0 01 ES 1 5 4 Temperature compensation The accuracy of the temperature measurement is 0 1 and uses a standard Pt100 sensor This accuracy does not include errors due to the sensor itself The temperature measurement range is 0 40 C and the resistance measurement is referenced to 20 C when this option is used DO5000 OCropico Ltd 2000 8 Iss 4 2001 1 5 5 Conditions of use The instrument must be used inside in a horizontal position Temperature Storage 10 C 60 C Operation 0 C 45 C Full accuracy is achieved after 10 minutes warm up and for a relative humidity lt 50 Altitude up to 2000 metres Maximum humidity rate 80 for a temperature of 31 C 1 5 6 Lead resistance A maximum lead resistance which may be calculated as 0 5Q measuring current is permissible in each of the four measuring leads The display will indicate if the current lead resistance is too high so MEASURENT ERROR Current lead resistance too high 1 5 7 Mains supply Universal power inlet Maximum Power consumption 450VA 45 65Hz Nominal Voltage Voltage Range Fuse Typ
20. itable earth connection Under no circumstance should the equipment be operated with earth disconnected Mains voltage selection and Changing the fuse The mains inlet socket is located on the rear panel to select the correct mains voltage and to replace the fuse proceed as follows Front panel ON OFF switch in the OFF position Remove the power cord from the inlet socket With a small screwdriver remove the selection sub assembly from the inlet module Remove the fuse Take off the pale gray plastic piece Select voltage 110 for a 115 volts main and 220 for a 230 volt main the 240 position is not used Replace the gray plastic piece to display the correct voltage in the sub assembly window Replace the correct value fuse according to the table 1 5 7 Replace the selection sub assembly in the inlet module Connect the power cord Cropico Ltd 2000 10 Iss 4 2001 2 2 Unpacking the instrument When you unpack the DO5000 check that the following items are present before starting to use the unit DO5000 Microhmmeter Mains Cord Operating manual Calibration Certificate Ri aa KO KO AS Please contact the CROPICO Customer Support Team immediately if any of these items are missing or damaged Please note that we offer a wide selection of measuring leads and test fixtures see section 6 please consult our sales staff to order the items most suited to your application DO5000 OCropico Ltd 2000 11 Iss 4 2001 3 1
21. ls the display contrast and page key Display scroll functions contrast page scroll DO5000 Cropico Ltd 2000 14 Iss 4 2001 3 5 About the DO5000 Display screen The liquid crystal graphic display clearly indicates the measured resistance and measurement status as well as displaying available menu options and measurement analysis when selected Figure 3 5 1 Example of Resistance Measurement Mode AUTOI 30mQ 10 0A AVE Slow 18 000 mQ The keypad below the display screen controls the DO5000 Some keys perform a function directly For example 3mQ selects 3mQ range Other keys switch the display to configuration mode which allows you to select options through a series of menus The option menus all follow the same format The configuration mode is indicated by splitting the screen with a dashed line directly below the main reading An instruction prompt under the dashed line indicates the current menu The available menu options are displayed on the bottom row of the display as shown in figure 3 5 2 Press the corresponding function key to select an option Figure 3 5 2 Example of current mode menu AUTO1 30mQ 10 04 AVE Slow 18 000 mQ Indicates current mode Indicates menu options DO5000 OCropico Ltd 2000 15 Iss 4 2001 The lines printed on the front panel helps you to link the menu option printed on the screen with the correct key on the keypad 3 6 About the Function keys The top row of func
22. n Keys 4 Setting up measurement options 4 1 Range Selection 4 2 Current Selection 4 3 Measurement Mode 4 4 Temperature Compensation 4 5 Limits 4 6 Data Logging Function 4 7 Setup Memory 4 8 Display Menu 4 9 Measure Hold Function 4 10 Measure Stop Function 4 11 Measurement Zero 5 Measuring with the DO5000 5 1 Connecting to the DO5000 5 2 Connecting to the Resistance to be Measured 5 3 Lead Connection Types 5 4 Resistance Measurement 5 5 Resistance Measurement with Temperature Compensation 5 6 Resistance Measurement with Limits 5 7 Measurement of Inductive Devices 6 Accessories 6 1 Leads 6 2 Wire Clamps 6 3 Coin Jigs 6 4 Interfaces 6 5 Temperature Probe DO5000 OCropico Ltd 2000 Iss 4 2001 INTRODUCTION OVERVIEW The DO5000 Microhmmeter is a high accuracy instrument designed for industrial and laboratory resistance measurements Features include e Programmable measuring current user selectable in 100 steps e Automatic temperature Compensation e Hi Lo Limits with red green front panel warning Pass Fail lamps e Switched current mode with automatic averaging ensures elimination of thermal emf errors e Large graphic LCD display for resistance measurement values as well as configuration settings and statistical results e Advanced functions include data logging and statistical reporting with max min average values peak to peak values and standard deviation e Analogue output IEEE 488 and RS232 communication and PLC
23. nt configuration to default values Press MEM to select memory menu Press LCD to select LCD display menu Press w to turn backlight ON or OFF Press and hold O to lighten then display contrast Press and hold to darken the display contrast Press Set Up to select the configuration menu Beep turns the beeper on and off Time Date enables the current time and date to be set Lang enables the display to be toggled between English and French language Temp Unit permits the temperature units to be switched between C and F Line Freq allows the measurements to be synchronized at 50Hz or 60Hz and should be set in accordance with mains supply frequency used this is particularly important when measuring in fast mode Press Ver to display the model number and software version Press Rem I F to select the remote interface option menu Press Cal to select the Calibration menu which will be fully covered in section Press Key Lock to select the option of locking the keyboard to ensure no parameters are changed without authorisation You will be asked to enter a pass code before you can enter this menu The default pass code is 9252 and this can be changed once you have entered the Key Lock menu Three options are available ALL enables all keys and permits normal control of the DO5000 MEM permits operation of the Memory Recall and Measure DOS000 Cropico Ltd 2000 22 Iss 4 2001 4 9 4 10
24. o high AUTOI 30mQ 10 0A AVE Slow 18 000 m0 gt gt FAILED gt gt Cont DO5000 OCropico Ltd 2000 27 Iss 4 2001 5 7 Measurement of Inductive Devices GENERAL When the Settling algorithm is selected and the MEAS button pressed continuous measurements will be made until two consecutive results are within the selected limit or until the selected maximum number of measurements has been reached In the first case the final result will be displayed and in the second case the message MEASURMENT ERROR Failed to Settle will be displayed If appropriate the result or the error value will also be datalogged sent out on the bus and sent to the Analogue Output on the PLC card Finally if the Measurement Limits facility is selected then the PASS FAIL result will be displayed The Settling facility can be used in SLOW mode only Normally the Settling facility should be used in SINGLE trigger mode and the above description assumes this However if CONTINUOUS trigger mode is used then the operation is the same except that once the measurement has settled the settling facility is effectively disabled and the DO5000 continues to take measurements without interrupting the current until STOP is pressed When MEAS is pressed again the Settling facility will be re engaged MENU ACCESS The menu is accessed by pressing MODE followed by Sett From this point
25. off Select Max to set the max or upper limit value press Chg and the screen will prompt you to select the units mO Q kO Select the required units and the display will ask for a new max limit value to be entered Use the numbered keypad to enter the required limit press OK to confirm Select Min to set Min or lower limit value proceed as for setting max limit The Green Pass front panel LED will light when the measured value is correct and within the set limits the Red Fail LED will light and the warning beeper will sound if the measured value is higher than the Max limit set or lower than the Min limit set The DOS000 screen will also display PASS or FAILED with gt gt to show value to high and lt lt to show value to low Figure 4 5 1 Measurement screen with limits 4 6 30mQ 10 04 AVE lt lt FAILED lt lt Cont To select the open circuit voltage limit from the Lim menu select O C the option of selecting either 20mV of 50mV limit is then available The measurement display will indicate in the top right hand corner which limit has been set Data Logging Function Press LOG to select the data logging menu Select New to initiate a new log the screen will prompt you to clear the current log Press Yes the screen will ask you confirm press yes again and the current log will be cleared of all stored values You are now ready to set up the new log DO5000 OCropico Ltd 2000 20 Iss 4 2001 Press No
26. sing AUTO key This key toggles the selected function as follows AUTOI auto ranges starting with the highest range AUTO2 auto ranges starting with the current range selected Range manual range is selected Current Selection Press CURR selects the current configuration menu I Ave Mag Quit Select the current direction I I or Ave Ave automatically switches the current in the positive and negative directions and displays the average this eliminates errors due to thermal emf Select the current Magnitude Mag Press Chng and you will be asked to enter the maximum current as a percentage 10 100 Enter the percentage required using the keys which are numbered in the top right hand corner press OK to confirm The current value for the range selected is displayed at the top center of the screen The percentage of maximum current set will be applied to all subsequent measurement ranges selected Measurement Mode Press MODE to select the measurement mode options Display Trig Read Q O Km Km Mode Rate Filt Quit For the greatest flexibility and versatility of measurement the DO5000 has many advanced features which can be selected from this menu DO5000 OCropico Ltd 2000 17 Iss 4 2001 Display The main value display can be set to read Q Q km or Km From the measurement MODE screen select Q0 Km this display will read 1 cable of 1Km in series Change No Len Unit Conn Quit OK Select No Display will ask you
27. the current I connection the other voltage U connection Indicates reading compensated for 20 C Q Km Indicates resistance per Kilometre Km Indicates cable length in Kilometres m Indicates cable length in metres DO5000 Cropico Ltd 2000 5 Iss 4 2001 1 3 Standard features of the DO5000 Microhmmeter include e Direct display of resistance e Illuminated display e Upto 10 Amps measuring current programmable 10 to 100 e Automatic Temperature compensation e Display hold function e Display zero function e 4000 event data logger e Statistical reporting e Measuring current reversal with auto average Hi Lo Limits with Red Green front panel warning LEDs e Fast measuring mode 50 measurements second General warning symbol This indicates that a hazardous condition may exist A You must read the relevant sections in this Operator s Manual before operating the instrument Display Measuring Terminals Mains ON OFF Switch Pt100 Temperature Probe Input DO5000 OCropico Ltd 2000 6 Iss 4 2001 1 4 Principles of measurement BLANK PAGE DO5000 OCropico Ltd 2000 Iss 4 2001 Specification 1 5 1 Measurement Accuracy 0 03 Rdg 0 01 FS 20ppm Rdg 4 30mQ 10A __ 0 03 Rdg 0 01 FS 30ppm Rdg 6ppm FS 3m 10A 100nQ 0 03 Rdg 0 02 FS 30ppm Rdg 6ppm FS The accuracy is quoted at full rated current with auto average current mode and the display count is 30 000 plus sign and un
28. the following parameters can be set On Off Selects Deselects the Settling Algorithm No Rdgs Selects the maximum number of readings to be taken 2 999 This will give a maximum measurement time of approximately 8 minutes Limit Selects the maximum number of display digits by which the two consecutive readings may differ for the measurement to be defined as settled 1 999 When the facility is selected the word Sett xxx will appear in the top right corner of the screen xxx shows the maximum number of readings to be taken but during a measurement it counts the number of readings taken when the measurement settled Sett will flash during measurement Note that if CONTINUOUS trigger mode is used then the counter will freeze at the number when the measurement settled even though measurements will continue EFFECT ON OTHER PARAMETERS Selecting the Settling facility will e Cause the Autorange to change range in a downward direction only Therefore only Autol autorange mode should normally be used e Deselect the Filter facility e Change Average current mode to Positive current mode e Cause an error message if in Fast mode DO5000 OCropico Ltd 2000 28 Iss 4 2001 PARAMETERS WHICH WILL DESELECT THE SETTLING FACILITY The Settling facility will be deselected if e Filter facility is selected e Average current mode is selected e Fast mode is selected REMOTE COMM
29. tion keys are only used to select menu options The lower row of function keys is enabled only when entering values these instances are covered later in this section Both rows of function keys are shown in figure 3 6 1 Figure 3 6 1 Function keys The Quit and OK menu options consistently use the QUIT and OK keys Use the Quit key to leave a menu or return to the Resistance Measurement mode screen Use the OK key to confirm a particular choice and continue to the next set of menu options Not all function keys are used to access the Configuration Mode Some just invoke the function which is printed on the key For example pressing ZERO immediately sets the measured value displayed to zero The rest of this section describes each key in detail and gives examples of how to configure the measurement to your requirements The last used set up conditions are stored when the instrument is turned off and restored upon switch on DO5000 OCropico Ltd 2000 16 Iss 4 2001 4 1 4 2 4 3 Setting up Measurement Options Note It is possible to reset the instrument to the original default start up conditions From the MENU mode press RESET to restore defaults Range Selection Two modes of range selection are possible Manual and Auto range The 8 ranges may be selected individually by pressing the appropriate range key The range selected is indicated on the top left hand side of the display Auto range is selected u
30. to enter the number of conductors 1 99 enter the number and press OK Select Len the display will prompt you to enter the cable length enter value Km To select the units to be displayed select Unit metre or Km can be selected Finally select Conn and the option to select whether the conductors are in series Ser or parallel Par is available Press OK to confirm Once these parameters are set the measured value will display in Q Km for any number of conductors 1 99 in series or parallel To display the cable length in Km select MODE Km the display reads 1 cable of 1Km in series Change No Len Unit Conn To change the number of conductors select No the display will ask you to enter the number 1 99 Enter the number and press OK Select Res and you will be prompted to enter the resistance of the cable in ohm Km enter the value and press OK To change the units press Unit you can now select Km or m Press OK to confirm selection To change the connection configuration select Conn and the option to select the conductors in series or parallel again press OK to confirm Once the configuration is complete press Quit to return to the measurement screen which will display the measured cable length in Km or m Press Trig Mode To select continuous measurement press Cont or Sing to select a single measurement this completes one measurement and holds the value on the display To
Download Pdf Manuals
Related Search