FLUKE 5820a 电路图.pdf

5820A Oscilloscope Calibrator Service Manual PN 673142 June 1999 Rev.2, 11/06 1999-2006 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. 1010.1-92 Output Impedance The 5820A is designed to drive both 50 e and 1 Me loads Analog Low Isolation 20 V EMC Complies with EN 61326-1 Line Voltage (selectable): 100 V, 120 V, 220 V, 240 V Line Frequency: 47 to 63 Hz Line Power Line Voltage Variation: 10 % about line voltage setting Power Consumption 250 VA 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 Dimensions Depth: 47.3 cm (18.6 inches) overall Weight 20 kg (44 pounds) Absolute Uncertainty Definition The 5820A 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 5820A for the temperature 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. 5820A Service Manual 1-8 1-8. Voltage Output Specifications Volt Function DC Signal Square Wave Signal 1 Load into 50 e e into 1 Me e into 50 e e into 1 Me e Amplitude Characteristics 0 V to 6.6 V 0 V to 130 V 1 mV to 6.6 V p-p 1 mV to 130 V p-p Range Resolution 1 mV to 24.999 mV 1 V 25 mV to 109.99 mV 10 V 110 mV to 2.1999 V 100 V 2.2 V to 10.999 V 1 mV 11 V to 130 V 10 mV Adjustment Range Continuous 1-Year Absolute Uncertainty, tcal 5 C 0.25 % of output +40 V) 0.025 % of output +25 V) 0.25 % of output +40 V) 0.05 % of output +5 V) 2 Sequence 1-2-5 (e.g., 10 mV, 20 mV, 50 mV) Square Wave Frequency Characteristics Range 10 Hz to 10 kHz 1-Year Absolute Uncertainty, tcal 5 C (0.33 ppm of setting) Typical Aberration (from 50 % of leading/trailing edge) 25 mV to 130 V: within 4 s 10 mV to 25 mV: within 8 s 1 mV to 10 mV: within 14 s 1 Me input impedance (measure voltage across 1 Me input resistor) Introduction and Specifications Specifications 1 1-9 1-10. Edge Specifications Note The GHz Option offers a Fast Edge function. The specifications for the Fast Edge function can be found in Chapter 8 of the 5820A Operators Manual. Edge Characteristics into 50 e e load 1 Year Absolute Uncertainty, tcal 5 C Rise Time 300 ps 0/- 100 ps Amplitude Range (p-p) 4.0 mV to 2.5 V (2 % of output +200 V) Resolution 4 digits Adjustment Range 10 % around each sequence value (indicated below) Sequence Values 5 mV, 10 mV, 25 mV, 50 mV, 60 mV, 80 mV, 100 mV, 200 mV, 250 mV, 300 mV, 500 mV, 600 mV, 1 V, 2.5 V Frequency Range 1 kHz to 10 MHz (0.33 ppm of setting) Typical Jitter, edge to trigger < 3 ps (p-p) within 2 ns from 50 % of rising edge < (3 % of output + 2 mV) 2 to 5 ns < (2 % of output + 2 mV) Leading Edge Aberrations 2 5 to 30 ns < (1 % of output + 2 mV) after 30 ns 600 MHz) table in Chapter 8 of the 5820A Operators Manual. Frequency Range Leveled Sine Wave Characteristics into 50 e e 50 KHz (reference) 50 KHz to 100 MHz 100 MHz to 300 MHz 300 MHz to 500 MHz 500 MHz to 600 MHz Amplitude Characteristics Range (p-p) 5 mV to 5.0 V 1 V p-p 1 1 V p-p 1 1 V p-p 1 1 V p-p 1 1 V p-p Typical Jitter (p-p) < 10 ppm < 1 ppm < 1 ppm < 1 ppm < 1 ppm Sequence 5-2-1 from 5 s to 2 ns (e.g., 500 ms, 200 ms, 100 ms) Adjustment Range At least 10 % around each sequence value indicated above Amplitude Resolution 4 digits 1-Year Absolute Uncertainty, tcal 5 C 1 (2.5 ppm + 5 Hz) 20.33 ppm 0.33 ppm 0.33 ppm 0.33 ppm 1 Time marker uncertainty is 50 ppm when measured off of cardinal points: 5 s, 2 s, 1 s, 500 ms, 200 ms, 100 ms, 50 ms, 20 ms, 10 ms, 5 ms, 2 ms, 1 ms, 500 s, 200 s, 100 s, 50 s, 20 s, 10 s, 5 s, 2 s, 1 s, 500 ns, 200 ns, 100 ns, 50 ns, 20 ns, 10 ns, 5 ns and 2 ns. 2 As an example, a 5s 0.2 Hz marker would have an uncertainty of: 0.2 Hz * 2.5 ppm + 5 Hz = 5.5 Hz. The valid values are 0.2000055 to 0.1999945 Hz or 4.9998625 s to 5.0001375 s. Introduction and Specifications Specifications 1 1-11 1-13. Wave Generator Specifications Wave Generator Characteristics Square Wave and Sine Wave into 50 e e or 1 Me e Triangle Wave into 50 e e or 1 Me e Amplitude into 1 Me: 1.8 mV to 55 V p-p into 1 Me: 1.8 mV to 55 V p-p Range into 50 e: 1.8 mV to 2.5 V p-p into 50 e: 1.8 mV to 2.5 V p-p 1-Year Absolute Uncertainty, tcal 5 C, 10 Hz to 10 kHz (3 % of p-p output + 100 V) (3 % of p-p output + 100 V) Sequence 1-2-5 (e.g., 10 mV, 20 mV, 50 mV) 1-2-5 (e.g., 10 mV, 20 mV, 50 mV) Typical DC Offset Range 0 to (40 % of p-p amplitude) 1 0 to (40 % of p-p amplitude) 1 Ramp Linearity 2 Better than 0.1 % 10 Hz to 10 kHz 3 Frequency Range 0.01 Hz to 100 kHz 0.01 Hz to 100 kHz Resolution 4 or 5 digits depending upon Frequency 4 or 5 digits depending upon Frequency 1-Year Absolute Uncertainty, tcal 5 C 5 (2.5 ppm + 5 Hz) 4 (2.5 ppm + 5 Hz) 4 1 The DC offset plus the wave signal must not exceed 30 V rms. 2 Applies to the 10 % to 90 % of the triangle waveform 500 mV p-p to 10 V p-p. 3 No specification below 10 Hz or above 10 kHz. 4 With 10 MHz external reference selected, the uncertainty becomes that of the external clock plus 5 Hz. 5 Uncertainties below 10 Hz are typical. 6 Square wave rise/fall time typically less than 500 ns. 1-14. 1 ns Pulse Generator Specifications Pulse Generator Characteristics Positive pulse into 50 e e Typical Rise/fall Time 500 ps Typical Available Amplitudes 1.5 V, 600 mV, 150 mV, 60 mV, 15 mV Pulse Width Range 1 1 ns to 500 ns Uncertainty 5 % 200 ps Pulse Period Pulse width < 1 ns 20 ms to 200 ns 1 ns Pulse width 9.9 ns 20 ms to 200 ns 10 ns Pulse width 79.9 ns 20 ms to 2 s 80 ns Pulse width 500 ns 20 ms to 10 s Resolution 4 or 5 digits depending upon frequency and width 1-Year Absolute Uncertainty, tcal 5 C 0.33 ppm Pulse Skew with Trigger 3 Range 2 +30 ns to -10 ns with 250 ps resolution Uncertainty 4 500 ps 1 May generate pulses below 1 ns but pulse width accuracy is not specified 2 Assumes that trigger is used in divide by 1 mode. Other divide modes are not specified. 3 Pulse skew measured from 30 % of trigger signal amplitude to 30 % of pulse range amplitude. 4 Uncertainty specification applies only for pulse periods that are 3 s or greater in duration. Otherwise, skew uncertainty is typical. 1-15. Trigger Signal Specifications (Pulse Function) Pulse Period Division Ratio Amplitude into 50 e e (p-p) Typical Rise Time 20 ms to 200 ns off/1/10/100 1 V 2 ns ok Skew between Pulse and Trigger programmable from -10 ns to +30 ns 5820A Service Manual 1-12 1-16. Trigger Signal Specifications (Time Marker Function) Time Marker Period Division Ratio Amplitude into 50 e e (p-p) Typical Rise Time 5 s to 35 ms off/1 1 V 2 ns 34.9 ms to 750 ns off/1/10/100 1 V 2 ns 749 ns to 7.5 ns off/10/100 1 V 2 ns 7.5 ns to 2 ns off/100 1 V 2 ns 1-17. Trigger Signal Specifications (Edge Function) Edge Signal Frequency Division Ratio Typical Amplitude into 50 e e (p-p) Typical Rise Time Typical Lead Time 1 kHz to 10 MHz off/1 1 V 2 ns 40 ns 1-18. Trigger Signal Specifications (Square Wave Voltage Function) AC Voltage Frequency Division Ratio Typical Amplitude into 50 e e (p-p) Typical Rise Time Typical Lead Time 10 Hz to 10 kHz off/1 1 V 2 ns 2 s 1-19. Trigger Signal Specifications (TV) Trigger Signal Type Parameters Frame Formats Selectable NTSC, SECAM, PAL, PAL-M Polarity Positive or negative Amplitude into 50 e (p-p) Adjustable 0 to 1.5 V p-p into 50 ohm load, (7 % accuracy) Line Marker Selectable Line Video Marker 1-20. Tunnel Diode Drive Capability TD Pulse Drive Square wave at 100 Hz to 100 kHz with variable amplitude of 60 V to 100 V p-p 1-21. Oscilloscope Input Resistance Measurement Specifications Scope Input Selected 50 e e 1 Me e Measurement Range 40 e to 60 e 500 ke to 1.5 Me Uncertainty 0.1 % 0.1 % 1-22. Oscilloscope Input Capacitance Measurement Specifications Scope Input Selected 1 Me e Measurement Range 5 pF to 50 pF Uncertainty (5 % of input + 0.5 pF) 1 1 Measurement made within 30 minutes of capacitance zero reference. 1-23. Overload Measurement Specifications The Overload test function applies for dc or ac (1 kHz square wave) power into the 50 e oscilloscope input and monitors the current. The time measurement counter indicates the time duration of the applied overload signal. When the input protection circuit reacts and opens the 50 e load, the calibrator indication is set to off on the right hand side of the display. In order to prevent front end damage to the oscilloscope, a limited amount of energy is applied by a user selectable time limit. Source Voltage Typical On current Indication Typical Off current Indication Typical Maximum Time Limit DC or AC 1 kHz AC 5 V to 9 V 100 mA to 180 mA 10 mA settable 5 to 60 sec 1-24. External Reference Input Specifications The External Reference Input selection allows the user to provide their own high stability 10 MHz reference clock for the 5820A for all functions except the Wave Generator function. For all other modes, the frequency stability is determined by the external reference stability. The external reference input must be between 1 to 5 V p-p. Introduction and Specifications Specifications 1 1-13 1-25. Auxiliary Input/Output Specifications The maximum input voltage for the auxiliary input is 40 V p-p. Channel Configuration Frequency Typical Loss Typical VSWR 1-Channel < 600 MHz 1.1 dB 1.2:1 1-Channel 600 MHz to 1 GHz 1.3 dB 1.4:1 1-Channel 1 GHz to 2.0 GHz 2.0 dB 1.7:1 1-Channel 2 GHz to 3 GHz 3.0 dB 2.0:1 5-Channel < 600 MHz 1.1 dB 1.2:1 5-Channel 600 MHz to 1 GHz 1.3 dB 1.4:1 5-Channel 1 GHz to 2.0 GHz 2.0 dB 1.7:1 5-Channel 2 GHz to 3 GHz 3.0 dB 2.0:1 1-26. Current Output Specifications Parameter DC Squarewave Amplitude (compliance voltage 2 V max) 100 A to 100 mA 100 Ap-p to 100 mAp-p Accuracy (0.25 % + 0.5 A) (0.25 % + 0.5 A) 1 Frequency Range N/A 10 Hz to 100 kHz Accuracy N/A 2.5 ppm +5 Hz Steps N/A 1,2,5 or continuous 1 Amplitude uncertainty for frequency range 45 Hz to 1 kHz at < 120 mV compliance voltage. 5820A Service Manual 1-14 2-1 Chapter 2 Theory of Operation Title Page 2-1. Introduction. 2-3 2-2. Voltage Mode. 2-7 2-3. Edge Mode . 2-7 2-4. Leveled Sine Wave Mode . 2-7 2-5. Time Marker Mode. 2-7 2-6. Wave Generator Mode . 2-8 2-7. Pulse Generator . 2-8 2-8. Input DC Voltage Measurement Mode . 2-8 2-9. Input Impedance Mode (Resistance). 2-8 2-10. Input Impedance Mode (Capacitance). 2-8 2-11. Current Module . 2-9 2-12. Overload Mode. 2-9 2-13. Trigger. 2-9 2-14. High Frequency Switching. 2-9 2-15. 5 Channel Option. 2-9 2-16. GHz Option Module. 2-9 5820A Service Manual 2-2 Theory of Operation Introduction 2 2-3 2-1. Introduction The following discussion provides a brief overview of the following 5820A operating modes: Voltage Edge Leveled sine wave Time marker Wave generator Video Pulse generator Input impedance Overload Current 5 Channel Option DC Volts Measure GHz Option (2.1 GHz Leveled Sine and Fast Edge). This discussion will allow you to identify which of the main plug-in boards of the Calibrator Mainframe are defective. Figure 2-1 shows a block diagram of the 5820A. Note that while ac power is filtered on the A3 Mother Board, most supply voltages are derived on the A80 Voltage Board. The components in the scope module are shown in Figure 2-2. A signal diagram is shown in Figure 2-3. The scope module consists of the following: The A55 Main Scope Board, which generates leveled sine, marker, capacitance measurement, and trigger. The A51 Voltage/Video Board, which generates precision dc and ac low frequency square wave, video, overload measurement and resistance measurement. The A90 Attenuator/Edge Attenuator, which attenuates the signal by 0 to -48 dB and generates the < 300 ps edge. The A52 Pulse Board, which generates pulse generator signals. 5820A Service Manual 2-4 Guard Processor Board Mother Board A03 Protection Isolation Relays A2 Direct Digital Synthesis Optional 5 Channel Switch Matrix Output Sense Bd A6 Front Panel Processor Board A9 Power Board Wave Gen Function A80 Scope Board A55 Output Trigger Chan 1 2 3 4 NC NC NC 5 Aux in Aux In Relay Control Single Trigger Channel Out Trigger C1 C2 C3 C4 C5 5 Channel Single Channel Power Control Current Board A81 Current Loop Outlet yu068f.eps Figure 2-1. Signal Diagram of Chassis Theory of Operation Introduction 2 2-5 Main Scope Board Voltage Bd Pulse Bd Trigger Out Signal Out Attenuator Bd Control Clock From DDS A6 Ext Ref Clock A51 A55 A52 A90 Power Control 5820 Scope Module yu070f.eps Figure 2-2. Block Diagram of Scope Module 5820A Service Manual 2-6 50 50 ms to 10 ns Unleveled Leveled Level 10 MHz Clock A55 Main Scope Board Trigger %1,10,100,1000 LF PWB HF PWB A6 DDS External Clock In Time Mark I LF Mux. HF Mux. HF Mux. Oscilloscope Calibrator Trigger BNC SCOPE Output BNC pp Detect Step Attenuator Module Leveled Sine Wave and Time Mark II PLLs Pwr Amp. Leveling Loop Edge 10 ns to 2 ns aag031f.eps Figure 2-3. Signal Diagram of Scope Module Theory of Operation Introduction 2 2-7 Other than the scope module, the A81 Current Board, the A6 Direct Digital Synthesis Board, and the A3 Mother Board, provide the other functions in the 5820A. Digital controls are provided by the 5520A-4002 for the front panel display and by 5520A-4009 Out-Guard CPU on the rear panel for all external a