Biddle BMM2000_SERIES_UG 电路图.pdf

MEGGERBMM2000 Series Insulation Multimeters User Guide 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 de-energised and isolated before connections are made except for voltage measurement. Circuit connections must not be touched during a test. After insulation tests, capacitive circuits must be allowed to discharge before disconnecting the test leads. The Live Circuit Warning and Automatic Discharge are additional safety features and should not be regarded as a substitute for normal safe working practice. Replacement fuses must be of the correct type and rating. Failure to fit the correctly rated fuse will result in damage to the instrument in the event of an overload. Test leads, including crocodile clips, must be in good order, clean and have no broken or cracked insulation. Ensure that hands remain behind guards of probes/clips when testing. U.K. Safety Authorities recommend the use of fused test leads when measuring voltage on high energy systems. NOTE THE INSTRUMENTS MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS Users of this equipment and/or their employers are reminded that Health and Safety Legislation require them to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as from inadvertent short circuits. Where the assessments show that the risk is significant then the use of fused test leads constructed in accordance with the HSE guidance note GS38 Electrical Test Equipment for use by Electricians should be used. Symbols used on the instruments are: Caution, risk of electric shock. Caution, refer to User Guide. Equipment protected throughout by Double Insulation (Class II). Equipment complies with current EU Directives. Equipment must not be connected to installations 500V. 500V RadioFans.CN 收音机爱 好者资料库 GENERAL DESCRIPTION The MEGGER BMM2000 Series instruments are battery powered Insulation and Continuity testers, with a measurement capability from 0,01 Continuity to 200G Insulation. Offering multi-voltage facilities, the instruments take full advantage of microprocessor technology and feature a large liquid crystal display combining digital and analogue readings. The analogue display has the benefit of indicating trends and fluctuations in readings, while the digital readout gives direct accurate results. The display is also backlit giving clear visibility even in low light conditions. The BMM2000 Series instruments have the unique capability of being able to measure voltages down to a resolution of 0,1mV. This gives the user the option to fit a wide variety of transducers to further enhance the capabilities of the BMM Series instruments, eg temperature or humidity measurement. A customised connector on the top of the instrument enables the optional MEGGER SP1 Switched Probe to be used for two handed probe operation. The 250V, 500V and 1000V ranges can be used to test electrical installations in compliance with BS7671 (16th Edition IEE Wiring Regulations) IEC364 and HD384, since each range has a 1mA minimum test current at the minimum pass values of insulation specified in these documents. The 100V range is ideal for testing telecommunications equipment which would be damaged by higher voltages. The 50V range is useful for testing sensitive equipment, such as electronic components, and computer peripherals. The BMM2000 series instruments have a current facility which enables up to 500mA to be measured, (not ESD models), this together with , V and mV ranges means that the instrument can realistically be used in situations where previously a multimeter would be needed.For higher currents an optional current clamp is available. Designed to IEC1010-1 the BMM2000 Series are protected against connection to a 500V Category III supply. The instruments have a basic accuracy of 2% at 20C. The instruments are waterproof and dustproof to IP54. This helps maintain accuracy and ensures maximum reliability in harsh environments. OPERATION Refer to Safety Warnings before using the instrument Testing is automatically inhibited if: An external voltage 25V is present when switched to any insulation range position. An external voltage 10V is present on all other ranges (excluding OFF/V). The external voltage is indicated on the display, on insulation ranges an audible bleeper will sound if a test is attempted. RadioFans.CN 收音机爱 好者资料库 Live Circuit Warning When more than 25V (10V on 10V insulation range) is applied to the terminals in the insulation ranges, the instrument defaults to a voltmeter and gives an audible warning if a test is attempted.On all other switch positions except OFF/V when approx 10V is applied the default voltmeter will be activated. Testing will be inhibited. Voltage Testing on High Energy Systems Use extreme care when using or measuring voltages above 30V, particularly in high energy systems. Fused test leads are available as optional accessories for local situations where increased protection is required. Auto-shut Off To conserve battery life, Auto-shut Off (preceded by a series of bleeps) operates after approx. 10 minutes of instrument inactivity on insulation, 5 minutes on all other ranges. If the instrument is switched on whilst holding thekey, the Auto shut-off time is extended to 60 minutes. To restore operation after Auto-shut Off, either select OFF followed by the required switch position. Note: It is recommended that the instrument is switched to the OFF position when not in use. Backlight The backlight is activated by pressing thekey. The backlight will remain illuminated for approx. one minute before automatically switching off to conserve battery life, alternatively thekey can be re-pressed. Insulation Tests (M) (See fig. 1) The insulation tests apply a known voltage to the circuit under test and measure the resulting leakage current. The circuit under test must be completely de-energised and isolated before test connections are made. Insulation tests are only initiated when the TEST button is pressed. 1. Set the range switch to the test voltage required. 2. Connect the test leads, first to the instrument, and then to the isolated item under test. 3. Press the TEST button to activate the test voltage. Take the reading. 4.Release the TEST button at the end of the test. 5. Any capacitive circuits charged during a test will automatically discharge. If significant voltage remains the voltage warning will occur and the voltage present displayed. 6. Remove the test leads only when no voltage is indicated. Locking Test Button (ltb) When it is desired to do a long insulation test, the test can be locked on by pressing thekey while the test button is held down. The warningwill appear on the display and both buttons may be released whilst the test continues. The next press of the test button will terminate the test. RadioFans.CN 收音机爱 好者资料库 Note: There is a short delay on the first operation of 1000V range, each time the range is selected. This is to prevent accidental application of 1kV. The M range features a leakage current display. Leakage current is the value of current that flows during the insulation test. To view the leakage current press the key. To view insulation resistance press the key again. Good Procedure Whilst Insulation Testing Care must be taken when taking measurements greater than a few G. The leads must be clean dry and in good condition. They must also not be allowed to tangle. It is also advisable that the switched probe SP1 is not used as the accuracy at high value measurements is not guaranteed. The instrument should also be clean and dry with particular attention paid to the terminals. Also attempt to reduce any leakage that may give erroneous results on the item under test. Polarisation Index Testing Polarisation Index (PI) is the term applied to the Dielectric Absorption Ratio when resistance values are measured after 1 minute and again after 10 minutes. Polarization Index is then the resistance value after 10 minutes divided by the resistance value after 1 minute. The test can be run at any voltage. More detailed information on PI Testing and value assessment can be found in AVO International publications listed in the Accessories page. Automatic Discharge When the TEST button is released after an insulation test (or re-pressed if ltb feature is enabled), a 200k load is automatically switched across the terminals to discharge the item under test. Any voltage present will be indicated on the display so that the discharge can be monitored. TYPICAL TERMINAL VOLTAGE CHARACTERISTICS L1 L2 L3 N FIG.1 1100 1000 900 800 700 600 500 400 300 200 100 0.010.11101001000 1000V 500V 250V RESISTANCE (M) VOLT (d.c.) 50V - 1000V Ranges 10V Range Continuity Testing () (See fig.2) The continuity tests are activated when the probes make contact of less than a few k. The tests apply a constant current and measure the resulting volt drop across the circuit under test. The test operates without the need to press the TEST button. When the test leads are removed the reading will hold for a few seconds and then reset. To recall the last result press thekey. This range is not suitable for diode testing since the automatic contact detector will not be activated when connected to a diode. 1. Set the selector switch to . 2. Connect the test leads. 3. The test will activate automatically. 4. After the test probes are disconnected, the reading will be held for a few seconds. Zeroing of Test Lead Resistance The resistance of the test leads can be nulled on the continuity range (up to 9,99). The null information is retained in non- volatile memory and so will be remembered when the instrument is switched off. 1. Select the Continuity range. 2. Short the test leads across a known good conductor using prods. 3. When the reading has stabilised, press the TEST button. The zero offset symbolwill appear. 4. To release the zero offset press the TEST button again. The continuity range features a range lock facility. To LOCK the continuity range press thekey, the LOCK symbol will appear. To scroll through the available ranges press the key. To de-select the LOCK feature hold thekey down. Possible sources of error Measurements and results can be effected by the following: The impedance of operating circuits connected in parallel Impedance such as inductors that vary during the measurement A poor connection to the circuit under test. Continuity Bleeper The continuity bleeper sounds continuously when less than 5 is detected. Short bleeps will sound for resistances lower than a few k and above 5. 1. Set the selector switch to 2. Connect the test leads. FIG.2 L1 L2 L3 N PE Display:Audible: <5continuous bleep 3kno bleep Resistance Tests (k) This is a low voltage (5V) low current (25A) test for sensitive electronic equipment. It operates in the same way as the continuity ranges. 1. Set the selector switch to k. 2. Connect the test leads. 3. The test will activate automatically. The k range features a range lock facility. To LOCK the k range press thekey, the LOCK symbolwill appear. To scroll through the available ranges press thekey. To de-select the feature hold thekey down. The resistance range is protected by a high impedance method and therefore if the instrument is connected to a live circuit the fuse will not blow as on the insulation, continuity and buzzer ranges. The instrument will merely indicate the applied over- voltage. Diode Testing This range can also be used for diode testing, the positive terminal being the source of the test current. The diode symbolwill appear if the voltage developed across the terminals is within semi-conductor junction limits. These features together with the small test current and wide measurement range(0,01k to 10000k) make the resistance range very useful for general purpose testing. Voltage Tests (V) If 1V a.c. or d.c. is present at the terminals the measured voltage is indicated on the display. The voltage display will function within specification even if the fuse has blown. If the voltmeter operation is in question, test the voltmeter on a known source. 1. Set the selector switch to V. 2. Connect the test leads. 3. After a short settling time, the reading will be displayed automatically. To view the frequency of the a.c. V being measured press the key. The frequency will be displayed in the range 16Hz- 460Hz. To view a.c. V press thekey again. Millivolt Tests (mV) The measured a.c. or d.c. voltage is indicated on the display. 1. Set the selector switch to mV. 2. Select either ac or dc mV using thekey. 3. Connect the test leads. 4. After a short settle time, the reading will be displayed automatically. Zeroing of d.c. mV (no a.c. mV zero facility) To zero the d.c. mV range, short the leads together in the d.c. mV position, wait for the reading to settle and then press the TEST button. Up to 9,9mV can be zeroed on the d.c. mV range. The symbolwill appear to indicate the zero has been adjusted. 1. Select the d.c. mV range. 2. Short the test leads together. 3. When the reading has stabilised, press the TEST button. The zero offset symbolwill appear. 4. To release the zero offset press the TEST button again. To view the frequency of the a.c. mV being measured press the key. The frequency will be displayed in the range 16Hz- 460Hz. To view a.c. mV press thekey again. For inputs less than 10mV frequency is not displayed. Capacitance Tests (uF) (BMM2080 only) The measured capacitance is indicated on the display. 1. Set the selector switch to uF. 2. Connect the test leads to the circuit under test. 3. After a short settling time, the reading will be displayed automatically. Zeroing of uF To zero the uF range, disconnect the leads, wait for the reading to settle and then press the TEST button. Up to 10,0nF can be zeroed on the uF range. The symbolwill appear to indicate the zero has been adjusted. 1. Select the uF range. 2. Disconnect the test leads from the circuit under test. 3. When the reading has stabilised, press the TEST button. The zero offset symbolwill appear. 4. To release the zero offset press the TEST button again. The range is suitable for the testing of discrete components and short low interference level signal lines. If electrolytic capacitors are being tested then the red lead should be connected to +ve of the capacitor. This range is not suitable for checking capacitance of signal lines which are subject to high levels of a.c. interference. When the test is started - will show on the display, if there is excessive noise this symbol will remain or flash indicating that there is too much noise for a result to be reached. Milliamps Tests (mA) (Not BMM2000ESD) Because of the low source impedance associated with current measuring this test has an added feature ensuring that when the range is first entered the default