ADDENDUM to the Agilent 6811B, 6812B, and 6813B User’s Guide and Programming Guide for the Dual Power Analyzer Option 020/022 Agilent P/N 5964-8134 Microfiche No 5964-8135 Printed in U.S.A.
Contents Agilent Dual Power Analyzer Description 3 Rear Panel Connections 5 Installation 5 Front Panel Programming 8 Additional Measurement Commands 10 Additional Sense Commands 12 Additional Frequency Modulation Commands 13 Additional Calibration Commands 14 Behavior Differences of Existing SCPI Commands 15 Programming Example 16 Using the Power Analyzer Input with the GUI 17 Power Analyzer Input Specifications 20 Verification and Calibration for Option 020/022 22 Verification Pro
Agilent Dual Power Analyzer Description The Agilent Technologies Dual Power Analyzer Option 020 is available on the following ac sources: Agilent 6811B AC Power Source (375VA) Agilent 6812B AC Power Source (750VA) Agilent 6813B AC Power Source (1750VA) Agilent 6813B Option 019 AC Power Source (2000VA) Option 020 consists of an additional Power Analyzer input on the back of the ac source, an external current shunt, and a cable to connect the current shunt to the ac source.
Front Panel Menus - Additions The Power Analyzer input uses the same front panel menu commands that are used to measure the Main Output of the ac source. These are documented in the ac source User’s Guide. The following menu commands have been added to let you access the Power Analyzer input, control the output frequency modulation, and calibrate the Power Analyzer input. In most cases you will need to press the ô Function key multiple times to access the menu item.
Rear Panel Connections Power Analyzer input. Connector plug is removable. LO HI I SENSE HP-IB LO HI ..... RS 232 V SENSE _ FLT INH + - + _ .... WARNING CAUTION TRIGGER IN 1 OPTIONS LINE RATING OUT 1 WARNING SENSE COM COM _ _ O1 _ _ O1 L1 _ _ 300 VAC MAX TO L 2( N ) Rear Panel, Overall View Installation Turn the unit off before connecting any wires. The Power Analyzer input to the ac source has both voltage and current sense inputs.
LO HI I SENSE LO HI V SENSE HI LO V SENSE I SENSE HI LO CONNECTOR (AC SOURCE END) HOODS PLACED OVER WIRES AND CONNECTORS CONNECTOR (SHUNT END) WARNING, SAFETY HAZARD: Connector hoods must be installed on connectors. Connector screw terminals are at line potential during operation.
External Shunt Line and Load Connections The Agilent supplied current shunt has both input (line) and output (load) connectors. The customer must supply the cables to connect the ac lines to and from the external current shunt. Agilent supplies one hooded cable cover for the input of the ac source and two hooded cable covers for the shunt. All three of these covers are assembled and installed in the same way. It is the customer’s responsibility to use these covers when making line cable connections.
Check the External Current Shunt Setting After you have completed your cable connections, you can turn on and check out the ac source as described in the Turn-On Checkout chapter in the ac source User’s Guide. One additional step in checking out a unit with Option 020/022 installed, is to make sure that the correct shunt value has been entered in the unit. To check the shunt value setting, proceed as follows: Action Display 1. Turn on the ac source and wait for the unit to finish its internal selftest.
Using the Front Panel Display with the Power Analyzer Input To select the measurement source: Action Display Press Meter to return the display to Meter mode. Press Phase Select at any time to toggle between the Main Output and the Power Analyzer input. The left-most digit of the front panel display will indicate either "φ1" for the Main Output, or "φ2" for the Power Analyzer input.
Additional Measurement Commands The following additional measurement commands are provided with the Agilent Dual Power Analyzer Option 020/022. These measurement commands are optimized for use in specific applications such as evaluating uninterruptible power supplies. In this application the new commands can be used to measure transfer time, peak voltage, and phase locked loop performance of the UPS. NOTE: All MEASure and FETCh commands apply to both the Main Output and the Power Analyzer input.
MEASure:TVOLt:ABSolute? FETCh:TVOLt:ABSolute? Returns the time at which the absolute value of the measured voltage first exceeds level, with the following qualifications: The behavior of the signal before start_ time is ignored, and the absolute value of the voltage must remain above level for at least the specified min_ pulse_ width. Both start_ time and the return value are with respect to the start of the measurement buffer.
Additional Sense Commands The following additional sense commands are provided with the Agilent Dual Power Analyzer Option 020/022. These commands let you select a measurement source and the frequency measurement channel for the Power Analyzer input. SENSe:NSELect Selects the measurement source that will return data when a query is sent. A parameter value of 1 selects the Main Output, which measures the actual output voltage and current of the ac source.
Additional Frequency Modulation Commands The following SCPI commands are used to program the output frequency of the ac source. These commands apply only to the Main Output of the ac source and do not affect the measurement capability of the unit. These commands are only provided with the Agilent Dual Power Analyzer Option 020/022. FM Turns off or on frequency modulation of the Main Output. Frequency modulation operates only if FREQuency:MODE is set to FIXed.
Additional Calibration Commands The following SCPI commands are used to calibrate the Power Analyzer input and external current shunt: CALibrate:VOLTage:EXTernal Initiates calibration of the external voltage measurement. Command Syntax CALibrate:VOLTage:EXTernal Parameters None Examples CAL:VOLT:EXT CALibrate:CURRent:EXTernal Initiates calibration of the external current measurement.
Behavior Differences of Existing SCPI Commands This section documents the behavior differences of existing SCPI commands when the Power Analyzer input is selected or is active. MEASure | FETCh All standard ac source MEASure or FETCh functions are available for the Main Output of the ac source as well as the Power Analyzer input. The SENSe:NSELect command selects the measurement source that will return data.
Programming Example UPS Transfer Time Measurement The following programming example illustrates how to use the ac source with the Dual Power Analyzer Option 020/022 to measure transfer time on a UPS. Transfer time is defined as the time it takes a UPS to go from online-operation to battery-backup operation when the ac line fails. This example starts with the ac source output voltage (UPS input voltage) at 120 Vac. The UPS output voltage is connected to a load and to the Power Analyzer input.
Using the Power Analyzer Input with the GUI The Agilent AC Source Graphical User Interface (GUI) is an easy to use soft front panel for the Agilent 6800-series AC Power Source/Analyzers. It is supplied with your ac source. With it, you can also control the Power Analyzer input on the back of the unit. Instructions to install and run the Graphical User Interface are provided in the Quick Start Guide that accompanies the software. Briefly: 1. Place Disk #1 in the A: drive of your computer and run SETUP.EXE.
If you have both the Main Output and the Power Analyzer input displayed, the Main window should display both waveforms, as illustrated in the following screen shot. Making a Voltage Phase Difference Measurement The voltage phase difference measures the phase difference between the output of the ac source and the output of a UPS after ac power is restored following an ac line dropout. This measurement requires that the output of the UPS be connected to the Power Analyzer input.
In the dialog box that appears on the screen, enter values for the indicated parameters. The test uses these parameters to make the measurement. For a detailed explanation of the Voltage Phase Difference parameters refer to the online help by pressing the F1 key. When you are ready to make the measurement, press Measure. Performing a Transfer Time Test The transfer time test measures the time it takes the UPS to go from online-operation to battery backup operation when the ac line fails.
Power Analyzer Input Specifications Table A-1 lists the specifications of the Agilent Dual Power Analyzer Option 020/022. Performance specifications are warranted over the ambient temperature range of 0 to 40 oC. Unless otherwise noted, specifications are for a sinewave with a resistive load at a frequency range of 45 Hz to 1 kHz, with the Agilent supplied current shunt, after a 30-minute warmup. Table A-1.
Table A-2. Supplemental Characteristics 300 Vrms/425 Vdc Isolation to Ground: Measurement Ranges AC Voltage: DC Voltage: Current: 0−300 Vrms ± 425 V ± 80 A peak (high range) ± 8 A peak (low range) 13 A rms max. continuous rms Voltage: rms Current: 10 mV 2 mA 5% of reading + 0.
Verification and Calibration for Option 020/022 This section includes verification and calibration procedures for the Agilent Dual Power Analyzer Option 020/022. Add these procedures to those described in Appendix B of the AC Source User’s Guide. The verification procedures do not check all the operating parameters, but verify that the ac source is performing properly. Performance Tests, which check all the specifications of the ac source, are given in the applicable ac source Service Manual.
Verification Procedure The following verification procedures assume you understand how to operate the ac source from the front panel as explained in chapter 4. Perform the following tests for operation verification in the order indicated. 1. Turn-On Checkout 2. Voltage Measurement Accuracy 3. Current Measurement Accuracy NOTE: The ac source must pass turn-on selftest before you can proceed with the verification.
Power Analyzer Voltage Measurement Accuracy This test verifies the accuracy of the Power Analyzer voltage measurements. The Phase 2 annunciator on the left side of the display, must be on for the front panel to display Power Analyzer input measurements. Figure B-1A shows the setup. Measure the ac output voltage directly at the output terminals. Action Normal Result 1. Make sure the ac source is turned off. Connect the DVM to the output terminals the ac source.
Calibration Procedure Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup. The following procedures assume you understand how to operate front panel keys (see chapter 4). WARNING LETHAL VOLTAGES. Ac sources can supply 425 V peak at their output. DEATH on contact may result if the output terminals or circuits connected to the output are touched when power is applied.
Calibrating and Entering Power Analyzer Voltage Calibration Values Action 4. Connect an Agilent 3458A DVM (in synchronous ac volts mode) to the ac source output terminals. Short the Power Analyzer voltage terminals (V SENSE) to ensure no dc offset error. 5. Press Shift Calibration, scroll to CAL VOLT EXT, and press Enter. 6. Leave the ac source on and remove the short from the Power Analyzer voltage terminals. 7.