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User’s Guide AC Power Solutions Agilent Models 6811B, 6812B, and 6813B For instruments with Serial Numbers: Agilent 6811B: US38390101-up Agilent 6812B: US38390101-up Agilent 6813B: US38390101-up Agilent Part No.
2 Warranty Information CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory.
3 Safety Summary The f ollowin g g eneral sa f et y p recautions must be observed duri n g all p hases o f o p eration o f this instrumen t. Failure to com p l y with these p recautions or with s p eci f ic warnin g s els ewhere in thi s manual violates s a f et y standards o f desi g n, manu f acture, and int ended use o f the instrument.
4 SAFETY SYMBOLS Direct current Alternating current Both direct and alternating current Three-phase alternating current Earth (ground) terminal Protective earth (ground) terminal Frame or chassis terminal Terminal is at earth potential. Used for measurement and control circuits designed to be operated with one terminal at earth potential.
5 Declaration Page DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies, Inc. Manufacturer’s Address: 140 Green Pond Road Rockaway, New Jersey 07866 U.
6 Acoustic Noise Information Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenl ä minformationsverordnung vom 18 Januar 1991. * Schalldruckpegel Lp <70 dB(A) * Am Arbeitsplatz * Normaler Betrieb * Nach EN 27779 (Typpr ü fung).
7 Table of Contents Warranty Information 2 Safety Summary 3 Declaration of Conformity 5 Acoustic Noise Information 6 Printing History 6 Table of Contents 7 1 GENERAL INFORMATION 11 Document Orientatio.
8 3 TURN-ON CHECKOUT 31 Introduction 31 Preliminary Checkout 31 Using the Keypad 32 Checkout Procedure 32 In Case of Trouble 34 Error Messages 34 Line Fuse 35 4 FRONT PANEL OPERATION 37 Introduction 3.
9 Enable Calibration Mode 72 Calibrating and Entering Voltage Offset Values 72 Calibrating and Entering DC Voltage Gain Values 73 Calibrating and Entering AC rms Voltage Gain Values 73 Calibrating the.
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11 1 General Information Document Orientation This manual describes the operation of the Agilent 6811B/6812B/6813B AC Power Solutions. These units will be referred to as "ac sources" throughout this manual.
1 - General Information 12 Earlier AC Source Models With the exception of some minor readback specification differences, information in this manual also applies to the following earlier ac source mode.
General Information - 1 13 The following table lists some common user-replaceable parts: Table 1-2. Operator Replaceable Parts Item Agilent Part Number Power cord assembly see "Options" Rack.
1 - General Information 14 The following model ac power sources are described in this User’s Guide: Model Description Agilent 6811B 0-300 V rms; 375 VA (425 V peak; 40 A peak) Agilent 6812B 0-300 V .
General Information - 1 15 Remotely programming is accomplished from either the GPIB bus or from an RS-232 serial port. GPIB and RS-232 programming uses SCPI commands (Standard Commands for Programmable Instruments) that make the ac source programs compatible with those of other instruments.
1 - General Information 16 Peak Current/Dynamic Power Capability The ac source can generate peak currents that exceed the rms current capability of the unit. This not only applies when operating in ac mode, but also when programming output pulses in dc mode.
General Information - 1 17 ♦ as voltage increases, the I peak setting needs to be decreased. ♦ as frequency increases, the I peak setting can be increased.
1 - General Information 18 RMS Current Limit Circuit The output rms current limit is adjustable to any value within the range of the unit. If the load attempts to draw more current than the programmed limit, the output voltage is reduced to keep the rms current within the limit.
General Information - 1 19 CAUTION: Programming the ac source output impedance into a load with a low impedance can cause output voltage instability, which may damage the ac source. Stability MUST be maintained when operating the ac source with programmable resistance or inductance.
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21 2 Installation Inspection Damage When you receive your ac source, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and the nearest Agilent Sales and Support Office immediately.
2 - Installation 22 Location Refer to the Safety Summary page at the beginning of this manual for safety-related information about environmental conditions. CAUTION: Agilent 6811B/6812B units weigh 28.2 kg (62 lbs). Agilent 6813B units weigh 32.7 kg (72 lbs).
Installation - 2 23 Input Connections Input Source and Line Fuse You can operate your ac source from a single-phase ac power source as indicated on the rear panel Line Rating label. See "ac Input Voltage Range" in Table A-2 of Appendix A for details.
2 - Installation 24 Figure 2-3. Connecting the Power Cord Output Connections The power output terminal block has a floating output terminal connection and a floating neutral line for the return connection. A separate earth ground terminal is located on the extreme right of the terminal block.
Installation - 2 25 Wire Considerations NOTE: To minimize the possibility of instability on the output, keep load leads as short as possible bundle or twist the leads tightly together to minimize indu.
2 - Installation 26 ♦ Connect the phase 1 (1) sense terminals to the side of the load that connects to the corresponding output terminal. ♦ Connect the Neutral (COM) sense terminal connector to the neutral side of the load. ♦ Twist and shield all signal wires to and from the sense connectors.
Installation - 2 27 Remote Sensing and OVP Considerations In remote sense applications, the voltage drop in the load leads subtracts from the available load voltage (see "Remote Sensing Capability" in appendix A).
2 - Installation 28 In example B, the FLT output of one unit is connected to the INH input of another unit. A fault condition in one of the units will disable all of them without intervention either by the controller or external circuitry.
Installation - 2 29 RS-232 Interface The ac source provides an RS-232 programming interface, which is activated by commands located under the front panel Address key.
2 - Installation 30 Hardware Handshake The RS-232 interface uses the DTR (data terminal ready) line as a holdoff signal to the bus controller. When DTR is true, the bus controller may send data to the ac source.
31 3 Turn-On Checkout Introduction Successful tests in this chapter provide a high degree of confidence that the ac source is operating properly. For verification tests, see appendix B. Complete performance tests are given in the Service Guide. NOTE: This chapter provides a preliminary introduction to the ac source front panel.
3 - Turn-On Checkout 32 Using the Keypad (shift) Some of the front panel keys perform two functions, one labeled in black and the other in blue. You access the blue function by first pressing the blue shift key. Release the key after you press it. The Shift annunciator will be on, indicating that you have access to any key’s shifted function.
Turn-On Checkout - 3 33 Figure 3-1.Verification Connections Procedure Display Explanation 1. Turn the unit on. Meter mode Meter mode is active and the Dis annunciator should be on. 2. Press the Voltage key. VOLT 0.00 Display indicates the default settings.
3 - Turn-On Checkout 34 Procedure Display Explanation 10. Press Shift , and Current CURR:LEV 5 Indicates the default output current limit setting. 11. Press .
Turn-On Checkout - 3 35 Runtime Error Messages Under unusual operating conditions, the front panel display may show OVLD. This indicates that the output voltage or current is beyond the range of the meter readback circuit. If the front panel display indicates -- -- -- -- -- -- , a GPIB measurement is in progress.
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37 4 Front panel Operation Introduction Here is what you will find in this chapter: ♦ a complete description of the front pan el controls ♦ front panel programming examples that describe: how to p.
4 - Front Panel Operation 38 j Display 14-character vacuum fluorescent display for showing programmed commands and measured values. k Annunciators Annunciators light to indicate operating modes and status conditions: φ 1 Phase 1 is being controlled or metered.
Front Panel Operation - 4 39 System Keys Refer to the examples later in this chapter for more details on the use of these keys. SY STE M Reca ll Sav e Error Addre ss Local Figure 4-2. System Keys This is the blue, unlabeled key, which is also shown as in this guide.
4 - Front Panel Operation 40 Function Keys Refer to the examples later in this chapter for more details on the use of these keys. FUNCTI ON Meter Inpu t Protec t Trigger Output Stat us Har moni c Trigge r Control Current Voltage Freq Phas e Shape Pulse List Inde x Index Output on/off Phase Select Figure 4-3.
Front Panel Operation - 4 41 Meter Display Keys Metering keys control the metering functions of the ac source. Press this key to access the meter menu list.
4 - Front Panel Operation 42 Output Control Keys Output control keys control the output functions of the ac source. Press this key to access the voltage menu list.
Front Panel Operation - 4 43 Press this key to access the phase menu list. Display Command Function PHASE <value> Set immediate output phase PHASE:T <value> Set triggered output phase PHASE:M <char> Select the phase mode (FIXED, STEP, PULSE or LIST) Press this key to access the shape menu list.
4 - Front Panel Operation 44 Protection and Status Control Keys The Protect and Status keys control the protection functions and status registers of the ac source. Refer to Chapter 4 of the Programming guide for more information on the status registers.
Front Panel Operation - 4 45 Trigger and List Control Keys The Trigger Control key controls output transient triggers. The List key controls the generation of output lists. A list can contain up to 100 points, each of which can specify an output change (or transient).
4 - Front Panel Operation 46 Entry Keys Refer to the examples later in this chapter for more details on the use of these keys. - 3 2 1 0 . 789 4 56 ENTRY E Calibration Ente r Clear Entry Figure 4-4. Entry Keys These keys let you scroll through choices in a parameter list that apply to a specific command.
Front Panel Operation - 4 47 Examples of Front Panel Programming You will find these examples on the following pages: 1 Setting the output voltage amplitude 2 Setting the output frequency 3 Setting th.
4 - Front Panel Operation 48 2 - Setting the Output Frequency When you turn on the ac source, the default output frequency is a 60 Hz. Assuming the voltage output from example 1 is in effect (120 Vrms sinewave), change the frequency to 50 Hz as follows: Action Display You can set the frequency in the same way that you set the voltage: 1.
Front Panel Operation - 4 49 4 - Setting a Protection Feature You can set the ac source to disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output.
4 - Front Panel Operation 50 Condition Action OV Condition Usually overvoltage conditions are caused by an external source forcing voltage into the output of the ac source. Remove this external source to eliminate the overvoltage. You can also program the overvoltage level to a higher value, or turn the overvoltage protection off.
Front Panel Operation - 4 51 Step Transient The Voltage Menu lets you specify an alternate or triggered voltage level that the ac source will apply to the output when it receives a trigger.
4 - Front Panel Operation 52 Action Display 1. Press Voltage to access the Voltage Menu. On the Entry keypad, press 1 0 2 Enter . VOLT 102 2. Press ô to access the triggered voltage command. On the Entry keypad, press 1 2 0 Enter . VOLT 120 3. Access the Voltage Menu again and press ô to access the voltage mode command.
Front Panel Operation - 4 53 Action Display 1. Press Voltage to access the Voltage Menu. Then press ô to access the voltage mode command. VOLT:M FIXED 2. On the Entry keypad, press ¯ or ° to scroll through the mode parameters to obtain LIST and press Enter .
4 - Front Panel Operation 54 Note that phase synchronization is referenced to an internal phase signal. The output of the unit is normally offset by 0 ° with respect to this internal reference.
Front Panel Operation - 4 55 8 - Using Slew Rates to Generate Waveforms As shown in the previous examples there are a number of ways that you can generate custom waveforms. Programmable slew rates provide additional flexibility when customizing waveforms.
4 - Front Panel Operation 56 Example Display j This example uses the immediate slew rate. First, access the Voltage menu and press ô until you access the mode command. On the Entry keypad, press ° to obtain FIXED. Press Enter . Access the voltage menu and press ô until you access the slew command.
Front Panel Operation - 4 57 9 - Measuring Peak Inrush Current Peak inrush current is a non-repetitive measurement in the sense that peak inrush current occurs only when the unit under test is first turned on. In order to repeat the measurement, you must turn the unit off and wait for any input filter capacitors to discharge completely.
4 - Front Panel Operation 58 10 - Setting the GPIB Address and RS-232 Parameters Your ac source is shipped with the GPIB address set to 5 This address can only be changed from the front panel using the Address menu located under the Address key.
59 A Specifications Specifications Table A-1 lists the specifications of the ac source. Performance specifications are warranted over the ambient temperature range of 0 to 40 o C.
A - Specifications 60 Table A-1. Performance Specifications (continued) Parameter Agilent 6811B/6812B/6813B Measurement Accuracy (continued) rms Current High Range (45 − 100 Hz) : (>100 − 500 Hz) : (>500 Hz − 1 kHz) : 0.05% + 10 mA 0.05% + 15 mA 0.
Specifications - A 61 Supplemental Characteristics Table A-2 lists the supplemental characteristics, which are not warranted but are descriptions of typical performance determined either by design or type testing.
A - Specifications 62 Table A-2. Supplemental Characteristics (continued) Parameter Agilent 6811B Agilent 6812B Agilent 6813B Transient System Phase Synchronization: ± 100 µ s Pulse Width Range: 200 µ s to 4.3 x 10 5 seconds Pulse/Dwell Timing Accuracy: ± 0.
Specifications - A 63 Operation Below 45 Hz The following operating characteristics apply for output frequencies between 45Hz and 1Hz. Below 1 Hz, instantaneous values meet the dc specifications. The ac source output is set to: sinewave, dc coupled, real-time regulation, and is connected to a linear load.
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65 B Verification and Calibration Introduction This appendix includes verification and calibration procedures for the Agilent 6811B/6812B/6813B AC Power Solutions. Instructions are given for performing the procedures either from the front panel or from a controller over the GPIB.
B - Verification and Calibration 66 Table B-1. Equipment Required Equipment Characteristics Recommended Model Digital Voltmeter Resolution: 10 nV @ 1 V Readout: 8.5 digits Accuracy: >20 ppm Agilent 3458A Current Monitor 1 0.01 Ω , ± 200 ppm, 10 Watts Guildline 7320/0.
Verification and Calibration - B 67 Performing the Verification Tests The following procedures assume you understand how to operate the ac source from the front panel as explained in Chapter 4.
B - Verification and Calibration 68 DC Voltage Programming and Measurement Accuracy CAUTION: Disconnect the ratio transformer for this test. This test verifies the dc voltage programming, GPIB readback, and front panel meter functions. Values read back over the GPIB should be the same as those displayed on the front panel.
Verification and Calibration - B 69 Table B-2. Agilent 6811B Verification Test Record Model Agilent 6811B Report No.____________ Date_____________ Test Description Minimum Specification Recorded Resul.
B - Verification and Calibration 70 Table B-3 (continued) DC Programming and Measurement Accuracy 425 Vdc accuracy Front Panel Measurement − 425 Vdc accuracy Front Panel Measurement 424.075 V Vdc − 0.277 V − 424.075 V Vdc − 0.277 V _______V _______V _______V _______V 425.
Verification and Calibration - B 71 Performing the Calibration Procedure Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup. NOTE: You do not have to do a complete calibration each time. You may calibrate only the voltage or current and proceed to "Saving the Calibration Constants.
B - Verification and Calibration 72 Front Panel Calibration WARNING: LETHAL VOLTAGES . Ac sources can supply 424 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.
Verification and Calibration - B 73 11. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry keypad to enter the dc voltage value displayed on the DVM. CAL:DATA 0.00 12. Press Shift Calibration , scroll to the CAL LEV P1 command, use ° to scroll to the P4 parameter, and press Enter .
B - Verification and Calibration 74 26. Press Shift Calibration, scroll to the CAL LEV P1 command, use ° to scroll to the P2 parameter, and press Enter . This selects the second calibration point. CAL:LEV P2 27. Press Shift Calibration, scroll to CAL DATA 0.
Verification and Calibration - B 75 Calibrating and Entering rms Current Measurement Values Action Display 40. Connect the DVM (ac rms mode), current shunt, and load resistor as shown in figure B-1 with S1 closed. 41. Press Shift Calibration, scroll to the CAL CURR MEAS command, and press Enter .
B - Verification and Calibration 76 Changing the Calibration Password The factory default password is 0. You can change the password when the ac source is in calibration mode (which requires you to enter the existing password). Proceed as follows: Action Display 1.
Verification and Calibration - B 77 Figure B-2. Calibration Program Listing (Sheet 1 of 3) 10 ! 20 ! AC Source calibration program Rev B.00.00 30 ! 40 ASSIGN @Ac TO 705 50 ! 60 PRINT TABXY(5,5),"This program will calibrate the 6811B/12B/13B AC Power Solutions.
B - Verification and Calibration 78 Figure B-2. Calibration Program Listing (Sheet 2 of 3) 560 OUTPUT @Ac;"CAL:LEV P1" 570 WAIT 10 580 INPUT "Enter DC voltage reading from DVM",Dc_.
Verification and Calibration - B 79 Figure B-2. Calibration Program Listing (Sheet 3 of 3) 1110 PRINT TABXY(15,9),"3. Connect the 3458A across the current shunt" 1120 PRINT TABXY(15,11),"4. Set the 3458A to AC rms VOLTS" 1130 PRINT TABXY(15,13),"5.
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81 C Error Messages Error Number List This appendix gives the error numbers and descriptions that are returned by the ac source. Error numbers are returned in two ways: ♦ Error numbers are displayed on the front panel ♦ Error numbers and messages are read back with the SYSTem:ERRor? query.
C - Error Messages 82 –161 Invalid block data [e.g., END received before length satisfied] –168 Block data not allowed –170 Expression error –171 Invalid expression –178 Expression data not .
Error Messages - C 83 40 Voltage selftest error, output 1 41 Voltage selftest error, output 2 42 Voltage selftest error, output 3 43 Current selftest error, output 1 44 Current selftest error, output .
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85 D Line Voltage Conversion WARNING: Shock Hazard Hazardous voltage can remain inside the unit even after it has been turned off. This procedure should only be done by qualified electronics service personnel. Open the Unit ♦ Turn off the ac power to the unit and disconnect the power cord from the power outlet.
D - Line Voltage Conversion 86 ♦ You need only to lift the board out of the way, you do not need to disconnect any cables. ♦ Locate the connector in front of the power transformer. ♦ For 100 V, 200 V, or 208 V operation, install the plug on the connector labeled: 200 V input.
87 Index —A— ac line conversion, 85 accessories, 12 airflow, 22 annunciators φ 1, 38 Addr, 38 Cal, 38 CC, 38 CV, 38 Dis, 38 Err, 38 OCP, 38 Prot, 38 Rmt, 38 Shift, 38 SRQ, 38 Tran, 38 Unr, 38 AWG.
Index 88 —L— lethal voltages, 65 line fuse replacing, 35 line voltage conversion, 85 List, 50, 52 load regulation, 18 load voltage drops, 25 location, 22 low frequency operation (<45 Hz), 15, 6.
Index 89 interface cable, 30 pinouts, 29 —S— safety class, 12 safety summary, 3 safety warning, 12 saving operating states, 58 self-test, 31 selftest errors, 34 sense connections, 25 service guide.
90 Agilent Sales and Support Offices For more information about Agilent Technologies test and measurement products, applications, services, and for a current sales office listing, visit our web site: http://www.agilent.com/find/tmdir You can also contact one of the following centers and ask for a test and measurement sales representative.
Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 4/15/00 All references to HP have been changed to Agilent.
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