CM300 CM400 CM500 User Guide - RS Components International
Contents
1. 00 400 amp 500 Multi Function Installation Testers MEGGER IEC EN 61557 User Guide WITA Contents Safety Warnings Initial Setup General Description Features Controls and Connections Operation Backlight Auto shut off Switched probe SP2 Checking Earth Potential Voltage and Frequency Measurement Polarity Indication Determining Phase Sequence Continuity Testing and Low Resistance measurement Test Lead Resistance Nulling Low Resistance Continuity measurement Continuity Bleeper Low input resistance voltmeter 500 only 5Q Threshold 500 only Insulation Testing and High Resistance measurement Loop Impedance Measurement Bonded Metalwork Testing Prospective Short Circuit Current PSCC PFC measurement accuracy Earth Loop measurement at 15 mA 500 only 3 4 6 8 10 10 10 10 10 10 11 12 12 12 13 13 13 13 14 15 16 17 17 17 RCD Testing 19 No Trip Tests 20 Trip Tests 20 Auto Sequence RCD Test 22 Connecting to the supply 24 Earth Resistance Measurement 25 Earth Electrode Resistance Measurement 25 Condition and Warning Indication 28 Test Results Storage Deletion and Retrieval 29 Serial Cable Connections 31 Specification 32 Accessories 36 Publications 37 Basic and Service Error calculation 38 Repair and Warranty 40 Symbols used on the instrument A Caution Refer to accompanying notes Equipment protected throughout by2. J nomi supply 92 646 56 Q 6 Open Circuit Setting A and and Setting b Determining Phase Sequence When connected to all conductors of a three phase system the CM500 automatically displays the sequence of phase rotation Connect the 500 as follows Line 1 Red phase Red lead Line 2 Yellow phase Green lead Line 3 Blue phase Black lead If connected as above the symbol is displayed when the sequence is 1 2 3 or Red Yellow Blue The symbol is displayed when the sequence is 1 3 2 or Red Blue Yellow If one of the lines is faulty neither of the symbols is displayed and the normal neon polarity indication is shown To measure the phase to phase voltages the following switch positions are used 12 Switch position Voltage Shown MQ L PE Red and Green Leads Vi 2 MQ L N Red and Black leads Black and Green leads V2 3 Continuity Testing Low Resistance and kQ Measurement CM500 will measure low resistance from 0 01Q to 99 90 and will automatically change range to up to 99 9 KQ using the 2 wire lead set Up to 10 Q of test lead resistance may be subtracted using the test lead resistance nulling range Measurement is displayed on the large digital display and the analogue scale from 0 Q to 20 Q or 01020 In Setting A automatic polarity reversal is carried ou
3. Double or reinforced Insulation Class Equipment complies with current EU Directives 61557 Complies with IEC EN 61557 SAFETY WARNINGS Safety Warnings and Precautions must be read and understood before the instrument is used They must be observed during use The circuit under test must be switched off de energised and isolated before test connections are made when carrying out insulation and continuity tests Continuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out an earth fault loop impedance test or RCD test Circuit connections and exposed metalwork of an installation or equipment under test must not be touched Do not move the rotary selector switch position while a test is in progress The LCD neon voltage indicators cannot reveal a Neutral Earth reversal After insulation tests capacitive circuits must be allowed to discharge before disconnecting test leads The instrument should not be used if any part of it is damaged Test leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation U K Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems Replacement fuses must be of the correct type and rating NOTE THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Initial Setup
4. Read this page before using the instrument 3 Toggle the I key to scroll through and display the current Your Multi function Installation Tester has been set up as shown setup modes as follows on the label on the front of this User Guide Code Item Meaning A Delay after each line The first line gives the setting which modifies the way the Pri ter speed Change from 0 0 to instrument behaves 10 0 seconds Setting A Europe Setting b UK Language 1 is English 2 reversing current Single measurement L r Language 2 can be Continuity tests measurements are made Printer report language changed using the made Installation Tester Line and Neutral swap Setup disk supplied Line and Neutral swap RCD Loop and Earth tests allowed not allowed Described in detail Auto RCD does test Auto RCD does opposite Setting A is 150 mA test Setting for Continental Europe Setting b is for the U K After trip test contact After trip test trip time RCD tests voltage displayed first or To change the Printer speed 2s 41 No Trip test not 2s XI No Trip test 1 Toggle the I key to scroll through and display the Pde performed performed code The second line gives the printer report language This may be 2 Press the SAVE key The current speed setting is Language 1 which is English or Language 2 which is the displayed language noted on the third line of the label
5. Saving Results bleep will be heard For a Continuity MQ L N or Loop After a test the result is displayed on the screen and this may be L N test a code as given in the following table is saved with additional information A circuit number 1 99 may displayed This code is used to describe the circuit tested be assigned and when moving site or building circuits may be and can accordingly be modified by the user For all other grouped using the distribution board feature In this way when tests a circuit number code is displayed and you should downloading to PowerSuite the results can be easily split proceed directly to step 4 into different test schedules When the results are displayed or printed a change in the distribution board is indicated Test to be saved Display code Meaning Changing Distribution Boards DB Resistance of Line R1 aoe a test the distribution board number may be changed as Resistance of PE R2 ollows Resistance of circuit R1 R2 1 Move the rotary selector switch to the RCL position The Continuity Resistance of Line ring code rcl is displayed 2 Press the SAVE key The currently selected DB code is Resistance of PEring tance of PE rin displayed e g 401 ree esista ring 3 This number be changed using the RCL 2 keys to Resistance of display the required number Insulation 4 The number can be accepted by pressing the SAVE key Loop L
6. V I The measurement depends on the position of the probe The probe must be positioned away from any part of the installation under test so that it provides a valid reference earth For a single earth electrode the distance of 20 m is found to be sufficient Be careful of secondary earth paths such as service pipes The best way to confirm the measurement is to try two probe positions Condition and Warning Indication Display H Any hardware or software faults and errors will cause the ardware or software Switch Off then On 7 ae together with an identifying 2 digit number EOW Low Battery LowBattery Battery vottage too ow Replace battery kanen If such an error number is displayed switch the instrument Off Touch Pad Earth voltage too high installation or and back On again Then repeat the test that was originally 100 V wiring to the instrument being carried out or as given in the following table Supply voltage and gt lt _ Supply voltage or freq If the error number is again displayed switch the instrument to Freq out of range and too high or low for test Off and return the instrument to the manufacturer for service together with a description of the events leading to the Too rapid testing with Aa Thermal Trip no pauses for Pause between tests to message display See Returning an instrument for Repair
7. 738 Loop L L L N L L L N E N Loop L PE Re L PE Continuity FQ Loop Resistance Insulation No Display Polarity Indication If connected to a single phase power supply by a plug or by the 3 wire lead set three LCD neons marked L PE N PE and L N respectively will indicate supply polarity If a voltage is detected between their respective two wires the 6 will activate neon will usually flash if one connection is open circuit Note The presence of a voltage between phase and earth does not prove earth continuity as the earth could have a high resistance and a voltage would still be measured To test earth continuity refer to the sections on loop resistance or RCD testing If Setting A is set the CM500 will automatically switch Line and Neutral as appropriate when in any of LOOP Re earth or RCD test functions This enables a test to be performed without inverting the plug connections The live terminal of the wall socket is identified by the addition of a separate symbol adjacent to the neons The Phase Neutral reversal and symbol display does not occur in Setting A Insulation and Continuity ranges and does not occur in Setting b J Normat supy ro 6 60 Setting LOOP Re earth RCD 11 Operation Contd L PE N PE L
8. Operated heat dissipati i ee allow cooling Error Number Appropriate Action si RCD Tipped Confirm ROD rating EEPROM failure Stored data is u interrupte and check for excess earth leakage current lost Attempt to delete the stored test results and then store Excessive external Identify and rectify supply noise during or wait and re test another result If Error Number earth loop or RCD test 23 persists return the instrument for Auxiliary sone Rectify re position service R too high Incorrect connection auxiliary spike 2 Loop LE LN or LL Secondary internal thermal cut out is open tanding V on probe ircuit i Earth test Spike Standing V b Rectify or re position circuit Return the instrument fo Voltage too high too high prior to test auxiliary spike Ese service Re May be due to incorrectl Spike connected As required ik y Auxiliary Spike positioned spike Replace fuse Fuse external in V and Earth Loop or RCD Possibly Be eee due to excessive noise on the Memory full FUN Results memory full Down oad results ang supply or the RCD unexpectedly clear memory trips together with internal Memory bap Results memory Press fault If Error number persists Corrupted unintelligible attempt recovery return the instrument for service 27 Test Result Storage Deletion and Retrieval
9. 3 Toggle the RCL 2 keys until the required speed setting is Instrument Setup displayed The instrument setup mode allows you to change the setting the 4 K To save the new setting press the SAVE key The bleeper printer speed and the printer report language sounds Pdtis displayed To abort the new setting press To display the current setup modes the EXIT key relis displayed 1 Press and hold the Backlight lt key then turn the rotary To select the Printer language selector switch from the from OFF position to the RCL 1 Toggle the I key to scroll through and display the 79 position The code Pdt printer speed is displayed code 2 Release the Backlight gt key 2 Press the SAVE key The current printer report language is displayed as 1 English or 2 as given on the type label on the previous page Note Language 2 can be changed using the Installation Tester Setup Disk supplied 3 Toggle the I key until the required language setting is displayed 4 To save the new setting press the SAVE key The bleeper sounds and 78 is displayed To abort the new setting press the EXIT key rel is displayed To select the Setting 1 Toggle the I key to scroll through and display the SEE code 2 Press the SAVE key The current setting is displayed as A Continental Europe or b U K 3 Toggle the I key until the required setting is displayed 4 save the new setting press the
10. Connect the leads across the isolated circuit Select MQ L N 4 Press either the I or the TYPE key to display the test voltage Press again until the required test voltage is displayed 5 Press and hold the TEST key 6 Circuit resistance value is displayed 7 Release the TEST key but maintain connection to allow the test voltage to discharge When using the 2 wire lead set to measure insulation always select MQ L N The insulation will be measured between the two leads 14 3 wire lead set method Use of a 3 wire lead set enables all combinations of insulation to be tested without changing lead connections 1 Disconnect Phase Neutral and Earth from the distribution board 2 Connect the red lead to Phase the black lead to Neutral and the green lead to Earth ground 3 Select MQ L PE L N or N PE as required 4 Press either the I or the TYPE key to display the test voltage Press again until the required test voltage is displayed 5 Press and hold the TEST key Circuit resistance value is displayed 7 Release the TEST button but maintain connection to allow the test voltage to discharge Power plug method The insulation resistance of an installation may be tested by using the plug terminated test lead at a convenient socket outlet However a The installation must be isolated from the supply b The insulation test will incorporate the immediate circuit and any other circuit conne
11. SAVE key The bleeper sounds and 5 is displayed To abort the new setting press the EXIT key is displayed Installation Tester Setup Disk The program on the disk enables the second printer language to be changed into any of the separate languages The program may be run directly from disk Connect the PC to the instrument via a serial lead for DOS type 5005 and press Return for Windows 3 1 or 3 11 1 From the Program Manager options select 2 From the options given select 3 Type a cm500set and press For Windows 95 1 Select the Start menu 2 Select the Run option 3 a cm500set and press Follow the instructions given by the program File Run Return Return General Description MEGGER Multi function Installation Testers are compact instruments designed to perform all of the functions required by the electrical contractor to fully test domestic commercial and industrial wiring Specially designed to comply with U K European and other International wiring regulations and standards the Installation Testers may be used on all single and three phase systems with rated voltages up to 300 Volts a c rms to earth ground Measured values are indicated on a large backlit analogue digital LCD and may also be stored in internal memory for later recall to the display direct printing via a standard serial printer or downloaded to a PC for storage analysis and repo
12. loop earth resistance available by pressing the DISPLAY key The trip current value and the trip resistance value 500 only are displayed with both the 0 and the 180 symbols The Trip resistance is the fault required to trip the RCD Auto Sequence RCD Test If the RCD is not located near a convenient installation socket it could mean walking back and forward between the RCD and the instrument to reset the RCD each time it trips out To simplify and speed up sequence testing the instrument can be set to automatically perform each subsequent test in the sequence each time that the power is restored This test depends upon whether Setting A or Setting b is selected The Overcurrent or Fast Trip is 150 mA if Setting b is selected and 5 x I if Setting A is selected The display shows 150 mA or 5I symbols as appropriate The test procedure is as follows 1 Connect to the supply as detailed on the next page 2 Select the RCD rated current the rotary switch 3 Select Auto RCD test sequence by pressing the I key until the 0 180 and Fast trip symbols are all displayed together Auto test is only applicable to a c sensitive non delayed RCDs therefore Type segments are not displayed Press and release the TEST button Reset the RCD within 30 seconds after each trip test 6 Tests will be carried out in the sequence 0 180 Fast Trip 0 and 180 After each trip test the instrument will wait for
13. phase phase loop resistance can be measured The instrument takes a current from the supply and measures the difference between the unloaded and loaded supply voltages From this difference it is possible to measure the loop resistance The test current will vary from 15 mA to 40 A depending on supply voltage and the loop resistance value The test duration will depend on the loop resistance value Possible sources of error The reading depends on a measurement of the supply voltage and therefore noise or transients caused by other equipment during the test could cause an error in the reading One way to check for these is to do two tests and look for any difference in value The instrument will detect some sources of noise and warn the user where other instruments may give an incorrect reading Any leakage current as a consequence of other appliances connected to the supply under test may affect the reading If the Phase Earth loop is being measured this leakage may be due to filter capacitors etc 18 RCD Testing The Installation Testers can test the operation of a variety of types of Residual Current Devices RCD measure the phase to earth loop resistance and the contact voltage of the installation Using an earth test spike the earth resistance and fault voltage may be measured If Setting A is selected when using the plug terminated lead set the polarity of the mains socket is immaterial Line and Neutral will be swapped if nece
14. power from the PC or printer This is fine for most desktop PCs and laptops but manufacturers are working to improve the battery life and the RS232 interface on some products has been re designed for low power Low voltage and high impedance outputs are possible The Installation Tester requires a modest 5 5 V at 6 mA and most of this power is fed back into the PC or printer via the Tx Transmit line This is expected at DTR or RTS and if this is not available an additional supply of 5 5 20 V with a current capability of at least 6 mA is required This should be connected between GND pin 5 and pin 6 on the the instrument in place of any other connection to pin 6 31 Specification SUPPLY VOLTAGE MEASUREMENT 25 500 V Intrinsic accuracy 2 2 digits SUPPLY FREQUENCY MEASUREMENT d c 16 460 Hz Intrinsic accuracy 0 1 1 digit INSULATION RANGES to EN 61557 2 250 V 500 V 1 kV into 1 mA load 1 to 499 MQ at 1 kV 2 2 digits EN61557 Operating Range 0 10 MQ to 99 9 MQ Nominal Test Voltages Displayed Range Intrinsic accuracy CONTINUITY RANGE to EN 61557 4 Displayed Range CM500 0 01 to 99 9 CM300 amp CM400 0 01 Q to 99 9 2 2 2 digits Open Circuit Voltage 4V 5V Test Current 0 2Q 200 mA 250 mA EN61557 Operating Range 0 10 Q to 99 9 Intrinsic accuracy LOOP AND EARTH ELECTRODE RESISTANCE MEASUREMENT to EN 61557 3 and EN 61557 5 LINE E
15. the display Setting b requires Line and Neutral to be fixed 1 Insert the power plug into an installation socket 2 Select and set the rated current RCD type and the test type 3 Supply voltage configuration symbols and polarity are displayed 4 Press the TEST key 5 See previous notes for Type of test If desired the test can be repeated by pressing TEST again 24 2 wire lead set method If an installation socket is not available use the 2 wire lead set 1 Connect the red lead to phase and the black lead to earth No connection to neutral is made 2 Select and set the rated current RCD type and the test type 3 Supply voltage and polarity are displayed prior to the test Note Though displayed polarity indication with the 2 wire lead set is invalid and should be ignored 4 Press the TEST key 5 See previous notes for Type of test If desired the test can be repeated by pressing TEST key again Earth Resistance Measurement The Installation Tester can rapidly measure the earth electrode resistance and earth resistance from 0 01 to 3 00 kQ of a TT installation using the earth test spike and the plug terminated test lead or at any other convenient point on the installation using the 2 wire lead set If Setting A is selected when using the plug terminated lead set the polarity of the mains socket is immaterial Line and Neutral will be swapped if necessary and an indication given on the display Se
16. 01 Q up to 3 00 can be made via installation sockets using the plug terminated test lead or at any other convenient point on the installation using the two wire lead set If Setting A is selected when using the plug terminated lead set the polarity of the mains socket is immaterial Line and Neutral will be swapped if necessary and an indication given on the display Setting b requires Line and Neutral to be fixed Test results may be adversely affected by supply voltage fluctuations or electrical noise during measurement It is recommended that tests are repeated and the results verified if measurement results are considered abnormal The Installation Testers will measure the loop resistance from the supply end of the standard test leads allowing for their resistance 15 Operation contd Automatic testing To aid rapid testing the instruments can be set to start a test automatically when connected to the supply This may be of use for example when using a clip and a probe Select the range required and press the test key without the supply present The instrument will display lt 100 V for approximately 30 seconds Apply the supply voltage within this time and the instrument will automatically pause before performing test Phase to Neutral or Earth loop impedance measurement Power plug method Select Loop L PE or L N as required 2 Insert the plug into an installation socket 3 Supply
17. 1000 mA 500 only Selectable Ranges Test Facilities Fault or contact voltage tests at Loop and Earth resistance tests at No Trip tests at Trip tests at I An Fast Trip test at 150 mA Ramp tests RCD Types General purpose delayed Selective and d c Sensitive 230 V 50 Hz 100 280 V 45 65 Hz Note The maximum possible test current including the 51 multiplier is 1000 mA for d c sensitive RCDs These limits are halved if the supply voltage is less than 200 V Nominal Supply Supply Range LEST FAULT OR CONTACT VOLTAGE Displayed range 0 V to 90 V Measurement range 5 V to 90 V LOOP AND EARTH RESISTANCE measured at DISPLAY RANGE OPERATING RANGE As in EN 61557 0 01 to 9 0 5 KQ to 9 1Qto3kQ 170 Q to 3 1 Q to 900 Q 500 to 900 Q 0 1 Q to 300 Q 170 to 300 Q 0 1 Q to 180 Q 100 to 180 Q 0 1 Q to 90 Q 5Q to 90 Q 2 SECOND NO TRIP TEST at optional The test current flows for 2 seconds A tripped RCD will result in a display of lt 1999 ms Intrinsic Test Current accuracy 8 2 33 Specification contd TRIP TESTS Tan Trip Test This test will perform a short automatic test followed by a 30 second delay Selective type only then execute a Trip test General purpose Test test for up to 300 ms Selective Test Ian test for up to 2000 ms Note 30 second delay be
18. ARTH amp EARTH ELECTRODE 0 01 Q to 3 00 230 V 50 Hz Displayed Range Nominal Supply 32 Supply Voltage Range 100 280 V 45 65 Hz EN61557 Operating Range 0 25 Q to 3 00 Intrinsic accuracy 0 01 Q 9 99 Q 4 0 030 10 0 Q 89 9 Q 5 0 50 5 200 900 Q 3 00 LINE LINE Phase Phase LOOP RESISTANCE MEASUREMENT to EN 61557 3 Displayed Range 0 01 Q to 19 99 Q 5 0 03 Q 230 50 2 Supply Voltage Range 100 480 V 45 65 Hz EN61557 Operating Range 0 25 Q to 19 99 Q Intrinsic accuracy Nominal Supply PROSPECTIVE FAULT CURRENT Prospective fault current Nominal voltage Loop resistance Measured Voltage Nominal Voltage gt 150 V 110 V 150 V 300 V 230 V gt 300 V 400 V Prospective Fault Current is calculated from the respective loop resistance Ranges and accuracies are therefore derived from the previous section LINE EARTH LOOP RESISTANCE MEASUREMENT AT 15 mA to EN 61557 2 CM500 only 0 1 Q to 2 00 up to 200 Q 3 0 3 Q over 200 5 5 1 of reading within 0 3 Q ona normal domestic supply 230 V 50 Hz Supply Voltage Range 100 280 V 45 65 Hz EN61557 Operating Range 5 0 Q to 2 00 kQ Displayed Range Intrinsic accuracy Noise Immunity Nominal Supply RCD TESTING to EN61557 6 up to 500 mA 10 mA CM300 amp CM400 only 30 mA 100 mA 300 mA 500 mA 1000 mA Variable 10 mA to
19. L or the procedure aborted by pressing the EXIT TA 5 When the number is saved the code Std is displayed accompanied by a long bleep to confirm that the data has Insulation only ome O O NE been saved Testing may now continue with all subsequent results associated 2 code may be changed by pressing the RCL 2 keys with the new distribution board number 3 The code may be accepted by pressing the SAVE key or Saving a result aborted by pressing the EXIT key On completion and display of the measurement 4 circuit number is displayed as 2 digits e g 01 1 Press and hold the SAVE key After about 1 second a Note Many different tests may be saved under the same circuit number 28 5 The circuit number may be changed by pressing the RCL 2 keys to display an appropriate number Hold the key down to step through the circuit numbers 6 The number can be accepted and the results saved by pressing the SAVE key or the procedure aborted by pressing the EXIT key 7 When the result is saved the code Std is displayed accompanied by a long bleep to confirm that the data has been saved The display of FU indicates that there is no more test storage Delete all data 1 Move the rotary selector switch to the RCL position The code rcl is displayed 2 Press the RCL 2 keys together The code dEL is displayed 3 Confirm that the data is no longer required by pressing the SAVE key or abort by
20. ains supply is also required to carry out RCD Loop and Earth tests FUSES 500mA 500V HBC 10 2 x 7A SIBA 70 065 63 The 500 mA fuse is accessible from the battery compartment and protects the Insulation and Continuity circuits The 7 A fuses Replaceable Non replaceable protect the instrument and not replaceable by the user Ruptured fuses are indicated by the display of the 3 symbol when a test is attempted SAFETY Meets the requirements for double insulation to 1010 1 1995 EN61010 1 1995 Installation Category up to 230 V to earth and 400 Volts phase to phase without the need for separately fused test leads If required fused test leads are available as an optional accessory Complies with the relevant parts of EN 61557 1997 02 as detailed below Relates to the transient overvoltages likely to be met in fixed wiring installations E M C Meets EN50081 1 and EN50082 1 1992 ENVIRONMENTAL PROTECTION IP40 The instrument is designed for indoor use or outdoor use if suitably protected TEMPERATURE RANGE Operating 5 C to 40 C up to 90 RH Storage 25 C to 65 C up to 90 RH GENERAL Dimensions 245 mm x 200 mm x 95 mm Weight 1 35 kg with battery Cleaning Wipe the disconnected instrument with a clean cloth dampened with soapy water or Isopropyl Alcohol IPA IEC 61557 EN 61557 Complies with the following parts of EN 61557 Electrical safety in low volta
21. alue is displayed Note Though displayed polarity indications are invalid using the 2 wire test lead set and should be ignored 11 Disconnect the red and black leads Switch off the instrument 12 Firmly re connect the earth electrode 13 Carry out a continuity test between the PE conductor and the earth electrode and confirm that a valid connection has been made 14 Switch on the supply 15 Carry out a loop resistance test Method of measurement The earth resistance is measured by taking a current from the supply and injecting it into the resistance to be measured The voltage change across the earth resistance is measured by the use of a remote probe 20 30 m away from any earth electrodes 26 The test current will vary from 15 mA to 25 A depending on supply voltage and the loop resistance value The test duration will depend on the loop resistance value Possible sources of error As with the loop resistance measurements the reading depends on a measurement of the supply voltage and therefore noise or transients caused by other equipment during the test could cause an error in the reading One way to check for these is to do two tests and look for any difference in value The instrument will detect some sources of noise and warn the user where some instruments may have given an incorrect reading Source Resistance Earthed Supply S Probe Connection We know and measure V Re
22. and Frequency Measurement The Installation Testers will display the supply voltage and frequency all switch positions except RCL and OFF The DISPLAY key will alternate between voltage and frequency Power plug connection Insert the power cord plug into an installation socket 2 Supply voltage and polarity are displayed 3 Press DISPLAY to alternate between supply voltage and frequency 2 wire lead set connection If an installation socket is not available use the 2 wire lead set 1 Connect the red and black leads to the two conductors to be tested 2 Voltage between the leads and polarity are displayed Note Though displayed when using the 2 wire test set neon indication is invalid and should be ignored 3 Press DISPLAY to alternate between supply voltage and frequency 3 wire lead set connection If an installation socket is not available and it is necessary to connect to all three conductors use the 3 wire lead set 1 single phase system connect the red lead to phase the black to neutral and the green to earth 2 Supply voltage and polarity are displayed 3 Press DISPLAY to alternate between supply voltage and frequency Note For connection to a three phase system see Determining Phase Sequence When connected the instrument will display the supply voltage indicated in the following table Mode switch positon votage Display RCD Tests all Currents RCD
23. cates including Periodic Inspection Minor works and Electrical Installation The Installation Tester Setup disk supplied with the instrument also contains the cmdld program This enables stored results to be downloaded the creation of simple test reports and to import data into PowerSuite at a later time To use the disk program 1 Connect the instrument to the PC by serial lead 2 Copy the file onto the PC hard disk 3 Run the program and follow the on screen instructions To a PC for downloading data Normally a 9 way D female socket to a 9 way D female socket lead suitable for connecting PC to PC is required This lead should not exceed 3 m in length A lead is available as an accessory or one can be made up as follows Tester 25 way D If making up a 9 Way D lead it may be convenient to connect pin 4 to pin 6 enabling the lead to be used either way round To a Serial Printer for printing reports Normally a 9 way D female socket to a 25 way D female socket lead suitable for connecting PC to Printer is required This lead should not exceed 3 m in length A lead is available as an optional accessory one can be made up as follows Installation Printer Tester 25 way D Tm 2 2 Signal 8 printer should be set to 9600 baud 8 bits data no parity 1 stop bit The instrument uses an isolated serial interface and takes
24. cted on the load side of the distribution board D B If a low reading is obtained each circuit must be individually tested from the distribution board to locate the fault 1 Disconnect Phase Neutral and Earth from the 2 Insert the power plug into an installation socket on the isolated circuit to be tested 3 Select MQ L PE L N or N PE as required 4 Press either the I or the TYPE key to display the test voltage Press again until the required test voltage is displayed 5 Press and hold the TEST key Circuit resistance value is displayed 7 Release the TEST button but maintain connection to allow the test voltage to discharge 1200 V 1000 800 a p esistance MQ Insulation Test Voltage Method of measurement A current limited d c source is used and the resistance is calculated from measurements of the voltage and current The polarity of this d c source is as follows Range ve terminal ve terminal L N Neutral Black Phase Red N E Neutral Earth L E Phase Red Earth Black The voltage is only present when the test button is pressed A measurement of the terminal voltage is made before the test and if this exceeds about 25 V the test is disabled If d c voltage is detected across any of the terminals a discharge resistor is connected across it The reading is stable with a circuit capacitance less than 5 uF Loop Impedance measurement Loop impedance measurement of 0
25. ed operating current of the RCD is drawn for 2 seconds Tripping of the RCD will indicate that it is over sensitive or that excessive earth leakage current is being drawn in the system The load put onto the circuit is resistive and therefore the test current is sinusoidal if the supply is sinusoidal No Trip testing The test is the same for all RCD types Select the Rated Current the RCD and Connect to the installation and press the TEST key If the settings are correct and the RCD is in order the RCD trip should not operate and the Contact or Fault voltage will be displayed If the RCD trip does operate during the test the message is displayed This could be due to incorrect current rating selection excessive leakage current in the circuit or a faulty RCD If the problem is excessive leakage current the source of the problem must be located and rectified before a trip test is performed otherwise the result of the trip test will be invalid Earth or loop resistance can be shown by pressing the DISPLAY key Trip Tests The instrument will measure the trip time or trip current of common selective time delayed and d c sensitive RCDs The trip time is measured by timing the period from the application of a resistive load to when the supply fails Some RCDs are sensitive to the polarity of the supply i e whether the test current is applied with the instantaneous rising or falling Tests should therefore be perfo
26. f the correct size and rating Relocate the fuse holder depress and turn a quarter turn clockwise Replace and re secure the cover Battery Replacement When the low battery symbol appears the cells are nearly exhausted and should be replaced as soon as possible When the battery is exhausted the instrument will not perform tests and the cells must be replaced Use alkaline cells IEC LR6 AA or 1 5 V nickel cadmium cells only To install or replace the cells disconnect the test leads switch the instrument Off and loosen the captive screw holding the battery compartment cover in place Remove the cover lift out and disconnect the battery holder to access the cells Replace the cells ensuring that correct polarity is observed shown on battery holder moulding Incorrect battery cell polarity can cause electrolyte leakage resulting in damage to the instrument Carefully re connect the battery holder to the plug replace the battery holder in the compartment and re secure the cover Remove the cells if the instrument is not going to be used for any extended period of time Stored results are retained when the battery is disconnected Test Leads All test leads form part of the measuring circuit of the instrument and must not be modified or changed in any way or be used with any other electrical instrument or appliance The power cord supplied with the Installation Testers is a test lead that forms part of the measurin
27. g circuit of the instrument The overall length of this lead must not be altered If the power cord plug is not suitable for your type of socket outlets do not use an adaptor You may change the plug once only by cutting the cord as close to the plug as possible and fitting a suitable plug The colour code of the cord is Earth Ground Neutral Phase Line Note A plug severed from the power cord must be destroyed as a plug with bare conductors is hazardous in a live socket outlet Yellow Green Blue Brown 7 Features Controls and Connections Press I and TYPE key to Select test parameters e Enter test result identification Press TYPE key to Select test voltage MQ e Select type of RCD Delete data in combination with I key Push TEST button to Initiate the selected test Repeat selected test Touch finger to Earth Test Pad to Check potential between the Earth connection and your finger RCD Testing 150mA 40ms test selection VARiable selection CM500 only 10 mA test selection CM300 amp CM400 Loop test selection CM500 Auto Shut off Operates after 5 minutes of inactivity by the instrument gt 30 seconds in Bleeper es Press key to Display other test results Press and hold key to e Save test results a PLA Backlight key OFF position Recall Download position Continuity test position Lead resistance
28. ge systems up to 1000 V and 1500 V Equipment for testing measuring or monitoring of protective measures Part 1 General requirements Part 2 Insulation resistance Part Loop resistance Part4 Resistance of earth connection and equipotential bonding Continuity testing Part5 Resistance to earth Part6 Residual current devices RCDs 35 36 Test and carry case Pouch Carrying strap 2 wire Test lead set 3 wire test lead U K Mains plug test lead Euro Mains plug test lead U K Earth bond test lead Switch Probe SP2 2 wire test lead set 5m Fused probe and clip set 2 probes and 3 clips Computer Serial lead Printer serial lead 3 inch diskette Earth test spike 30 m of test lead on winder AVO PowerSuite Accessories Holds and supports the instrument to allow hands free operation in use and protection when not in use Holds and protects the instrument when not in use Attaches to case or instrument With prods and clips For three phase sequence testing including 2 prods and 3 clips Fitted with BS1363 fused plug Fitted with CEE7 7 plug Fitted with BS1363 fused plug 2 wire lead set with a Test key in the black probe 2 wire lead set with 5m long leads Replace normal probes and clips supplied with 2 and 3 wire test test lead kits 600 V max 10A fuse To connect the instrument to PC with 9 way D connector 1 8 m long To connect the instrume
29. iven on the RCD to be tested select and set the type of RCD Symbol Genea Selective delayed D C Sensitive relays Some RCDs are electromechanical devices which can be saturated by the presence of d c Therefore if a d c fault occurs or an a c fault occurs in the presence of quite a small direct current the RCD may not trip In this way the RCD is disabled and this becomes a potential hazard Because of this d c sensitive RCDs are available Operation contd Selective or Time delayed RCDs In some cases it may be necessary to have an RCD protecting an individual circuit or group of circuits If a fault occurs the RCD nearest to the fault should trip to clear it maintaining supplies to the other circuits Selective RCDs normal symbol s are used to discriminate faults occurring on separate circuits and these have a minimum as well as a maximum trip time Type of test Performs a no trip test at half the rated current of the selected RCD The test measures the earth loop resistance and contact voltage or with a test spike the earth resistance and fault voltage Trip test at the rated current of the selected RCD test is carried out before this and the resistance and voltage are available after the Trip Test test The test is always started on a zero crossing when the instantaneous voltage is on the rise above but the test is always T
30. lect Loop L PE Supply voltage is displayed Press the TEST key Measured resistance value is displayed OF OV 69 Prospective Short Circuit Current measurement PSCC The PSCC of a circuit is the largest Prospective Fault Current PFC In a single phase system this would be the larger of the earth loop PFC and the neutral loop PFC In a multi phase system phase phase loops also need to be considered and these can be measured using the Loop L L switch position When the instrument measures the loop resistance it also calculates the PFC After any loop test this may be displayed by pressing the DISPLAY key The PFC is calculated by using the sum Nominal supply voltage Loop resistance The nominal supply voltage depends on the actual measured voltage and the configuration of the instrument As supplied The Installation Testers are configured as follows Actual measured Voltage Nominal Voltage 150 V 110 V 230 V 400 V gt 150 V and lt 300 V gt 300 V PFC measurement accuracy An accurate PFC measurement requires an accurate measurement of the loop resistance The difference of a few digits in the loop resistance measured will have a large effect on the PFC displayed Errors can be reduced by e Using the 2 wire lead set with prods and making a firm connection to clean conductors Making several tests and taking the average e Ensuring that potential sources of noise in the ins
31. ne MEGGER spare parts Consult the Appointed Distributor Agent regarding spare parts repair facilities and advice on the best course of action to take Returning an Instrument for Repair If returning an instrument to the manufacturer for repair it should be sent freight pre paid to the appropriate address copy of the Invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through Customs A repair estimate showing freight return and other charges will be submitted to the sender if required before work on the instrument commences MULTI AMP BIDDLE MEGGER AVO INTERNATIONAL Archcliffe Road PO Box 9007 4651 S Westmoreland Road MEGGER SARL Dover Valley Forge Dallas 29 All e de Villemomble Kent CT17 9EN PA 19484 9007 TX 75237 1017 93340 Le Raincy England U S A U S A Paris France Tel 44 0 1304 502100 Tel 1 610 676 8500 Tel 1 800 723 2861 U S A only Tel 33 1 43 02 37 54 Fax 44 0 1304 207342 Fax 1 215 676 8610 Tel 1 214 330 3203 International Fax 33 1 43 02 16 24 Fax 1 214 337 3038 This instrument is manufactured in the United Kingdom The Company reserves the right to change the specification or design without prior notice MEGGER and AVO are registered Trade Marks of AVO INTERNATIONAL LIMITED Copyright AVO INTERNATIONAL LIMITED Part Number 6172 402 Edition 3 Printed in England 7FF
32. nt to serial printer with 25 way D socket Installation Tester Setup For earth electrode measurements For earth electrode measurements Windows program for Installation Testing certificate generation etc Part Number 6420 114 6420 121 6220 611 6231 631 6231 632 6231 633 6231 635 6231 634 6231 636 6231 637 6180 405 25955 025 25955 026 6220 629 5152 253 6231 148 Contact Distributor Publications Part Number User Guide 6172 402 Testing Electrical Installations 6172 129 A detailed account of how to carry out practical testing to BS 7671 16th Edition IEE Wiring Regulations A Stitch in Time AVTM21 P8B The complete guide to electrical installation testing Getting Down to Earth AVTB25 TA A practical manual on earth resistance testing t Available in several languages Please contact your local distributor for availability 37 Basic and Service Error Calculation Basic and service errors for Insulation and Resistance ranges The basic error is the maximum inaccuracy of the instrument under ideal conditions whereas the service error is the maximum inaccuracy taking into effect of battery voltage temperature interference and system voltage and frequency where applicable After determining the service error we can then calculate the measurement range This is the range of measurement over which the error in service is less than 30 of the reading Digital instruments are affected b
33. null position Continuity Bleeper position Insulation test positions a Turn Rotary Selector Switch to e Select test position Select Download RCL Select OFF Touch button Single Phase Earth gt 100 V Polarity indication Thermal Trip operated Low Battery voltage indication 3 Phase sequence Plug polarity LOOP RCD alls lt LOOP RCD tI 10 0 60 080 1 00 120 1400110 2 RCD Test 2 0401 Selection 180 020 1 80 Ny SX RR 2 8 10002 m 0 0 4 Excessive 5 gt L Ll 2 1 111 RCD Selection Over Under Range Fuse Ruptured Display Lead resistance null On toma Connections Operation Backlight The display backlight gives a clear display of measurements in poor lighting conditions The backlight will briefly operate when the instrument is switched on To switch the backlight On press the key Press the key again to switch the backlight Off To conserve battery power the backlight will automatically switch off after a period of 15 seconds if the battery voltage is low this period is automatically reduced Auto Shut Off To extend battery life and reduce unnecessary drainage the Installation Tes
34. nuously if the resistance between the leads is less than 100 5Q for CM300 amp CM400 Low input resistance voltmeter A 500 only In switch positions other than the supply voltage is measured with a high input resistance This can cause misleading readings if cables are open circuit In the position the input resistance is initially about 1 kQ If external voltage is measured at the terminals the bleeper sounds with a slow intermittent tone and displays the voltage This will not damage the instrument however thermal protective devices will inhibit immediate use of the Continuity bleeper for a short period If the hot amp symbol is displayed confirm the bleeper operation by shorting the test leads and waiting for the normal continuous bleeper tone 5Q Threshold CM500 only A lower threshold of 5 Q can be set by pressing the TEST button When this is set the bleeper will sound with a fast intermittent tone if the resistance between the leads is between 100 Q and 5 Q and continuously if the resistance is less than 5 Q When set to this mode the 500 mA fuse is used to protect the instrument and may be ruptured by connection to a mains supply Method of measurement The 2 wire lead set must be used for this measurement A d c voltage of nominally 4 5 V with a current limit of approximately 210 mA is used to measure resistance less than about 30 Q Higher resistances are measured with a curren
35. op Resistance 2 15 mA Use these tables to determine the minimum indicated reading for a limit taking into account the maximum service error of the instrument 39 Repair and Warranty The instrument circuit contains static sensitive devices and care must be taken in handling the printed circuit board If the protection of an instrument has been impaired it should not be used and be sent for repair by suitably trained and qualified personnel The protection is likely to be impaired if for example the instrument shows visible damage fails to perform the intended measurements has been subjected to prolonged storage under unfavourable conditions or has been exposed to severe transport stresses New Instruments are Guaranteed for 1 Year from the Date of Purchase by the User Note Any unauthorised prior repair or adjustment will automatically invalidate the Warranty Instrument Repair and Spare Parts For service requirements for MEGGER Instruments contact INTERNATIONAL Archcliffe Road AVO INTERNATIONAL Valley Forge Corporate Center Dover 2621 Van Buren Avenue Kent CT17 9EN Norristown PA 19403 England U S A Tel 44 0 1304 502243 Fax 44 0 1304 207342 Tel 610 676 8579 Fax 610 676 8625 or an approved repair company 40 Approved Repair Companies A number of independent instrument repair companies have been approved for repair work on most MEGGER instruments using genui
36. pressing any other key The code rcl is displayed Clear data and re set factory default settings The instrument will remember certain values such as the insulation test voltage the RCD test current and the lead null resistance even if the instrument is switched Off and the battery removed These can be re set to the factory default settings as follows 1 Move the rotary selector switch to the RCL position The code rcl is displayed 2 Press the RCL 2 keys together with the Backlight 3 key The code clr is displayed 3 Confirm the operation by pressing the SAVE key or abort by pressing any other key The code rcl is displayed Print Results 1 Connect printer and the instrument with a serial printer lead 2 Move the rotary selector switch to the RCL position The code rcl is displayed 3 Commence the printout by pressing the TEST key Abort at any time by pressing and holding the DISPLAY key The code rcl is displayed Note The instrument cannot respond to a busy signal given by a printer and therefore waits at the end of each line To change the wait time see Initial Setup Note Setup The printout language can be changed See Initial Retrieve Stored Results It is possible to view previously stored test results by switching the rotary switch to the RCL position 1 Move the rotary selector switch to the RCL position The code rcl is displayed 2 Select the required distribution board b
37. ration contd 150 mA 40 ms test When an RCD is fitted for personal protection a test current of 150 mA must cause the RCD to trip in less than 40 ms 1 Select 150 mA 40 ms on the rotary switch 2 Connect to the supply as detailed below 3 Select and set the Trip Test to 0 or 180 using the key 4 Press the TEST key If the RCD trips within 40 ms the trip time is displayed Ramp Test measuring the trip current The trip current is measured by applying a test current of half the rated trip current and increasing this every 200 ms When the supply is cut the current flowing is recorded and displayed A low trip current could be due to an overly sensitive RCD or to leakage currents in the supply RCD rating Step Value 100 50 150mA 150 300mA 500 1040mA To determine the trip current of an RCD 1 Select an appropriate RCD rated current on the rotary switch 300 500 1000 22 2 Connect to the supply as detailed the next page 3 Select the Ramp test 44 using the key 4 Select the RCD type using the TYPE key 5 Press and hold the TEST button If the RCD trips the first displayed result depends upon the Setting selected Setting A The contact or fault voltage is displayed with the Loop or earth resistance trip current and trip resistance available by pressing the DISPLAY key Setting b The trip time is displayed with the trip resistance contact fault voltage and
38. rip test started on a zero crossing when the 1 80 voltage is on the fall Test current increases from half the Ramp test rated current of the RCD The result is the current at which the trip opens Trip test at 5 X the rated current of the selected RCD The choice of 0 or 180 gives greater accuracy of 5 Trip Test measurement A I test is carried I out before this and the resistance and voltage are available after the test Pressing the I key displays the Type of Test symbols individually in sequence Select the type of the test to be performed 20 No Trip Tests When an or Trip test is performed the loop or earth resistance is measured and in Setting b a two second No Trip test follows Loop or Earth resistance measurement The loop resistance is measured at half the rated RCD current selected Contact voltage is displayed which is the loop resistance multiplied by the rated RCD current A high loop resistance will cause the instrument to display gt 90 V and safely abort the test The earth resistance is measured if a lead is connected into socket S on the top of the instrument Refer to Earth Resistance Measurement for correct positioning of the earth test spike The earth test gives the resistance of the local spike whereas the loop test will give the entire Line Earth loop resistance value 2 second No Trip test Setting b only This tests that the RCD does not trip when half the rat
39. rmed with the polarity 0 and 180 and the maximum time taken D C sensitive RCDs are tested with a pulsed waveform The rms current is V2 x the rated operating current of the RCD As with the normal RCDs these should be tested with 0 and 180 polarity As the No Trip test can affect the trip time of some selective RCDs there is a 30 second delay before activation of the trip test It is possible to override this delay by pressing the TEST button when the instrument is counting 1 2 3 Note Significant operating errors can occur if loads particularly rotating machinery and capacitive loads are left connected during tests i D C sensitive RCD rating RMS currents 14 1 mA 424 mA t For supply voltages above 200 V only Trip Testing measuring the trip time 1 Select the RCD rated current on the rotary switch 2 Connect to the supply as detailed below 3 Select the required test using the I key 0 or 180 for the normal trip tests 5I together with 0 or 180 fora 5I test 4 Select the RCD type using the TYPE key 5 Press the TEST button If the RCD trips the first display depends upon the Setting selected Setting A The contact or fault voltage is displayed with the Loop or earth resistance and trip time available by pressing the DISPLAY key Setting b The trip time is displayed with the contact fault voltage and Loop earth resistance available by pressing the DISPLAY key 21 Ope
40. rt generation The Installation Testers are supplied as standard in a protective test and carry case and with the necessary mains plug lead and 2 wire lead set required to commence testing Optional accessories include the SP2 a 2 wire lead set with test switch built into one of the probes providing remote operation and a 5 metre 2 wire lead set for increased accessibility Key Features Trip loop Impedance test 500 only e Storage of test results in memory e Direct serial printer driver output e RS 232 Output for PC storage e Recall stored results to the display e RCD Ramp test function e Analogue arc and digital display e Selectable backlight e Optional switchable probe SP2 Test Capability e Insulation Test voltages of 250V 500V and 1000V Continuity testing Fast bleeper Test lead resistance nulling Automatic polarity reversal Setting A Loop Testing Operates regardless of mains polarity Setting A Two wires only needed for testing Automatic test start on voltage detection Direct indication of short circuit current Phase phase phase neutral amp phase earth tests Simple earth electrode test RCD Tests Tests selective delayed general and d c sensitive RCDs Two wires only needed for testing Contact voltage and loop resistance displayed Selectable test current for programmable devices 500 only e Supply voltage and frequency measurement Phase sequence indication e Mains outle
41. ssary and an indication given on the display Setting b requires Line and Neutral to be fixed Pre Test Configuration Before performing an RCD test it is necessary to ensure that the instrument is correctly configured for the rated current and the specific type of RCD to be tested and for the type of test to be performed RCD Current Rating From information given on the RCD to be tested select the RCD current rating on the rotary switch RCD VAR switch position 500 only This position enables any RCD with a non standard rated current between 10 mA and 1000 mA to be tested The test is performed at the selected current taking the 5I multiplier into consideration 1 Select RCD VAR 2 Toggle the DISPLAY key to display the test current 3 Press the RCL 2 keys until the required test current is displayed Hold a key down to auto repeat 4 Press the DISPLAY key The Supply Voltage Test Type and RCD type are shown These may be set up as given in the following sections Ramp and Auto sequence tests are only available if the test current is set to 10 mA The maximum possible test current including 5I multiplier is 1000 mA 300 mA for d c sensitive RCDs These limits are halved if the supply voltage is less than 200 V Setting 10 50 mA 1 mA steps 50 500 mA 5 steps 500 1000 10 mA steps RCD Type Pressing the TYPE key displays the RCD type symbols From information g
42. t limit of 2 mA The first measurement is made with current flowing from the black lead to the red lead and if Setting A has been set a second measurement will be made with the current reversed Possible sources of error Measurement results can be affected by the following impedance of operating circuits connected parallel Impedance such as inductors that vary during the measurement A poor connection to the circuit under test which give readings as much as 100 mQ 0 10 Q high The best way to avoid this error is to use sharp prods and press these firmly into the conductors being measured 13 Operation contd Insulation Testing and High Resistance Measurement The Installation Testers will test insulation resistance 1 kQ to 99 9 between phase neutral and earth ground as required at the selected voltage With a default setting of 500 V d c the test voltage can be altered to 250 V 500 V or 1 kV as required Measurement is displayed on the large digital display and the analogue scale After performing an insulation test maintain connection to the circuit under test to allow the circuit to discharge If voltage remains after a test the instrument will normally display this as it is discharged It must be verified that the test voltage has been discharged before moving onto the next test 2 wire lead set method 1 Disconnect Phase Neutral and Earth at the distribution board
43. t polarity indication Application The Installation Testers may be be connected live to earth or between live conductors of systems that have a rated voltage of 300V a c rms to earth and an installation overvoltage EN61010 1 Category III or lower This means that the instrument may be connected to any fixed wiring of a building installation but not to primary supply circuits such as overhead cables To maintain user safety and ensure accurate measurements only use the test leads supplied or recommended for use with this instrument The Installation Testers are fuse protected to 440V 10kA The maximum current which could flow through this fuse in the case of a fault is limited to 10 kA by the impedance of the test leads There is a fuse accessible in the battery compartment which protects the Insulation and Continuity range If warning of a ruptured fuse is given during a test and if the warning symbol is present when attempting to carry out an insulation test with the test leads shorted together this fuse must be replaced by another fuse of the same type and rating i e 500 F 500 V H B C 10 Fuse Replacement To replace the fuse disconnect the test leads switch the instrument Off and with a screwdriver loosen the captive screw holding the battery compartment cover in place Remove the cover Depress the fuseholder slightly and turn a quarter turn anti clockwise to release Remove the holder and replace the fuse with one o
44. t with the CM500 measuring resistance with both positive and negative current flow Normally the average of the two results will be displayed CM500 will automatically display any voltage over 25 V between the two test leads and inhibit testing if gt 5 V Test Lead Resistance Nulling The CM500 measures total resistance between its terminals including the resistance of the test leads The value of the test leads can be automatically nulled 1 Firmly short the ends of the test leads together 2 Select lead resistance null position 3 Press the TEST key The test leads are checked 4 0 00 Q is displayed to confirm that a new lead value has been stored This measured lead resistance will be subtracted from subsequent continuity tests in the Q R switch position Note that this lead nulling will not be lost when the instrument is switched off To clear any set nulling carry out a lead resistance nulling procedure with the leads open circuit Low Resistance continuity measurement Q R 1 If required firmly short test leads together and null their resistance as described above 2 Select Q R 3 Firmly connect the two wire lead set terminals across the isolated circuit 4 Press the TEST key The test result is displayed The symbol is displayed if lead resistance nulling has been set Continuity Bleeper To quickly check continuity of a circuit the instrument bleeper will sound conti
45. tallation are isolated switched off e Ensuring that the instrument is calibrated Earth Loop measurement at 15 mA 500 only The LOOP 2 kQ 15 mA range is a high resolution low current resistance range The 15 mA current enables the earth loop resistance to be measured without tripping all types of RCDs with a rated current of 30 mA or higher Tests may be made via installation sockets with the plug terminated test lead or at any other point using the 2 wire lead set Connections are required to Line and Earth only 15 mA Phase to Neutral or Earth loop impedance measurement Power plug method 1 Select Loop 2kQ 15mA 2 Insert the plug into an installation socket 3 Supply voltage and polarity are displayed 4 Press the TEST key Test progress is displayed 5 Measured loop value is displayed If desired the test can be repeated by pressing TEST again 15 mA Phase Earth loop impedance measurement 2 wire method 1 Select Loop 2 15 mA 2 Firmly connect the red lead to phase and the black lead to earth No connection to neutral is required Operation contd 3 Supply voltage is displayed Note Though displayed polarity indications are invalid with the 2 wire lead set and should be ignored 4 Press the TEST key Test progress is displayed 5 Measured loop value is displayed If desired the test can be repeated by pressing TEST again Method of measurement The phase earth phase neutral or
46. ters use advanced battery management techniques switching functions Off when they are not required For example if an external voltage of 25 V or less is applied no value is displayed unless the backlight is switched on After a period of instrument inactivity the instrument will switch itself off preceded by a series of bleeps To switch the instrument back on press any key Switched Probe SP2 This accessory can be used anywhere that the 2 wire lead set is specified in this User Guide The press switch on the probe duplicates the function of the TEST key on the instrument allowing quick and easy testing The SP2 probe test key circuit is hazardous live during a test It is safe in normal use Continuity of the SP2 probe non replaceable fuse must be confirmed by testing in the Bleeper range before making any measurement Checking Earth Potential To quickly distinguish live and earth this feature provides display 10 indication if a voltage greater than 100 V exists between the earth connection and your finger 1 any switch position except OFF RCL 2 connect the earth connection black for the 2 wire lea set green for the 3 wire lead set to earth 2 Touch a finger to the metal pad on the front panel This is safe and will not endanger you 3 Ifa voltage greater than 100 V exists between the finger normally at earth potential and the earth wire the warning symbol is displayed Voltage
47. tting b requires Line and Neutral to be fixed The Installation Tester is calibrated to give the resistance from the supply ends of the test leads Test results may be adversely affected by supply voltage fluctuations or electrical noise during measurement It is recommended that tests are repeated and the results verified when measurement results are considered abnormal Connect the test lead to the instrument first and then to the earth spike Inserting the Earth Test spike A test spike must be inserted into the ground well away gt 20 m from the main earth electrode s or anything connected to the earth electrode s Buried earthed metal pipes fences etc near to the spike could give a misleading low reading The instrument may display E32 or a very low resistance if the spike is incorrectly positioned To check the result reposition the spike and verify the readings Suitable test spikes and leads are contained in the accessory Earth Test Kit Earth resistance measurement Power plug method The earth resistance of an installation will include the effects of any parallel resistance paths from the PE conductor to earth e g cross bonded metal service pipes 1 Insert the test spike Connect the 20 m earth test lead to the instrument 4 mm socket S first and then to the test spike Select Re Insert the power plug into an installation socket Supply voltage and polarity are displayed Press the TEST ke
48. tween the automatic test and the test proper can be curtailed by operating the TEST key during the 30 second count period D C Sensitive Trip For RCDs up to 300 mA This test is the same as the Ij Trip Test above but the test current is a half wave rectified a c with an r m s value of V2I An Test for RCDs up to 100 mA This test follows the same sequence of test 30 second delay Selective type only as the test The same note applies General purpose test test for up to 40 ms Selective test test for up to 150 ms Timed Trip Tests Trip time displayed Range 0 1 ms to test time limit Intrinsic Trip time accuracy 1 1ms Intrinsic Test Current accuracy 2 8 34 Ramp Test Trip current measurement This test will perform an automatic test followed by a 30 second delay Selective type RCD only and then execute incremental ramp test Intrinsic Ramp Test Current accuracy 3 RAMP RANGE INCREMENT 5 15 mA 15 50 mA 50 150 mA 150 300 mA 250 500 mA 500 1020 mA 150 mA 40 ms Trip Test This is a stand alone test at 150 mA for 40 ms Displayed Range 0 1 ms to 40 ms There is no associated test or Delay POWER SUPPLY 8 x 1 5 V Alkaline cells type LR6 or 1 5 V nickel cadmium rechargeable cells A new set of alkaline battery cells will typically give more than 4500 insulation or 3250 continuity tests A m
49. up to 30 seconds for the supply to be switched back on before continuing with the next test The test sequence will abort if any of the tests fail or if the RCD is not reset within the time limit On completion the result of the last Fast trip test is displayed Press the DISPLAY key to sequentially display Supply voltage Supply Frequency Contact Fault voltage Earth Loop Earth Resistance 0 trip test time 180 trip test time 0 Fast trip test time 180 Fast trip test time All results can be stored under a single circuit reference See Test Result Storage Deletion and Retrieval Operation contd Connecting to the Supply Automatic testing To aid rapid testing the Installation Testers can be set to start a test automatically when connected to the supply This may be of use for example when using a clip and a probe Select the range required and press the test key without the supply present The instrument will display lt 100 V for approximately 30 seconds Apply the supply voltage within this time and the instrument will pause before performing one test automatically Power plug method The simplest way of connecting to the installation is by inserting the power plug into a convenient installation socket If Setting A is selected when using the plug terminated lead set the polarity of the mains socket is immaterial Line and Neutral will be swapped if necessary and an indication given on
50. voltage and polarity are displayed 4 Press the TEST key 5 Measured loop value is displayed On completion of this test prospective fault current can be displayed by pressing the DISPLAY key If desired the test can be repeated by pressing TEST again Phase Earth loop impedance measurement Two wire method If an installation socket is not available use the the 2 wire lead set 1 Select Loop L PE 2 Connect the red lead to phase and the black lead to earth No connection to neutral is required 3 Supply voltage is displayed Note Though displayed polarity indications are invalid with the two wire lead set 16 and should be ignored 4 Press the TEST key 5 Measured loop value is displayed On completion of this test prospective fault current can be displayed by pressing the DISPLAY key If desired the test can be repeated by pressing TEST again Bonded Metalwork Testing 1 This test is performed using the two wire lead set 1 Connect the black lead to the bonded metalwork 2 Connect the red lead to phase 3 Select Loop L PE 4 Supply voltage is displayed 5 Press the TEST key 6 Measured resistance value is displayed Bonded Metalwork Testing 2 This test can also be performed using the optional earth bond test lead allowing connection to an installation socket 1 Connect the black flying test lead to the bonded metalwork Insert the power plug test lead into a socket receptacle Se
51. y Measured earth resistance value is displayed arth resistance measurement 2 wire lead set method Insert the Test spike amp Connect the 20 earth test lead to the instrument 4 socket S first and then to the test spike Select Re Connect the red lead to phase and the black lead to earth No connection to neutral is necessary A W 5 Supply voltage is displayed Note Though displayed polarity indications are invalid when using the 2 wire test lead set and should be ignored 6 Press the TEST key 7 Measured earth resistance value is displayed Earth Electrode Resistance Measurement To measure the earth electrode resistance the earth electrode must be disconnected from the PE conductor of the installation under test To do this safely the installation must be switched Off and isolated from the supply 1 Insert the test spike 2 Connect the 20 m earth test lead to the instrument 4 mm socket S first and then to the test spike 25 Operation contd Switch Off and isolate the installation under test Disconnect the earth electrode 5 Using the 2 wire lead set connect the black lead to the earth electrode under test 6 Select Re 7 Carefully connect the red lead to the phase conductor of the incoming mains supply on the distribution board 8 Supply voltage and polarity are displayed 9 Press the TEST button 10 Measured earth resistance v
52. y pressing the RCL 2 keys The distribution board numbers are shown order that the the results were stored Hold a key down to auto repeat A long bleep is sounded when the end of the list is reached 3 Press the EXIT key to return to the RCL display or press the DISPLAY key to list the circuit numbers used in the currently displayed distribution board 29 Test Result Storage Deletion and Retrieval contd 4 30 Select the required circuit number by pressing the RCL 2 keys The circuit numbers are shown in numerical order Hold a key down to auto repeat A long bleep is sounded when the end of the list is reached Press the EXIT key to return to the distribution board selection screen or press the DISPLAY key to show the stored test codes The following codes are used to identify test results Insulation Test RCD Test Select the required test by pressing the RCL 2 keys The tests are shown in the above order Hold a key down to auto repeat A long bleep is sounded when the end of the list is reached Eon Continuity Test Press the EXIT key to return to the circuit number selection screen or press the DISPLAY key to scroll through the stored test results together with any additional connection information Download to PC The Installation Tester has been designed to be used with AVO PowerSuite for Windows which will accept the test results and enable the production of various certifi
53. y the number of digits error for example a value 0 10Q measured with the continuity range may give a display in the range 0 07 Q to 0 13 Q which is a maximum error of 30 Therefore the measurement range measuring low resistance is 0 10 to 99 9 When checking that a measurement does not exceed a limit the service error needs to be taken into account and these tables enables this to be done quickly and easily These will guarantee that the value being measured is greater than or less than the limit value specified as appropriate Min toed Min Tr Max Max Indicated Limit Indicated Limit indicated Limit Indicated Limit Indicated Limit Indicated reading reading reading reading reading reading 4 72 5 24 6 28 7 32 8 36 9 40 10 8 16 0 21 2 26 4 31 6 36 8 42 0 47 2 52 4 62 8 73 2 83 6 94 0 Error 4 4d Insulation Resistance MQ Continuity Low Resistance Q 38 Limit Indicated Limit Indicated Indicated Limit Indicated reading reading reading reading ae Max fe Max Limit Indicated Limit Indicated reading reading Loop Resistance and Earth Electrode Resistance Error 4 4d Lo
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