FLUKE 5520a 电路图.pdf

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1、 5520A Multi-Product Calibrator Service Manual PN 802303 April 1999 Rev. 1, 12/02 1999, 2002 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies RadioFans.CN 收音机爱 好者资料库 LIMITED WARRANTY ANSI/ISA-S82.01-1994; CAN/CSA-C22.2 No. 1010.

2、1-92 Analog Low Isolation20 V EMCDesigned to comply with FCC Rules Part 15; VFG 243/1991. If used in areas with Electromagnetic fields of 1 to 3 V/m, resistance outputs have a floor adder of 0.508 . Performance not specified above 3 V/m. This instrument may be susceptible to electro-static discharge

3、 (ESD) from direct contact to the binding posts. Good static aware practices should be followed when handling this and other pieces of electronic equipment. Line Power 2 Line Voltage (selectable): 100 V, 120 V, 220 V, 240 V Line Frequency: 47 Hz to 63 Hz Line Voltage Variation: 10% about line voltag

4、e setting Power Consumption5500A Calibrator, 300 VA; 5725A Amplifier, 750 VA Dimensions5500A Calibrator: Height: 17.8 cm (7 inches), standard rack increment, plus 1.5 cm (0.6 inch) for feet on bottom of unit; Width: 43.2 cm (17 inches), standard rack width Depth: 47.3 cm (18.6 inches) overall 5725A

5、Amplifier: Height, 13.3 cm (5.25 inches), standard rack increment, plus 1.5 cm (0.6 inch) for feet on bottom of unit; Width, 43.2 cm (17 inches), standard rack width Depth, 63.0 cm (24.8 inches) overall. Weight (without options)5500A Calibrator, 22 kg (49 lb); 5725A Amplifier 32 kg (70 pounds) Absol

6、ute Uncertainty DefinitionThe 5500A specifications include stability, temperature coefficient, linearity, line and load regulation, and the traceability of the external standards used for calibration. You do not need to add anything to determine the total specification of the 5520A for the temperatu

7、re range indicated. Specification Confidence Interval 99% 1 After long periods of storage at high humidity, a drying out period (with the power on) of at least one week may be required. 2 For optimal performance at full dual outputs (e.g. 1000 V, 20A) choose a line voltage setting that is 7.5% from

8、nominal. 3 The DC Current ranges 0 to 1.09999 A and 1.1 A to 2.99999 A are sensitive to storage temperatures above 50 C. If the 5520A is stored above 50 C for greater than 30 minutes, these ranges must be re-calibrated. Otherwise, the 90 day and 1 year uncertainties of these ranges double. 5520A Ser

9、vice Manual 1-8 1-10. DC Voltage Specifications Absolute Uncertainty, tcal 5 C (ppm of output + V) Stability Resolution Max Burden Range90 days1 year 24 hours, 1 C (ppm output + V) V1 0 to 329.9999 mV15 + 120 + 13 + 10.150 0 to 3.299999 V9 + 211 + 22 + 1.5110 mA 0 to 32.99999 V10 + 2012 + 202 + 1510

10、10 mA 30 V to 329.9999 V15 + 15018 + 1502.5 + 1001005 mA 100 V to 1000.000 V15 + 150018 + 15003 + 30010005 mA Auxiliary Output (dual output mode only) 2 0 to 329.999 mV300 + 350400 + 35030 + 10015 mA 0.33V to 3.29999V300 + 350400 + 35030 + 100105 mA 3.3 V to 7 V300 + 350400 + 35030 + 1001005 mA TC S

11、imulate and Measure in Linear 10 V/C and 1 mV/C modes 3 0 to 329.999 mV40 + 350 + 35 + 20.110 1Remote sensing is not provided. Output resistance is 5 m for outputs 0.33 V. The AUX output has an output resistance of 1. TC simulation has an output impedance of 10 1 . 2Two channels of dc voltage output

12、 are provided. 3 TC simulating and measuring are not specified for operation in electromagnetic fields above 0.4 V/m. Noise Range Bandwidth 0.1 Hz to 10 Hz p-p (ppm output + floor) Bandwidth 10 Hz to 10 kHz rms 0 to 329.9999 mV0 + 1 V6 V 0 to 3.299999 V0 + 10 V60 V 0 to 32.99999 V0 + 100 V600 V 30 t

13、o 329.9999 V10 + 1 mV20 mV 100 to 1000.000 V10 + 5 mV20 mV Auxiliary Output (dual output mode only) 1 0 to 329.999 mV0 + 5 V20 V 0.33 V to 3.29.999 V 0 + 20 V200 V 3.3 V to 7 V0 + 100 V1000 V 1Two channels of dc voltage output are provided. Introduction and Specifications Specifications1 1-9 1-11. D

14、C Current Specifications Absolute Uncertainty, tcal 5 C (ppm of output + A) Range 90 days1 year Resolution Max Compliance Voltage V Max Inductive Load mH 0 to 329.999 mA120 + 0.02150 + 0.021 nA10 0 to 3.29999 mA80 + 0.05100 + 0.050.01 mA10 0 to 32.9999 mA80 + 0.25100 + 0.250.1 mA 7 0 to 329.999 mA80

15、 + 2.5100 + 2.51 mA 7400 0 to 1.09999 A160 + 40200 + 4010 mA 6 1.1 to 2.99999 A300 + 40380 + 4010 mA 6 0 to 10.9999 A (20 A Range)380 + 500500 + 500100 mA4 11 to 20.5 A 1800 + 750 21000 + 750 2 100 mA 4 1 Duty Cycle: Currents 11 A, see Figure 1-4. The current may be provided 60-T-I minutes any 60 mi

16、nute period where T is the temperature in C (room temperature is about 23 C) and I is the output current in amperes. For example, 17 A, at 23 C could be provided for 60-17-23 = 20 minutes each hour. 2 Floor specification is 1500 A within 30 seconds of selecting operate. For operating times 30 second

17、s, the floor specification is 750 A. Noise Range Bandwidth 0.1 Hz to 10 Hz p-p Bandwidth 10 Hz to 10 kHz rms 0 to 329.999 A2 nA20 nA 0 to 3.29999 mA20 nA200 nA 0 to 32.9999 mA200 nA2.0 A 0 to 329.999 mA2000 nA20 A 0 to 2.99999 A20 A1 mA 0 to 20.5 A200 A10 mA 5520A Service Manual 1-10 DC Current Spec

18、ifications (cont) Ambient 0 C 20 C 10 C 30 C 40 C Current (Amps) Minutes per Hour Duty Cycle (%) 0% 10% 20% 30% 40% 60% 70% 80% 50% 5 10 15 20 25 30 35 40 45 50 0 11121314151617181920 nn326f.eps Figure 1-4. Allowable Duration of Current 11 A Introduction and Specifications Specifications1 1-11 1-12.

19、 Resistance Specifications Range Absolute Uncertainty, tcal 5 C (ppm of output + floor) 2 ResolutionAllowable 1ppm of output Floor Time see Chapter 6. The Control Display prompts you through the entire calibration procedure. Calibration occurs in the following major steps: 1. The 5520A sources speci

20、fic output values and you measure the outputs using traceable measuring instruments of higher accuracy. The 5520A automatically programs the outputs and prompts you to make external connections to appropriate measurement instruments. 2. At each measure and enter step, you can press the OPTIONS, and

21、BACK UP STEP softkeys to redo a step, or SKIP STEP to skip over a step. 3. You enter the measured results either manually through the front panel keyboard or remotely with an external terminal or computer. Note Intermixed with the output and measure procedures are internal 5520A calibration procedur

22、es that require no action by the operator. 4. The 5520A computes a software correction factor and stores it in volatile memory. 5. When the calibration process is compete, you are prompted to either store all the correction factors in nonvolatile memory or discard them and start over. For routine ca

23、libration, all steps except frequency and phase are necessary. All the routine calibration steps are available from the front panel interface as well as the remote interface (IEEE-488 or serial). Frequency and phase calibration are recommended after instrument repair, and are available only by way o

24、f the remote interface (IEEE-488 or serial). Remote commands for calibration are described later in this chapter. 3-4. Starting Calibration From the front panel, you start calibration by pressing the S key, followed by the CAL softkey twice, then 5520A CAL. The CALIBRATION SWITCH on the 5520A rear p

25、anel can be in either position when you begin calibration. It must be set for ENABLE to store the correction factors into nonvolatile memory. After you press the 5520A CAL softkey, the procedure works as follows: 1. The 5520A automatically programs the outputs and prompts you to make external connec

26、tions to appropriate measurement instruments. 2. The 5520A then goes into Operate mode, or asks you to place it into Operate mode. 3. You are then prompted to enter into the 5520A the value read on the measurement instrument. Note At each measure and enter step, you can redo a step by pressing the O

27、PTIONS, and BACK UP STEP softkey, or skip over a step by pressing the SKIP STEP softkey. 5520A Service Manual 3-6 3-5. DC Volts Calibration (NORMAL Output) The equipment listed in Table 3-2 is required for calibration of the dc volts function. (The equipment is also listed in the consolidated table,

28、 Table 3-1.) Table 3-2. Test Equipment Required for Calibrating DC Volts Quan.ManufacturerModelEquipment 1Fluke5500A/LEADSTest lead set 1Hewlett Packard3458A with -002 OptionDMM 1Fluke752AReference Divider 1Keithley155Null Detector Proceed as follows to calibrate the dc voltage function: 1. On the H

29、P 3458A, perform the ACAL (autocal) ALL and MATH NULL functions as described in the HP 3458A user documentation. 2. Verify that the UUT (Unit Under Test) is in Standby. 3. Start 5520A calibration as described under the previous heading. 4. Perform an internal DC Zeros Calibration as prompted. 5. Con

30、nect the test equipment as shown in Figure 3-1. 6. Measure and enter the values into the UUT for steps 1 through 6 in Table 3-3 as prompted. You will need to disconnect and reconnect the DMM as prompted during these steps. 7. Verify that the UUT is in Standby. 8. Connect the DMM and Reference Divide

31、r to the UUT as shown in Figure 3-2. 9. For voltages 30 Vdc and above, see the next section. Calibration and Verification Calibration3 3-7 Table 3-3. Calibration Steps for DC Volts Step5520A Output (NORMAL) 11.000000 V 23.000000 V 3-1.000000 V 4-3.000000 V 50.0000 mV 6300.0000 mV 730.00000 V 8300.00

32、00 V 91000.000 V HI LO TRIG GUARD TC 20A 1000V RMS MAX 20V RMS MAX 20V PK MAX 1V PK MAX SHELLS NOT GROUNDED NORMALAUXSCOPE OUT V, , ,RTDA, -SENSE, AUX V 150V PK MAX 20V RMS MAX 20V PK MAX20V PK MAX 5520ACALIBRATOR HP3458A UUT Set the HP3458A to external guard yg102f.eps Figure 3-1. Connections for C

33、alibrating DC Volts up to 30 V 3-6. DC Volts Calibration (30 Vdc and Above) Use the following procedure to calibrate the dc voltage function (30 Vdc and above). 1. Prior to using the 752A, perform the self-calibration on the 752A using the null detector and a 20 V source. See the documentation from

34、the 752A for more details. 2. Connect the 5520A (unit under test), 752A, and HP3458A as in Figure 3-2. Make sure that the ground to guard strap on the 752A is not connected. 3. The HP3458A should be used on the 10 Vdc range for all measurements. The 752A mode switch should be set to 10:1 for the 30

35、V measurement, and to 100:1 for all voltages above 30 V. 4. Measure and enter the values into the UUT for steps 7 through 9 in Table 3-3 (30 V and above) as prompted. 5. Verify that the UUT is in Standby and disconnect the test equipment. 5520A Service Manual 3-8 HI LO TRIG GUARD TC 20A 1000V RMS MA

36、X 20V RMS MAX 20V PK MAX 1V PK MAX SHELLS NOT GROUNDED NORMALAUXSCOPE OUT V, , ,RTDA, -SENSE, AUX V 150V PK MAX 20V RMS MAX 20V PK MAX20V PK MAX 5520ACALIBRATOR HP3458A Set the HP3458A to external guard 752A UUT HI LO TRIG GUARD TC 20A 1000V RMS MAX 20V RMS MAX 20V PK MAX 1V PK MAX SHELLS NOT GROUND

37、ED NORMALAUXSCOPE OUT V, , ,RTDA, -SENSE, AUX V 150V PK MAX 20V RMS MAX 20V PK MAX20V PK MAX yg103f.eps Figure 3-2. Connections for Calibrating DC Volts 30 V and Above 3-7. AC Volts Calibration (NORMAL Output) The equipment listed in Table 3-4 is required for calibration of the ac volts function. (T

38、he equipment is also listed in the consolidated table, Table 3-1.) Table 3-4. Test Equipment Required for Calibrating AC Volts Quan.ManufacturerModelEquipment 1Fluke5500A/LEADSTest lead set 1FlukePN 900394Type N to dual banana adapter 1Fluke5790AAC Measurement Standard Proceed as follows to calibrat

39、e the ac voltage function: 1. Measure the 5520A output using Input 1 of a Fluke 5790A AC Measurement Standard. Use a Type N to dual banana adapter as Figure 3-3 shows. 2. Enter the measured values into the 5520A for each step in Table 3-5 as prompted. Calibration and Verification Calibration3 3-9 Ta

40、ble 3-5. Calibration Steps for AC Volts 5520A Output (NORMAL) Step AmplitudeFrequency 13.29990 V100.00 Hz 20.33000 V100.00 Hz 33.00000 V500.0 kHz 43.0 V9.99 Hz 530.000 mV100.00 Hz 6300.000 mV100.00 Hz 7300.000 mV500.0 kHz 830.0000 V100.00 Hz 9300.000 V70.00 kHz 101000.00 V100.00 Hz 111000.00 V7.000

41、kHz HI LO TRIG GUARD TC 20A 1000V RMS MAX 20V RMS MAX 20V PK MAX 1V PK MAX SHELLS NOT GROUNDED NORMALAUXSCOPE OUT V, , ,RTDA, -SENSE, AUX V 150V PK MAX 20V RMS MAX 20V PK MAX20V PK MAX 5520ACALIBRATOR UUT5790A 5790A AC MEASUREMENT STANDARD 1000V RMS MAX1000V RMS MAX 3V RMS MAX INPUT 1INPUT 2 SHUNT H

42、I LO GUARDGROUND SHELL FLOATING 10V PEAK MAX WIDEBAND 7V RMS MAX MAX 10V PK SHELL FLOATING Set the 57900A to external guard yg104f.eps Figure 3-3. Connections for Calibrating AC Volts 5520A Service Manual 3-10 3-8. Thermocouple Function Calibration The equipment listed in Table 3-6 is required for c

43、alibration of the thermocouple measure and source functions. (The equipment is also listed in the consolidated table, Table 3-1.) Table 3-6. Test Equipment Required for Calibrating the Thermocouple Function Quan.ManufacturerModelEquipment 1Fluke5520A/LEADSTest lead set (includes Type-J thermocouple,

44、 wire, and mini plug) 4 feetvariousvarious24-gauge solid copper telephone wire 1ASTM56CMercury thermometer 1variousvariousDewar flask and cap, mineral oil lag bath 1Hewlett Packard3458A with -002 optionDMM Proceed as follows to calibrate the thermocouple function: 1. Verify that the UUT is in standb

45、y. 2. With nothing connected to the UUT terminals, press the GO ON softkey as prompted to start TC calibration. Wait for the internal calibration steps to complete. 3. Connect the HP3458A DMM to the TC terminals using solid copper telephone wire and a copper (uncompensated) TC miniplug as shown in F

46、igure 3-4. Attach the wires directly to the DMM binding posts. Set the DMM to read dc millivolts. 4. Enter the measured value into the UUT for step 1 in Table 3-7 as prompted. 5. Disconnect the test equipment. 6. Connect a Type-J thermocouple to the TC terminals on the UUT, and immerse the thermocou

47、ple and a precision mercury thermometer in a mineral oil lag bath that is within 2 C of ambient temperature. The test setup is shown in Figure 3-5. 7. Wait at least 3 minutes for the temperature readings to stabilize, then read the temperature on the mercury thermometer and enter it into the UUT. Ta

48、ble 3-7. Calibration Steps for Thermocouple Measurement Step5520A Output (AUX HI, LO) 1300 mV dc (NORMAL) 2Enter temperature read from mercury thermometer as prompted Calibration and Verification Calibration3 3-11 HI LO TRIG GUARD TC 20A 1000V RMS MAX 20V RMS MAX 20V PK MAX 1V PK MAX SHELLS NOT GROU

49、NDED NORMALAUXSCOPE OUT V, , ,RTDA, -SENSE, AUX V 150V PK MAX 20V RMS MAX 20V PK MAX20V PK MAX 5520ACALIBRATOR UUT HP3458A Attach wires directly to binding posts yg105f.eps Figure 3-4. Connections for Calibrating Thermocouple Sourcing POWER I O 0 123 456 789 ENTER M k mVHz FIELD EDIT /+ F OPREARTHSCOPEBOOSTMENU PREV SHIFT RESET CE SETUP REF NEW TC MEAS F n p W dBmsec CA MULT x DIV OUT TRIG 5520ACALIBRATOR STBY UUT Dewar Flask and Cap Mineral Oil Lag Bath J type Thermocouple Mercury Thermometer HI LO TRIG GUARD TC 20A 1000V RMS M