FLUKE 54II 电路图.pdf

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1、 51, 52, 53, 54 Series II Thermometer Service Manual PN 1276123 October 1999 1999 Fluke Corporation. All rights reserved. Printed in USA All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY a Caution statement identifies conditions and actions that

2、 may damage the thermometer or the test instruments. Thermometer Precautions and Safety Information 3 Safety Information WWarning To avoid electrical shock or personal injury, follow these guidelines: Before using the thermometer, inspect the case. Do not use the thermometer if it appears damaged. L

3、ook for cracks or missing plastic. Pay particular attention to the insulation around the connectors. Disconnect the thermocouple(s) from the thermometer before opening the case. Replace the batteries as soon as the low battery indicator (B) appears. The possibility of false readings can lead to pers

4、onal injury. Do not use the thermometer if it operates abnormally. Protection may be impaired. When in doubt, have the thermometer serviced. Do not operate the thermometer around explosive gas, vapor, or dust. Do not apply more than the rated voltage, as marked on the thermometer, between the thermo

5、couple(s), or between any thermocouple and earth ground. Models 52 and 54: Measurement errors may occur if voltages on the measurement surfaces result in potentials greater than 1 V between the two thermocouples. When potential differences are anticipated between the thermocouples, use electrically

6、insulated thermocouples. When servicing the thermometer, use only specified replacement parts. Do not use the thermometer with any part of the case or cover removed. Caution To avoid damaging the thermometer or the equipment under test: Use the proper thermocouples, function, and range for your ther

7、mometer. Do not attempt to recharge the batteries. To prevent explosion, do not dispose of batteries in fire. Follow local laws or regulations when disposing of batteries. Match the + and polarities of the batteries with the battery case markings. 51, 52, 53, 54 Series II Service Manual 4 Specificat

8、ions General Specifications Weight280 g (10 oz) Dimensions (without holster) 2.8 cm 7.8 cm 16.2 cm (1.1 in 3 in 6.4 in) Battery3 AA batteries CertificationP, ) (TV pending) SafetyCSA C22.2 No. 1010.1 1992 EN 61010 Amendments 1, 2 CAT IOVERVOLTAGE (Installation) CATEGORY I, Pollution Degree 2 per IEC

9、1010-1* * Refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient over voltages to an appropriate low level. Environmental Operating Temperature10 oC to +50 oC

10、 (+14 oF to +122 oF) Storage Temperature40 oC to +60 oC (40 oF to +140 oF) Humidity Non Condensing ( +10 oC) ( +50 oF) 95% RH (+10 oC to +30 oC) (+50 oF to +86 oF) 75% RH (+30 oC to +40 oC) (+86 oF to +104 oF) 45% RH (+40 oC to +50 oC) (+104 oF to +122 oF) (Without Condensation) Electrical Measureme

11、nt Range J-type: 210 oC to +1200 oC (346 oF to +2192 oF) K-type: 200 oC to +1372 oC (328 oF to +2501 oF) T-type: 250 oC to +400 oC (418 oF to +752 oF) E-type: 150 oC to +1000 oC (238 oF to +1832 oF) N-type: 200 oC to +1300 oC (328 oF to +2372 oF) R- and S-type: 0 oC to +1767 oC (+32 oF to +3212 oF)

12、Display Resolution 0.1 oC / oF / K 1000o 1.0 oC / oF / K 1000o Measurement Accuracy J-, K-, T-, E-, and N-type: 0.05 % of reading + 0.3 oC (0.5 oF) below 100 oC (148 oF): add 0.15 % of reading for J, K, E, and N; and 0.45 % of reading for T R- and S-type: 0.05 % of reading + 0.4 oC (+0.7 oF) Tempera

13、ture Coefficient 0.01 % of reading + 0.03 oC per oC (0.05 oF per oF) outside the specified +18 oC to +28 oC (+64 oF to +82 oF) range below 100 oC (148 oF): add 0.04 % of reading for J-, K-, E-, and N-type; and 0.08 % of reading for T-type Electromagnetic Compatibility Susceptibility: 2 oC ( 3.6 oF)

14、for 80 MHz to 200 MHz in 1.5 v/m field, for 200 MHz to 1000 MHz in 3 V/m field. Emissions: Commercial limits per EN50081-1 Maximum Differential Common Mode Voltage1 V (Maximum voltage difference between T1 and T2) Temperature ScaleITS-90 Applicable StandardsNIST-175 Accuracy is specified for ambient

15、 temperatures between +18 oC (+64 oF) and +28 oC (+82 oF) for a period of 1 year. The above specifications do not include thermocouple error. Thermometer Performance Test and Calibration Required Test Equipment 5 Performance Test and Calibration Required Test Equipment Refer to Table 2 for a list of

16、 test equipment used in the performance test and calibration procedures. Table 2. Recommended Test Equipment EquipmentRequired CharacteristicsRecommended Model DC Voltage Calibrator Output Voltage: 0-1V Accuracy: 0.0125 % Resolution: 0.1 VFluke 5700A or equivalent Thermocouple connector For K-type t

17、hermocouple Fluke 80CK-M Fluke P/N 779942 Thermocouple connectorCopperFluke P/N 601747 K-type Thermocouple wireStandardOmega Dewar Flask/Cap1- pint, or larger capacityThermos Mercury Thermometer (either C or F) 0.02 C Resolution 0.05 F Resolution Princo Model ASTM56C Princo Model ASTM56F DB9 Adapter

18、 ConnectorFluke P/N 804549 IR AdapterFluke P/N 690518 PC with Microsoft Windows installed Performance Tests Performance tests are recommended for incoming inspection, periodic maintenance, and for checking the thermometers specifications. If the thermometer fails any part of the performance tests, c

19、alibration and/or repair is indicated. Before performing these tests: 1. Allow the thermometer to stabilize to room temperature, +23 oC 5 oC (+73 oF 9 oF). 2. Check the batteries and replace them if necessary. Display Test Turn the thermometer on while pressing the h button. All display segments are

20、 displayed until the h button is released. Confirm that all the display segments are showing as in Figure 1. 51, 52, 53, 54 Series II Service Manual 6 52 51 54 53 zb03f.eps Figure 1. Display Segments Keypad Test Check that all keypad switches are functional by pressing each key and confirming the pr

21、oper response on the display. Wide Range Performance Test Procedure This test verifies the instrument specifications. If the instrument fails this test, perform the calibration procedure. If the unit continues to fail, it should be taken to a Fluke service center. Ice Bath Construction To begin the

22、performance test, first construct an ice bath as follows: 1. Prepare a Dewar Flask by drilling two holes in its cap to accept the Mercury thermometer and thermocouple wires, or use a standard laboratory cork. 2. Fill the Dewar Flask with shaved or crushed ice made from distilled water. 3. Fill the D

23、ewar Flask with enough distilled water so that the ice turns to slush, but do not add enough water to float the ice. Note As the ice melts, siphon off the excess water and add more ice. Allow approximately 5 to 10 minutes for the water to drop back to the freezing point. Thermometer Performance Test

24、s 7 4. Replace the Dewar Flask cap or cork, and insert the thermocouple wires and Mercury thermometer as shown in Figure 2. Insert the Mercury thermometer to the same depth as the thermocouple wire. 5700A Calibrator Ice bath K-Type Thermocouple wire Copper wire 51, 52, 53, or 54 Series II Thermomete

25、r K-Type Thermocouple connector _ - + _ - + + - Mercury Thermometer zb04f.eps Figure 2. Ice Bath Test Equipment Connections Ice Bath Test Use the following procedure to test the thermometer. If the thermometer has two inputs, this test should be conducted on both thermocouple inputs. 1. If not alrea

26、dy selected, select K-type thermocouple on the thermometer using the D, K, N, and E buttons. 2. Connect the equipment as shown in Figure 2. Allow the setup to thermally stabilize at least 5 minutes after inserting the thermocouple into the thermometer. 3. Verify that the ice bath temperature reads 0

27、.0 oC 0.06 oC on the Mercury thermometer. 4. Short (or apply 0 mV) to the copper wires at the Calibrator. 5. Verify the thermometer reads 0.0 oC 0.3 oC. 6. If this test fails, reposition the thermocouple wires and Mercury thermometer to the same depth in the ice bath, and repeat steps 3-5. If the te

28、st continues to fail, perform the calibration procedure, located after this procedure. 7. Remove the short applied in step 4. 8. Using Table 3, steps 2-5, obtain an output from the Calibrator equal to the values in the “Input Voltage (mV DC)” column, and verify the thermometer reads within the limit

29、s specified. If any step fails, perform the calibration procedure located later in this section. 9. Disconnect the thermocouple from the input terminals. This completes the ice bath test. 51, 52, 53, 54 Series II Service Manual 8 Table 3. Performance Test Values (K-Type Thermocouple) Input Voltage E

30、quivalentDisplay Reading limits Step(mV DC)Temperature CF 10.00000.0 C32.0 F-0.3 to 0.331.5 to 32.5 20.919323.0 C73.4 F22.7 to 23.372.9 to 73.9 3-5.7297-190.0 C-310.0 F-189.3 to -190.7-308.9 to -311.1 440.8853990.0 C1814 F989.2 to 990.81813 to 1815 548.83821200 C2192 F1199 to 12012190 to 2194 Verifi

31、cation of IR Communications Port (Fluke 53 and 54) This section explains how to verify the operation of the IR Communications Port (IR port). Perform the following procedure using a PC and HyperTerminal. The IR port can also be verified using Flukeview software. To set up a HyperTerminal file, follo

32、w these steps: 1. Connect the IR adapter cable to the DB9 Adapter connector. Connect the other end of the DB9 Adapter to a COM port of the PC. 2. Place the Fluke 53 or 54 in front of the IR adapter. 3. Open up a HyperTerminal session. Select Start button, Programs, Accessories, HyperTerminal. 4. Ope

33、n up a New Connection with a name like “Fluke 54 IR Test”. 5. When the Connect To box appears, select the COM1 or COM2 (the port that the IR adapter cable is plugged into). 6. Select Port Settings: 9600 baud rate, 8 data bits, no parity, 1 stop bit, and no flow control. 7. Under File, select propert

34、ies. Verify that the correct port is selected. Click on Configure. Verify that port settings are correct (the baud rate may need to be changed to 9600). 8. Select the Settings tab then click on ASCII Setup. Check the following boxes: Echo typed characters locally Append line feeds to incoming line e

35、nds Wrap lines that exceed terminal width To open a HyperTerminal file to test the IR port, use the following procedure: 1. Under File, select Save As. Use a file name such as “Fluke 54 IR Test” and then click on save. 2. Click on the phone disconnect icon. 3. Click on open folder or under File sele

36、ct Open. Double click on Fluke 54 IR Test. 4. Type in ID followed by the Enter key (notice the ID is capitalized). 5. The display of the thermometer now shows the thermometer name (Fluke 53-II or Fluke 54-II), and the units operating software version (e.g. Fluke 54-II, V1.01). Thermometer Calibratio

37、n and Offset Adjustment 9 Calibration and Offset Adjustment Calibration consists of two parts: 1. Calibration of the A/D converter, using the set up shown in Figure 3. 2. Reference junction calibration, using the ice bath test set up shown in Figure 2. A/D Calibration To calibrate the A/D portion of

38、 the thermometer, follow these steps: 1. Connect the calibrator to the T1 input of the thermometer using copper (non- thermocouple) wire and a copper thermocouple connector. Refer to Figure 3 for proper equipment connections. 2. Turn the thermometer on, with a small, blunt probe, press the calibrati

39、on button located on the back and in the center of the thermometer. Refer to Figure 4. 5700A Calibrator 51, 52, 53, or 54 Series II Thermometer Copper wire Copper Thermocouple connector + - _ - + zb06f.eps Figure 3. Calibration Connections 51, 52, 53, 54 Series II Service Manual 10 Calibration butto

40、n access zb02f.eps Figure 4. Calibration Button Access 3. The menu on the display changes to “CAL A-d”. Note Within CAL are four menu options that may be accessed by pressing E: CAL A-d prompts the operator for the A/D calibration inputs in mV dc. CAL rEF allows the operator to calibrate the referen

41、ce junction at a known temperature. CAL donE saves the new calibration constants in memory. CAL Abrt ignores calibration changes (turning the thermometer off while in CAL will also ignore calibration changes). 4. Press K or N to select different menu options. 5. With CAL A-d selected, press E. The t

42、hermometer prompts “80”. Set the calibrator to +80.000 mV and allow the output to stabilize. Note For steps 6 and 8, keep hand and body motion to a minimum while the thermometer takes A/D readings. 6. Press E. Wait while it takes A/D readings. 7. When the thermometer prompts for “-8”, set the Calibr

43、ator to -8.0000 mV. Allow the output to stabilize. 8. Press E on the thermometer and wait while it takes A/D readings. The thermometer now shows the measured value in the bottom portion of the display. Millivolts appears on the left side and microvolts appears on the right side. 9. If the measuremen

44、t is from 7 995.0 to 8 005.0, press E and the meter will return to the calibration menu and display CAL rEF. If the measurement is outside 7995.0 to 8005.0, press E once to return to the calibration menu. Using K or N, select CAL A-d and try the A/D calibration procedure a second time starting at st

45、ep 5. 10. Using K or N, select “CAL donE”, then press E to store the calibration in memory. Thermometer Calibration and Offset Adjustment 11 11. To ignore the calibration changes, use K or N, and select “CAL Abrt” and press E. 12. Proceed to Reference Junction Calibration. Reference Junction Calibra

46、tion Note This procedure is described using an ice bath and a K-type thermocouple. It can be performed in C, F, or K with any thermocouple and a known, accurate temperature between 0 C (+32 F) and +50 C (+122 F). Note It is important that the temperature of the thermocouple and the internal temperat

47、ure of the thermometer (the reference junction) have stabilized. To calibrate the reference junction, follow these steps: 1. Prepare an ice bath (described earlier in this section). 2. Referring to Figure 2, connect the equipment to T1 using K-type thermocouple wire and a K-type thermocouple connect

48、or. Allow the setup to thermally stabilize at least 5 minutes after inserting the thermocouple connector into the thermometer. 3. Turn the thermometer on and select the thermocouple type using the D, K, N, and Ebuttons. 4. Enter calibration mode (refer to the “A/D Calibration” section, step 2). 5. U

49、sing K or N, select CAL rEF and press E. 6. Press K or N until the upper display matches the known temperature. Note Once adjusted, do not change units (C, F, or K) until the thermometer is in measurement mode. 7. Press the E button. 8. “CAL donE”appears then press E to store the calibration in memory. 9. To ignore the calibration changes, use the K or N, and select “CAL Abrt” and press E. Using the Offset to Adjust for Variation Between Thermocouples Use the offset option in the thermometer SETUP mode to