Instruction Manual.
Contents
1. MICROPROCESSOR CONTROLLED AUTO HOLD Test 1mA Sone 10 200 00 10 20 000 100mA 2000mo 100mA 200 0 Ha 20000 MIN 200 00 Van o 1 20 000 2000mOe 200 0mo DIGITALAMILLIOHM METER OFF m D Shan Test duration 1 TEST C QN asec RS 4 Current Range Table PREPARATION FOR Start Stop Test USE Liquid Crystal Display When unpacked the tester should be Rotary Selector Switch inspected for any visible signs of damage and the preliminary checks Meet LVD amp EMC requirements described in the user s manual should be performed to ensure that it is operating correctly If there is any sign of damage or if the instrument does not operate correctly return it to your nearest supplier info tursdaletechnicalservices co uk PRELIMINARY CHECKS Check the battery e If the battery symbol is shown on the LCD then replace the batteries with new alkalines batteries before proceeding Check the current regulation e Connect the current leads to C1 and C2 e Select a range and short the current test leads The RC led should go off indicating that the current regulation is ok Check the voltage measurement e Connect the potential leads to P1 and P2 e Short the P1 and P2 The display should indicate 0000 e Remove the short2. info tursdaletechnicalservices co uk to be the fault of our manufacturing with no charge for parts and service If we are unable to repair or replace this product we will make a full refund of the purchase price Consult the user s manual for proper instruction regarding use of this instrument Our obligation under this warranty is limited to repairing replacing or making refund of this test equipment which proves to be defective within forty eight months from the date of original purchase This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way so as in our sole judgment to injure their stability or reliability or which have been subject to misuse abuse misapplication negligence or accident or which have had the serial numbers altered defaced or removed Accessories not of our manufacture used with this product are not covered by this warranty All warranties implied by law are hereby limited to a period of forty eight months and the provisions of the warranty are expressly in lieu of any other warranties expressed or implied The purchaser agrees to assume all liability for any damages or bodily injury which may result from the use or misuse of the product by the purchaser or it s user his employees or others and the remedies provided for in this warranty are expressly in lieu of any other liability we may have including incidental or consequential damages
3. We reserve the right to discontinue models at any time or change specification price or design without notice and without incurring any obligation 15 CLEANING amp STORAGE Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents If the meter is not to be used for periods of longer than 60 days remove the batteries and store them separately BATTERY amp FUSE REPLACEMENT e Battery Replacement eThe tester continuously monitors the battery voltage and indicates when the batteries need to be replaced eThe tester s battery is situated under the tester eDisconnect the test leads from the instrument and remove the battery cover and the batteries eReplace with eight 1 5V AA pen light batteries taking care to observe correct polarity eAlkaline batteries are recommended eReplace battery holder and the battery cover e Fuse Replacement eThe fuse is located under the battery holder replace fuse open the battery cover Then remove and replace the fuse located under the battery holder eOnly replace with same fuse specification 250mA CAT IV Is for measurements performed at the source of the low voltage installation 12 info tursdaletechnicalservices co uk CAT Il Is for measurements performed in the building Installation CAT Il Is for measurements performed on circuits directly connected to the low voltage installation CAT I Is for measurements performed on
4. www pce industrial needs com DIGITAL MILLI OHMMETER PCE MO 2002 INSTRUCTION MANUAL Tursdale Technical Services Ltd Unit N12B Tursdale Business Park Co Durham DH6 5PG United Kingdom Phone 44 0 191 377 3398 Fax 444 0 191 377 3357 info tursdaletechnicalservices co uk http www industrial needs com info tursdaletechnicalservices co uk DESCRIPTION PAGE SAFETY RULES 01 GENERAL 02 03 FRONT PANEL LAYOUT 04 PREPARATION FOR 05 PRELIMINARY 05 PRECAUTIONS inti Rudi 06 MEASUPING us secca iate ts 07 SIMPLIFIED MEASUREMENT 08 APPLICATIONS 09 tis at 10 THERMAL EFFECTS sss 11 FUSES REPLACEMENT 12 INPUT LIMITS amp 13 SPECIFICATIONS ec ritate tt 14 SPARES amp ACCESSORIES 15 LIMITED WARRANTY 15 CLEANING amp STORAGE eee 16 BATTERY amp FUSE REPLACEMENT 16 info tursdaletechnicalservices co uk SAFETY RULES The meter has been designed with safety in mind However no design can completely protect against incorrect use Electrical circuits are dangerous and lethal through lack of caution or poor safety prac
5. P1 can be shorted as well as C2 and P2 A DC20V MICROPROCESSOR CONTROLLED AUTO HOLD Test Current Range 1mA 20000 10 200 00 10 20 000 2 feme H 100 2000 1 a 100mA 200 0 Dc 20000 200 00 e VAN o VANNES ms 20 000 Z N 2000mo 200 0mo DIGITAL MILLIOHM METER OFF a ae EUN CC M ON d The meter Digital milli ohmmeter with its measuring range of 100u ohms to 2000 ohms is suitable for a wide range of applications such as Measuring the winding resistance of electric motors generators And transformers e Bond testing in mines aircraft railways ships domestic industrial wiring installations e Measuring the ring main continuity testing in industrial and domestic wiring installations Measuring resistance in electronic equipment such as shunts pcb tracks switch and relay resistance e Checking compression joints on overheads lines e Testing and maintenance of switchboard sub station equipment on such items as fuses joints contacts and bonds info tursdaletechnicalservices co uk info tursdaletechnicalservices co uk TEST LEADS The test leads supplied with the instrument are suitable for connecting to conductors up to 17mm in diameter or
6. bus bars 17mm tick There will be instances where the item being measured require larger jaws and the user is advised to make up his own leads There will be occasions when longer leads are required due to the geometry of the item being tested Some guidance notes should as sit in the assembly of such leads Length of the potential leads should be as short as possible Insulated 16 0 2mm tinned copper wire is recommended The two potential leads should have the same length to minimise inaccuracies due to unbalance SUPPLIED POTENTIAL TEST LEADS P1 test lead is of Red color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets P2 test lead is of Blue color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets SUPPLIED CURRENT TEST LEADS C1 test lead is of Green color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4mm shrouded color coded sockets C2 test lead is of Black color shrouded 4mm safety plug which at one end have a crocodile alligator clip for connection to the resistance to be measured The other end plugs into the meter 4
7. Measuring Ranges 0 200 0m ohms in steps of 100uohm 0 2000m ohms in steps of 1m ohm 0 20 00 ohms in steps of 10m ohm 0 200 0 ohms in steps of 100m ohm 0 2000 ohms in steps of 1 ohm Accuracy 0 5 of reading 2 digits over the Operating temperature range 15 C to 55 C with the supplied test leads Test Current 1mA gt 2000 ohms range 10mA gt 200 20 ohms ranges 100mA gt 2000m 200m ohm ranges Test Current Accuracy 0 1 Protection Fuses Supply 1 5A HBC 5 x 20mm DIN Current 1A HBC 5 x 20mm DIN Voltage 0 5A HBC 5 x 20mm DIN SAFETY LVD BS EN 61010 1 EMC BS EN 50081 1 BS EN 50082 1 MECHANICAL Case Height 110mm Case Width 250mm Case Depth 190mm Bump Test 68 2 29 Vibration Test IEC1010 clause 8 3 Drop Test IEC1010 clause 8 4 Impact Test IEC1010 Clause 8 2 Weight 1 542kg Rated environmental conditions 1 Indoor Use 2 Pollution Degree 2 3 Altitude up to 2000 meter 4 Relative humidity 80 max 5 Ambient temperature 0 C 40 C 14 SPARES amp ACCESSORIES At the date of printing this user s manual accessories were not yet available Please contact the factory for further information Spares are available from your nearest distributor LIMITED WARRANTY We warrant the product manufactured by us to be free from defective material or factory workmanship and agree to repair or replace this product which under normal use and service disclose the defect 11
8. cal cleaning agents must not be used MEASURING e Perform the preliminary checks before proceeding with measurement and ensure that the precautions listed are observed e Connect the test leads color coded to the instrument as shown e The current test leads must always be outside of the potential test leads info tursdaletechnicalservices co uk e Please note that the shorter the potential test leads the better long potential test leads will pick up noise e Screened test leads are recommended for better environmental noise rejection Compression C c P BB A SAI MAX DC20V MICROPROCESSOR CONTROLLED AUTO HOLD NO TEST sami O AC 17 100 Ome O B wn 20000 1 200 00 Vano Van 75 20 000 2000mo 200 0mo DIGITAL MILLIOHM METER OFF me ON sete SIMPLIFIED MEASUREMENT The 4 wires measurement has many advantages The errors due to the resistance of the test leads and the contacts as well as RA and RB are eliminated However in some cases for example when using the high resistance range 2000 ohms the four wires method is not necessary to still have a good percentage of accuracy compared to the full scale The simplified method of two wires can be used without too much problems C1 and
9. circuits not directly connected to mains Due to our policy of constant improvement and development we reserve the right to change specifications without notice In this direction will find a vision of the measurement technique http www industrial needs com measuring instruments htm NOTE This instrument doesn t have ATEX protection so it should not be used in potentially explosive atmospheres powder flammable gases 13
10. e holding the font panel Two os these screws are located under the foots and the two others are located inside the battery compartment The fuse is automatically blow by the crowbar should voltage be present on the resistance under test This is to prevent damage to the instrument It is indicative of this fuse being blown is the RC Led stays on HBC 1A 250Vac Slow Blow e Potential Circuit Fuse Fuse protection is provided on the potential terminals This fuse is situated under the Printed Circuit Board To access it you need to unscrew the four mounting screws which are holding the font panel Two os these screws are located under the foots and the two others are located inside the battery compartment The fuse is automatically blow by the crowbar should voltage be present on the resistance under test This is to prevent damage to the instrument If the preliminary tests does not lit R P this is indicative of this fuse being blown HBC 0 5A 250Vac Slow Blow INPUT LIMITS amp PROTECTIONS The maximum continuous voltage which can be applied across the potential and current leads is around 10 7V Applying more than that voltage will automatically blow their respective fuses However the crowbar trigger can be factory adjusted for your application We have specially selected that method to stop damaging the instrument should it be misused 10 info tursdaletechnicalservices co uk SPECIFICATIONS ELECTRICAL
11. from P1 and P2and C1 and C2 Touching the potential test leads P1 to C1 and P2 to C2 the RP led should lit indicating an over voltage or over range This proving test can be repeated on all the ranges if need be You can also check the polarity indication of the milli voltmeter by touching the potential test leads P1 to C2 and P2 to C1 the RP led should lit indicating an over voltage or over range The indicator should be indicating on the LCD showing the polarity change Total check can be done by shorting all the test leads together C1 C2 P1 P2 The display should indicate close to 0000 depending of the crocodiles clips used and how they are shorted Both RC and RP LED should be OFF indicating that everything work ok PRECAUTIONS e Always ensure that the circuit to be measured is switched OFF isolated and completely de energised before connecting the test Leads e If it is probable that the instrument s protection has been impaired due to electrical mechanical or environmental damage it must not be used It should be returned to your nearest distributor or agent for checking and repair e To prevent damage to the liquid crystal display the minimum storage temperature of 20 C must be observed It should also be noted that below 0 C the operation of the LCD will be sluggish e If the exterior of the instrument requires cleaning it should be done with a sponge and a mild solution of detergent and water e Other mechani
12. mm shrouded color coded sockets THERMAL EFFECTS Temperature can have a significant effect on the performance of a digital milli ohmmeter due to the temperature coefficient of the resistance under test and thermal EMF s across the dissimilar conductors Most conductors have a large temperature coefficient of resistance For example 0 4 C for copper A copper conductor that has a resistance of 10 00m ohm at 20 C will increase to 10 40m ohm at 30 C This change should be taken into account when making measurements A current going through a resistance will also elevate its temperature So duration of the test can change the resistance When measuring the resistance of item such as current shunts which have joints of dissimilar conductors thermal EMF can affect the accuracy of the measurement This condition can be detected if the reading alters when the leads are reversed To compensate for this effect the average of the two readings should be taken as the true measurement info tursdaletechnicalservices co uk FUSES REPLACEMENT There are three fuses e Power Supply Fuse The power supply fuse is situated under the tester Open the battery compartment and replace the fuse with the same type 1 5A gt 24V Slow Blow e Current Circuit Fuse Fuse protection is provided on the current terminals This fuse is situated under the Printed Circuit Board To access it you need to unscrew the four mounting screws which ar
13. olarity condition of load or automatic decimal point change The ranges are selected by a 5 position rotary switch and a test is initiated by pressing the ON push button The instrument takes measurements for 10 seconds if the ON TEST re preventative button is depressed for less than 2 seconds If the same push button is pressed for more than 3 seconds the test will carry on for 60 seconds The tester switch OFF completely when the rotary switch is in the OFF position The tester Hold the last reading before stopping the test The tester is fuse protected and has a crowbar between C1 and C2 This crowbar is activated by voltage If the voltage is too high that crowbar will blow the fuse automatically to interrupt the circuit info tursdaletechnicalservices co uk The voltage between P1 and P2 is also protected for over voltage but does not have a fuse The tester has a temperature shut down The temperature sensing is done on the current regulation transistor Should this over temperature let lit allow the instrument to cool down for a while before proceeding further FRONT PANEL LAYOUT If NO TEST LED lit the current source is stopped 2 Over Temperature indicator Lit Over temperature or test O Stopped o Resistance between the current leads too high fuse Resistance between the potential leads too high Current Injection Terminals Potential Injection SAN a Ba a
14. tice The following rules should reduce the danger Read the User s manual carefully and completely before using the instrument Fully understand the instructions before using this product Follow the instructions for every test Take all the necessary precautions Do not exceed the limits of this instrument e The circuit to be tested must be de energised and isolated before connections are made to it e Do not use test leads probes or crocodiles aligators clips that are dirty damaged or have broken or cracked insulation Such accessories should be removed and repaired Immediately e Always disconnect the test leads before replacing any fuse Always replace the fuse with the type specified and ensure that they are correctly fitted e Double check the switch settings and leads connections before measuring Make a sketch to ensure proper operation and principle of measurement is correct and well understood e Do not touch any exposed wiring connections or other live parts of an electrical circuit If in doubt check the circuit first for voltage before touching it e This instrument should only be used by a competent suitably trained person which understand fully this test amp measurement procedure Warning risk of electric shock N Caution refer to this manual before using the Meter info tursdaletechnicalservices co uk GENERAL DESCRIPTION The meter digital milli ohmmeter is a battery operated instrument
15. wich supply a low current to the circuit under test with which stable accurate measurement of low resistance can be made still over a wide range of values Resolution on the lowest range is 100 ohm and on the highest range 1 ohm The meter has 5 measuring ranges from 200 0milli ohm to 2000 ohms Measurements are displayed on a 3 digit custom liquid crystal display with large digits This instrument is powered from batteries only alkaline or rechargeable equivalent It has a regulated DC constant current source with current of 1mA 10mA and 100mA The instrument supply that current to the resistance being measured through the C1 and C2 terminals C1 being C2 being The voltage drop across the resistance under test is measured by the potential terminals P1 and P2 P1 being P2 being Should the current regulation drops out the RC Led will lit indicating that the resistance in the current circuit is too high Lowering the current by selecting a higher resistance range can solve the regulation Should the RP Led lit that mean that the voltage measured on the resistance is too high and therefore over range The resistance is measured precisely when the RP and RC Leds do not lit If anyone of these leds lit then the measurement can be inaccurate The meter has a built in custom 3 digit liquid crystal display can be viewed in most lightning conditions This display indicates the differences conditions Hold m buzzer p
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