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Agilent 6800 Series
AC Power Source/Analyzer
Product Note
Using the Agilent Technologies 6800 Series
AC Power Source/Analyzers for Generation
and Measurement
Applications:
• Simulating AC Line Sub-Cycle Dropouts
• Generating MIL-STD-704D Waveforms
• Performing IEC 555-2 Measurements
• Performing Inrush Current Measurements
• Generating User-Defined Waveforms
• Operating the Agilent 6812A and 6813A
at Low Frequencies
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Introduction This note provides information on how you can use the features of the Agilent Technologies 6800 series ac power source/analyzers to address a variety of applications. Although your exact appli- cation may not be listed here, the capabilities described can be generalized and applied to your specific needs. The programming examples are given in QBASIC. These are the capabilities that are discussed and a description of how they can be applied: Table of Contents 3 Introduction to the
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Introduction to the Agilent 6800 AC Power Source/Analyzer The 6800 series ac power source/analyzers are The power analyzer and harmonic analyzer capa- members of the Agilent Technologies “One-Box” bilities provide high precision measurements Solution power products family. These products including: offer an integrated solution for ac power testing applications. • rms, dc, ac+dc voltage and current • peak voltage and current The 6800 series combines the functionality of the • real, apparent, an
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Agilent 6800 Series Output Transients A programmable output value of the ac power What is a STEP Transient? source/analyzer can operate in one of four modes: A Step transient generates a single triggered out- FIXED, Step, Pulse, or List. The default setting is put change (from an immediate output level to FIXED mode, where the output will stay “fixed” at ONE successive output level) of one or more of the the programmed value until another command is output parameters subject to transient control
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Model of the Transient System 5
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Agilent 6800 Series Triggering In ATE applications, triggers are often a conven- What Can Serve as the Source of the Trigger? ient way of synchronizing test system events and The 6800 series can receive triggers from the increasing test throughput. These benefits also following sources: apply to the triggering subsystems in the 6800 series products since these products combine the The GPIB. The computer can send trigger commands capabilities of many test instruments. Each model to the ac power
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Output Transient Trigger Model Measurement Trigger Model 7
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Agilent 6800 Series Measurements The built-in power analyzer capability offers many performs the required calculation to return the voltage, current, and power measurements to the requested measurement parameter. When a new user. While on, the ac power source/analyzers are acquisition of instantaneous output voltage and continuously sampling instantaneous output volt- current data is desired, this command should be age and current for several output cycles and writ- used to return the requested
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The acquisition of voltage and current data can How Can the Acquisition of Voltage and Current also be initiated relative to the acquisition trigger, Data be Controlled? thereby enabling the capture of pre-event and Two characteristics of the voltage and current post-event data. To capture pre-event or post-event acquisition can be controlled: the sample rate, voltage and current data, the offset of data points and the beginning of acquisition relative to the relative to the trigger is program
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Applications The following section contains six application • The details of the implementation of the solution examples. For each application, there is: • A sample program in QBASIC using the National GPIB interface card • An overview of the application • A description of variations on the application • A description of the Agilent 6800 series features (if applicable) used to implement the application • The advantages and benefits of the 6800 series The following table lists the 6800 series fe
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Application 1: Simulating AC Line Sub-Cycle Dropouts Overview of application Implementation details The ability of a switching power supply to main- How the 6800 series implements the dropout tain its output voltage setting in the presence of The computer sends a trigger to the ac power typical ac line disturbances is critical to its end- source/analyzer with a programmable delay of use. If the end-use of the power supply is installa- 5 seconds to ensure that the ac input to the power tion int
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Upon the receipt of the trigger, the ac source 3. The triggered level of the rms voltage can be set continues to output a 120 Vrms, 60 Hz sinewave higher than the initial setting of 120 Vrms to for 5 seconds. After the 5-second trigger delay, simulate a voltage surge. the rms voltage drops to 0 Vrms at 80° of the cycle and then rises back to 120 Vrms (0.001389 4. The rms voltage slew rate can be programmed seconds later) at 110° of the cycle. in Pulse mode to simulate a gradual brown out (sag)
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Application 2: Generating MIL-STD-704D Waveforms Overview of application Agilent 6800 series features used U.S. Military Standard 704D (September 30, 1980) • RMS voltage and frequency control in List mode establishes the requirements of electrical power • RMS voltage slew control transfer between the aircraft or ground support • List dwell time control electrical system, and the electronic equipment • Triggering system to execute the List utilizing this power on board the aircraft. When testing
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Agilent 6800 series setup (continued) • Set the transient trigger source to BUS. • Set the List points as follows: • Initiate the transient trigger. • Enable the output of the ac power source/ List Vrms Dwell analyzer. Point Vrms frequency Slew Time • Send a bus trigger. 1 115 V 400 Hz INF *60 s Upon receipt of the trigger, the List sequence will 2 127 V 400 Hz INF 0.01 s begin and the ac power source/analyzer output will go to the setting represented in the first List step. 3 88 V 400 Hz 566
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List Timing Diagram for Application 2 16
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Application 3: Performing IEC 555-2 Measurements Overview of application Agilent 6800 series features used IEC 555-2 (1982) is a regulatory standard that • RMS Voltage and frequency control pertains to ac line disturbances, namely current • Measurement window control harmonics. These current harmonics are caused by • Harmonic current measurement connecting household appliances and similar elec- trical equipment to a 230 V, 50 Hz ac mains. This Advantages/benefits of the Agilent 6800 series stan
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Agilent 6800 series setup Using the computer: • The ac source output is connected to the ac • Read the harmonic current array into the input of the equipment under test. computer. • Set the output waveform to sine. • Compare the measured harmonic current ampli- • Set the rms voltage to Fixed mode. tudes of harmonic numbers 2 through 40 to the • Set the frequency to Fixed mode. IEC 555-2 quasi-stationary standard limits. • Set the voltage to 230 Vrms. • Set the frequency to 50 Hz. • Set the meas
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