FLUKE 87_89iv 电路图.pdf

87 a Caution identifies conditions and actions that may damage the Meter or the test instruments. International Symbols International symbols used on the Meter and in this manual are explained in Table 1. Table 1. International Symbols Symbol Meaning Symbol Meaning Alternating current Earth ground Direct current Fuse Alternating or direct current Conforms to European Union directives Refer to the manual. Important information. Conforms to relevant Canadian Standards Association directives Inspected and licensed by TV Product Services. Double insulated Battery Underwriters Laboratories, Inc. Safety Information 3 Safety Information Warnings and Precautions To avoid possible electric shock or personal injury, follow these guidelines: Do not use the Meter if it is damaged. Before you use the Meter, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors. Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads before you use the Meter. Do not use the Meter if it operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced. Do not operate the Meter around explosive gas, vapor, or dust. Do not apply more than the rated voltage, as marked on the Meter, between terminals or between any terminal and earth ground. Before use, verify the Meters operation by measuring a known voltage. When measuring current, turn off circuit power before connecting the Meter in the circuit. Remember to place the Meter in series with the circuit. When servicing the Meter, use only specified replacement parts. Use caution when working above 30 V ac rms, 42 V peak, or 60 V dc. Such voltages pose a shock hazard. Avoid working alone. When using the probes, keep your fingers behind the finger guards on the probes. Connect the common test lead before you connect the live test lead. When you disconnect test leads, disconnect the live test lead first. Remove test leads from the Meter before you open the battery door. Do not operate the Meter with the battery door or portions of the cover removed or loosened. To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the low battery indicator () appears. Use only type AA batteries, properly installed in the Meter case, to power the Meter. Caution To avoid possible damage to the Meter or to the equipment under test, follow these guidelines: Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance. Use the proper terminals, function, and range for your measurements. Before measuring current, check the Meters fuses and turn power OFF to the circuit before connecting the Meter to the circuit. 87 updates 4/second. Analog: 51 segments, updates 40/second. Temperature Operating: -20 C to +55 C; Storage: -40 C to +60 C Altitude Operating: 2000 m; Storage: 10,000 m Temperature Coefficient 0.05 x (specified accuracy) / C (28 C) Electromagnetic Compatibility (EMC) Susceptibility and Emissions: Commercial Limits per EN61326-1 Relative Humidity 0 % to 90 % (0 C to 28 C); 0 % to 70 % (28 C to 55 C) Battery Type 4 AA Alkaline, NEDA 15A or LR6 Battery Life 72 hrs typical (with backlight off) Shock Vibration Per MIL-T-PRF 28800 for Class II instruments Size 3.94 in x 8 in x 1.97 in (10.0 cm x 20.3 cm x 5.0 cm) (Not Including Accessory Mount) Weight 1.2 lbs (545 g) Case Sealing IP-42 per IEC 529, Section 3 Warranty Lifetime Calibration Interval 1 year Compliances Complies with ANSI/ISA S82.01-94, CSA 22.2 No. 1010.1- 92 to 1000 V Overvoltage Category III, Pollution Degree 2.* Certifications (listed and pending) CSA per standard CSA/CAN C22.2 No. 1010.1-92 UL per standard UL3111-1 (pending) TV per standard EN 61010 Part 1-1993 (pending) *CAT III: OVERVOLTAGE (Installation) Category III, Pollution Degree 2 per IEC1010-1 refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations. Examples include electricity meter and primary over-current protection equipment. 87 2.5 ms for single events. Frequency Counter Sensitivity Minimum Sensitivity (RMS Sine Wave) 1 Input Range 40 Hz to 20 kHz 2 15 to 40 Hz 3 20 to 500 kHz 3 Approximate Trigger Levels (DC Voltage Function) 50 mV (dB only) 15 mV to 3 mV 15 mV 15 mV 25 mV 500 mV 50 mV to 30 mV 50 mV 30 mV 35 mV 6 mV 3000 mV 1500 mV to 300 mV 2000 mV 2000 mV 170 mV 6 mV 5 V 1.5 V to 0.3 V 2 V 2.2 V 1.7 V 0.25 V 50 V 15 V to 3 V 15 V 5 V 3.5 V 2.5 V 500 V 50 V to 20 V 50 V 50 V 35 V 25 V 1000 V 250 V to 100 V 250 V 50 V 35 V 25 V 1. Maximum input for specified accuracy = 10 x Range or 1000 V, ac-coupled only. Accuracy: add 1 count 2. Sensitivity improves linearly from 40 Hz to 20 kHz. 3. Useable at reduced sensitivity to 0.5 Hz and 999.99 kHz. 87 & 89 Series IV Service Manual 10 Burden Voltage (A, mA, A) FunctionRangeBurden Voltage (typical) mA - A500.00 A102 V / A 5,000 A102 V / A 50.000 mA1.8 mV / mA 400.00 mA1.8 mV / mA A5.0000 A0.04 V / A 10.000 A0.04 V / A Input Characteristics FunctionInput Impedance (Nominal) Volts, mV10 M, 100 dB -dc, 50 Hz, or 60 Hz 0.1%90 dB at 50 Hz, or 60 Hz 0.1% AC Volts, mV 90 dB dc to 60 Hz Full-Scale Voltage Open Circuit Test VoltageTo 5 M30 M + nS Ohms< 5 V500 mV3.1 V Diode Test< 5 V3.1000 V Typical Short-Circuit Current 500 5 k50 k500 k5 M30 M Ohms100 A100 A10 A1 A0.1 A0.1 A Diode Test0.8 mA typical Required Equipment 11 Required Equipment Required equipment is listed in Table 2. If the recommended models are not available, equipment with equivalent specifications may be used. Repairs or servicing should be performed only by qualified personnel. Table 2. Required Equipment EquipmentRequired CharacteristicsRecommended Model CalibratorAC Voltage Range: 0-1000 Vac Accuracy: + 0.1 % Frequency Range: 20 Hz 100 kHz Accuracy: +3 % DC Voltage Range: 0-1000 Vdc Accuracy: + 0.006 % Current Range: 0-10A Accuracy: AC mA - +0.18 % AC A - + 0.38 % Frequency range: 1 kHz 20 kHz DC mA - + 0.06 % DC A - + 0.125 % Frequency Source: 0.5-20 kHz Accuracy: + 0.00125 % Amplitude: 1 Volt Accuracy: + 5 % Ohms Range: 0 - 50 M Accuracy: + 0.0125 % Capacitance Range: 110.0 nF & 11.00 uF Accuracy: +0.25% Temperature Range: -10 to 350 C Accuracy: 0.3% Fluke 5520A Thermocouple Adapter Accessory K-typeFluke 80AK K-type Thermocouple K-type, mini-plug on both endsN/A Infrared (IR) AdapterFluke P/N 690518 87/89 IV Service Software Fluke P/N 676152 87 & 89 Series IV Service Manual 12 Basic Maintenance Warning To avoid electrical shock or personal injury, remove the test leads and any input signals before opening the case or replacing the battery or fuses. To prevent damage or injury, install ONLY batteries or fuses specified for this product. Opening the Meter Case Caution To avoid unintended circuit shorting, always place the uncovered Meter assembly on a protective surface. When the case of the Meter is open, circuit connections are exposed. To open the Meter case, do the following: 1. Disconnect test leads from any live source, turn the rotary switch to OFF, and remove the test leads from the front terminals. 2. Remove the battery door by using a flat-blade screwdriver to turn the battery door fasteners 1/4-turn counterclockwise. 3. The case bottom is secured to the case top by four screws, one at each corner. Remove the screws with a Phillips-head screwdriver. 4. Pull the two halves of the case apart. Removing and Reinserting the Circuit Board Assembly The circuit board assembly must be removed to access and replace the LCD. Caution The circuit board is extremely susceptible to contamination. Handle it by the input receptacle, fuse clips or edges of the board only. You can use clean surgical gloves to help avoid contamination. 1. Open the Meter case and remove the case bottom to access the circuit board. 2. Remove the two Phillips-head screws securing the circuit board to the case top and lift it out carefully to avoid contamination. 3. To reinsert the circuit board, simply place it into the case top with the LCD display showing through the window. 4. Carefully replace the two Phillips-head screws that connect the circuit board to the case top. Caution Do not over-torque the two Phillips-head screws when you reconnect the circuit board to the case top. Doing so may create shielding problems and cause the Meter to give incorrect readings. Basic Maintenance 13 Replacing the LCD If you need to replace the LCD, you will find it easier to leave the LCD assembly attached to the circuit board and access the LCD by removing the LCD mask from the front of the LCD assembly. 1. Remove the circuit board as described under “Removing and Reinserting the Circuit Board Assembly.” 2. Carefully insert the tip of a thin screwdriver under the LCD mask at the top of the display as shown in Figure 1. LCD LCD Mask aau05f.eps Figure 1. Removing LCD Mask to Access LCD 3. Lift up the LCD mask gently with the screwdriver blade to loosen the mask from the assembly. Be careful to press upward, not inward toward the LCD. By hand, tilt the LCD mask upward to release. 4. Replace the LCD. The LCD must be centered on the platform between the brackets before you replace the LCD mask. If the LCD is improperly aligned, the display may show missing segments or meaningless readings. 5. Reattach the LCD mask by pressing it over the LCD until it snaps into place. 87 & 89 Series IV Service Manual 14 Reassembling the Meter Case To reassemble the Meter case, do the following: 1. Verify that the rotary switch is in the OFF position. 2. Reinsert the circuit board by placing it into the case top with the LCD showing through the window. Carefully replace the two Phillips-head screws that connect the circuit board to the case top. Caution Do not over-torque the two Phillips-head screws when you reconnect the circuit board to the case top. Doing so may create shielding problems and cause the Meter to give incorrect readings. 3. Hold the Meter face down and place the case bottom on the case top. Make sure the backlight cable located on the back of the LCD assembly is not caught between the case halves. 4. Reinstall the four screws and the battery door. 5. Secure the battery door by turning the fasteners 1/4-turn clockwise. 6. Go to the “Performance Test” section in this document, and perform the procedures described. Testing Fuses (F1 and F2) Before measuring current, test the appropriate fuse as shown in Figure 2. If the tests give readings other than those shown, have the Meter serviced. Warning To avoid electrical shock or personal injury, remove the test leads and any input signals before replacing the battery or fuses. To prevent damage or injury, install ONLY specified replacement fuses with the amperage, voltage, and speed ratings shown in the specifications. Basic Maintenance 15 1000V 400mA FUSED 10A MAX FUSED CAT LOGGING MULTIMETER 89 MIN MAX HOLD REL %msHz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COMV TEMPERATURE A ac+dc AutoHOLD LOGGING SAVE CANCEL FAST MN MX YES NO CLEAR MEM VIEW SETUP 1000V 400mA FUSED 10A MAX FUSED CAT LOGGING MULTIMETER 89 MIN MAX HOLD REL %msHz RANGE dB dB ac+dc ac+dc ac+dc ac+dc F nS mA mA A mV V mV V OFF C A A A A mA COMV TEMPERATURE A ac+dc AutoHOLD LOGGING SAVE CANCEL FAST MN MX YES NO CLEAR MEM VIEW SETUP mA A mA A Replace F2 if or displayed Replace F1 if or displayed tc038f.eps Figure 2. Testing the Current Fuses Replacing Fuses Warning To avoid electrical shock, remove the test leads and any input signals before replacing the battery or fuses. To prevent damage or injury, INSTALL ONLY specified fuses and batteries. To replace the fuses, refer to Figure 3 and do the following: 1. Turn the rotary switch to OFF and remove the test leads from the terminals 2. Remove the battery access door by using a standard-blade screwdriver to turn the battery door fasteners one-quarter turn counterclockwise. 3. Remove either fuse by gently prying one end loose, then lifting the fuse out of the fuse contacts. 4. Install ONLY specified fuses. 5. Reinstall the battery door. Secure the door by turning the fasteners one-quarter turn clockwise. Replacing the Batteries The Meter is powered by four AA batteries (NEDA 15A or IEC LR6). Caution Be sure to observe proper polarity when replacing batteries. Incorrect battery polarity may seriously damage the Meter. To replace the batteries, refer to Figure 3 and do the following: 1. Turn the rotary switch to OFF and remove the test leads from the terminals. 87 & 89 Series IV Service Manual 16 2. Remove the battery door by using a standard-blade screwdriver to the turn the battery door fasteners one-quarter turn counterclockwise. 3. Replace the batteries, observing proper polarity. Replace the battery door and secure it by turning the fasteners one-quarter turn clockwise. F2 F1 tc037f.eps Figure 3. Battery and Fuse Replacement Cleaning Warning To avoid electrical shock or damage to the Meter, never allow water inside the case. To avoid damaging the housing, never apply solvents to the Meter. Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the input terminals can affect readings and can falsely activate the Input Alert feature. Clean the terminals as follows: 1. Turn the Meter off and remove all test leads. 2. Shake out any dirt that may be in terminals. 3. Soak a new swab with alcohol. Clean each terminal with the swab. Performance Tests 17 Performance Tests The following performance tests will ensure that the Meter is in proper operating condition and will check the accuracy of each meter function against its specifications. To perform the tests you will need a Fluke 5520A Calibrator or equipment meeting the minimum specification given in Table 1. If the Meter fails any of these tests, it needs calibration adjustment or repair. Testing the Display Push down the Q button and simultaneously turn the Meter on. Compare the display with the example in Figure 4. Check all segments for clarity and contrast. aau02f.eps Figure 4. Display Test Backlight Test To test the backlight, press the T button twice. Note that the backlight comes on at two different intensity levels. Current Terminal Sensing Test This test determines whether or not the Input Alert beeper is functioning properly. Note Before conducting this test, make sure the beeper is not disabled in setup. 1. Turn the rotary switch to the AC V function. Press the backlight button twice to turn the backlight to the highest intensity. 2. Turn the rotary switch to all functions, except current functions. Note that the beeper does not come on. 3. Turn the rotary switch to the DC mA position. Insert a test lead into th