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Fluke 5790B Service Manual

Fluke 5790B
172 pages
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October 2016
© 2016 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
5790B
AC Measurement Standard
Service Manual
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
info@calpower.it www.calpower.it

Table of Contents

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Fluke 5790B Specifications

General IconGeneral
Input Impedance10 MΩ
DisplayLCD
Storage Temperature Range-20 °C to 70 °C
Frequency Range1 MHz
Communication InterfaceIEEE-488
Humidity90% RH
Power Requirements100 V to 240 V, 50/60 Hz

Summary

LIMITED WARRANTY AND LIMITATION OF LIABILITY

Chapter 1 Introduction and Specifications

Introduction

Provides performance tests, calibration, theory of operation, troubleshooting, and repair.

Contact Fluke Calibration

Lists telephone numbers and website for contacting Fluke Calibration for support.

Safety Information

Identifies conditions and procedures dangerous to the user or product.

Symbols

Lists symbols used on the instrument and in the manual for clarity.

Specifications

Details specifications for warm-up time, temperature, humidity, altitude, etc.

General Specifications

Lists general operational parameters like warm-up time, humidity, altitude, and temperature.

Resolution and Range Limits

Details voltage ranges and their corresponding resolution and limits.

Electrical Specifications

Describes absolute and relative specifications including stability, temp, humidity, and linearity.

Absolute AC Voltage

Provides detailed AC voltage specifications across various ranges and frequencies.

Relative AC Voltage

Specifies relative AC voltage accuracy across ranges, frequencies, and time.

Absolute AC Non-sine Voltage

Details specifications for non-sinusoidal AC voltage measurements.

Absolute DC Voltage

Lists absolute DC voltage specifications for various ranges and measurement modes.

Relative DC Voltage

Specifies relative DC voltage accuracy for various ranges and measurement modes.

Secondary Electrical Specifications

Provides secondary performance specifications for AC and DC measurements.

AC Secondary Performance

Provides AC secondary performance specs like stability, temp coefficient, and input resistance.

DC Secondary Performance

Lists DC secondary performance specifications such as temperature coefficient and input resistance.

Operating Characteristics

Details parameters like non-destructive input, isolation, volt-hertz product, and frequency accuracy.

AUX Input Characteristics

Describes AUX input usage with current shunts and its specifications.

Absolute Wideband Specifications (5790B/3, 5790B/5, and 5790B/AF)

Provides absolute wideband specifications including flatness and temperature coefficient.

Chapter 2 Theory of Operation

Introduction

Describes the product as an automated AC-DC transfer standard and its critical elements.

Functional Block Diagram Discussion

Explains the functional block diagram of the AC-DC transfer process.

Digital Section Overview

Describes the components of the unguarded digital section of the product.

Analog Section Overview

Lists and describes the assemblies within the guarded analog section of the product.

System Interconnect Detailed Circuit Description

Details the interconnectivity and function of key assemblies.

Digital Motherboard Assembly (A4)

Describes the functions and components of the digital motherboard assembly.

Transformer Assembly (A22)

Explains the role of the transformer assembly in power supply creation.

Analog Motherboard Assembly (A3)

Details the connectors and components on the analog motherboard assembly.

Digital Section Detailed Circuit Description

Provides detailed descriptions of each assembly in the digital section.

CPU Assembly (A20)

Describes the CPU assembly's microprocessor, OS, and microcontroller.

Front-Panel Assembly (A2)

Details the components of the front-panel assembly like keypad and USB port.

Terminal LED Indicator Assembly (A25)

Describes the LED indicator board and its components.

Analog Section Detailed Circuit Description

Provides detailed descriptions of each assembly in the analog section.

Filter Assembly (A18)

Explains the function of the filter assembly in processing AC inputs.

Regulator/Guard Crossing Assembly (A17)

Describes the dual functions of voltage regulation and digital controller for the guard.

Transfer Assembly (A10)

Details the components of the transfer assembly including switches and amplifiers.

A/D Amplifier Assembly (A15)

Explains circuitry for DC reference generation and thermal sensor measurement.

DAC Assembly (A16)

Describes the DAC's adjustable DC voltage output and pulse-width modulation.

Wideband Module (A6)

Explains how the wideband module extends operating range and its input impedance.

Chapter 3 Calibration Adjustment and Verification

Introduction

Defines calibration methods and step-by-step procedures for main and wideband inputs.

Calibration Cycle

Explains how calibration cycle selection affects specifications and reports.

Calibration Reports

Describes how calibration reports show shifts and can be saved.

Save Calibration Reports

Details how to create and export calibration reports to a USB flash drive.

Calibration Adjustment Security Passcode

Explains the security passcode for saving calibration constants and its management.

Full or Range Calibration Adjustment

Describes performing full or range calibration for DC and AC functions.

Automating Calibration Adjustment and Verification

Discusses using an automated system for calibration procedures.

How Calibration Memory is Organized

Explains the organization of calibration constants in memory (active, stored, old sets).

Calibration

Guides on calibrating the Product to external standards using various methods.

Calibrating (Calibration Adjustment) the Main Input

Outlines the sequence of procedures for calibrating the main input.

Characterizing the DC Source

Explains how to characterize the DC source for main input DC calibration.

Self-Calibrate a Fluke 752A Divider with a Fluke 8508A as the Null Detector

Provides step-by-step instructions for self-calibrating the 752A divider.

DC Voltage Source Characterization Values

Details the values obtained from self-calibration of the reference divider.

DC Calibration Adjustment

Lists equipment required and procedures for DC calibration adjustment of the main input.

Calibration Steps in Calibration Adjustment

Details the steps and purpose for calibrating various DC voltage ranges.

AC Calibration Adjustment

Lists equipment and procedures for performing AC calibration of the main input.

Calibrate the Wideband AC Option

Outlines the four main steps for calibrating the Wideband AC option.

Characterizing the AC Source

Explains how to characterize the AC source for Wideband input calibration.

Calibration Adjustment of Wideband Input Gain at 1 kHz

Provides steps for performing gain calibration adjustment at 1 kHz for each range.

Calibration Adjustment of Wideband Input Flatness

Details the procedure for verifying Wideband input flatness.

Calibration Adjustment of AF Option

Describes calibration of the AF option, performed via remote commands.

Calibration Verification

Covers verification of main input and Wideband input performance.

Verifying the DC Voltage Performance of the Main Input

Explains how to verify the DC voltage performance of the main input.

Verifying the Main Input (INPUT 1 or 2)

Details measurements and calculations for main input verification across different regions.

Verifying AC-DC Difference for Regions I and III (220 mV through 1000 V Range)

Explains how to calculate AC-DC difference error for specific voltage ranges.

Verifying Absolute AC Error for Region IV (70 mV through 700 mV Range)

Describes how to verify absolute AC error for specific voltage ranges.

Verifying Absolute AC Error for Region II (2.2 V through 1000 V Range)

Outlines a method to determine absolute AC error by combining DC and AC-DC errors.

Verifying Absolute AC Error for Region V (2.2 mV through 22 mV)

Explains a bootstrapping technique to verify absolute AC error for low voltage ranges.

Verifying the Wideband AC Option

Details procedures for verifying the 5790B Wideband input tolerance.

Wideband 1-kHz Gain Verification

Describes verifying the gain of the Wideband input at 1 kHz.

Wideband Gain Verification, 10 Hz to 500 kHz

Explains how to determine gain errors at frequencies other than 1 kHz.

Wideband Flatness Verification

Details the procedure for verifying the Wideband input flatness.

Verification of AF Option

Describes verification of the AF option's calibration performance.

Update Full Verification Date

Explains how to manually update the full verification date after calibrations.

Chapter 4 Maintenance

Introduction

Discusses avoiding component-level repair and focusing on module replacement.

Clean the Exterior

Provides instructions for cleaning the case, keys, and lens using a soft cloth.

Fuse Replacement

Details the procedure for accessing and replacing fuses from the rear panel.

Clean the Air Filter

Explains how to clean the air filter to prevent overheating and maintain performance.

Access Procedures

Provides step-by-step procedures for accessing internal components.

Top and Bottom Covers

Describes how the top and bottom covers are secured and removed.

Digital Section Cover

Explains how to access the digital section by removing its top cover.

Analog Section Covers

Details the removal of separate covers for the analog section.

Rear Panel Removal and Installation

Provides steps for removing and installing the rear panel assembly.

Front Panel Removal and Installation

Details the procedure for removing and installing the front panel.

Display Assembly Removal and Installation

Explains how to remove and install the display assembly after front panel removal.

Keyboard Assembly Removal and Installation

Provides steps for removing and installing the keyboard assembly.

Analog Assembly Removal and Installation

Describes removing analog assemblies after covers are off.

A20 CPU Assembly Removal and Installation

Details the removal and installation of the CPU assembly.

Power Transformer Removal and Installation

Provides steps for removing and installing the power transformer assembly.

Fan Removal and Installation

Explains how to remove and install the unit's fans.

Error Codes

Lists and categorizes product error codes for troubleshooting.

0-Level Faults: Error handling

Lists basic error codes related to error handling.

100-Level Faults: Self-calibration

Lists error codes associated with self-calibration failures.

200-Level Faults: Hardware configuration

Lists error codes related to hardware configuration issues.

300-Level Faults: Inguard processor

Lists error codes related to the inguard processor.

400-Level Faults: Self-diagnostics

Lists error codes related to self-diagnostic tests.

500-Level Faults: Instrument state

Lists error codes related to the instrument's operational state.

600-Level Faults: Firmware updater

Lists error codes related to the firmware updater.

Chapter 5 List of Replacable Parts

Introduction

Introduces the chapter on replacement parts and the information provided.

How to Obtain Parts

Provides information on ordering replacement parts from Fluke Calibration.

Final Assembly

Lists final assembly parts with reference designators, part numbers, and quantities.

Sheet Metal Kit

Lists parts included in the sheet metal kit.

Appendices

Appendix A Glossary of AC-DC Transfer Related Terms

Provides definitions for terms related to AC-DC transfer measurements.

Absolute Uncertainty

Defines absolute uncertainty, including contributions from all sources.

Accuracy

Defines accuracy as the degree of agreement with a true value.

Artifact Calibration

Describes calibration using artifact standards to reduce external requirements.

Artifact Standard

Defines an artifact standard as a stable object for reference.

AC-DC Absolute Uncertainty

Details error sources contributing to AC-DC difference correction uncertainty.

AC-DC Transfer

Explains the process of comparing AC voltage to known DC voltage.

AC-DC Difference

Defines AC-DC difference as a measure of transfer device accuracy.

Base Units

Defines SI base units, noting ampere as the only electric base unit.

Buffer

Describes buffer as digital memory or an amplifier stage.

Burden Voltage

Defines burden voltage as maximum sustainable voltage across a load.

Calibration

Defines calibration as comparison to a known standard.

Calibration Constant

Defines calibration constant as a coefficient for adjusting output or reading.

Calibration Curve

Defines calibration curve as a smooth curve through calibration points.

Calibration Interval

Defines calibration interval as the period for maintaining performance.

Calibration Report

Defines calibration report as a record of calibration changes.

Calibrator

Defines a calibrator as a device supplying outputs for testing accuracy.

Characterization

Defines characterization as a process for producing calibration constants.

Common Mode Noise

Defines common mode noise as an undesired signal between terminals and ground.

Compliance Voltage

Defines compliance voltage as the max voltage from a constant-current source.

Confidence Level

Defines confidence level as a percentage indicating assurance.

Control Chart

Defines a control chart for monitoring process deviations.

Crest Factor

Defines crest factor as the ratio of peak to RMS voltage.

DAC (Digital-to-Analog Converter)

Defines DAC as a device converting digital to analog voltage.

Derived Units

Defines derived units in the SI system.

Distribution Function

Defines distribution function as a relationship between values and frequencies.

Drift

Defines drift as gradual change in a value over time.

Error

Defines error as deviation from the correct value.

Flatness

Defines flatness as output level variation with frequency.

Floor Error

Defines floor error as an uncertainty independent of reading.

Full Scale

Defines full scale as the upper limit for uncertainty specification.

Gain Error

Defines gain error as a deviation in the slope of output vs true output.

Ground

Defines ground as the voltage reference point in a circuit.

Ground Loop

Defines ground loop as undesirable current induced by multiple chassis grounds.

Guard

Defines guard as a floating shield for sensitive circuitry.

International System of Units

Defines SI System of Units as the accepted international system.

Legal Units

Defines legal units as the highest echelon in a system of units.

Life-Cycle Cost

Defines life-cycle cost considering all elements contributing to instrument cost.

Linearity

Defines linearity as the relationship between two quantities.

Linearity Error

Defines linearity error when output curve deviates from a straight line.

MAP (Measurement Assurance Program)

Defines MAP as a program for demonstrating measurement uncertainty.

Maximum Transfer Time

Defines maximum time for AC-DC transfer within specified uncertainty.

Metrology

Defines metrology as the science concerned with measurement.

Minimum V(Sub)in

Defines minimum input voltage for uncertainty specifications.

Minimum Use Specifications

Defines specifications computed to satisfy calibration requirements of a UUT.

Noise

Defines noise as an undesirable signal superimposed on a desired signal.

Noise Floor

Defines noise floor for AC-DC transfer due to noise factors.

Nonvolatile Memory

Defines nonvolatile memory as retaining contents when power is off.

Normal Mode Noise

Defines normal mode noise as an undesired signal between terminals.

Offset Error

Defines offset error as the reading when input value is zero.

Parameters

Defines parameters as independent variables in measurement.

Precision

Defines precision as the degree of agreement in measurements.

Predictability

Defines predictability of a device's time-behavior.

Primary Standard

Defines a primary standard as one maintained by authority.

Process Metrology

Defines process metrology as tracking accuracy drift.

Random Error

Defines random error as unpredictable variation in measurements.

Range

Defines range as stated upper limits for uncertainty specifications.

Reference Standard

Defines reference standard as the highest-echelon standard in a laboratory.

Relative Uncertainty

Defines relative uncertainty as specifications relative to a reference value.

Reliability

Defines reliability as a measure of probability of failure.

Repeatability

Refers to 'precision'.

Resistance

Defines resistance and its measurement in ohms.

Resolution

Defines resolution as the smallest change detectable by a system.

Reversal Error

Defines reversal error as difference in AC-DC transfer output with reversed polarity.

RF (Radio Frequency)

Defines RF frequency range.

RMS (Root-Mean-Square)

Defines RMS value as equivalent power dissipation to DC value.

RMS Sensor

Defines RMS sensor as a device measuring RMS value by heat generation.

Scale

Defines scale as the absolute span of a reading range.

Scale Error

Refers to 'gain error'.

Secondary Standard

Defines a secondary standard maintained by comparison to a primary standard.

Sensitivity

Defines sensitivity as the degree of response to input quantity change.

Settling Time

Defines settling time as time for reading to stabilize after voltage application.

Shield

Defines shield as a grounded covering for protection from interference.

SI System of Units

Defines SI System of Units as the accepted international system.

Specifications

Defines specifications as a precise statement of performance.

Square Law

Defines square law where output is proportional to the square of the stimulus.

Stability

Defines stability as freedom from drift relative to a reference value.

Standard

Defines standard as a device used for reference and comparison.

Standard Cell

Defines standard cell as a primary cell serving as a voltage standard.

Systematic Error

Defines systematic error as constant or predictable error.

Temperature Coefficient

Defines temperature coefficient as a factor for calculating temperature change effects.

Test Uncertainty Ratio

Defines test uncertainty ratio as the numerical ratio of uncertainties.

Thermal EMF

Defines thermal EMF as voltage generated when dissimilar metals are heated.

Traceability

Defines traceability as relating measurement results to national standards.

Transfer

Refers to 'AC-DC transfer'.

Transfer Error

Defines transfer error as error induced by comparing instruments.

Transfer Stability

Defines transfer stability as change in AC-DC difference correction over time.

Transfer Standard

Defines transfer standard used to compare devices.

Transport Standard

Defines transport standard as a rugged transfer standard for shipment.

True Value

Defines true value as the accepted or correct value of a quantity.

Uncertainty

Defines uncertainty as the range of values where the true value is expected to lie.

Units

Defines units as symbols or names defining measured quantities.

UUT (Unit Under Test)

Defines UUT as an abbreviated name for an instrument being tested.

Volt

Defines volt as the SI unit of electromotive force.

Verification

Defines verification as comparison to determine variation from required performance.

Working Standard

Defines working standard used in routine calibration and comparison.

Zero Error

Defines zero error as offset error when input value is zero.

Appendix B ASCII and IEEE – 488 Bus Codes

Provides ASCII and IEEE-488 bus codes for communication.

Appendix C Calibration Constant Information

Lists calibration constants organized by group for instrument configuration.

Group ZC_BASIC

Lists basic calibration constants for DAC, A/D, and sensor components.

Group FREQ

Lists calibration constants related to frequency counter gain.

Group DC_DAC

Lists calibration constants for the DC DAC.

Group WDC_SENSOR

Lists autogenerated calibration constants for wideband DC sensors.

Group AC_LINEARITY

Lists calibration constants for AC linearity correction.

Group RIPPLE

Lists calibration constants for ripple correction.

Group FACTORY

Lists factory calibration constants for wideband impedance and shunt measurements.

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