Biddle BMM80_UG 电路图.pdf

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1、MEGGERBMM80 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 me

2、asurement. 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 f

3、or 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 in

4、sulation. 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

5、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

6、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 thr

7、oughout by Double Insulation (Class II). Equipment complies with current EU Directives. Equipment must not be connected to installations 500V. 500V BMM80 user guide 2/1/01 10:47 am Page 1 RadioFans.CN 收音机爱 好者资料库 GENERAL DESCRIPTION The MEGGER BMM80 Series instruments are battery powered Insulation a

8、nd 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 h

9、as 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 BMM80 Series instruments have the unique capability of being able to measure voltages down

10、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, e.g. temperature or humidity measurement. There is also a facility to measure capacitance on the BMM80, this can be used in some types of t

11、elecommunications applications for fault analysis. 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 (16

12、th 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 use

13、ful for testing sensitive equipment, such as electronic components, and computer peripherals. Designed to IEC1010-1 the BMM80 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 IP5

14、4. 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 p

15、resent on all other ranges (excluding OFF/V/mV). The external voltage is indicated on the display, on insulation ranges an audible bleeper will sound if a test is attempted. BMM80 user guide 2/1/01 10:47 am Page 2 RadioFans.CN 收音机爱 好者资料库 Live Circuit Warning When more than 25V is applied to the term

16、inals in the insulation ranges, the instrument defaults to a voltmeter will give an audible warning if a test is attempted. On all other switch positions except OFF/v/mV when more than 10V is applied the default voltmeter will be activated. Testing will be inhibited. Voltage Testing on High Energy S

17、ystems 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

18、bleeps) operates after approx. 10 minutes of instrument inactivity on the insulation ranges, 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 b

19、y 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 approximately one minute before automatically switching off to conserve batt

20、ery 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. Ins

21、ulation 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 th

22、e TEST button at the end of the test. The last reading will hold on the display. 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 volta

23、ge is indicated. Locking Test Button (ltb) When it is desired to do a long insulation test, the test can be BMM80 user guide 2/1/01 10:47 am Page 3 RadioFans.CN 收音机爱 好者资料库 locked on by pressing the key while the TEST button is held down. The warningwill appear on the display and both buttons may be

24、released whilst the test continues. The next press of the test button will terminate the test. Note: There is a safety delay of a few seconds on the first operation of 1000V range, each time the range is selected. Polarisation Index Testing Polarisation Index (PI) is the term applied to the Dielectr

25、ic Absorption Ratio when resistance values are measured after 1 minute and again after 10 minutes. Polarisation 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 as

26、sessment 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

27、. Any voltage present will be indicated on the display so that the discharge can be monitored. TYPICAL TERMINAL VOLTAGE CHARACTERISTICS 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 measu

28、re 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. This range is not suitable for diode testing since the automatic contact detector FIG.1 BMM80

29、 user guide 2/1/01 10:47 am Page 4 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 Resistan

30、ce 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 p

31、rods. 3. When the reading has stabilised, press the TEST button. A short bleep will sound and the zero offset symbol will appear. 4. To release the zero offset press the test button again. Possible sources of error Measurements and results can be effected by the following: The impedance of operating

32、 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

33、. 1. Set the selector switch to 2. Connect the test leads. 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

34、. Connect the test leads. 3. The test will activate automatically. 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 FIG.1 BMM80 user guide 2/1/01 10:47 am Page 5 specification even if the fuse

35、is 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. Millivolt Tests (mV) The measured a.c. or d.c. voltage is indicated on th

36、e display. 1. Set the selector switch to mV. 2. Select either a.c. or d.c. mV using thekey. 3. Connect the test leads. 4. After a short settle time, the reading will be displayed automatically. Note: Live circuit warning does not function on mV range. Zeroing of d.c. mV (no zero facility on a.c. mV)

37、 Any standing offset on the d.c. mV range can be zeroed (Up to 9,9mV). The zero information is retained in non-volatile memory and so will be remembered when the instrument is switched OFF. 1. Select the d.c. mV range. 2. Short the test leads together. 3. When the reading has stabilised, press the T

38、EST button. The zero offset symbol will appear. 4. To release the zero offset press the TEST button again. Capacitance Tests (uF) The measured capacitance is indicated on the display. 1. Set the selector switch to uF. 2. Connect the test leads. 3. After a short settling time, the reading will be dis

39、played automatically. Zeroing of uF Offsets on the uF range can be zeroed (Up-to 10,0nF). The zero information is retained in non-volatile memory and so will be remembered when the instrument is switched OFF. 1. Select the uF range. 2. Disconnect the test leads from the circuit under test. 3. When t

40、he reading has stabilised, press the TEST button. The zero offset symbolwill appear. 4. To release the zero offset press the TEST button again. Using the MEGGER SP1 Switched Probe Operation: The MEGGER SP1 is an accessory for designated MEGGER installation test instruments. When fitted in the specia

41、lly designed connector, in place of the existing Low lead, the SP1 acts as a remote test button to operate the instrument and as a Low probe. This simplifies instrument control and two- handed probing. The SP1 is suitable for use with MEGGER insulation test instruments up to 1kV output test voltage.

42、 Safety: Meets the safety requirements for double insulation to IEC1010-2-031 (1995), EN61010-2-031 (1995), IEC1010-1 (1995), EN61010-1 (1995) Category III*, 300V phase to earth BMM80 user guide 2/1/01 10:47 am Page 6 and 500V phase to phase. The probe is fitted with an internal non-replaceable fuse

43、 to protect the user should the probe be used accidentally in conjunction with a test lead in the low terminal. * Relates to transient overvoltage likely to be found in fixed installation wiring. Do not use the probe if any part of it is damaged. Battery Replacement When the low battery symbol appea

44、rs, the cells are nearly exhausted and should be replaced as soon as possible. Use Alkaline cells IEC LR6 (AA) or NiCd rechargeables. To install or replace the cells, disconnect the test leads, switch the instrument to OFF and loosen the captive screws on the rear of the battery compartment. Remove

45、the cover and disconnect the battery holder from the battery leads. Ensure that the replacement cells are fitted with the correct polarity in accordance with the label in the battery holder. Reconnect the battery holder to the battery leads. Replace and re-secure the battery compartment cover. Remov

46、e the cells if the instrument is not going to be used for an extended period of time. Fuse Checking and Replacement To check the instrument fuse, switch to an insulation range and press the TEST button. The symbol will appear if the fuse is ruptured. To replace the fuse, disconnect the test leads, s

47、witch the instrument OFF and loosen the captive screws holding the battery compartment cover in place. Remove the cover and replace the fuse. Replace and re-secure the battery compartment cover. SPECIFICATION (All quoted accuracies are at +20C.) INSULATION RANGES Nominal Test Voltage(d.c.): 50V, 100

48、V, 250V, 500V, 1000V Test voltage accuracy: +15% maximum on open circuit Short circuit current: 3M CAPACITANCE Measuring Range:0,1nF to 9,99uF Accuracy:3% 2digits 0,2nF uF zeroing:up to 10nF Basic and service errors for Insulation and Resistance ranges The basic error is the maximum inaccuracy of th

49、e 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 by the number of digits error for example a value 0,10 measured with the continuity range may give a display in the range 0,07 to 0,13 which is a maximum er