Agilent N3280A - Manuals

6 Acoustic Noise Information Herstellerbescheinigung Diese Information steht im Zusammenhang mit den Anforderungen derMaschinenl ä minformationsverordnung vom 18 Januar 1991. * Schalldruckpegel Lp <70 dB(A)* Am Arbeitsplatz* Normaler Betrieb* Nach EN 27779 (Typpr ü fung). Manufacturer's Declarati...

7 Table of Contents Warranty Information 2 Safety Summary 3 Declaration Page 5 Acoustic Noise Information 6 Printing History 6 Table of Contents 7 GENERAL INFORMATION 13 Document Orientation 13 Safety Considerations 13 Options and Accessories 14 Description 14 Remote Programming 14 Output Characteri...

9 Pre-trigger and Post-trigger Data Acquisition 48 Programming the Status Registers 49 Operation Status Group 50 Questionable Status Group 51 Standard Event Status Group 51 Status Byte Register 51 Determining the Cause of a Service Interrupt 52 Servicing Operation Status and Questionable Status Even...

13 1 General Information Document Orientation This manual describes the operation of the Agilent Model N3280A Component Test DC Source. Unlessotherwise noted, the unit will be referred to by the description "dc source" throughout this manual. The following Getting Started Map is a general gu...

1 - General Information 14 Options and Accessories Table 1-1. Options Option Description 100 87 − 106 Vac, 47 − 63 Hz 220 191 − 233 Vac, 47 − 63 Hz 230 207 − 253 Vac, 47 − 63 Hz 8ZL Add instrument feet - for bench mounting (p/n 5041-9167) AXS 1 Rack mount kit for two side-by-side N3280A units. Consi...

General Information - 1 15 Output Characteristics Voltage Priority Operation Each Agilent N3280A output is a four-quadrant bipolar dc source that can be operated in either voltageor current priority mode. In voltage priority mode the output is controlled by a bi-polar constant voltagefeedback loop, ...

1 - General Information 16 If the output voltage exceeds either the positive or negative overvoltage set point, the output will shutdown and be disabled, automatically opening the output and sense relays. This leaves the output in ahigh-impedance state. The full ± 512.5 milliampere output current is...

General Information - 1 17 The heavy line illustrates the locus of possible operating points as a function of the output load, whichmay be purely resistive, or possibly include external voltage or current sources. In current priority mode,the constant current loop will regulate the output current as...

1 - General Information 18 measurement ranges to make fast measurements. The Hanning window can be used to reduce errorscaused by other periodic noise sources, provided that the sample period is long enough to capture three ormore noise waveform cycles. Using a Hanning window will result in slower m...

19 2 Installation Inspection Damage When you receive your dc source, inspect it for any obvious damage that may have occurred duringshipment. If there is damage, notify the shipping carrier and the nearest Agilent Sales and Support Officeimmediately. The list of Agilent Sales and Support Offices is ...

2 - Installation 20 Location Figure 2-1 gives the dimensions of your dc source. The dc source must be installed in a location thatallows enough space at the sides and back of the unit for adequate air circulation (see Bench Operation). NOTE: This dc source generates magnetic fields that may affect t...

Installation - 2 21 Power Connections Connect the Power Cord Connect the power cord to the IEC 320 connector on the rear of the unit. If the wrong power cord wasshipped with your unit, contact your nearest Agilent Sales and Support Office to obtain the correct cord(refer to the list at the back of t...

2 - Installation 22 Output Connections Turn the unit off before connecting any wires. Outputs 1 - 4 Disconnect the mating plug from the unit by pulling it straight back. The output connectors (outputs 1-4) have a termination for the Hi and Lo output terminals, the Hi and Losense terminals, a guard t...

Installation - 2 23 + _ TWIST LEADS KEEP RESISTNCE ANDINDUCTANCE LOW.USE TWISTED PAIR ORSANDWICHED PCB TRACKS. TWIST PAIR FIXTURE CONNECTIONS LOA D ADDITION OF LOW-LEAKAGE RC NETWORK MAY IMPROVE TRANSIENT RESPONSE IN VOLTAGE PRIORITY MODE. OUTPUT 1MATING PLUGSHOWN Hsen Hi Lo Lsen INSERT WIRES TIGHTE...

2 - Installation 24 NOTE: Any voltage drop in the load leads must be subtracted from the full-scale voltageavailable at the output terminals. Coaxial Guard Connections An active guard connection is available at the output connector. When the guard connection is extendedto a test fixture for example,...

Installation - 2 25 Maintaining Stability In voltage priority mode, the constant voltage loop has the following three compensation bandwidths: ♦ 30 kHz, 20 kHz; and 10 kHz In current limit operation, only two compensation bandwidths are available: ♦ 30 kHz and 10 kHz If the output of your unit is be...

2 - Installation 26 GPIB Address Each dc source has its own GPIB bus address, which can be set using the rear panel Address switch. The dc source is shipped with its GPIB address set to 5. Refer to the following table for additional addressswitch positions. 4 3 2 1 0 0 1 Handle Address = 5 Table 2-3...

27 3 Turn-On Checkout Front Panel Description 1 2 3 N3280A 10V, 0.5A Component Test DC Source Figure 3-1. Front Panel, Overall View Q Q Q Q Line Switch AC mains power switch. R R R R Unit Indicators Unit indicators light to indicate the following operating conditions: Power The dc source is turned o...

3 – Turn-On Checkout 28 Checkout Procedure Successful tests in this chapter provide a high degree of confidence that your unit is operating properly.Complete performance tests are given in Appendix B. NOTE: To perform the checkout procedure, you will need a computer with a GPIB interface.You will al...

Turn-On Checkout - 3 29 In Case of Trouble Dc source failure may occur during power-on selftest or during operation. Either the Error or the Protindicator on the front panel may be lit to indicate that a failure has occurred. If this occurs, turn thepower off and then back on to see if the error per...

31 4 Introduction to Programming External References GPIB References The most important GPIB documents are your controller programming manuals - BASIC, GPIBCommand Library for MS DOS, etc. Refer to these for all non-SCPI commands (for example: LocalLockout). The following are two formal documents co...

4 - Introduction to Programming 32 Introduction to SCPI SCPI (Standard Commands for Programmable Instruments) is a programming language for controllinginstrument functions over the GPIB. SCPI is layered on top of the hardware-portion of IEEE 488.2. Thesame SCPI commands and parameters control the sa...

Introduction to Programming - 4 33 Multiple Commands in a Message Multiple SCPI commands can be combined and sent as a single message with one message terminator.There are two important considerations when sending several commands within a single message: ♦ Use a semicolon to separate commands withi...

4 - Introduction to Programming 34 Types of SCPI Messages There are two types of SCPI messages, program and response. ♦ A program message consists of one or more properly formatted SCPI commands sent from the controller to the dc source. The message, which may be sent at any time, requests the dc so...

Introduction to Programming - 4 35 Headers Headers, also referred to as keywords, are instructions recognized by the dc source. Headers may beeither in the long form or the short form. In the long form, the header is completely spelled out, such asVOLTAGE, STATUS, and DELAY. In the short form, the h...

4 - Introduction to Programming 36 Suffixes and Multipliers Class Suffix Unit Unit with Multiplier Current A ampere MA (milliampere) Amplitude V volt MV (millivolt) Time S second MS (millisecond) Common Multipliers 1E3 K kilo 1E-3 M milli 1E-6 U micro Response Data Types Character strings returned b...

Introduction to Programming - 4 37 *OPC This sets the OPC status bit when all pending operations have completed. Since yourprogram can read this status bit on an interrupt basis, *OPC allows subsequentcommands to be executed. NOTE: The trigger subsystem must be in the Idle state for the status OPC b...

39 5 Programming the DC Source Introduction This chapter contains examples on how to program your dc source. Simple examples show you how toprogram: K output voltage and current functions K internal and external triggers K measurement functions K the status and protection functions NOTE: The example...

5 - Programming the DC Source 40 Overvoltage Protection The dc source will turn off its output and open the output relays if the output voltage exceeds +11.5V( ± 0.3V) or − 11.5V ( ± 0.3V) when measured at the output terminals. Overvoltage protection is only available when operating in voltage prior...

Programming the DC Source - 5 41 Oscillation Protection Oscillation protection is a built in function that shuts down the output in about 10 milliseconds if apersistent and severe oscillation condition is detected. Oscillation protection can be enabled or disabledusing the following command: OUTP:OS...

5 - Programming the DC Source 42 Setting the Voltage and Current Trigger Levels You can program a trigger level (or alternate value) that the output voltage, output current, or outputcurrent limit function will go to when a trigger is received. To use the output trigger function, you mustfirst speci...

Programming the DC Source - 5 43 Generating Output Triggers After you have specified the appropriate trigger source, you can generate triggers as follows: GPIB Triggers Send one of the following commands over the GPIB: TRIG:IMM (not affected by the trigger source setting) *TRG an IEEE-488 Group Exec...

5 - Programming the DC Source 44 Power Line Cycles After a power-on or *RST, the dc source automatically makes measurements based on a 0.00912 powerline cycles (for 60 Hz line). This results in a default measurement sample of 5 points separated by 30.4microsecond time intervals. The easiest way to i...

Programming the DC Source - 5 45 Current Ranges The dc source has three current measurement ranges. The command that controls the ranges is: SENS:CURR:RANG <value>, (@< channel list >) Enter the value of the current that you expect to measure. When the range is set to MAX, the maximumcur...

5 - Programming the DC Source 46 Measurement Trigger Model Figure 5-3 is a model of the measurement trigger system. The rectangular boxes represent states. Thearrows show the transitions between states. These are labeled with the input or event that causes thetransition to occur. DATA ACQUIRED INITI...

Programming the DC Source - 5 47 To select GPIB bus triggers, use: TRIG:ACQ:SOUR BUS To select external triggers use: TRIG:ACQ:SOUR EXT Selecting the Sensing Function Each output channel has its own measurement buffer. Since both voltage and current measurements aresupported, you must specify a meas...

5 - Programming the DC Source 48 When the acquisition finishes, any of the FETCh queries can be used to return the results. Once themeasurement trigger is initiated, if a FETCh query is sent before the data acquisition is triggered orbefore it is finished, the response data will be delayed until the...

Programming the DC Source - 5 49 Programming the Status Registers Status register programming lets you determine the operating condition of the dc source at any time. Forexample, you may program the dc source to generate an interrupt (SRQ) when an event such as a currentlimit occurs. When the interr...

5 - Programming the DC Source 50 Table 5-1. Bit Configurations of Status Registers Bit Signal Meaning 0 1 2 3 4 5 6 CV CL+ CL- CC VL+ VL- OFF Operation Status Group The selected output is in constant voltage mode (applies only in voltage priority mode) The selected output is in positive current limi...

Programming the DC Source - 5 51 Questionable Status Group The Questionable Status registers record signals that indicate abnormal operation. As shown below, thegroup consists of the same register types as the Status Operation group. The outputs of the QuestionableStatus group are logically-ORed int...

5 - Programming the DC Source 52 Determining the Cause of a Service Interrupt You can determine the reason for an SRQ by the following actions: Step 1 Determine which summary bits are active. Use:*STB? or serial poll Step 2 Read the corresponding Event register for each summary bit to determine whic...

53 6 Language Dictionary Introduction This section gives the syntax and parameters for all the IEEE 488.2 SCPI commands and the Commoncommands used by the dc source. It is assumed that you are familiar with the material in chapter 4, whichexplains the terms, symbols, and syntactical structures used ...

6 – Language Dictionary 54 SCPI Programming Commands - At a Glance Table 6-1. Subsystem Commands Syntax ABORt Resets the trigger system to the Idle state CALibrate :CURRent [:LEVEL] (@channel) Calibrate output current and low current measurement range :LIMit [:POSitive] (@channel) Calibrate positive...

Language Dictionary - 6 55 Table 6-1. Subsystem Commands Syntax (continued) [SOURce:] CURRent [:LEVel] [:IMMediate][:AMPLitude] <n>, (@list) Sets the output current (in current priority mode) :TRIGgered [:AMPLitude] <n>, (@list) Sets the triggered output current (in current priority mode...

Language Dictionary - 6 57 Calibration Commands Calibration commands let you enable and disable the calibration mode, change the calibration password,calibrate current and voltage programming, and store new calibration constants in nonvolatile memory.Only one output channel may be calibrated at a ti...

6 – Language Dictionary 60 Measurement Commands Measurement commands consist of fetch, measure, and sense commands. Measure commands measure the output voltage or current. Measurements are performed by digitizing the instantaneous output voltage or current for a specified number of samples, storing ...

6 – Language Dictionary 64 Output Commands Output commands consist of output and source commands. Output commands enable the output and oscillation functions. Source commands program the actual output voltage and current settings. OUTPut This command enables or disables the dc source output. The sta...

Language Dictionary - 6 69 Status Commands Status commands program the dc source status registers. The dc source has three groups of statusregisters; Operation, Questionable, and Standard Event. The Standard Event group is programmed withCommon commands as described later in this section. The Operat...

6 – Language Dictionary 72 System Commands System commands control system functions that are not directly related to output control or measurementfunctions. SYSTem:ERRor? This query returns the next error number followed by its corresponding error message string from theremote programming error queu...

Language Dictionary - 6 73 Trigger Commands Trigger commands consist of trigger and initiate commands. Initiate commands initialize the trigger system. Trigger commands control the remote triggering of the dc source. They are used to generate output and measurement triggers. NOTE: Before you generat...

6 – Language Dictionary 74 TRIGger:ACQuire:SOURce This command selects the trigger source for the measurement trigger system. EXT External trigger input signal BUS GPIB device, *TRG, or <GET> (Group Execute Trigger) Command Syntax TRIGger:ACQuire:SOURce <source> Parameters BUS | EXTernal...

Language Dictionary - 6 75 Common Commands *CLS This command causes the following actions (see chapter 5 for the descriptions of all registers): K Clears the Standard Event Status, Operation Status Event, and Questionable Status Event registers K Clears the Status Byte and the Error Queue K If *CLS ...

6 – Language Dictionary 76 *IDN? This query requests the dc source to identify itself. It returns a string composed of four fields separatedby commas. Query Syntax *IDN? Returned Parameters <AARD> Field Information Agilent Technologies Manufacturer xxxxxA model number followed by a letter suff...

6 – Language Dictionary 78 Table 6-8. Bit Configuration of Status Byte Register Bit Position 7 6 5 4 3 2 1 0 Bit Name OPER MSS (RQS) ESB MAV QUES WTG 0 0 Bit Value 128 64 32 16 8 4 2 1 OPER = Operation status summaryMSS = Master status summary(RQS) = Request for serviceESB = Event status byte summar...

79 A Specifications Introduction Table A-1 lists the specifications of the dc source. Unless otherwise noted, specifications are warrantedat 25 ° C ± 5 ° C after a 30-minute warm-up period. Sense terminals must be connected to their respective output terminals. Table A-1. Specifications Parameter Vo...

A - Specifications 80 Table A-2 lists the supplemental characteristics, which are not warranted but are descriptions of typicalperformance determined either by design or type testing. Table A-2 Supplemental Characteristics Parameter Voltage Priority Current Priority Output ProgrammingLimits Voltage:...

83 B Performance Tests and Calibration Introduction This appendix contains test procedures to verify that the dc source is operating normally and is withinpublished specifications. There are three types of tests as follows: Built-in Self Tests These tests run automatically when the dc source is turn...

B - Performance and Calibration Procedures 84 Table B-1. Equipment Required (continued) Oscilloscope Sensitivity: 1 mV/div.Bandwidth Limit: 20 to 30 MHzProbe: 1:1 with RF tip Agilent Infinium orequivalent RMS voltmeter True RMS Bandwidth: 20 Mhz min. Sensitivity: 100 µ V Rhode & SchwartzModel UR...

Performance and Calibration Procedures 85 Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power.For most tests, an electronic load is considerably easier to use than load resistors, but it may not be fastenough to test transient reco...

B - Performance and Calibration Procedures 86 Voltage Priority Tests Voltage Programming and Readback Accuracy These tests verify that the voltage programming and GPIB readback functions are within specifications. Action Program Commands 1. Reset the dc source and connect a DVM as shown in Figure B-...

B - Performance and Calibration Procedures 88 7. Turn on the output and program the 15mA current readback range. Measure the output current. “OUTP ON,(@1)”“SENS:CURR:RANG 0.015,(@1)”“MEAS:CURR? (@1)” 8. Set the ammeter to the 10mA range, and record the output currentreading on the ammeter. The diffe...

Performance and Calibration Procedures 89 Load Effect Tests The following tests verify the dc regulation of the output voltage and current. To insure that the valuesread are truly dc and not affected by output ripple, several dc measurements should be made and theaverage of these readings calculated...

B - Performance and Calibration Procedures 90 Voltage Priority, +Current Limit Load Effect This test measures the change in output current resulting from a change in output voltage from about zerovolts to about 10 volts. Action Program Commands 1. Turn off the dc source and connect the output as sho...

Performance and Calibration Procedures 91 Current Priority Constant Current Test This test measures the change in output current resulting from a change in output voltage from about zerovolts to the maximum output voltage. NOTE: The voltage limits in Current Priority Mode are not programmable. Actio...

B - Performance and Calibration Procedures 92 4. Read back the N3280A status to be sure that it's in the CV mode. This query should return a Bit value of “ 1 ” for CV mode. If it is not in CV mode, adjust the load or the output voltage slightlyuntil the unit goes into CV mode. “STAT:OPER:COND? (@1)”...

Performance and Calibration Procedures 93 3. Read back the N3280A status to be sure that it’s in the – CL mode. This query should return a Bit value of “ 4 ” for – CL mode. “STAT:OPER:COND? (@1)” 4. Adjust the transformer to the lowest rated line voltage(e.g., 104 Vac for a 120 Vac nominal line volt...

B - Performance and Calibration Procedures 94 Ripple and Noise Tests Voltage Priority Ripple and Noise Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residualac voltage superimposed on the dc output voltage. PARD is specified as the rms or peak-to-peak ou...

Performance and Calibration Procedures 95 Current Priority Ripple and Noise Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as wellas an ac voltage superimposed on the dc output. PARD is specified as the rms output current in afrequency range specified i...

B - Performance and Calibration Procedures 96 Figure B-2. Transient Waveform Voltage Priority Current Priority Transient Recovery Time This test measures the time for the output current to recover to within the specified value following a ± 1V change in the output voltage. The test setup uses a 0.47...

Performance and Calibration Procedures 97 Figure B-3. Transient Waveform Current Priority Performance Test Equipment Form Test Facility: _________________________ Report Number ________________________ ____________________________________ Date _________________________________ ______________________...

B - Performance and Calibration Procedures 98 Performance Test Record Form Model Agilent N3280A - Output 1 Report No ______________ Date __________________ Test Description Minimum Specification Results Maximum Specification VOLTAGE PRIORITY TESTS Programming Accuracy (DMM readings) Voltage ( 0V) Vo...

Performance and Calibration Procedures 99 Performing the Calibration Procedure You can only calibrate the dc source by using SCPI commands within your controller programmingstatements. The SCPI calibration commands are explained in chapter 8. Calibration error messages thatcan occur during GPIB cali...

B - Performance and Calibration Procedures 100 Negative Current Limit Calibration Action Program Commands 1. Jumper the High sense terminal to the High output terminal.Jumper the Low sense terminal to the Low output terminal.Connect the current input of the 3458A multimeter directly to output 1. 2. ...

Performance and Calibration Procedures 101 15mA Range Current Measurement Calibration Action Program Commands 1. Jumper the High sense terminal to the High output terminal.Jumper the Low sense terminal to the Low output terminal.Connect the current input of the 3458A multimeter directly tooutput 1. ...

B - Performance and Calibration Procedures 102 Changing the Calibration Password The factory default password is 0. You can change the password when the dc source is in calibrationmode (which requires you to enter the existing password). Proceed as follows: Action Program Commands 1. Reset the unit....

103 C Error Messages Error Number List This appendix gives the error numbers and descriptions that are returned by the dc source. Errors areindicated in two ways: ♦ The Error or Prot indicators are lit on the front panel. ♦ Error numbers and messages are read back with the SYSTem:ERRor? query. SYSTe...

C – Error Messages 104 Table C-1. Error Numbers (continued –131 Invalid suffix [unrecognized units, or units not appropriate] –138 Suffix not allowed –141 Invalid character data [bad character, or unrecognized] –144 Character data too long –148 Character data not allowed –150 String data error –151 ...

Error Messages - C 105 Table C-1. Error Numbers (continued Selftest Errors 0 through 99 (sets Standard Event Status Register bit #3) 0 No error 1 Output 1 non-volatile RAM CAL section checksum failed 2 Output 2 non-volatile RAM CAL section checksum failed 3 Output 3 non-volatile RAM CAL section chec...

107 D Line Voltage Selection To change the line voltage selection: 1. Remove the line cord. 2. Check if the line voltage displayed in the window must be changed. 3. Open the door using a small flat-bladed screwdriver. 4. Rotate the cylinder so that the correct line voltage appears in the location un...

109 E Earlier Version Output Connectors This appendix documents the earlier version output connectors used on Agilent N3280A units. Earlier style Agilent N3280A units used a different style output connector with ten (10) pins instead of the six used on the present connector. The additional pins were...

111 Index —A— AARD, 36ABORT, 73accessories, 14address switch, 21airflow, 20averaging measurements, 43AWG ratings, 23 —C— cables, 14calibration, 99 equipment, 83error messages, 102GPIB, 99password, 102saving, 101setup, 85 calibration commands, 57 CAL CURR, 57 LIM, 57 CAL CURR MEAS, 57CAL DATA, 58CAL ...

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Manual Updates The following updates have been made to this manual since its publication. 6/1/01 Chapter 2 has been updated with information about the new output connector. Chapters 5 and 6 have been updated with a new SCPI command: [SOURce]CURRent:LIMit:BWIDth Appendix A has been updated to include...