Page 1 ® 5790A AC Measurement Standard Service Manual PN 893292 January 1992 Rev.5, 1/07 © 1992-2007 Fluke Corporation, All rights reserved. Printed in USA All product names are trademarks of their respective companies.
Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
Page 3: Table Of Contents
Input Source Limits ................1-4 1-6. Power Source..................1-4 1-7. Proper Fuse Usage................1-4 1-8. Grounding of the 5790A..............1-4 1-9. Proper Power Cord Usage ..............1-4 1-10. Do Not Operate in Explosive Atmosphere ........1-4 1-11. Do Not Attempt to Operate if Protection may be Impaired....1-4 1-12.
Page 4 5790A Service Manual 2-17. Digital Section Detailed Circuit Description ........2-12 2-18. Digital Power Supply Assembly (A19) ..........2-12 2-19. 5 V Power Supply ..............2-12 2-20. 12 V Power Supplies..............2-12 2-21. 35 V Power Supply ..............2-13 2-22.
Page 5 (continued) Contents 2-83. A/D Amplifier Assembly (A15) ............2-37 2-84. Chopper Circuit................2-37 2-90. A/D Amplifier Circuits ..............2-39 2-96. Digital Control and Power Supply ..........2-41 2-97. DAC Assembly (A16) ..............2-41 2-98. DAC Assembly Reference Circuitry..........2-42 2-99. Duty-Cycle Control Circuit............
Page 6 5790A Service Manual 3-28. Verifying Absolute AC Error for Region IV (70 mV through 700 mV Range) ................3-49 3-29. Verifying Absolute AC Error for Region II (2.2 V through 1000 V Range) ................3-52 3-30. Verifying Absolute AC Error for Region V (2.2 mV through 22 mV) ..................
Page 7 (continued) Contents 5-16. Test Step: ZEROS ................ 5-11 5-17. Test Step: DIVIDERS (Input Dividers) ........5-11 5-18. Test Steps: X2_2V through X2_2MV.......... 5-12 5-19. Test Step: MATCH (Sensor Match) ..........5-13 5-20. Test Step: XFREQ (Frequency Measuring) ......... 5-13 5-21. Test Step: LOOPFILT (Sensor Filter)..........
Page 8 5790A Service Manual...
Page 9: List Of Tables
5700A DC Characterization Test Record, Part 1 ........... 3-8 3-3. 5700A DC Characterization Test Record, Part 2 ........... 3-8 3-4. Equipment Required for 5790A Main Input DC Calibration......... 3-13 3-5. Calibration Steps in Periodic Calibration............... 3-16 3-6. Equipment Required for 5790A Main Input AC Calibration......... 3-20 3-7.
Page 10 5790A Service Manual 6-7. A4 Digiital Motherboard PCA ................6-24 6-8. A6 Wideband PCA (Option -03)................6-27 6-9. A6A1 RMS Support PCA ..................6-32 6-10. A6A2 WB Input Protection PCA ................6-35 6-11. A10 Transfer PCA....................6-37 6-12. A10A1 Precision Amplifier PCA................6-42 6-13.
Page 11: List Of Figures
DC Source Characterization Setup, Part 2 ............. 3-10 3-4. DC Source Characterization Setup, Part 3 ............. 3-11 3-5. 5790A DC Calibration Test Setup ................. 3-14 3-6. Worksheet for 2 V to 1000 V AC Calibration Points..........3-20 3-7. Worksheet for 60 mV to 600 mV AC Calibration Points ........3-21 3-8.
Page 12 5790A Service Manual 6-1. Final Assembly....................... 6-8 6-1. Final Assembly (cont) .................... 6-13 6-2. A62 Input Block Assembly ..................6-16 6-3. A1 Keyboard PCA ....................6-18 6-4. A2 Front Panel PCA....................6-21 6-5. A3 Analog Motherboard PCA................6-23 6-6. A4 Digital Motherboard PCA ................6-26 6-7.
Page 13 Input Source Limits ................1-4 1-6. Power Source..................1-4 1-7. Proper Fuse Usage................1-4 1-8. Grounding of the 5790A..............1-4 1-9. Proper Power Cord Usage ..............1-4 1-10. Do Not Operate in Explosive Atmosphere ........1-4 1-11. Do Not Attempt to Operate if Protection may be Impaired....1-4 1-12.
Page 14 5790A Service Manual...
Page 15: Introduction And Specifications
1-1. Introduction The 5790A makes AC-DC transfer measurements and accurate AC measurements from 700 V to 1000 V (10 Hz to 1 MHz). The optional 5790A-03 Wideband Module increases the 5790A frequency range to 30 MHz for inputs connected to the WIDEBAND 50 e Type “N”...
Page 16: Safety Instructions
1-6. Power Source The 5790A is intended to operate from a power source that will not apply more than 264 V AC RMS between the supply conductors or between the supply conductor and ground. A protective ground connection through the grounding conductor in the power cord is essential for safe operation.
Page 17: Do Not Remove The Cover Unless Qualified
Specifications 1-12. Do Not Remove the Cover unless Qualified To avoid electric shock, do not remove the 5790A cover unless you are qualified to do so. Service procedures are for qualified service personnel only. 1-13. Do Not Service Alone Do not perform internal service or adjustment of this product unless a person capable of rendering first aid resuscitation is present.
Page 18 5790A Service Manual Absolute Uncertainty Specifications 5 °C of Calibration Temperature Absolute Uncertainty Measurement Mode AC/DC Transfer Voltage Range Frequency Range (ppm of Reading + V) Mode 2 Years 90 Days 1 Year 2 Years 10 Hz - 20 Hz 1700 + 1.3...
Page 19: Specifications
Introduction and Specifications Specifications Absolute Uncertainty Specifications (cont.) 5 °C of Calibration Temperature Absolute Uncertainty Voltage Measurement Mode AC/DC Transfer Frequency Range Range (ppm of Reading) Mode 2 Years 90 Days 1 Year 2 Years 10 Hz - 20 Hz 20 Hz - 40 Hz 40 Hz - 20 kHz 20 kHz - 50 kHz...
Page 20 5790A Service Manual Relative Uncertainty Specifications 5 C of Calibration Temperature Relative Uncertainty Measurement Mode AC/DC Transfer Voltage Range Frequency Range (ppm of Reading + V) Mode 2 Years 90 Days 1 Year 2 Years 10 Hz - 20 Hz 100 + 1.3...
Page 21 Introduction and Specifications Specifications Relative Uncertainty Specifications (cont.) 5 C of Calibration Temperature Relative Uncertainty Measurement Mode AC/DC Transfer Voltage Range Frequency Range (ppm of Reading + V) Mode 2 Years 90 Days 1 Year 2 Years 10 Hz - 20 Hz 20 Hz - 40 Hz 40 Hz - 20 kHz 20 kHz - 50 kHz...
Page 22 5790A Service Manual Secondary Performance and Operating Characteristics Temperature Coefficient 24 Hour AC Stability 0 C to 10 C Input Voltage Range Frequency Range 10 C to 40 C Resistance Slow Filter Peak- 40 C to 50 C Peak ppm / C...
Page 23 Introduction and Specifications Specifications Secondary Performance and Operating Characteristics (cont.) Temperature Coefficient 24 Hour AC Stability 0 C to 10 C Input Voltage Range Frequency Range Slow Filter 10 C to 40 C Resistance 40 C to 50 C (ppm of Reading) ppm / C 10 Hz - 20 Hz...
Page 24 5790A Service Manual Secondary Performance and Operating Characteristics (cont) Temperature Coefficient 24 Hour AC Stability 0 C to 10 C Input Voltage Range Frequency Range 10 C to 40 C Resistance Slow Filter (ppm 40 C to 50 C of Reading)
Page 25 Introduction and Specifications Specifications More Secondary Performance and Operating Characteristics Maximum Non-destructive Input ......1200 V rms Guard Isolation ........... 10 V peak Volt-Hertz Product ..........1 x 10 Frequency Accuracy (from 0 C to 50 C) 10 Hz - 120 Hz..........100 ppm + 10 digits Above 120 Hz ..........
Page 26 5790A Service Manual Wideband Uncertainty Specifications (Option -03) Flatness Absolute Uncertainty 0 C to 50 C Flatness 1 year (% of Reading + V) Temperature Voltage Frequency Range (% of Resolution Coefficient Range Reading 90 Days 1 Year 2 Years...
Page 27 30 MHz ............50 ( 5 %) Shunt Input Characteristics The shunt input was designed to allow ac/dc current transfers using the Fluke A40 Series current shunts. 5790A-7001 A40/A40A Current Shunt Adapter and Cable required. Shunt Model Current Range A40 ............. 2.5 mA - 5A A40A ............
Page 28: General Specifications
5790A ............95 VA With Wideband Option........ 120 VA Weight 5790A ............24 kg (53 lb) With Wideband ........... 24.5 kg (54 lb) Line Power............47 Hz to 63 Hz; 10 % of selectable line voltages: 100 V, 110 V, 115 V, 120 V, 200 V, 220 V, 230 V, 240 V Safety..............
Page 29 Introduction and Specifications Specifications 43 cm (17.0 in) Fluke 5790A 17.8 cm (7.0 in) POWER 6.35 cm (2.5 in) 63 cm (24.8 in) FOR CABLE ACCESS (REAR) elu001.eps Figure 1-1. Dimensions 1-17...
Page 30 5790A Service Manual 1-18...
Page 31: Theory Of Operation
Chapter 2 Theory of Operation Title Page 2-1. Introduction................... 2-5 2-2. 5790A Overview................... 2-5 2-3. Functional Block Diagram Discussion ..........2-5 2-4. Digital Section Overview..............2-6 2-5. Analog Section Overview..............2-6 2-6. System Interconnect Detailed Circuit Description ....... 2-9 2-7.
Page 32 5790A Service Manual 2-34. DUART (Dual Universal Asynchronous Receiver/Transmitter) Circuit ................... 2-20 2-35. Clock/Calendar Circuit..............2-20 2-36. Clock Filter Circuit ..............2-20 2-37. CPU to Rear Panel Interface ............2-20 2-38. CPU to Front Panel Interface ............2-21 2-39. Front Panel Assembly (A2) .............. 2-21 2-40.
Page 33: Introduction
Theory of Operation Introduction 2-111. DC Offset Feedback for the RMS Sensor Amplifier ....2-48 2-112. Range Comparator ............... 2-49 2-113. Wideband Frequency Counter............2-49 2-114. Digital Control ................2-50 2-115. A6A2 Input Protection Module............ 2-50...
Page 34 5790A Service Manual...
Page 35: Introduction
Introduction 2-1. Introduction This chapter provides theory of operation in increasing level of detail. The 5790A is first defined in terms of how it makes internal AC-DC transfers to measure unknown AC voltages. Detailed circuit descriptions follow, first for system interconnections including the motherboards, then for digital assemblies, and finally for the analog assemblies.
Page 36: Digital Section Overview
Regulator/Guard Crossing assembly (A17). The guard crossing controls the guarded analog circuitry. A Keyboard assembly provides the user with front-panel control of the 5790A. It contains six keycap LEDs and a keypad. It connects to the Front Panel assembly via a cable.
Page 37: Functional Block Diagram
Theory of Operation Analog Section Overview Regulator/Guard Crossing assembly, create the system power supply for all the analog assemblies. MEASURE INPUT PROTECTION INTERRUPT BINDING POSTS TRANSFER ATTENUATORS SWITCH PROTECTION MODULE TYPE ‘N’ SENSOR CONNECTOR AMPLIFIERS CHOPPER MEASURE DAC PROTECTION INTERRUPT BINDING POSTS ATTENUATORS...
Page 38: Digital Section Block Diagram
5790A Service Manual KEYBOARD ASSEMBLY CONTROL ASSEMBLY FRONT PANEL DISPLAY ASSEMBLY FRONT PANEL INTERFACE BUS µP MEASUREMENT DISPLAY DIGITAL EPROM POWER SUPPLY CLOCK REAR PANEL IEEE-488 I/O ASSEMBLY EEPROM RS-232-C DUART REAR PANEL INTERFACE BUS FIBER OPTIC CABLE UNGUARDED GUARDED...
Page 39: System Interconnect Detailed Circuit Description
Analog Motherboard Assembly (A3) The Analog Motherboard contains the connectors for all assemblies in the guarded section of the 5790A. The Analog Motherboard also contains five relays, a fiber-optic transmitter, a fiber-optic receiver, and a cable for binding post connections. Table 2-1 lists Analog Motherboard connectors.
Page 40: Rear Panel I/O Assembly (A21)
2-14. IEEE-488 (GPIB) Interface The IEEE-488 (GPIB) interface circuit provides the interface between the IEEE-488 connector (J1) and the 5790A processor on the CPU (A20) assembly. The circuitry uses a TMS9914 (U2) General Purpose Interface Bus (GPIB) adapter to meet the requirements for talker/listener operation on the IEEE-488 bus.
Page 41: Rs-232-C Interface
The other channel is available to RS-232-C connector J2 to meet serial interface needs between the 5790A and the external world. The transmit line (*TXDA) is driven by U6D to TX of J2, pin 2. The receive line RX goes from J2, pin 3 through receiver U7C to the receive line *RXDA of the DUART.
Page 42: Rear Panel Cpu Interface
Inductors L3-L6 filter the regulated outputs. Resistor R7 further isolates the 12 V FAN lines from the 12 V power lines. The 12 V FAN and -12 V FAN lines power the two 24 V DC fans inside the 5790A. 2-12...
Page 43: Power Supply
Theory of Operation Digital Section Detailed Circuit Description 2-21. 35 V Power Supply The 35 V power supply powers the grid drivers and the anode drivers on the front panel Measurement Display circuitry. The 35 V supply is full-wave rectified, and regulated by Zener diodes VR14, VR15, and transistor Q5.
Page 44: Cpu Assembly (A20)
Service Manual 2-24. CPU Assembly (A20) The CPU (Central Processing Unit) for the 5790A is a single-board computer based on a 68HC000 microprocessor. Figure 2-4 is a block diagram of the CPU assembly. The CPU assembly communicates with the Guarded Digital section, the Front Panel assembly, and the Rear Panel assembly.
Page 45: Cpu Assembly Block Diagram
Theory of Operation Digital Section Detailed Circuit Description D00-D07 A01-A12 D00-D07 A01-A05 D00-D07 A01-A05 D00-D07 A01-A15 D00-D15 A01-A18 D00-D15 A01-A17 D00-D07 A01-A04 D00-D03 A13-A23 D00-D15 7.37MHz A01-A23 CLOCKS IORESET* RESETL elu005.eps Figure 2-4. CPU Assembly Block Diagram 2-15...
Page 46 5790A Service Manual Table 2-3. CPU Acronym Glossary Signal Name Function A01-A23 Address lines ADCLCKCS* Clock/calendar (U33) chip select Address strobe BERR* Bus error BGACK* Bus grant acknowledge Bus request BRPDRTINT* Rear panel DUART interrupt BRPDTK* Rear panel data transfer acknowledge...
Page 47: Clock Generation
Theory of Operation Digital Section Detailed Circuit Description Table 2-3. CPU Acronym Glossary (cont.) Signal Name Function MISCCS* Miscellaneous chip select enable (upper address bits decoder) NVMCS* Nonvolatile memory chip select NVMOE* Nonvolatile memory output enable PROM0CS* PROM 0 chip select (U15 and U16) PROM1CS* PROM 1 chip select (U17 and U18) PROM2CS*...
Page 48: Address Decoding And Dtack (Data Acknowledge)
5790A Service Manual DOGCLR2 signal from interrupt controller U10. Therefore, DOGCLR2 must occur more often than every 1.14 seconds to clear U11 and prevent the watchdog interrupt. Generation of DOGCLR2 is under software control. The watchdog timer can be disabled by cutting the jumper E1.
Page 49: Interrupt Controller
Read-only memory is contained in three pairs of sockets, U15-U16, U17-U18, and U23- U24. These sockets accommodate 27010 EPROMS, 128 K X 8 devices (128 KB each). The jumpers allow 256 KB devices to be used in their place. The 5790A is shipped with U15-U18 installed, providing 512 KB of EPROM.
Page 50: Electrically-Erasable Programmable Read-Only Memory (Eeprom)
26.8 ms minimum, 49.6 ms maximum. Diode CR7 provides a discharge path for C17 on power-down, allowing the operator to quickly turn the 5790A off and then on again, without interfering with the power-up charge time of the capacitor. Diode CR8 allows the normal microprocessor read of the device to take place.
Page 51: Cpu To Front Panel Interface
PSFAILINT*. Control line FRNTPNLCS* goes directly to the connector P120. 2-39. Front Panel Assembly (A2) The Front Panel assembly, operating in conjunction with the Keyboard assembly (linked by a cable), is the operator interface to the 5790A. This assembly contains two separate vacuum-fluorescent displays: The Control Display The Measurement Display Each display has its own control, high voltage drive, and filament-switching circuits.
Page 52: Decoding And Timing Circuitry
5790A Service Manual Measurement Display through DMDBLANK and OTDBLANK, and alerts the CPU that this failure has occurred. 2-42. Decoding and Timing Circuitry Main decoding and master timing functions for the Front Panel are accomplished by an EP900 PLD (Programmable Logic Device), U3. Two state machines control display refresh and filament switching.
Page 53: Measurement Display Circuitry
Theory of Operation Digital Section Detailed Circuit Description G4 and G5 are driven simultaneously while anode columns G4-C and G5-D are activated, and G4-B and G5-A are driven off. Next, grids G5 and G6 are driven simultaneously, while columns G5-A and G6-B are activated, and G5-D and G6-C are driven off. This pattern is repeated for all 128 grids at a refresh rate of about 75 Hz.
Page 54: Keyboard Scanner Circuitry
5790A Service Manual Measurement Display filament driver circuitry centers on transistors Q7-Q12. The transistors are driven by 7406 open-collector drivers U13C and U13D. These drivers are controlled by AOUT and BOUT as in the Control Display. When AOUT is high, U13C turns Q8 and Q10 on.
Page 55: Keyboard Assembly (A1)
EX TRIG LED3B 2-47. Keyboard Assembly (A1) The Keyboard assembly provides the operator with front panel control of the 5790A. It connects to the Front Panel assembly (A2) through a cable, and includes an elastomeric keypad, and six keycap LEDs.
Page 56: Analog Section Detailed Circuit Description
5790A Service Manual 2-48. Analog Section Detailed Circuit Description Detailed descriptions of each assembly in the analog section are provided in this section. Simplified schematics are provided to supplement the text. 2-49. Filter Assembly (A18) The Filter assembly receives AC inputs from the main power transformer secondaries and provides unregulated DC to the Regulator/Guard Crossing assembly (A17) and regulated DC supplies to the DAC assembly.
Page 57: Unregulated Ch Supplies
The triac circuit protects the 5790A if it is inadvertently plugged into an excessively high line voltage. For example, it protects the 5790A if it is plugged into a 230 V line when the rear panel line voltage select switches are set for 115 V operation.
Page 58: Unregulated Fr1 Supply
5790A Service Manual The -18 FR1 supply consists of bridge rectifier CR17 and filter capacitor C21. Its input is fused with 0.5 A slow-blow fuse F9. The regulated -18 FR1 supply uses the unregulated - 18 FR1 supply and contains regulator U3, filter capacitor C22, and protection diode CR18.
Page 59: Regulated Lh Supplies
Theory of Operation Analog Section Detailed Circuit Description 2-59. Regulated LH Supplies The 5 RLH supply used the unregulated +5 LHR supply from the Filter assembly. The +5 RLH supply uses three-terminal TO-3 regulator U11, bypass capacitors C20 and C70, protection diodes CR17 and CR20.
Page 60: Fr2 Supply
5790A Service Manual 2-63. FR2 Supply FR2 COM is the return path for the 30 FR2 supply. This supply uses the unregulated 30 FR2R supply from the filter assembly and consists of three-terminal TO-39 regulator U5 with heat sink, bypass capacitors C10 and C28, and protection diodes CR9, CR10, and CR12.
Page 61 Theory of Operation Analog Section Detailed Circuit Description 2-66. Inguard Memory Configuration The microcontroller (U56) has 32 KB of external EPROM program memory in IC U64. IC U62 provides 8 KB of external static CMOS RAM. Programmable Logic Device (PLD) U58 does the decoding of the microcontrollers address and the status lines to select the appropriate device.
Page 62 5790A Service Manual receiver on the Digital Motherboard. Another fiber-optic cable links the other receiver/transmitter pair on the motherboards. 2-72. Interface to Guarded Digital Bus The interface to the guarded digital bus consists of a 74HCT245 (U55), a 74HCT244 (U52), a 74HC137 (U53), resistor packs Z52, Z53, and Z54, and the POP line from U58.
Page 63: Transfer Assembly (A10)
Figure 2-5. A10 Transfer Assembly Block Diagram 2-75. Input Signal Paths The 5790A has two DC 1 MHz/700 V to 1000 V inputs, one SHUNT input and one WIDEBAND input. All of these inputs except the WIDEBAND input are routed to the Transfer assembly.
Page 64: Divider Network Simplified Schematic
5790A Service Manual elu008.eps Figure 2-6. Divider Network Simplified Schematic 2-34...
Page 65: Precision Amplifiers
The SHUNT input is compatible with the Fluke series of A40 current shunts. These shunts, when used with the adapter shipped with the 5790A, allow you to measure relative current between 2.5 mA and 20 A with a full-scale output voltage of 0.5 V RMS.
Page 66: Thermal Sensor Circuit
5790A Service Manual A10A3 with U12. A10A3 is a 20 dB, fixed-gain amplifier similar in design to A10A1. Relay K7 is toggled to disconnect A10A1 and connect the output of A10A3 to the sensor. For inputs between 700 V and 22 mV a different, high-gain signal path is employed.
Page 67: A/D Amplifier Assembly (A15)
The A15 A/D Amplifier board contains circuitry for generating the chopped DC reference for the A10 Transfer assembly and circuitry for measuring the output of the Fluke Thermal Sensor circuit, also on the Transfer assembly. The chopper circuit is described first, followed by the A/D amplifier and then the frequency counter.
Page 68 5790A Service Manual 2-87. Chopper Oscillator This block provides a pair of square waves (50 % duty cycle, 180 degrees out of phase) that clock the chopper switches. A 4047 (U8) is configured as an astable multivibrator. Resistor R2 and C4 control the 31.5 Hz rate except when wideband operation is selected, where U13 switches R15 in parallel with R2 to change the frequency to 80 Hz.
Page 69: A/D Amplifier Circuits
Theory of Operation Analog Section Detailed Circuit Description 2-90. A/D Amplifier Circuits Refer to Figure 2-8 a block diagram of the A/D amplifier circuit. The A/D amplifier circuit contains the following main circuit blocks: Null DAC Instrumentation amplifier Switchable active low-pass filter A/D converter Frequency counter with switchable low-pass filter SWITCHABLE...
Page 70 Switches inside the A/D IC can precharge C18 and 19 quickly to reduce the settling time. 2-94. A/D Converter A proprietary Fluke IC (U24) containing an A/D converter and frequency Counter forms the basis for this circuit. Voltage is measured through pins 3, 14, 15, 16, 18, or 23. The following list describes the U24 pin functions: Pin 14 is the diagnostic input.
Page 71: Digital Control And Power Supply
Analog Section Detailed Circuit Description 2-95. Frequency Counter and Low-Pass Filter The Fluke A/D IC (U24) contains the frequency counter. Frequency is measured through pin 3. If the input signal is DC, its polarity is determined through this input. The low-pass filter (R31 and C24) is switched in the frequency measurement line only to filter out high frequency noise.
Page 72: Dac Assembly Reference Circuitry
5790A Service Manual The filter's second input square wave is called the second channel. It is switched between approximately 0.78 mV and 0 V. Its amplitude is derived by resistively dividing the 13 V reference. This second channel is used for extra resolution.
Page 73: Duty-Cycle Control Circuit
Theory of Operation Analog Section Detailed Circuit Description The DC reference circuitry is on the reference hybrid, located on the 4HR9 assembly. The 4HR9 assembly contains a ceramic substrate reference hybrid bonded to a resistor network. All components on this assembly are surface mount devices, except U6 and U7. The resistors are screened with a thick film paste.
Page 74: Dac Filter Circuit
5790A Service Manual The 3 V source is created from the 13 V reference. The 13 V reference is buffered by op amp U1B, configured as a voltage follower. The output from U1B is divided down to 3 V by a 100 ke and 30 ke resistor in the 4HR9 assembly creating 3 V.
Page 75: Negative Offset Circuit
WIDEBAND Type ‘N’ connector is 50 e on all ranges. Essentially, the Wideband Assembly takes over the function of the A10 Transfer Assembly when the 5790A is in the Wideband mode. Refer to Figure 2-10 and the Wideband Assembly schematic diagram for the remaining theory discussion.
Page 76 5790A Service Manual Note A detailed circuit description of the A6A2 Input Protection module is provided further on. elu012.eps Figure 2-10. A6 Wideband Assembly Block Diagram 2-46...
Page 77: Input Signal Path For The Upper Four Ranges
Theory of Operation Analog Section Detailed Circuit Description 2-106. Input Signal Path for the Upper Four Ranges The following text describes the input signal path from the front panel to the input of RMS sensor buffer amplifier U5 as shown on the block diagram. Input signals on the upper four Wideband ranges (7 V, 2.2 V, 700 mV, and 220 mV) pass through relays K1 and K4 to resistor network Z1, which provides a 50 e load.
Page 78: Dc Offset Feedback For Amplifier U3 (Lower Ranges)
DC output of the RMS sensor U15 as the input is alternated between the input signal and the WB CHOP signal at a 1 Hz rate. After applying appropriate constants determined when the 5790A was calibrated, the RMS value of the input is displayed on the front panel.
Page 79: Range Comparator
Theory of Operation Analog Section Detailed Circuit Description 2-112. Range Comparator Comparator U11 and U13, and associated parts form a circuit that indicates when the RMS sensor circuit is being driven beyond normal limits. Each of the 4 Schottky diodes CR16 through CR19 is biased by current sources Q7 and Q8 to 6 mA each.
Page 80: Digital Control
5790A Service Manual frequency on the COUNTER line is equal to the input frequency between 10 Hz and 1.99999 MHz, and divided by 16 from 2 MHz to 30 MHz (resulting in 125 kHz to 1.875 MHz). 2-114. Digital Control Digital control of the Wideband assembly comes from the instrument digital bus and is stored in latches on the Wideband assembly.
Page 81: Calibration And Verification
Chapter 3 Calibration and Verification Title Page 3-1. Introduction................... 3-3 3-2. Calibration Cycle................3-3 3-3. Periodic and Service Calibration ............3-3 3-4. Full or Range Calibration ..............3-3 3-5. Automating Calibration and Verification ......... 3-3 3-6. How Calibration Memory is Organized ........... 3-4 3-7.
Page 82 5790A Service Manual 3-32. Wideband 1-kHz Gain VerificatioN, 7V, 2.2V, 700 mV, and 70 mV Ranges ............... 3-65 3-33. WIDEBAND 1-kHz GAIN VERIFICATION, 22 mV RANGE . 3-65 3-34. Wideband Gain Verification, 10 Hz to 500 kHz......3-66 3-35. Wideband Flatness Verification ........... 3-66...
Page 83: Introduction
Service calibration is similar to the procedure done at the factory when the 5790A is built. For this procedure, set the rear panel CALIBRATION MODE switch to SERVICE. This switch setting adds many calibration points to the software-controlled calibration routine.
Page 84: How Calibration Memory Is Organized
5790A Service Manual Note A technical paper describes the system in use at Fluke to calibrate and verify the 5790A: Calibration and Traceability of a Fully Automatic AC Measurement Standard, by David Deaver, presented in the NCSL Workshop and Symposium, 1991. Reprints are available from Fluke.
Page 85: How To Use The Calibration Menus
Calibration and Verification Introduction 3-7. How to Use the Calibration Menus When you press the [UTIL MENUS] key followed by the “Cal” softkey. The top-level calibration menu appears as shown below: Update Done Zero With Reports Dates Dates elu014.eps The functions of the softkeys and the location of related instructions are described next. 3-8.
Page 86: Zero Cal Softkey
Calibration. 3-10. See Cal Dates Softkey This softkey displays the dates of the last zero calibration, main calibration, service calibration (normally when the 5790A was built), and Wideband option calibration (if installed). 3-11. Cal Reports Softkey This softkey produces a menu that lets you print one of the following types of calibration reports through the serial interface: MEASUREMENT SHIFTS: STORED VS.
Page 87: Periodic Calibration
3-15. Characterizing the DC Source To meet the test uncertainty requirements for 5790A main input DC calibration, you must first characterize (i.e., calibrate to a higher uncertainty than the published specifications) the DC function of the 5700A at the required points. Table 3-1 lists the equipment required for DC source characterization.
Page 88 5790A Service Manual Table 3-2. 5700A DC Characterization Test Record, Part 1 5790A Calibration DC 845A() Final Null 5700A Error Display Indication to obtain Requirement (V) ( uV) Characterized Nominal Output 1000 -200 -600 -1000 Table 3-3. 5700A DC Characterization Test Record, Part 2...
Page 89 Calibration and Verification Periodic Calibration X W Warning Some steps in the following procedure involve the calibrator outputs at lethal voltages. Use extreme care not to touch any exposed conductors. 1. Warm up all equipment for the period specified in the manufacturer's manual. The 720A and 752A should be allowed to “soak”...
Page 90 5790A Service Manual Whenever EXT Guard is activated (the green indicator on the EX GRD key is on), you must refresh the guard status after the instrument changes from the 220V range to any higher range. To refresh, push the EX GRD key two times (once to turn the indicator off, and once to turn the indicator on).
Page 91 Calibration and Verification Periodic Calibration 12. Press CHNG SIGN on the 5440B. Set the 845A( ) to the 10 mV range. Set the 5700A to -200 V, OPERATE. Repeat the nulling procedure of step 9, recording the 5700A Error Display indication opposite -200 V in Table 3-2. Set the 5700A to STANDBY.
Page 92 5790A Service Manual the 5440B output for a null. Repeat this procedure until you obtain a null of 1 V. Set the 845A( ) OPR/ZERO to ZERO and set the 5700A to STANDBY. Record the 5440B voltage indication in Table 3-3 after "5440B CHARACTERIZED 6 V OUTPUT".
Page 93: Dc Calibration
It typically takes five minutes to thermally stabilize a connection after it has been touched. 3. Turn on the 5790A and 5725A and allow 30 minutes warmup time. 4. Set the 5700A to EXT SENSE. Verify that the shorting strap is connected between GUARD and GROUND.
Page 94: 5790A Dc Calibration Test Setup
5790A AC MEASUREMENT STANDARD GUARD VOLTAGE MODE CURRENT MODE GROUND 5725A STANDBY FAULT POWER OVERLOAD CABLE OFF 5700A CALIBRATOR WITH 5725A AMPLIFIER EXT SENSE INT GUARD STRAP FROM GUARD TO GROUND elu020.eps Figure 3-5. 5790A DC Calibration Test Setup 3-14...
Page 95 Note The following display appears if the 5790A has not been turned on for at least 30 minutes. If you know that warmup requirements are met, for example if you briefly turned off the power, press “YES, do it” to override.
Page 96 The display tells you that the calibration step is in progress and informs you with a beep when the step is complete. 11. When the 5790A completes the step, the next DC step which requires -2 V DC is presented on the display. Change the 5700A setting accordingly and do the calibration step as in the previous two steps.
Page 97 Calibration and Verification Periodic Calibration Table 3-5. Calibration Steps in Periodic Calibration (cont.) Tolerance Calibration Purpose of Step Name Voltage to Apply Source ( PPM) Calibration Step 1000 V Positive DC 1000 V DC Establishes gain and DC offset for the 1000 V 1000 V Negative DC -1000 V DC range...
Page 98 5790A Service Manual Table 3-5. Calibration Steps in Periodic Calibration (cont.) Tolerance Calibration Purpose of Step Name Voltage to Apply Source ( PPM) Calibration Step Generates flatness 1000 V AC 100 kHz 600 V RMS, 100 kHz calibration data for the...
Page 99: Ac Calibration
Before you begin, make 12 copies of Figure 3-6 and 10 copies of Figure 3-7. Those are worksheets to help you calibrate the various AC points. Table 3-6. Equipment Required for 5790A Main Input AC Calibration Required Equipment Manufacturer and Model...
Page 100: Worksheet For 2 V To 1000 V Ac Calibration Points
5790A Service Manual VOLTAGE (NOMINAL) FREQUENCY 792A CORRECTION (PPM) 792A 5790A DC AVERAGE DC 792 = DC 5790 = AC 792 AC MEAS I+DCI + I-DCI DC AVERAGE AC 792 792 CORR AC MEAS DC 5790 DC 792 EXAMPLE: VOLTAGE (NOMINAL) 2.0 V...
Page 101: Worksheet For 60 Mv To 600 Mv Ac Calibration Points
Calibration and Verification Periodic Calibration VOLTAGE (NOMINAL) FREQUENCY 5700A ERROR DISPLAY FROM TABLE 3-3, POSITIVE 5700A ERROR DISPLAY FROM TABLE 3-3, NEGATIVE 792A CORRECTION (PPM) 792A DMM READING DC 792 AC 792 AC MEAS = I+DCI + I-DCI DC 792 AC 792 792 CORR AC MEAS...
Page 102: 5790A Ac Calibration Test Setup
CABLE OFF 5700A CALIBRATOR WITH 5725A AMPLIFIER INT SENSE INT GUARD STRAP FROM GUARD TO GROUND elu030.eps Figure 3-8. 5790A AC Calibration Test Setup 2. Set up the 5700A as follows so that its internal AC transfers are off: 3-22...
Page 103 Entry elu032.eps 5. For all the AC cal points down to the 70 mV range, use the Fluke 792A AC/DC Transfer Standard to adjust the AC voltage level being applied to the 5790A INPUT1 connector. There are three procedures for AC calibration points, depending on their amplitude.
Page 104 Set the 5700A to the nominal test voltage, DC positive (Do not use a characterized setting as the 5790A is now used as the DC reference, thus allowing for any resistive drop caused by the 792A loading). Wait for the 5700A “U”...
Page 105 Observe the default “EXACT VALUE” on the display. It shows the allowed number of decimal places for you to enter. Enter your computation of “AC MEAS” in the 5790A using the keypad, and press the [ENTER] key. After you press [ENTER], the Control Display shows the progress of the internal process of the calibration step.
Page 106: Millivolt Range Bootstrapping Technique
Figure 3-9. Millivolt Range Bootstrapping Technique a. Calibrate the 22 mV range as follows: 1) Lock the 5790A in the 70 mV range. The 792A may be left attached, although it is not used. 2) Apply the requested voltage and frequency. When the reading on the 5790A Measurement Display settles, record the reading.
Page 107: Calibrating The Wideband Ac Option
The following procedure is a part of periodic calibration only if a 5790A-03 Wideband Option is installed in your 5790A. If you are replacing or have repaired the Wideband assembly, perform the Wideband Amplifier Rolloff Adjustment as described in the Service Calibration part of this chapter before calibration.
Page 108 Digital Equipment VT-100 Terminal [1] See Table 3-16, “IF USING METHODS OTHER THAN SPECIFIED, MAX. UNCERT.” for specific Voltage/Frequency and Uncertainty information. [2] The JFW attenuators must be characterized by Fluke (see text). [3] Required only for Service Calibration. 3-28...
Page 109: Characterizing The Ac Source
5700A ERROR column of Table 3-8 for later use during the WIDEBAND flatness calibration. Note Fluke offers a calibration service for NARDA Model 777C attenuators at the Everett, Service Center. For price and delivery of this calibration service, please call the Everett Service Center at (206) 356-5560.
Page 110 2. Make sure equipment warmup requirements are met. 3. Lock the 5790A on the 220 mV range. 4. Set the 5700A to output 3.2 V at 1 kHz. The 5790A will read approximately 100 mV, and the 3 V A55 output will be about 7 mV.
Page 111: Calibrating Wideband Input Gain At 1 Khz
14. Proceed to each of the frequencies listed in Table 3-8. Set the 5700A frequency, and adjust the 5700A to give the same error on the 5790A display as recorded in the table from the previous steps. Record the error displayed by the 5700A (both magnitude and sign) in Table 3-8 in PPM.
Page 112 7. Use the number keys to enter the value displayed on the 8506A DMM into the 5790A, then press [ENTER]. 8. The 5790A will calibrate the 7 V range and proceed to the 2.2 V range. 9. Apply 2.0 V at 1 kHz and press “DO STEP” as before.
Page 113: Calibrating Wideband Input Flatness
Calibration and Verification Periodic Calibration and the 5790A will calibrate the 7 mV range and step to the 2.2 mV calibration display. 20. The 2.2 mV range is done in a similar manner by reading the value on the 7 mV range and entering the value when requested and then pressing the [ENTER] key.
Page 114 6. To establish a 1 kHz reference at the beginning of each range, set the 5700A to 3.2 V and 1 kHz and set the 5790A to the 7 V range in this case. The 5790A will measure the magnitude. Record this value in Table 3-8.
Page 115: Service Calibration
Service calibration is the procedure done at the factory when the 5790A is built (However, Fluke uses an automated calibration system.) Use the same procedure as for periodic calibration, as previously defined, except set the rear panel CALIBRATION MODE switch to SERVICE and the CALIBRATION STORE switch to ENABLE.
Page 116 5790A Service Manual Table 3-10. Calibration Steps in Service Calibration Tolerance of Purpose of Step Name Voltage to Apply Calibration Source Calibration Step ( PPM) Calibrates DACs and Basic DC 2 V DC thermal sensor. (This is the unscaled range) Corrects DC turnover Sensor turnover -2.0...
Page 117 Calibration and Verification Service Calibration Table 3-10. Calibration Steps in Service Calibration (cont.) Tolerance of Purpose of Step Name Voltage to Apply Calibration Source Calibration Step ( PPM) Establishes gain and DC 2.2 mV Positive DC 2 mV DC 1000 offset for the 2.2 mV range 2.2 mV Negative DC...
Page 118 5790A Service Manual Table 3-10. Calibration Steps in Service Calibration (cont.) Tolerance of Purpose of Step Name Voltage to Apply Calibration Source Calibration Step ( PPM) 70 V AC 1 kHz 60 V RMS, 1 kHz Generates flatness 70 V AC 20 kHz...
Page 119: Xfer Offset Adjustment
If you repaired or replaced the Transfer assembly, adjust the millivolt-range amplifier offset for zero as follows: 1. Turn off the power and unplug the 5790A. 2. Remove the eight flat-head machine screws from the top cover and remove the top cover.
Page 120: Wideband Amplifier Rolloff Adjustment
Make the calculations shown in the table for use in steps 16 and 26. 11. Set the 5790A to WBND and the 220 mV range. 12. Set the 5700A to 3.2 V at 1 kHz, operate. The 5790A will read approximately 100 mV. 3-40...
Page 121 Calibration and Verification Service Calibration VOLTAGE SELECT SWITCHES IEEE RS232 A21 REAR PANEL PCA A18 FILTER PCA A17 REGULATOR/GUARD CROSSING PCA A16 DAC PCA A15 A/D AMPLIFIER PCA ACCESS HOLE THROUGH GUARD COVER A10 TRANSFER PCA A6 WIDEBAND PCA WIDEBAND A4 DIGITAL MOTHER BOARD PCA SHIELD COVER...
Page 122 220 mV range at the bottom of Table 3-11. 17. Raise the front of the guard cover and adjust C24 for a 5790A display of -3500 PPM 1000 PPM. (Use a Johanson #8777 tool or equivalent).
Page 123: Verification
Verifying the Main Input requires measurements and calculations that result in over 400 entries in a test record. At Fluke, an automated procedure is used as described in the introduction to this section. Test voltages and frequencies are divided into five regions as defined in Table 3-12.
Page 124 5790A Service Manual Table 3-13. Test Record for Main Input Verification 0.0022 0.002 10 Hz 1700 2350 2350 No spec 0.0022 0.002 20 Hz 1390 1390 No spec 0.0022 0.002 100 Hz 1070 1070 No spec 0.0022 0.002 1 kHz...
Page 125 Calibration and Verification Verification Table 3-13. Test Record for Main Input Verification (cont.) 0.022 0.02 300 kHz 1010 1010 No spec 0.022 0.02 500 kHz 1160 1290 No spec 0.022 0.02 1 MHz 1700 2100 No spec 0.07 0.06 10 Hz No spec 0.07 0.06...
Page 126 5790A Service Manual Table 3-13. Test Record for Main Input Verification (cont.) 20 kHz 50 kHz 100 kHz No spec 300 kHz No spec 500 kHz No spec 1 MHz No spec 10 Hz 20 Hz 100 Hz 1 kHz...
Page 127 Calibration and Verification Verification Table 3-13. Test Record for Main Input Verification (cont.) 20.0 100 Hz 20.0 1 kHz 20.0 10 kHz 20.0 20 kHz 20.0 50 kHz 20.0 100 kHz No spec 20.0 300 kHz No spec 20.0 500 kHz No spec 20.0 1 MHz...
Page 128: Verifying Ac-Dc Difference For Regions I And Iii (220 Mv Through 1000 V Range)
1 MHz .0003 MHz [1] Apply the test voltage into the 5790A (INPUT 1 or INPUT 2) and PM6666 counter. The “Measured Error” is the deviation of the 5790A from the counter. 3-27. Verifying AC-DC Difference for Regions I and III (220 mV through 1000 V...
Page 129: Verifying Absolute Ac Error For Region Iv (70 Mv Through 700 Mv Range)
2. For each point, take the AC and DC measurements and enter them in Figure 3- 17. To verify the 5790A to its specifications, the tolerance of calibration source must meet or exceed the tolerances shown in Table 3-13. Use characterized DC settings as follows: Set the 5700A to nominal, then use the knob to adjust for the error display recorded in Table 3-3.
Page 130: Worksheet For Ac-Dc Error, 70 Mv Through 700 Mv Ranges
5790A Service Manual VOLTAGE (NOMINAL) FREQUENCY 5700A ERROR DISPLAY FROM TABLE 3-3, POSITIVE 5700A ERROR DISPLAY FROM TABLE 3-3, NEGATIVE 792A CORRECTION (PPM) 792A 5790A DC AVERAGE DC 792 = DC 5790 = AC 792 = AC 5790 = AC-DC ERROR =...
Page 131: Worksheet For Ac-Dc Error, All Other Ranges
Calibration and Verification Verification VOLTAGE (NOMINAL) FREQUENCY 792A CORRECTION (PPM) 792A 5790A DC AVERAGE DC 792 = DC 5790 = AC 792 = AC 5790 = AC-DC ERROR = I+DCI + I-DCI DC AVERAGE DC 5790 - AC 5790 DC 792 -...
Page 132: Verifying Absolute Ac Error For Region Ii (2.2 V Through 1000 V Range)
5790A Service Manual VOLTAGE (NOMINAL) FREQUENCY 5700A ERROR DISPLAY FROM TABLE 3-3, POSITIVE 5700A ERROR DISPLAY FROM TABLE 3-3, NEGATIVE 792A CORRECTION (PPM) 792A 5790A DC AVERAGE DC 792 = AC 792 = AC 5790 = AC ERROR = I+DCI + I-DCI...
Page 133: Verifying Absolute Ac Error For Region V (2.2 Mv Through 22 Mv)
Table 3-3. Take dual polarity DC readings and record them in Figure 3-18. To verify the 5790A to its specifications, the tolerance of the DC source must meet or exceed the tolerances shown in Table 3-10.
Page 134 5790A Service Manual VOLTAGE (NOMINAL) 5700A ERROR DISPLAY FROM TABLE 3-3, POSITIVE 5700A ERROR DISPLAY FROM TABLE 3-3, NEGATIVE 5790A READING DC 5790 = DC ERROR = DC 5790 I+DCI + I-DCI DC 5790 - DC NOMINAL DC ERROR (PPM) DC NOMINAL elu046.eps...
Page 135 Table 3-14. Worksheet for Wideband 22 mV, 7 mV, and 2.2 mV 1 kHz Gain Measured by Measured by Range Input Voltage 8506A/8920A at 5790A at INPUT 1 INPUT 1 22 mV 10 mV 7 mV 3.2 mV 2.2 mV 1 mV Table 3-15.
Page 136 5790A Service Manual Table 3-15. Wideband Flatness Verification Worksheet (cont.) ___________Range 10 MHz 12 MHz 15 MHz 17 MHz 20 MHz 23 MHz 26 MHz 28 MHz 30 MHz Table 3-16. Wideband Verification Test Record 3.2 V 10 Hz 0.012 0.10...
Page 137 Calibration and Verification Verification Table 3-16. Wideband Verification Test Record (cont.) 3.2 V 1 MHz 0.025 0.05 No Spec No Spec 3.2 V 1.2 MHz 0.050 0.05 No Spec No Spec 3.2 V 2 MHz 0.050 0.05 No Spec No Spec 3.2 V 3 MHz 0.100...
Page 138 5790A Service Manual Table 3-16. Wideband Verification Test Record (cont.) 2.2 V 1.0 V 700 kHz 0.025 0.05 No Spec No Spec 2.2 V 1.0 V 1 MHz 0.025 0.05 No Spec No Spec 2.2 V 1.0 V 1.2 MHz 0.050...
Page 139 Calibration and Verification Verification Table 3-16. Wideband Verification Test Record (cont.) 700 mV 320 mV 700 kHz 0.025 0.05 No Spec No Spec 700 mV 320 mV 1 MHz 0.025 0.05 No Spec No Spec 700 mV 320 mV 1.2 MHz 0.050 0.05 No Spec...
Page 140 5790A Service Manual Table 3-16. Wideband Verification Test Record (cont.) 220 mV 100 mV 500 kHz 0.021 0.04 0.36 220 mV 100 mV 700 kHz 0.026 0.05 No Spec No Spec 220 mV 100 mV 1 MHz 0.026 0.05 No Spec...
Page 141 Calibration and Verification Verification Table 3-16. Wideband Verification Test Record (cont.) 70 mV 32 mV 500 kHz 0.021 0.05 0.46 70 mV 32 mV 700 kHz 0.026 0.05 No Spec No Spec 70 mV 32 mV 1 MHz 0.051 0.05 No Spec No Spec 70 mV...
Page 142 5790A Service Manual Table 3-16. Wideband Verification Test Record (cont.) 22 mV 10 mV 200 kHz 0.022 0.07 22 mV 10 mV 500 kHz 0.022 0.07 22 mV 10 mV 700 kHz 0.026 0.07 No Spec No Spec 22 mV...
Page 143 Calibration and Verification Verification Table 3-16. Wideband Verification Test Record (cont.) 7 mV 3.2 mV 200 kHz 0.022 0.10 0.55 7 mV 3.2 mV 500 kHz 0.022 0.10 0.55 7 mV 3.2 mV 700 kHz 0.026 0.10 No Spec No Spec 7 mV 3.2 mV 1 MHz...
Page 144 5790A Service Manual Table 3-16. Wideband Verification Test Record (cont.) 2.2 mV 1 mV 100 kHz 0.012 0.05 0.62 2.2 mV 1 mV 200 kHz 0.022 0.16 0.62 2.2 mV 1 mV 500 kHz 0.022 0.16 0.62 2.2 mV 1 mV 700 kHz 0.027...
Page 145: Wideband 1-Khz Gain Verification, 7V, 2.2V, 700 Mv, And 70 Mv Ranges
30 MHz .02 MHz [1] Apply the test voltage into the 5790A wideband input and PM6666 counter. The “Measured Error” is the deviation of the 5790A from the counter. 3-32. Wideband 1-kHz Gain VerificatioN, 7V, 2.2V, 700 mV, and 70 mV Ranges 1.
Page 146: Wideband Gain Verification, 10 Hz To 500 Khz
5790A Service Manual HP 3458A DMM SEE TABLE 3-9 5700A CALIBRATOR FOR ATTENUATORS 5790A REQUIRED FOR EACH RANGE WIDEBAND WIDEBAND INPUT OUTPUT ATTEN TYPE ‘N’ TEE elu048.eps Figure 3-19. Wideband Verification Test Setup, Part 2 3-34. Wideband Gain Verification, 10 Hz to 500 kHz...
Page 147 12. Proceed to the first frequency listed in Table 3-15 and adjust the 5700A to the TOTAL ERROR value (sign and magnitude) listed in Table 3-15. 13. Read the error on the 5790A error display and record in the WIDEBAND input verification test record, Table 3-16.
Page 148 5790A Service Manual 3-68...
Page 149 A Message From Fluke Corporation Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices 1. Knowing that there is a problem.
Page 150 8. WHEN REMOVING PLUG-IN ASSEMBLIES 5. USE STATIC SHIELDING CONTAINERS FOR HANDLE ONLY BY NON-CONDUCTIVE HANDLING AND TRANSPORT. EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES. 6.
Page 151: Maintenance
Chapter 4 Maintenance Title Page 4-1. Introduction................... 4-3 4-2. Cleaning the Air Filter ................4-3 4-3. General Cleaning .................. 4-3 4-4. Cleaning PCA's..................4-4 4-5. Access Procedures ................4-5 4-6. Top and Bottom Covers..............4-5 4-7. Digital Section Cover ............... 4-5 4-8.
Page 152 5790A Service Manual...
Page 153: Introduction
3. Reinstall the filter element, its retainer, and the knurled screw. 4-3. General Cleaning To keep the 5790A looking like new, clean the case, front panel keys, and lens using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics.
Page 154: Cleaning Pca's
5790A Service Manual JOHN FLUKE MFG.CO., INC MADE IN U.S.A VARIOUS ASPECTS OF THIS INSTRUMENT ARE PROTECTED BY ONE OR MORE OF THE FOLLOWING PATENTS US.4716398 ADDITIONAL PATENTS PENDING NO INTERNAL USER SERVICEABLE PARTS. REFER SERVICE TO QUALIFIED PERSONNEL. TO CLEAN FILTER REMOVE FROM INSTRUMENT...
Page 155: Access Procedures
4-6. Top and Bottom Covers Check that power is not connected to 5790A; the power control must be off, and the line power cord must be disconnected. Top and bottom covers are each secured with eight Phillips head screws (four front, four rear).
Page 156: Rear Panel Assembly Access
5790A Service Manual 4-10. Rear Panel Assembly Access Refer to Figure 4-3 during the following procedure: 1. Remove the screws that secure the Rear Panel assembly housing. 2. Gently pull the rear panel housing from the Rear Panel. 3. Allow the rear panel housing to lay flat on the work surface by removing the two ribbon cables from the Rear Panel board.
Page 157: Front Panel Removal And Installation
Position the Front Panel on its handles, in front of the instrument. 3. If you need to completely detach the Front Panel from the 5790A, you can remove the paddle board from the Analog Motherboard, or you can disconnect the input cables from the Front Panel assembly.
Page 158: Analog Assembly Removal And Installation
4-16. Power Transformer Removal and Installation Use the following procedure to remove the Power Transformer assembly: 1. Remove the 5790A Front and Rear Panels. 2. Remove the Digital Power Supply (A19) and CPU (A20) assemblies. 3. Detach the five connectors leading from the Power Transformer assembly to the Digital Motherboard.
Page 159: Hybrid Cover Removal
The procedure that follows can be used to install a 5790A-03 Wideband AC Voltage module in a 5790A. The option consists of one circuit board. This procedure is to be done only at Service Centers. 1. Remove the top and bottom covers and analog section cover as described in paragraphs 4-5 and 4-7.
Page 160: Clearing Ghost Images From The Control Display
(or at least several hours). Proceed as follows to burn in the Control Display: 1. Turn on the 5790A and press the "Setup Menus" softkey. 2. Press [UTIL MENUS] followed by the "Diags" softkey.
Page 161: Replacing The Clock/Calendar Backup Battery
5. Solder a replacement battery in place (refer to the parts list for replacement information if necessary.) 4-21. Using Remote Commands Reserved for Servicing This information documents remote commands not described in the 5790A Operator Manual, Chapters 5 and 6. The commands described here are useful for servicing the instrument.
Page 162: Error Codes
Clears the list of the fatal faults logged since the list was last cleared by the FATALCLR command. The list is read by the FATALITY? query. (Sequential command.) Parameter None. 4-23. Error Codes The 5790A error codes are listed below. No errors Error queue is full Invalid procedure number No such step in procedure...
Page 163 Maintenance Error Codes INPUT2 Correction factor out of limits Calibration step in progress Cal error occurred; Already reported Need A %s to do that Need Wideband AC option to do that IG Software out of date: Use %s or newer A17 guardcrossing: ROM checksum A17 guardcrossing: RAM A17 guardcrossing: DUART...
Page 164 5790A Service Manual Invalid range Can't get Ref Can't set average Ref Can't decode learned string Learned sting checksum bad Recalling unsaved instrument state Already printing a report Eternal guard not available ACK queue full Both sides of GX want to be master...
Page 165 Maintenance Error Codes 1302 Bad parameter count 1303 Bad keyword 1304 Bad parameter type 1305 Bad parameter unit 1306 Bad parameter value 1307 488.2 I/O deadlock 1308 488.2 Interrupted Query 1309 488.2 Unterminated command 1310 488.2 Query after indefinite response 1311 Invalid from GPIB interface 1312...
Page 166 5790A Service Manual 1606 Inguard CPU command error 1607 Timed out waiting for inguard reply 1608 Sequence name too long 1609 Element array full 1610 Name array full 1611 Already defining a sequence 1612 Not defining a sequence 1613 Command failed...
Page 167 Maintenance Error Codes 2300 Watchdog timed out (tid=%d) 65535 Unknown error 4-17...
Page 168 5790A Service Manual 4-18...
Page 169: Troubleshooting
Chapter 5 Troubleshooting Title Page 5-1. Introduction................... 5-3 5-2. Main CPU (A20) Power-Up Tests ........... 5-3 5-3. A17 Guard Crossing Processor Power-Up Tests......5-3 5-4. System Startup Tests ................ 5-4 5-5. Diagnostic Tests ................5-4 5-6. Test Step: MAMA8255 (Motherboard 8255) ......5-5 5-7.
Page 170 5790A Service Manual...
Page 171: Introduction
Troubleshooting Introduction 5-1. Introduction This chapter describes the processes that take place during power-up self tests and during diagnostics. By understanding the diagnostics test processes, error messages can provide more information. Run self diagnostics by pressing [UTIL MENUS] followed by the “Diags” softkey. During all diagnostic procedures all the input relays are open.
Page 172: System Startup Tests
5790A Service Manual 5-4. System Startup Tests During power-up, the integrity of starting and maintaining a communication link with the Guard Crossing processor is done. All the nonvolatile constants are checked for CRC errors. 5-5. Diagnostic Tests Diagnostics start with the lowest level of hardware and work up to testing the basic functionality of each range.
Page 173: Test Step: Mama8255 (Motherboard 8255)
Troubleshooting Introduction X220MV, 220 mV Range X70MV, 70 mV Range X22MV, 22 mV Range X7MV, 7 mV Range X2_2MV, 2.2 mV Range MATCH, Sensor Match XFREQ, Measure chopper frequency LOOPFILT, Sensor Loop The following steps are only done if the Wideband option is installed: WOVLD, Wideband Overload W7V, Wideband 7 V Range W2_2V, Wideband 2.2 V Range...
Page 174: Test Step: Dac8254 (Dac 8254)
5790A Service Manual Possible errors include: Error Code 3000 : A3 Motherboard 8255 Control Word Test Failed Error Code 3000 : A3 Motherboard 8255 Port A Test Failed Error Code 3000 : A3 Motherboard 8255 Port B Test Failed Error Code 3000 : A3 Motherboard 8255 Port C Test Failed elu054.eps...
Page 175: Test Step: Adselftest (A/D Internal Selftest)
Troubleshooting Introduction 5-9. Test Step: ADSELFTEST (A/D Internal Selftest) When diagnostics are first started, the communication channel with the A/D chip is restarted. If you get an Error Code 1604: Guard Crossing CPU A/D Error, suspect the serial communication hardware between the DUART on the A17 Guard Crossing assembly and U24 on the A15 A/D Amplifier assembly.
Page 176: Test Step: Addac (A/D Dac Output)
5790A Service Manual 3. Connect NULLDAC to positive input of instrumentation amplifier, minus input to RCOM. Program NULLDAC to output 1.0. Measure with x1 A/D range. 4. Connect NULLDAC to negative input of instrumentation amplifier, positive input to RCOM. Program NULLDAC to output 1.0. Measure with x1 A/D range.
Page 177: Test Step: Chopper (A/D Chopper)
Troubleshooting Introduction Possible errors include: Error Code 3006 : A15 A/D DAC DACHI 0.0 Failed Error Code 3006 : A15 A/D DAC DACHI 2.0 Failed Error Code 3006 : A15 A/D DAC DIVOUT 1.0 Failed Error Code 3006 : A15 A/D DAC DIVOUT5 2.0 Failed elu060.eps These errors indicate a possible fault on the A15 A/D Amplifier assembly or the A16 DAC assembly.
Page 178: Test Step: Prot (Protection)
5790A Service Manual Possible errors include: Error Code 3007 : A15 A/D Chopper 0 dB High Failed Error Code 3007 : A15 A/D Chopper 0 dB Low Failed Error Code 3007 : A15 A/D Chopper 20 dB Failed Error Code 3007 : A15 A/D Chopper 40 dB Failed...
Page 179: Test Step: Zeros
Troubleshooting Introduction This error indicates a fault in the overload circuitry on A10 Transfer assembly. The overload interrupt should toggle on and off at a slow rate as the overload detection circuitry detects sensor overheating and clamps the sensor input. When the sensor cools down the clamp circuitry releases.
Page 180: Test Steps: X2_2V Through X2_2Mv
5790A Service Manual Possible errors include: Error Code 3013 : A10 Transfer 22 V Divider Test Failed Error Code 3013 : A10 Transfer 220 V Divider Test Failed Error Code 3013 : A3 Motherboard 1000 V Divider Test Failed elu065.eps For the A3 Motherboard 1000 V Divider error, the most likely problem is that the cable from the divider the motherboard is not connected.
Page 181: Test Step: Match (Sensor Match)
Troubleshooting Introduction 5-19. Test Step: MATCH (Sensor Match) This tests that input and output sections of the RMS sensor match. The test proceeds as follows: 1. Configure instrument in 2.2 V range with no input. 2. Hook chopper to Transfer assembly stopped in the high state. 3.
Page 182: Test Step: Wovld (Wideband Overload)
5790A Service Manual 5-22. Test Step: WOVLD (Wideband Overload) Tests the sensor input overvoltage circuitry. Configure per 2.2 V range, no inputs. Set up with chopper connected to sensor. Program DAC to 0.5 V. Check trip status. Should indicate overload.
Page 183: Test Step: Wloopfilt (Wideband Sensor Filter)
Troubleshooting Introduction This error indicates that the fault is probably on A6 Wideband assembly. There is a slight chance the fault is on A15 A/D Amplifier assembly. Check that the chopper (AC signal) is being transmitted to the A6 Wideband assembly. Trace through amplifiers to input of sensor.
Page 184 5790A Service Manual 5-16...
Page 185: List Of Replacable Parts
Chapter 6 List of Replacable Parts Title Page 6-1. Introduction................... 6-3 6-2. How to Obtain Parts................6-3 6-3. Manual Status Information ..............6-3 6-4. Newer Instruments................6-3 6-5. Service Centers ..................6-4 6-6. Parts Lists....................6-4...
Page 186 5790A Service Manual...
Page 187: Introduction
Introduction 6-1. Introduction This chapter contains an illustrated list of replacement parts for the 5790A. Parts are list by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator. The parts lists...
Page 188: Service Centers
Filter PCA 885616 Digital Power Supply PCA 885624 CPU PCA 885629 Rear Panel I/O PCA 885632 6-5. Service Centers A list of service centers is located on www.fluke.com. 6-6. Parts Lists The parts lists are provided on the following pages.
Page 189: A15 A/D Amplifier Pca
FILTER PCA 885616 DIGITAL POWER SUPPLY PCA 885624 CPU PCA 885629 REAR PANEL PCA 885632 5700A-4201,TRANSFORMER/MODULE ASSY 813527 5700A-4210,AC LINE FILTER ASSY 775445 5790A-4244,ASSEMBLY, INPUT BLOCK 1645207 E401 5440A-8197-01,BINDING HEAD, PLATED 102889 F401 FUSE,FUSE,.25X1.25,1.5A,250V,SLOW 109231 F402-403 FUSE,FUSE,.25X1.25,0.75A,250V,SLOW 109256 NUT,NUT,EXT LOCK,STL,6-32...
Page 190 WASHER,WASHER,FLAT,STL,.191,.289,.010 111047 H525 5790A-8027,SPACER 902924 5440A-8198-01,BINDING POST, STUD, PLATED 102707 MP101-102 5790A-8014 GASKET 885715 MP104 5790A-4405,4R01 BASE/CABLE 893321 MP108 5790A-2710,RN/SUBSTRATE ASSY, 4R01 893180 MP301 5700A-8039,CALIBRATION CERTIFICATION DECAL 891718 MP302 5790A-2502,FRONT PANEL, MODIFIED 880737 MP303 5700A-8005,LENS, SHIELD 760843 MP305 5790A-8001,KEYPAD,ELASTOMERIC 1623584 MP306 GROMMET,GROMMET,EXTRUDED,POLYETHYLENE,.085...
Page 191 802306 MP505, MP539 MP420 5700A-8021,FILTER, AIR 813493 MP422-423 5700A-8036,DECAL, CAUTION 240V 760926 MP454-455 6070A-2063,AIDE,PCB PULL 541730 MP504 5790A-4021,SUB-ASSY, REAR PANEL 885582 MP511-512 CONNECTOR ACCESSORY,MICRO-RIBBON,SCREW 854737 LOCK,M3.5,6-32,STEEL,BLACK ZINC MP513-514 CONNECTOR ACCESSORY,D-SUB JACK SCREW,4- 1777348 40,.250 L,W/FLAT WASHER MP540 LABEL,LABEL,VINYL,1.500,.312 844712 MP543-544 WASHER,WASHER,FLAT,SS,.119,.187,.010...
Page 192: Final Assembly
5790A Service Manual Figure 6-1. Final Assembly...
Page 193 List of Replacable Parts Parts Lists Figure 6-1. Final Assembly (Cont)
Page 194 5790A Service Manual Figure 6-1. Final Assembly (Cont) 6-10...
Page 195 List of Replacable Parts Parts Lists Figure 6-1. Final Assembly (Cont) 6-11...
Page 196 5790A Service Manual Figure 6-1. Final Assembly (Cont) 6-12...
Page 197 List of Replacable Parts Parts Lists Figure 6-1. Final Assembly (Cont) 6-13...
Page 198 5790A-3122,PWB, INPUT BLOCK 885637 CORE,CORE,TOROID,FERRITE,.630X1.10X.512 474908 5790A-2021,WIDEBAND CONNECTOR 893193 SLEEVING,SLEEV,POLYOL,SHRINK,.046- 144410 0.05 .023ID,BLACK MP22-23 5725A-2703-11,BINDING POST-RED 886382 MP24 5725A-2703-13,BINDING POST-BLUE 886366 MP25 5725A-2703-14,BINDING POST-GREEN 886374 MP26 5725A-2703-15,BINDING POST-BLACK 886379 SOCKET,SOCKET,1 ROW,PWB,.156CTR,8 POS 886820 W201 5790A-4444,CABLE ASSEMBLY, FRONT INPUT 1645218 6-14...
Page 199 List of Replacable Parts Parts Lists W202 5790A-4406,CABLE, WIDEBAND 893201 Notes 1. Consists of A22, A23 and A24 PCA’s 6-15...
Page 200 5790A Service Manual H26-27 H17-21 (2 PL) H17-21 STEP II MP22 RED MP26 BLK MP24 BLU MP23 STEP III MP25 H35 .40 LG STEP IV H1-10 (5 PL) H23-24 H17-21 .50 LG H17-21 .50 LG STEP V DRAIN 1 H28-29 (2 PL)
Page 201 List of Replacable Parts Parts Lists Table 6-4. A1 Keyboard PCA Part Ref Des Description Qty Notes Number CR1-6 LED, GREEN, SUBMINIATURE 5700A-4401, CABLE, MOTHER BD TO DISPLAY 802694 6-17...
Page 202 5790A Service Manual 5790A-1601 Figure 6-3. A1 Keyboard PCA 6-18...
Page 203 List of Replacable Parts Parts Lists Table 6-5. A2 Front Panel PCA Ref Des Description Part Number Notes CAPACITOR SMR,CAP,TA,47UF,+-20%,10V 746990 C2,C4,C9-20, CAPACITOR SMR,CAP,CER,0.1UF,+- 747287 C28,C30,C35, 10%,25V,X7R,1206 C37,C39-46,C64 C3, C21-27, CAPACITOR SMR,CAP,TA,10UF,+-20%,25V,6032 927814 C29,C31,C36,C38, C47-50,C66 C6,C8,C32,C34, CAPACITOR,CERAMIC,0.01UF,+- 742981 C51-54 20%,100V,X7R,1206,TAPE CAPACITOR ,CAP,AL,10UF,+-20%,100V,SOLV PROOF 820738 C10-11...
Page 204 5790A Service Manual R60,R62,R64,R66 5%,.125W,200PPM,1206 R35-36,R68 RESISTOR SMR,RES,CERM,620,+- 745984 5%,.125W,200PPM,1206 R37-38 RESISTOR SMR,RES,CERM,470,+- 740506 5%,.125W,200PPM,1206 R47-48 RESISTOR SMR,RES,CERM,453,+- 801415 1%,.125W,100PPM,1206 R49-50 RESISTOR SMR,RES,CERM,1.5K,+- 746438 5%,.125W,200PPM,1206 RESISTOR SMR,RES,CERM,200,+- 746339 5%,.125W,200PPM,1206 RESISTOR SMR,RES,CERM,91,+- 756338 5%,.125W,200PPM,1206 R81-82 RESISTOR SMR,RES,CERM,10,+-5%,1W,200PPM,2512 886705 RESISTOR,CERMET,200,+- 886952 5%,0.5W,200PPM,2010,TAPE...
Page 205 List of Replacable Parts Parts Lists 5790A-1602 Figure 6-4. A2 Front Panel PCA 6-21...
Page 206 5790A Service Manual Table 6-6. A3 Analog Motherboard PCA Part Ref Des Description Notes Number C1,C3 CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 LS,RADIAL,TAPE CAPACITOR R05R,CAP,TA,22UF,+-20%,25V 845149 CAPACITOR,R05A,CAP,POLYES,0.001UF,+-10%,50V 720938 C6-7 CAPACITOR R05R,CAP,CER,33PF,+-5%,50V,C0G 714543 CR1-4 BRIDGE,DB101,DIODE BRIDGE,SI,50V,1A,DIP 418582 SURGE PROTECTOR,SURGE PROTECTOR,90V,+-20% 198507 H1-2 SPACER,SPACER,SWAGE,.250 RND,BR,6-32,.625 877063 H3-5 STANDOFF,ROUND,6-32,.375,.250...
Page 207 List of Replacable Parts Parts Lists 5790A-1603 Figure 6-5. A3 Analog Motherboard PCA 6-23...
Page 208 5790A Service Manual Table 6-7. A4 Digiital Motherboard PCA Part Ref Des Description Notes Number C1,C4 CAPACITOR R05R,CAP,TA,10UF,+-20%,35V 816512 CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 LS,RADIAL,TAPE CAPACITOR,CAP,POLYES,0.1UF,+-20%,250VAC 542233 CAPACITOR R05A,CAP,CER,6800PF,+-5%,100V,C0G 816710 CR1-2 BRIDGE,DB101,DIODE BRIDGE,SI,50V,1A,DIP 418582 CR3-4 DIODE,1N4002 A52R,DIODE,SI,100V,1A,DO-41 698555 FUSE ,FUSE,.25X1.25,1.5A,250V,SLOW 109231 H1-2 RIVET,AL,.089 DIA,.344 L,SEMI-TUBULAR,OVAL HEAD...
Page 209 List of Replacable Parts Parts Lists MP22-23 BUMPER,HI-TEMP SILICONE,.44 DIA,.188 THK,ADHESIVE 1601870 P81-82 HEADER,HEADER,1 ROW,.156CTR,20 PIN 831222 RESISTOR A52R,RES,CF,91,+-5%,0.25W 441683 R2-3 RESISTOR,RES,WW,2,+-1%,.7W 255646 RESISTOR,CARBON FILM,68,+-5%,0.25W,+350 TO - 414532 450PPM,AXIAL,TAPE VARISTOR,VARISTOR,430V,+-10%,1.0MA 519355 5700A-4323,POWER SWITCH ASSY 665513 SW2-4 SWITCH,SWITCH,SLIDE,DPDT,LINE SELECT,RT ANG 817353 VR1-2 ZENER,UNCOMP,1N5349B,12V,5%,100MA,5W,AXIAL,BULK 876862 5700A-4408,CABLE, FIBER OPTIC...
Page 210 5790A Service Manual 5790A-1604 Figure 6-6. A4 Digital Motherboard PCA 6-26...
Page 211 List of Replacable Parts Parts Lists Table 6-8. A6 Wideband PCA (Option -03) Part Ref Des Description Notes Number RMS SUPPORT PCA 893268 WB INPUT PROTECTION PCA 893271 C1-3,C5-8,C110 CAPACITOR R05R,CAP,TA,6.8UF,+-20%,10V 655043 C4,C111,C113 CAPACITOR R05R,CAP,TA,22UF,+-20%,10V 658971 C9-19,C21- CAPACITOR R05R,CAP,TA,4.7UF,+-20%,25V 807644 22,C29,C32-34, C36,C40, C1, C84-85...
Page 212 TP11-17 JM1, TP2-3 L5-13,L16-17 CHOKE,38.4UH,6TURN,6160A-8002,BULK 320911 MP5-6 INSULATION PART,INSUL PT,TRANSISTOR,NYL,8PIN 348581 MP7-8 EJECTOR ,EJECTOR,PWB,NYLON 494724 5700A-2064,OSCILLATOR THERMAL COVER 797696 MP10 5790A-2088,SHIELD, WIDEBAND REAR 869081 MP11 5790A-2089,SHIELD, WIDEBAND FRONT 869078 MP12-13 SCREW,6-32,.500,PAN,PHILLIPS,STEEL,ZINC-CLEAR,LOCK 152173 P106,P206 CONNECTOR,DIN41612,TYPE C(M),RT ANG,64 PIN 807800 Q3,Q6 JFET,SI,N,U430,25V,15MA,DUAL,SELECTED,TO-78,BULK 876859...
Page 213 List of Replacable Parts Parts Lists RESISTOR A52R,RES,MF,442K,+-1%,0.125W,100PPM 375956 R25,R29,R35 RESISTOR A52R,RES,MF,49.9,+-1%,0.125W,100PPM 305896 R28,R117,R119, RESISTOR A52R,RES,CF,2M,+-5%,0.25W 442582 R139, R9 RESISTOR,CARBON COMPOSITION,51,+- 157586 5%,1W,AXIAL,TAPE R38,R48,R65,R73, RESISTOR A52R,RES,CF,51,+-5%,0.25W 414540 R83,R96,R99, R105,R143 RESISTOR ,RES,MF,50,+-0.05%,0.125W,15PPM 500264 RESISTOR A52R,RES,MF,154,+-1%,0.125W,100PPM 447987 R45,R87 RESISTOR,METAL FILM,1.27K,\+- 245753 1%,0.5W,100PPM,AXIAL,TAPE R46,R54,R60, RESISTOR A52R,RES,CF,5.1,+-5%,0.25W...
Page 214 BIMOS 5801,IC,BIMOS,8 CHNL HI-VOLT DRVR W/LATCH 782912 CMOS 74HC00,IC,CMOS,QUAD 2 INPUT NAND GATE 707323 VR3-4 ZENER,UNCOMP,1N4730A,3.9V,5%,64MA,1W,DO-41,BULK 535641 ZENER,UNCOMP,1N5256B,30V,5%,4.2MA,500MW,DO- 634121 35,TAPE Z1,Z3 5790A-2703,RN/SUPPORT ASSY-4R03H 885512 5790A-2704,RN/SUPPORT ASSY-4R04H 885517 5790A-2705,RN/SUPPORT ASSY-4R05H 885520 Z5,Z9-10 RESISTOR,RES,CERM,SIP,8 PIN,4 RES,10K,+-2% 513309 RESISTOR,RES,CERM,SIP,8 PIN,7 RES,10K,+-2% 412924 RESISTOR,NETWORK,CERMET,ISOLATED,8 PIN,4 714345 RES,1K,+-2%,0.2W,100PPM,SIP8,BULK...
Page 215 List of Replacable Parts Parts Lists 5790A-1606 Figure 6-7. A6 Wideband PCA (Option -03) 6-31...
Page 216 5790A Service Manual Table 6-9. A6A1 RMS Support PCA Part Ref Des Description Notes Number CAPACITOR R05R,CAP,TA,4.7UF,+-20%,25V 807644 C2,C7-8,C10, CAPACITOR,R05A,CAP,POLYES,0.01UF,+-10%,50V 715037 C12-13,C16, C24-25 C3-4 CAPACITOR,R05A,CAP,POLYES,0.47UF,+-10%,50V 697409 CAPACITOR,R05A,CAP,POLYES,1UF,+-10%,50V 733089 CAPACITOR,R05A,CAP,POLYES,0.047UF,+-10%,50V 820548 C9,C11 CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 LS,RADIAL,TAPE CAPACITOR R05R,CAP,CER,330PF,+-5%,50V,C0G 697441 C15,C17 CAPACITOR R05R,CAP,CER,82PF,+-2%,50V,C0G...
Page 217 List of Replacable Parts Parts Lists BIPOLAR 3096,IC,ARRAY,5 TRANS,5 ISO: 2-PNP,3-NPN 418954 BIPOLAR LT1013C,IC,OP AMP,DUAL,PRECISION,8-PIN 783696 BIPOLAR AD633 ,IC,BPLR,ANALOG MULTIPLIER 845151 ZENER A52R,ZENER,COMP,6.4V,5%,20PPM,4MA 381988 Z1-3 RESISTOR,NETWORK,CERMET,ISOLATED,8 PIN,4 714345 RES,1K,+-2%,0.2W,100PPM,SIP8,BULK Z4-5 RESISTOR,RES,CERM,SIP,8 PIN,4 RES,10K,+-2% 513309 Notes Y Static sensitive part. 6-33...
Page 218 5790A Service Manual 5790A-1696 Figure 6-8. A6A1 RMS Support PCA 6-34...
Page 219 List of Replacable Parts Parts Lists Table 6-10. A6A2 WB Input Protection PCA Part Ref Des Description Notes Number C24-25 CAPACITOR,R05A,CAP,POLYES,0.01UF,+-10%,50V 715037 C84-85 CAPACITOR R05R,CAP,TA,4.7UF,+-20%,25V 807644 CR2-4,CR6-8 DIODE,1N4448 A52R,DIODE,SI,75V,150MA,DO-35 203323 MP1-2 INSULATION PART,INSUL PT,TRANSISTOR MOUNT,DAP,TO-5 152207 P1-2 HEADER,HEADER,2 ROW,.100CTR,RT ANG,12 PIN 806935 PNP,2N2905A ,TRANSISTOR,SI,PNP,60V,600MW,TO-39 402586...
Page 220 5790A Service Manual 5790A-1697 Figure 6-9. A6A2 WB Input Protection PCA 6-36...
Page 221 Parts Lists Table 6-11. A10 Transfer PCA Part Ref Des Description Notes Number PRECISION AMPLIFIER PCA 893300 HIGH VOLTAGE PROTECTION PCA 893305 5790A-7695,ASSEMBLY,HIGH GAIN PRECISION AMP 893313 CAPACITOR,R05A,CAP,POLYES,0.047UF,+-10%,50V 820548 CAPACITOR,R05A,CAP,POLYES,1UF,+-10%,50V 733089 CAPACITOR R05R,CAP,CER,100PF,+-20%,50V,C0G 721605 C4, C9, C21, CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 C24-28,...
Page 222 INDUCTOR,8.2UH,5%,535MADC,828MOHM,SHIELDED,AXIAL,BU 806521 5700A-2064,OSCILLATOR THERMAL COVER 797696 MP2-3 EJECTOR ,EJECTOR,PWB,NYLON 494724 BAG,MYLAR,STATIC SHIELD,OPEN TOP,.0031,10.00,14.00 680967 5700A-2056,SHIELD, HIGH VOLTAGE, REAR 791921 MP13-14 5790A-8024,FOAM, THERMAL COVER 893362 P110,P210 CONNECTOR,DIN41612,TYPE C(M),RT ANG,64 PIN 807800 FET,PWR,N,IRFD120 ,TRANSISTOR,SI,N-MOS,1W,4PDIP 853692 Q2-3 N-JFET,J310 R05R,TRANSISTOR,SI,N-JFET,TO-92 851972 Q4,Q7 MOSFET,SI,N,SD210,30V,50MA,45 OHMS,300MW,DMOS,LOW...
Page 223 List of Replacable Parts Parts Lists R12,R29,R34 RESISTOR,CARBON FILM,100K,+-5%,0.25W,RADIAL,TAPE 658963 R14-15 RESISTOR R05A,RES,MF,75K,+-1%,0.25W,100PPM 851902 RESISTOR,CARBON FILM,62K,+-5%,0.25W,RADIAL,TAPE 713941 RESISTOR R05A,RES,CF,430,+-5%,0.25W 817577 R18-19,R22, RESISTOR R05A,RES,CF,1K,+-5%,0.25W 780585 R24-26,R51, R70-71, R80-81 RESISTOR R05A,RES,MF,100,+-1%,0.25W,100PPM 817627 RESISTOR,METAL FILM,453K,+-1%,0.125W,100PPM,AXIAL,TAPE 295709 RESISTOR,VAR ,RES,VAR,CERM,10K,+-10%,0.5W 285171 RESISTOR,CARBON FILM,62K,+-5%,0.25W,RADIAL,TAPE 713941 R30,R41 RESISTOR,METAL FILM,1.37K,+- 875369 1%,0.125W,50PPM,RADIAL,TAPE...
Page 224 U103 BIPOLAR AD633,IC,BPLR,ANALOG MULTIPLIER 845151 VR1-2 ZENER,UNCOMP,1N5239B,9.1V,5%,20MA,400MW,RADIAL LEAD 853788 PREP,AMMO BOX,DO-35,TAPE VR101 ZENER,A52R,ZENER,COMP,6.4V,5%,20PPM,4MA 381988 SLEEVING,SLEEV,TEFLON,0.027ID,NATURAL 196717 5790A-4337,R-NET ASSY 665539 RESISTOR,RES,CERM,SIP,6 PIN,5 RES,330,+-2% 408302 RESISTOR,RES,CERM,SIP,6 PIN,5 RES,10K,+-2% 500876 RESISTOR,RES,CERM,SIP,6 PIN,5 RES,100K,+-2% 412726 RESISTOR ,RES,CERM,SIP,8 PIN,7 RES,10K,+-2% 412924 Z101-102 RESISTOR,RES,CERM,SIP,8 PIN,4 RES,10K,+-2% 513309 Y Static sensitive part.
Page 225 List of Replacable Parts Parts Lists 5790A-1610 Figure 6-10. A10 Transfer PCA 6-41...
Page 226 5790A Service Manual Table 6-12. A10A1 Precision Amplifier PCA Part Ref Des Description Notes Number C1-2 CAPACITOR SMR,CAP,CER,270PF,+-10%,50V,C0G,1206 837385 CAPACITOR SMR,CAP,TA,4.7UF,+-20%,10V,3528 867262 CAPACITOR,FILM,POLYESTER,0.47UF,+-10%,50V,5MM 913736 PCM,RADIAL,BULK CR1-2,CR5 DIODE,SI,PN,BAV99,70V,215MA,6NS,DUAL,SERIES,SOT-23,TAPE 742320 CR3,CR6 CRD ,I-REG DIODE,2MA,10%,SEL,TO-226AC 284927 CURRENT REGULATOR DIODE,J511,5.3MA,21%,3.1-50V,2 852116 LEAD,TO-92,TAPE STANDOFF,ROUND,6-32,.325 HEIGHT,.250 296137 OD,BRASS,SWAGE,.062 PANEL THK...
Page 227 List of Replacable Parts Parts Lists 5790A-1691 Figure 6-11. A10A1 Precision Amplifier PCA 6-43...
Page 228 5790A Service Manual Table 6-13. A10A2 HV Protection PCA Part Ref Des Description Notes Number CR1-2 DIODE,SI,PN,FDH300,125V,200MA,RADIAL LEAD 844647 PREP,DO-35,TAPE CR3,CR7-8 DIODE,MMBD1501 SMR,DIODE,SI,150V,200MA,SOT- 867072 Q1-4 FET,DMOS,N-CH R05A,TRANSISTOR,SI,N- 782490 DMOS,500V,TO-92 Q5-8 MOSFET,P-CHN R05A,TRANSISTOR,SI,P- 782508 MOS,500V,TO-92 R1-16 RESISTOR SMR,RES,CERM,330K,+- 746776 5%,.125W,200PPM,1206 R17,R20...
Page 229 List of Replacable Parts Parts Lists 5790A-1692 Figure 6-12. A10A2 High Voltage Protection Amplifier PCA 6-45...
Page 230 5790A Service Manual Table 6-14. A10A3 High-Gain Precision Amplifier PCA Part Ref Des Description Notes Number C1,C2 CAPACITOR SMR,CAP,CER,270PF,+-10%,50V,C0G,1206 837385 CAPACITOR SMR,CAP,TA,4.7UF,+-20%,10V,3528 867262 CAPACITOR,FILM,POLYESTER,0.47UF,+-10%,50V,5MM 913736 PCM,RADIAL,BULK C7-11 CAPACITOR SMR,CAP,CER,0.22UF,+80-20%,50V,Y5V,1206 740597 CAPACITOR R05R,CAP,CER,0.22UF,+80-20%,50V,Z5U 733386 CR1-2,CR5 DIODE,SI,PN,BAV99,70V,215MA,6NS,DUAL,SERIES,SOT-23,TAPE 742320 CR3,CR6 CRD,I-REG DIODE,2MA,10%,SEL,TO-226AC 284927 CURRENT REGULATOR DIODE,J511,5.3MA,21%,3.1-50V,2...
Page 231 List of Replacable Parts Parts Lists 5790A-1695 Figure 6-13. A10A3 High-Gain Precision Amplifier PCA 6-47...
Page 232 5790A Service Manual Table 6-15. A15 A/D Amplifier PCA Part Ref Des Description Notes Number C1-2,C4, CAPACITOR,FILM,POLYESTER,0.22UF,\+-5%,50V,5MM 747519 C23,C25, LS,RADIAL,TAPE C3,C21 CAPACITOR R05R,CAP,CER,1000PF,+-20%,50V,X7R 697458 C5-6 CAPACITOR,R05A,CAP,POLYES,1UF,+-10%,50V 733089 C7-8,C12- CAPACITOR R05R,CAP,TA,4.7UF,+-20%,25V 807644 C9,C14 CAPACITOR,R05A,CAP,POLYES,0.01UF,+-10%,50V 715037 CAPACITOR R05R,CAP,CER,4.7PF,+-0.25PF,50V,C0G 721837 CAPACITOR R05R,CAP,CER,470PF,+-5%,50V,C0G 830430...
Page 233 List of Replacable Parts Parts Lists P-JFET R05A,TRANSISTOR,SI,P-JFET,SEL,TO-92 852111 R1,R4, RESISTOR R05A,RES,CF,1K,+-5%,0.25W 780585 R8-9,R17, R28,R31 RESISTOR A52R,RES,MF,33.2K,+-1%,0.125W,100PPM 291393 R3,R6 RESISTOR R05A,RES,CF,2K,+-5%,0.25W 810457 RESISTOR,CARBON FILM,560,+-5%,0.25W,RADIAL,TAPE 810440 RESISTOR R05A,RES,CF,200,+-5%,0.25W 810390 R10,R13, RESISTOR,CARBON FILM,330,+-5%,0.25W,RADIAL,TAPE 830596 R11-12, RESISTOR R05A,RES,CF,10K,+-5%,0.25W 697102 R22,R39 RESISTOR A52R,RES,MF,562,+-0.1%,0.125W,25PPM 375519 RESISTOR A52R,RES,MF,19.6K,+-1%,0.125W,100PPM 293746 R16,R34...
Page 234 ZENER,UNCOMP,1N755A,7.5V,5%,20MA,DO-35,TAPE 256446 ZENER,COMP,1N4567,6.4V,500UA,2%,20PPM,DO-7,BULK 393579 ZENER,UNCOMP,1N965B,15V,5%,8.5MA,400MW,DO-35,TAPE 266601 XU24 SOCKET ,SOCKET,PLCC,68 PIN 876334 CRYSTAL,CRYSTAL,3.84MHZ,+-0.05%,HC-18/U 650390 SATRN-4R03T-N ,RNET,MF,POLY,SIP,FLUKE 45 A TO D CONV 833921 5790A-2711,SUBSTRATE ASSY, 4R02H 893248 Z3-4 54-4111T-N,RNET,MF,POLY,SIP,1752 LO V DIVIDER 645341 5790A-2712,SUBSTRATE ASSY, 4R06H 893250 Y Static sensitive part. Notes...
Page 235 List of Replacable Parts Parts Lists 5790A-1615 Figure 6-14. A15 A/D Amplifier PCA 6-51...
Page 236 35,TAPE CRD ,I-REG DIODE,1MA,10%,SEL,TO-226AC 665448 SCREW,SCREW,PH,P,LOCK,SS,6-32,.500 386128 H9-12 RIVET,AL,.089 DIA,.344 L,SEMI-TUBULAR,OVAL HEAD 320911 5700A-4HR6 ,DC AMP HYBRID ASSY 838516 5790A-4HR9,REFERENCE HYBRID ASSY 761429 CHOKE,38.4UH,6TURN,6160A-8002,BULK 912217 5700A-2018,MOLDED COVER, HYBRID, R-NET 334839 BAG,MYLAR,STATIC SHIELD,OPEN TOP,.0031,10.00,14.00 782565 5700A-2045 ,SHIELD, DAC REAR 797746 5700A-2037 ,MOLDED COVER, REFERENCE HYBRID...
Page 237 List of Replacable Parts Parts Lists Q30,Q32,Q7, JFET,SI,N,SST4416,30V,5MA,500OHMS,SELECTED 806612 RDS(ON),SOT-23,TAPE Q31,Q33,Q35 NPN,MMBT2369 SMR,TRANSISTOR,SI,NPN,40V,300MW,SOT- 844584 PNP,MMBTH81 SMR,TRANSISTOR,SI,PNP,20V,300MW,SOT- 782938 R1,R28,R33, RESISTOR SMR,RES,CERM,4.7K,+-5%,.125W,200PPM,1206 740548 R39,R44 RESISTOR R05A,RES,CF,3K,+-5%,0.25W 816090 RESISTOR A52R,RES,CF,2K,+-5%,0.25W 746610 RESISTOR SMR,RES,CERM,910,+-5%,.125W,200PPM,1206 746354 RESISTOR SMR,RES,CERM,620,+-5%,.125W,200PPM,1206 746297 RESISTOR,CERMET,1.8K,+-5%,0.25W,200PPM,1206,TAPE 810523 R10,R27 RESISTOR,METAL FILM,2.49K,+- 746412 1%,0.25W,100PPM,RADIAL,TAPE RESISTOR SMR,RES,CERM,200,+-5%,.125W,200PPM,1206 810390...
Page 238 5790A Service Manual TP1, TP3, TP8, JUMPER R05R,JUMPER,WIRE,NONINSUL,0.200CTR 816728 TP12 BIFET LF412A,IC,OP AMP,DUAL,LO OFFST VOLT,LO-DRIFT 876367 BIPOLAR LT1013C,IC,OP AMP,DUAL,PRECISION,8-PIN DIP 659516 U5,U38 BIFET LF356N ,IC,OP AMP,JFET INPUT,8 PIN DIP 797720 CMOS 82C54 SMR,IC,CMOS,PROGRMBL INTERVAL 459974 TIMER,PLCC OSCILLATOR,TTL CLOCK,8MHZ,5V,1000PPM,10 TTL 745984...
Page 239: A16 Dac Pac
List of Replacable Parts Parts Lists 5790A-1616 Figure 6-15. A16 DAC PAC 6-55...
Page 240 5790A Service Manual Table 6-17. A16A1 DAC Filter PCA Part Ref Des Description Notes Number C1,C3,C5 CAPACITOR,FILM,POLYESTER,0.33UF,+- 853903 20%,50V,RADIAL,BULK C10-011 CAPACITOR POLYESTER,0.33UF+-5%, 50V,HERMETIC 876367 C12-13,C7-11 CAPACITOR SMR,CAP,CER,0.22UF,+80-20%,50V,Y5V,1206 740597 C1-2 C14, C63 CAPACITOR SMR,CAP,CER,100PF,+-10%,50V,C0G,1206 740571 CR02 DIODE,SI,PN,FJH1100,15V,150MA,RADIAL LEAD PREP,DO- 853523 35,TAPE RESISTOR,CERMET,15K,+-1%,0.25W,100PPM,1206,TAPE...
Page 241 List of Replacable Parts Parts Lists 5790A-1693 Figure 6-16. A16A1 DAC Filter PCA 6-57...
Page 242 5790A Service Manual Table 6-18. A17 Regulator/Guard Crossing PCA Part Ref Des Description Notes Number C1-2,C4,C6-7,C9, CAPACITOR,ELECTROLYTIC,ALUMINUM,10UF,+- 799437 C11-12,C14-15, 20%,50V,SOLV PROOF,2.5MM LS,RADIAL,TAPE C20,C23,C28 C3, C10 CAPACITOR,CAP,CER,0.05UF,+-20%,100V,Z5V 149161 C5,C24,C102 CAPACITOR R02A,CAP,AL,22UF,+-20%,35V,SOLV PROOF 851766 C54, C56, C59-60, CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 C101,C104-107 LS,RADIAL,TAPE C109-110,...
Page 243 CMOS 22V10,IC,PROG ARRAY LOGIC,PRGMD,5790A- 904719 90780 U59,U63 CMOS 74HC4020,IC,CMOS,14 STAGE BINARY COUNTER 807701 BIPLOAR TL7705A,IC,VOLT SUPERVISOR,4.55V SENSE 780577 INPUT IC,MEMORY,SRAM,6264,64KB,8KX8,5V,100NS,DIP28,TUBE 783332 5790A-99264 ,EPROM, PROGRAMMED 27C256, U64 885673 CMOS 2692,IC,CMOS,DUAL ASYNC REC/TRAN,28 PIN 876318 XU58 CONNECTOR,SOCKET,DIP,.300CTR,24 PIN 812198 XU64 CONNECTOR,SOCKET,DIP,.600CTR,28 PIN 448217 6-59...
Page 244 5790A Service Manual CRYSTAL,CRYSTAL,7.3728MHZ,+-1,%,HC-18U 742049 Z1,Z3 RESISTOR,RES,CERM,SIP,8 PIN,4 RES,10K,+-2% 513309 RESISTOR,RES,CERM,SIP,10 PIN,5 RES,10K,+-2% 529990 RESISTOR,RES,CERM,DIP,16 PIN,15 RES,10K,+-5% 355305 RESISTOR,RES,CERM,SIP,8 PIN,4 RES,4.7K,+-2% 573881 Z53-54 RESISTOR,RES,CERM,SIP,10 PIN,5 RES,33,+-2% 622761 RESISTOR,RES,CERM,SIP,6 PIN,5 RES,22K,+-2% 520122 Y Static sensitive part. Notes 6-60...
Page 245 List of Replacable Parts Parts Lists 5790A-1617 Figure 6-17. A17 Regulator/Guard Crossing PCA 6-61...
Page 246 5790A Service Manual Table 6-19. A18 Filter PCA Part Ref Des Description Notes Number C1,C10,C17 CAPACITOR,FILM,POLYESTER,0.22UF,\+-5%,50V,5MM 747519 LS,RADIAL,TAPE C2-3 CAPACITOR,CAP,AL,6800UF,+-20%.25V 782466 C4,C6 CAPACITOR ,CAP,AL,1000UF,+-20%,50V,SOLV PROOF 782391 C5,C19 CAPACITOR,ELECTROLYTIC,AL,2200UF,+-20%,25V,SOLV 782383 PROOF,27X16.5MM,RADIAL,BULK C9,C18 CAPACITOR,ELECTROLYTIC,ALUMINUM,330UF,+- 816785 20%,100V,16.5X27MM,7.5MM LS,RADIAL,BULK CAPACITOR R05A,CAP,AL,220UF,+-20%,25V,SOLV 816793 PROOF C12,C22...
Page 247 List of Replacable Parts Parts Lists R2,R5 RESISTOR A52R,RES,CF,20K,+-5%,0.5W 641099 TP1-6,TP8, JUMPER R05R,JUMPER,WIRE,NONINSUL,0.200CTR 816090 TP10-21 BIPOLAR 7905,IC, VOLT REG,FIXED,-5 VOLTS,0.5 AMPS 816322 IC,VOLTAGE REGULATOR,LINEAR,LM340L,5V,100MA,TO- 816355 39,BULK BIPOLAR 7918,IC,VOLT REG,FIXED,-18 VOLTS,1.5AMPS 845474 VR20-21 ZENER 1N5268B 844977 A52R,ZENER,UNCOMP,82.0V,5%,1.5MA,0.5W Z1-3 RESISTOR,RES,CERM,SIP,10 PIN,5 RES,10K,+-2% 529990 BAG,MYLAR,STATIC SHIELD,OPEN 680967...
Page 248 5790A Service Manual 5790A-1618 Figure 6-18. A18 Filter PCA 6-64...
Page 249 List of Replacable Parts Parts Lists Table 6-20. A19 Digital Power Supply PCA Part Ref Des Description Notes Number CAPACITOR,CAP,AL,470UF,+-20%,160V 816835 CAPACITOR,ELECTROLYTIC,ALUMINUM,10UF,\+- 817064 20%,160V,10.5X17.5MM,5MM LS,RADIAL,BULK CAPACITOR,ELECTROLYTIC,ALUMINUM,330UF,+- 816785 20%,100V,16.5X27MM,7.5MM LS,RADIAL,BULK C4,C9 CAPACITOR R05A,CAP,AL,10UF,+-20%,63V,SOLV PROOF 816843 C5,C11 CAPACITOR R05R,CAP,CER,0.10UF,+-20%,50V,X7R 853650 CAPACITOR ,CAP,AL,10000UF,+-20%,25V 816819 CAPACITOR ,CAP,AL,6800UF,+-20%.25V 782466...
Page 250 5790A Service Manual L1-6 CHOKE,38.4UH,6TURN,6160A-8002,BULK 320911 5700A-6401,INDUCTOR, 33 UH 813485 8840A-6310,TRANSFORMER, PULSE 660589 M1-2 BUMPER,HI-TEMP SILICONE,.44 DIA,.188 THK,ADHESIVE 1601870 MP11-12 GROMMET ,GROMMET,SLOT,RUBBER,.438,.062 853291 MP13-14 EJECTOR,EJECTOR,PWB,NYLON 494724 MP28-29 SCREW,6-32,.250,PAN,PHILLIPS,STEEL,ZINC- 152140 CLEAR,LOCK MP30-31 SPACER ,SPACER,SWAGE,.250 RND,BR,6-32,.125 435578 P119 CONNECTOR,DIN41612,TYPE C(M),RT ANG,64 PIN...
Page 251 List of Replacable Parts Parts Lists ZENER,UNCOMP,1N975B,39V,5%,3.2MA,400MW,DO- 831248 35,TAPE VR14-15 ZENER,UNCOMP,1N967B,18V,5%,7MA,400MW,DO- 327973 35,TAPE Y Static sensitive part. Notes 6-67...
Page 252 5790A Service Manual 5790A-1619 Figure 6-19. A19 Digital Power Supply PCA 6-68...
Page 253 List of Replacable Parts Parts Lists Table 6-21. A20 CPU PCA Part Res Des Description Notes Number BATTERY,PRIMARY,LITHIUM- 821439 MNO2,3.0V,0.560AH,CR2450,COIN,PC PINS,24X5MM,BULK CAPACITOR SMR,CAP,TA,220UF,+-20%,10V,7343H 106021 C2-4,C6-7, CAPACITOR SMR,CAP,CER,0.1UF,+-10%,50V,X7R,0805 690500 C14-16, C18, C101-111,C113, C115, C116, C119-120, C125-133, C142-143,C152 CAPACITOR SMR,CAP,TA,15UF,+-20%,35V,7343 690252 C8-11 CAPACITOR SMR,CAP,CER,22PF,+-1%,50V,C0G,0805 867663 C12-13,C80...
Page 254 5790A Service Manual R58-59 RESISTOR,CERMET,39.2K,+-1%,0.1W,100PPM,0805,TAPE 943092 R60-61 RESISTOR,CERMET,1M,+-1%,0.25W,100PPM,1206,TAPE 836387 SWITCH, MICRO, PUSHBUTTON, SPST, MOMENTARY, 1589043 24VDC@30MA, SMT, TAPE TRANSFORMER,SIGNAL,1:1,0.3-150MHZ,1515,TAPE 690669 TP1,TP3-14 CONNECTOR,TERMINAL,TEST POINT,SMD,510 PH 602125 BRONZE,TAPE BPLR TL7705A SMR,IC,VOLT SUPERVISOR,5V SENSE,SOIC 780502 IC, LOGIC, 74AC05, 2.0V-6.0V, HEX INVERTER W/OPEN DRAIN...
Page 255 List of Replacable Parts Parts Lists 5790A-1620 Figure 6-20. A20 CPU PCA 6-71...
Page 256 5790A Service Manual Table 6-22. A21 Rear Panel I/O PCA Part Ref Des Description Notes Number C1,C3,C5 CAPACITOR R05R,CAP,CER,330PF,+-5%,50V,C0G 697441 C4,C21-22,C24-28, CAPACITOR,FILM,POLYESTER,0.1UF,+-10%,50V,5MM 649913 C40-42,C48-49 LS,RADIAL,TAPE C10,C70 CAPACITOR ,CAP,TA,68UF,+-20%,15V 193615 C11-12 CAPACITOR R05R,CAP,TA,10UF,+-20%,25V 714774 C46,C50 CAPACITOR,ELECTROLYTIC,TANTALUM,1UF,+- 697417 20%,35V,5MM LS,RADIAL,TAPE CONNECTOR,CONN,MICRO-RIBBON,REC,PWB,24 POS...
Page 257 List of Replacable Parts Parts Lists ZENER,UNCOMP,1N750,4.7V,10%,20MA,DO-35,TAPE 387084 CONNECTOR,SOCKET,DIP,.300CTR,24 PIN 812198 Z1-2 RESISTOR,RES,CERM,SIP,10 PIN,9 RES,4.7K,+-2% 484063 RESISTOR,RES,CERM,SIP,6 PIN,5 RES,10K,+-2% 500876 Y Static sensitive part. Notes 6-73...
Page 258 5790A Service Manual 5790A-1621 Figure 6-21. A21 Rear Panel I/O PCA 6-74...
Page 259: Figure Title Page
Chapter 7 Schematic Diagrams Figure Title Page 7-1. A1 Keyboard PCA …………………………………………………….. 7-3 7-2. A2 Front Panel PCA …………………………………………………... 7-5 7-3. A3 Analog Motherboard PCA ………………………………………… 7-10 7-4. A4 Digital Motherboard PCA …………………………………………. 7-14 7-5. A6 Wideband PCA (Option -03) ……………………………………… 7-17 7-6.
Page 260 5790A Service Manual...
Page 261: A1 Keyboard Pca
Schematic Diagrams 5790A-1601 Figure 7-1. A1 Keyboard PCA...
Page 262 5790A Service Manual 5790A-1001 Figure 7-1. A1 Keyboard PCA (cont)
Page 263: A2 Front Panel Pca
Schematic Diagrams 5790A-1602 Figure 7-2. A2 Front Panel PCA...
Page 264 5790A Service Manual 5790A-1002 (1 of 4) Figure 7-2. A2 Front Panel PCA (cont)
Page 265 Schematic Diagrams 5790A-1002 (2 of 4) Figure 7-2. A2 Front Panel PCA (cont)
Page 266 5790A Service Manual 5790A-1002 (3 of 4) Figure 7-2. A2 Front Panel PCA (cont)
Page 267 Schematic Diagrams 5790A-1002 (4 of 4) Figure 7-2. A2 Front Panel PCA (cont)
Page 268: A3 Analog Motherboard Pca
5790A Service Manual 5790A-1603 Figure 7-3. A3 Analog Motherboard PCA 7-10...
Page 269 Schematic Diagrams 5790A-1003 (1 of 3) Figure 7-3. A3 Analog Motherboard PCA (cont) 7-11...
Page 270 5790A Service Manual 5790A-1003 (2 of 3) Figure 7-3. A3 Analog Motherboard PCA (cont) 7-12...
Page 271 Schematic Diagrams 5790A-1003 (3 of 3) Figure 7-3. A3 Analog Motherboard PCA (cont) 7-13...
Page 272: A4 Digital Motherboard Pca
5790A Service Manual 5790A-1604 Figure 7-4. A4 Digital Motherboard PCA 7-14...
Page 273 Schematic Diagrams 5790A-1004 (1 of 2) Figure 7-4. A4 Digital Motherboard PCA (cont) 7-15...
Page 274 5790A Service Manual 5790A-1004 (2 of 2) Figure 7-4. A4 Digital Motherboard PCA (cont) 7-16...
Page 275: A6 Wideband Pca (Option -03)
Schematic Diagrams 5790A-1606 Figure 7-5. A6 Wideband PCA (Option -03) 7-17...
Page 276 5790A Service Manual 5790A-1006 (1 of 4) Figure 7-5. A6 Wideband PCA (Option -03) (cont) 7-18...
Page 277 Schematic Diagrams 5790A-1006 (2 of 4) Figure 7-5. A6 Wideband PCA (Option -03) (cont) 7-19...
Page 278 5790A Service Manual 5790A-1006 (3 of 4) Figure 7-5. A6 Wideband PCA (Option -03) (cont) 7-20...
Page 279 Schematic Diagrams 5790A-1006 (4 of 4) Figure 7-5. A6 Wideband PCA (Option -03) (cont) 7-21...
Page 280: A6A1 Rms Support Pca
5790A Service Manual 5790A-1696 5790A-1096 Figure 7-6. A6A1 RMS Support PCA 7-22...
Page 281: A6A2 Wb Input Protection Pca
Schematic Diagrams 5790A-1697 5790A-1097 Figure 7-7. A6A2 WB Input Protection PCA 7-23...
Page 282: A10 Transfer Pca
5790A Service Manual 5790A-1610 Figure 7-8. A10 Transfer PCA 7-24...
Page 283 Schematic Diagrams 5790A-1010 (1 of 40 Figure 7-8. A10 Transfer PCA (cont) 7-25...
Page 284 5790A Service Manual 5790A-1010 (2 of 4) Figure 7-8. A10 Transfer PCA (cont) 7-26...
Page 285 Schematic Diagrams 5790A-1010 (3 of 4) Figure 7-8. A10 Transfer PCA (cont) 7-27...
Page 286 5790A Service Manual 5790A-1010 (4 of 4) Figure 7-8. A10 Transfer PCA (cont) 7-28...
Page 287 Schematic Diagrams 5790A-1691 5790A-1091 Figure 7-9. A10A1 Precision Ampliﬁ er PCA 7-29...
Page 288 5790A Service Manual 5790A-1692 5790A-1092 Figure 7-10. A10A2 High Voltage Protection PCA 7-30...
Page 289 Schematic Diagrams 5790A-1695 5790A-1095 Figure 7-11. A10A3 High Gain Precision Ampliﬁ er PCA 7-31...
Page 290 5790A Service Manual 5790A-1615 Figure 7-12. A10 A/D Ampliﬁ er PCA 7-32...
Page 291 Schematic Diagrams 5790A-1015 (1 of 3) Figure 7-12. A10 A/D Ampliﬁ er PCA (cont) 7-33...
Page 292 5790A Service Manual 5790A-1015 (2 of 3) Figure 7-12. A10 A/D Ampliﬁ er PCA (cont) 7-34...
Page 293 Schematic Diagrams 5790A-1015 (3 of 3) Figure 7-12. A10 A/D Ampliﬁ er PCA (cont) 7-35...
Page 294 5790A Service Manual 5790A-1616 Figure 7-13. A16 DAC PCA 7-36...
Page 295 Schematic Diagrams 5790A-1016 (1 of 3) Figure 7-13. A16 DAC PCA (cont) 7-37...
Page 296 5790A Service Manual 5790A-1016 (2 of 3) Figure 7-13. A16 DAC PCA (cont) 7-38...
Page 297 Schematic Diagrams 5790A-1016 (3 of 3) Figure 7-13. A16 DAC PCA (cont) 7-39...
Page 298: A16A1 Dac Filter Pca
5790A Service Manual 5790A-1693 5790A-1093 Figure 7-14. A16A1 DAC Filter PCA 7-40...
Page 299 Schematic Diagrams 5790A-1617 Figure 7-15. A17 Regulator/Guard Crossing PCA 7-41...
Page 300 5790A Service Manual 5790A-1017 (1 of 2) Figure 7-15. A17 Regulator/Guard Crossing PCA (cont) 7-42...
Page 301 Schematic Diagrams 5790A-1017 (2 of 2) Figure 7-15. A17 Regulator/Guard Crossing PCA (cont) 7-43...
Page 302: A18 Filter Pca
5790A Service Manual 5790A-1618 Figure 7-16. A18 Filter PCA 7-44...
Page 303 Schematic Diagrams 5790A-1018 (1 of 2) Figure 7-16. A18 Filter PCA (cont) 7-45...
Page 304 5790A Service Manual 5790A-1018 (2 of 2) Figure 7-16. A18 Filter PCA (cont) 7-46...
Page 305: A19 Digital Power Supply Pca
Schematic Diagrams 5790A-1619 Figure 7-17. A19 Digital Power Supply PCA 7-47...
Page 306 5790A Service Manual 5790A-1019 (1 of 2) Figure 7-17. A19 Digital Power Supply PCA (cont) 7-48...
Page 307 Schematic Diagrams 5790A-1019 (2 of 2) Figure 7-17. A19 Digital Power Supply PCA (cont) 7-49...
Page 308: A20 Cpu Pca
5790A Service Manual 5790A-1620 Figure 7-18. A20 CPU PCA 7-50...
Page 309 Schematic Diagrams 5790A-1020 (1 of 5) Figure 7-18. A20 CPU PCA (cont) 7-51...
Page 310 5790A Service Manual 5790A-1020 (2 of 5) Figure 7-18. A20 CPU PCA (cont) 7-52...
Page 311 Schematic Diagrams 5790A-1020 (3 of 5) Figure 7-18. A20 CPU PCA (cont) 7-53...
Page 312 5790A Service Manual 5790A-1020 (4 of 5) Figure 7-18. A20 CPU PCA (cont) 7-54...
Page 313 Schematic Diagrams 5790A-1020 (5 of 5) Figure 7-18. A20 CPU PCA (cont) 7-55...
Page 314: A21 Rear Panel I/O Pca
5790A Service Manual 5790A-1621 Figure 7-19. A21 Rear Panel I/O PCA 7-56...
Page 315 Schematic Diagrams 5790A-1021 (1 of 2) Figure 7-19. A21 Rear Panel I/O PCA (cont) 7-57...
Page 316 5790A Service Manual 5790A-1021 (2 of 2) Figure 7-19. A21 Rear Panel I/O PCA (cont) 7-58...
Page 317: A62 Input Block Assembly
Schematic Diagrams 5790A-1022 Figure 7-20. A62 Input Block Assembly 7-59...
Page 318 5790A Service Manual 5790A-1H01 Figure 7-21. A16HR6 DC Amp Hybrid (on the A16 DAC PCA) 7-60...
Page 319 Schematic Diagrams 5790A-1H42 Figure 7-22. A16HR9 Reference Hybrid (on the A16 DAC PCA) 7-61...
Page 320 5790A Service Manual 7-62...
Page 321: A Glossary Of Ac-Dc Transfer Related Terms
Appendices Appendix Title Page Glossary of AC-DC Transfer Related Terms ............A-1 ASCII and IEEE – 488 Bus Codes..............B-1 Calibration Constant Information................ C-1...
Page 323 A stable object that produces or embodies a physical quantity for use as a reference standard. An artift standard may have an assigned treable value when used for calibration purposes. Fluke 732A DC Voltage Reference Standard and the Fluke 742A Series Standard Resistors are examples. Also see “transfer standard”.
Page 324 5790A Service Manual AC-DC Transfer The process of comparing an AC voltage to a known DC voltage, thereby transferring the low uncertainty of the DC voltage to the AC voltage. The 792A can be used to perform two different types of AC-DC transfers: 1.
Page 325 Appendices Glossary of AC-DC Transfer Related Terms Calibration Report A record of shifts or calibration constant changes that have occurred during calibration. Calibrator A device that supplies outputs with a known uncertainty for use in testing the cury of measurement devices or other sources. Charterization A calibration process that produces a calibration constant or known error for use in correcting the output or reading of an instrument or standard.
Page 326 5790A Service Manual Flatness A measure of output level variation for an voltage source as frequency is varied. Flatness limits are normally specified as a ratio (%) to nominal output level at a reference frequency. Floor Error A contribution to measurement or source uncertainty that is independent of reading or output setting.
Page 327 Appendices Glossary of AC-DC Transfer Related Terms Linearity The relationship between two quantities when a change in the first quantity is directly proportional to a change in the second quantity. Linearity Error Linearity Error occurs when the true output vs. selected output response curve of a calibrator is not extly a straight line.
Page 328 5790A Service Manual Offset Error Same as zero error. The reading shown on a meter when an input value of zero is applied is its offset or zero error. Parameters Independent variables in a measurement process such as temperature, humidity, test lead resistance, etc.
Page 329 Appendices Glossary of AC-DC Transfer Related Terms Resistance A property of a conductor that determines the amount of current that will flow when a given amount of voltage exists ross the conductor. Resistance is measured in ohms. One ohm is the resistance through which one volt of the potential will cause one ampere of current to flow.
Page 330 5790A Service Manual Settling Time The time taken for a measurement device's reading to stabilize after a voltage is applied to the input. Shield A grounded covering device designed to protect a circuit or cable from electromagnetic interference. Also see “guard”.
Page 331 The range of values, usually centered on the indicated or requested value, within which the true, cepted, or consensus value is expected to lie with stated probability or confidence. Fluke uses 99.7 % (3 ) confidence limits. Uncertainty is a quantification of incury.
Page 332 5790A Service Manual Volt The unit of emf (electromotive force) or electrical potential in the SI system of units. One volt is the difference of electrical potential between two points on a conductor carrying one ampere of current, when the power being dissipated between these two points is equal to one watt.
Page 333 Appendix B ASCII and IEEE – 488 Bus Codes Binary ASCII Decimal Octal Dev. No. Message ATN = True Char. 7654 3210 0000 0000 0000 0001 0000 0010 0000 0011 0000 0100 0000 0101 0000 0110 BELL 0000 0111 0000 1000 0000 1001 0000 1010 0000 1011...
Page 334 5790A Service Manual Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0001 0000 0001 0001 0001 0010 0001 0011 0001 0100 0001 0101 0001 0110 0001 0111 0001 1000 0001 1001 0001 1010 0001 1011 0001 1100...
Page 335 Appendices ASCII and IEEE – 488 Bus Codes Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0011 0000 0011 0001 0011 0010 0011 0011 0011 0100 0011 0101 0011 0110 0011 0111 0011 1000 0011 1001 0011 1010 0011 1011 <...
Page 336 5790A Service Manual Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0101 0000 0101 0001 0101 0010 0101 0011 0101 0100 0101 0101 0101 0110 0101 0111 0101 1000 0101 1001 0101 1010 0101 1011 0101 1100...
Page 337 Appendices ASCII and IEEE – 488 Bus Codes Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0111 0000 0111 0001 0111 0010 0111 0011 0111 0100 0111 0101 0111 0110 0111 0111 0111 1000 0111 1001 0111 1010 0111 1011 0111 1100...
Page 338 5790A Service Manual...
Page 339 Defaults are reinstated if you perform a format of the EEPROM ALL or CAL areas. Note Refer to Chapter 2 of the 5790A Service Manual for calibration constant theory of operation. Table C-1. Group ZC_BASIC: Internally Calibrated DAC, Sensor, and A/D Parameters...
Page 340 5790A Service Manual Table C-2. Group FREQ: Frequency Counter Gain Name Default Function FREQ_G (see title) Table C-3. Group DC_DAC: Reference DAC Coarse Channel Gain Name Default Function DAC_G 3017.0 (see title) Table C-4. Group WDC_SENSOR: Wideband Sensor Linearization Name...
Page 341 Appendices Calibration Constant Information Table C-9. Group AC_2_2MV: Flatness Constants, 2.2 mV Range Name Default Function F1_2_2MV (10 Hz) F2_2_2MV (1 kHz) F3_2_2MV (20 kHz) F4_2_2MV (300 kHz) F5_2_2MV (500 kHz) F6_2_2MV (800 kHz) F7_2_2MV (1 MHz) Table C-10. Group DC_7MV: DC Constants, 7 mV Range Name Default Function...
Page 342 5790A Service Manual Table C-14. Group ZC_22MV: More DC Constants, 22 mV Range Name Default Function Z_22MV Zero calibrated DC offset SHO_22MV Shunt input DC offset IA_22MV 0.001 Rough gain (input to A/D ratio) Table C-15. Group AC_22MV Flatness Constants, 22 mV Range...
Page 343 Appendices Calibration Constant Information Table C-19. Group DC_220MV: DC Constants, 220 mV Range Name Default Function DI_220MV 50.0 Basic gain (Ref. DAC to input ratio) OF_220MV Full scale calibrated DC offset Table C-20. Group ZC_220MV: More DC Constants, 220 mV Range Name Default Function...
Page 344 5790A Service Manual Table C-25. Group DC_2_2V: DC constants, mV Range Name Default Function DI_2_2V Basic gain (Ref. DAC to input ratio) OF_2_2V Full scale calibrated DC offset Table C-26. Group ZC_2_2V: More DC Constants, mV Range Name Default Function...
Page 345 Appendices Calibration Constant Information Table C-31. Group DC_7VHF: DC Constants, High Frequency 7 V Range Name Default Function DI_7VHF Basic gain (Ref. DAC to input ratio) Table C-32. Group ZC_7VHF: More DC Constants, High Frequency 7 V Range Name Default Function IA_7VHF 3.16228...
Page 346 5790A Service Manual Table C-38. Group ZC_22VHF: More DC Constants, High Frequency 22 V Range Name Default Function IA_22VHF 10.0 Rough gain (input to A/D ratio) Table C-39. Group AC_22VHF: Flatness Constants, High Frequency 22 V Range Name Default Function...
Page 347 Appendices Calibration Constant Information Table C-44. Group ZC_220V: More DC Constants, 220 V Range Name Default Function Z_220V Zero calibrated DC offset IA_220V 100.0 Rough gain (input to A/D ratio) Table C-45. Group AC_220V: Flatness Constants, 220 V Range Name Default Function F1_220V...
Page 348 5790A Service Manual Table C-50. Group ZC_1000V: More DC Constants, 1000 V Range Name Default Function Z_1000V Zero calibrated DC offset IA_1000V 1000.0 Rough gain (input to A/D ratio) Table C-51. Group AC_1000V: Flatness Constants, 1000 V Range Name Default...
Page 349 Appendices Calibration Constant Information Table C-54. Group WDC_7MV: Gain Constants, Wideband 7 mV Range Name Default Function DI_7MV_WB 1000.0 Basic gain (Ref. DAC to input ratio) IA _7MV_WB Rough gain (input to A/D ratio) Table C-55. Group WAC_7MV: Flatness Constants, Wideband 7 mV Range Name Default Function...
Page 350 5790A Service Manual Name Default Function F6_22MV_WB (200 kHz) F7_22MV_WB (500 kHz) F8_22MV_WB (1 MHz) F9_22MV_WB (2 MHz) F10_22MV_WB (4 MHz) F11_22MV_WB (8 MHz) F12_22MV_WB (10 MHz) F13_22MV_WB (15 MHz) F14_22MV_WB (20 MHz) F15_22MV_WB (26 MHz) F16_22MV_WB (30 MHz) Table C-58. Group WDC_70MV: Gain Constants, Wideband 70 mV Range...
Page 351 Appendices Calibration Constant Information Table C-60. Group WDC_220MV: Gain Constants, Wideband 220 mV Range Name Default Function DI_220MV_WB 31.6228 Basic gain (Ref. DAC to input ratio) IA_220MV_WB 3.16228 Rough gain (input to A/D ratio) Table C-61. Group WAC_220MV: Flatness Constants, Wideband 220 mV Range Name Default Function...
Page 352 5790A Service Manual Name Default Function F6_700MV_WB (200 kHz) F7_700MV_WB (500 kHz) F8_700MV_WB (1 MHz) F9_700MV_WB (2 MHz) F10_700MV_WB B 1.0 (4 MHz) F11_700MV_WB B 1.0 (8 MHz) F12_700MV_WB B 1.0 (10 MHz) F13_700MV_WB B 1.0 (15 MHz) F14_700MV_WB B 1.0...
Page 353 Appendices Calibration Constant Information Table C-66. Group WDC_7V: Gain Constants, Wideband 7 V Range Name Default Function DI_7V_WB Basic gain (Ref. DAC to input ratio) IA_7V _WB 100.0 Rough gain (input to A/D ratio) Table C-67. Group WAC_7V: Flatness Constants, Wideband 7 V Range Name Default Function...
Page 354 5790A Service Manual C-16...

Fluke 5790A Service Manual

Introduction and Specifications

Theory of Operation

Chapter 1

Chapter 2

Calibration and Verification

Chapter 3

Maintenance

Chapter 4

Troubleshooting

Chapter 5

List of Replacable Parts

Figure Title Page

Quick Links

Related Manuals for Fluke 5790A

Summary of Contents for Fluke 5790A

Table of Contents