Agilent E4356A - Manuals

General Information 13 1 General Information Introduction The following Getting Started Map will help you find the information you need to complete the specific task that you wantto accomplish. Refer to the table of contents or index of each guide for a complete list of the information contained wit...

General Information 14 Options Table 1-2. List of Options Option Description Standard Input power 230 Vac, nominal 200 Input power 200 Vac, nominal 831 Power cord, 12 AWG, UL listed, CSA certified, without plug 832 Power cord, 4 mm 2 , harmonized, without plug 834 Power cord, 10 AWG, UL listed, CSA ...

General Information 15 Description The Agilent E4356A is a unipolar, GPIB programmable power supply, which is programmable locally from the front panelor remotely via a rear-panel analog control port. Operational features include: ■ Constant voltage (CV) or constant current (CC) output over the rate...

General Information 16 Output Characteristic The power supply can operate in either CV (constant voltage) or CC (constant current) over its output voltage and currentratings (see Figure 1-l). Although the power supply can operate in either mode, it is designed as a constant voltage source.This means...

Installation 17 2 Installation Inspection Damage When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If there isdamage, notify the shipping carrier and the nearest Agilent Sales and Support Office immediately. Warranty information isprinted i...

Installation 18 Location and Temperature Bench Operation The Table A-2 in Appendix A gives the dimensions of your power supply. The cabinet has plastic feet that are shaped toensure self-alignment when stacked with other Agilent System II cabinets. The feet may be removed for rack mounting.Your powe...

Installation 19 The power cord supplied with power supply may or may not include a power plug (see "Options" in Chapter l) at one end ofthe cord. Terminating connections and a ground lug are attached to the other end of the cord. See Figure 2 -2 and proceed asfollows: 1. If they are not alre...

Installation 20 VXI plug&play Power Products Instrument Drivers VXI plug&play Power Products instrument drivers for Microsoft Windows 95 and Windows NT are now available on theWeb at http://www.agilent.com/find/drivers. These instrument drivers provide a high-level programming interface to y...

Turn-On Checkout 21 3 Turn-On Checkout Introduction Note This chapter provides a preliminary introduction to the power supply front panel. See Chapter 5 - "Front Panel" for more details. Successful tests in this chapter provide a high degree of confidence that the power supply is operating p...

Turn-On Checkout 22 Using the Keypad Shifted Keys Some of the front panel keys perform two functions, one labeled in black and the other in blue. You access the blue functionby first pressing the blue key, which is not labeled. When the Shift annunciator is on, you will know you have access to the k...

Turn-On Checkout 23 Press OV 30 Program the OVP to 30 volts, which is less than the output voltage. Press 0.000 OVP voltage entered is less than the output voltage. This causes theOVP circuit to trip. The output drops to zero, CV turns off, and Protturns on. Press OV - - - - - Shows that the power s...

Turn-On Checkout 24 Press Dis annunciator turns on. Press You have disabled the overcurrent protection circuit. The OCPannunciator turns off. Press ( )** You have cleared the overcurrent protection circuit. The Protannunciator turns off. Press Dis turns off and CC turns on. The output current is res...

Turn-On Checkout 25 The line fuse is located inside the power supply. To change it, proceed as follows: l. Turn off the front panel power switch and unplug the line cord from the power source. 2. Remove the power supply dustcover as follows: a. Remove the four screws securing the carrying straps and...

Turn-On Checkout 26 Table 3-3. Power-On Selftest Errors Error No. Display Failed Test Error No. Display Failed Test El FP RAM Front Panel RAM E8 SEC RAM Secondary RAM E2 FP ROM Front Panel ROM checksum E9 SEC ROM Secondary ROM checksum E3 EECHKSUM EEPROM E10 SEC 5V Secondary 5 V ADCreading E4 PRI XR...

User Connections 27 4 User Connections Rear Panel Connections Make application load connections to the output terminals or bus bars, analog connector, and digital connector as shown onthe rear-panel drawing for your model power supply. Make controller connections (GPIB and serial link) as shown in F...

User Connections 28 Note It is good engineering practice to twist and shield all signal wires to and from the analog and digital connectors Digital Connector This connector, which is on the rear panel, is for connecting fault/inhibit, digital I/O, or relay link signals. The connectoraccepts wires si...

User Connections 29  Output Safety Cover ô Analog Connector í – Output Bus Bar ÷ – Local Sense Terminal û + Local Sense Terminal ø + Output Bus Bar ù Signal Common î Local Sense Jumpers ü Rear Knockouts ê Bottom Knockout Insert screwdriver blade in slot and pry out Bend along joint and break off WA...

User Connections 30 Local Voltage Sensing Your power supply was shipped set up for local sensing. This means that the unit will sense and regulate its output at theoutput terminals, not at the load. Since local sensing does not compensate for voltage drops across screw terminals, busbars, or load le...

User Connections 31 Note The signal ground binding post on the rear panel is a convenient place to ground the sense shield. OVP Considerations The OVP circuit senses the voltage near the output terminals and not at the sense terminals. Depending on the voltage dropbetween the output terminals and th...

User Connections 32  Load Connection ô Load í Analog Connector Connect for remote sensing (optional) Connect for local sensing (default) Figure 4-5. Single Load Connection (Remote Sensing Optional) Connecting One Power supply To Multiple Loads Figure 4-6 shows how to connect a single power supply t...

User Connections 33  Analog Connector ô Slave Unit í Master Unit ÷ Program only the master. Set slave output and OVP slightly higher than the master to ensure that slave stays in CC mode û Load ø Load Connection Only local sensing permitted Connect for optional remote sensing Figure 4-7. Auto-Paral...

User Connections 34  Load Connection ô Analog Connector í Load ÷ Program each unit for full load current and 1/2 the load voltage Connect for remote sensing (optional) WARNING FLOATING VOLTAGES MUST NOT EXCEED ± 240 VDC NO OUTPUT TERMINAL MAY BE MORE THAN 240 V FROM CHASSIS GROUND. Figure 4-8. Seri...

User Connections 35 Programming. Note from Figure 4-1 that you have three options for programming the current. You can use a voltagesource that is positive, negative, or floating with respect to Common P. Do not exceed ± 15 V with respect to Common P. Make certain that the common connection for your...

Front Panel Operation 37 5 Front Panel Operation Introduction This chapter shows you how to operate the front panel. It is assumed that you are familiar with the turn-on checkoutprocedure in Chapter 3. That chapter describes how to perform basic power supply functions from the control panel.operatio...

Front Panel Operation 39 Table 5-1. Front Panel Controls and Indicators (continued) í SYSTEM Keys When the power supply is under remote control, press to enable local operation. This control can bedefeated by a lock -out command over the GPIB Press to display the power supply’s GPIB address. You can...

40 Front Panel Operation Programming The Output Important These instructions show how to program a single power supply. There are special considerations when you have two or more supplies connected in series or in autoparallel. See "Chapter 4 - User Connectionsand Considerations". The power ...

Front Panel Operation 41 Setting the OVP Level. Assuming that you have programmed the power supply for 45 volts, you can set the OVP level to48 volts as follows: ■ Press . The display will change from meter mode to indicate 0V, followed by the present OVP value. ■ Press . ■ The display will return t...

42 Front Panel Operation Programming Overcurrent Protection When enabled, overcurrent protection removes the power supply output whenever it goes into CC operation. This preventsthe unit from indefinitely uniting the full programmed current to the load. Setting The OCP Protection. To activate overcu...

Front Panel Operation 43 Saving and Recalling Operating States You can save programming time by storing up to 5 operating states in nonvolatile memory. The front panel programmingparameters that are saved are: ■ Output voltage, Output current, *OVP voltage, ■ OCP state (on or off), Output state (ena...

44 Front Panel Operation 1. As a stand-alone unit (the only unit at the address). It has a primary address in the range of 0 to 30. For example: 5 or 7. 2. As the direct unit in a serial link. It is the only unit connected directly to the GPIB bus. The primary address is unique and can be from 0 to ...

Remote Programming 45 6 Remote Programming Prerequisites for Remote Programming This organization of this guide assumes that you know or can learn the following information: 1. How to program in your controller language (Agilent BASIC, QUICKBASIC, C, etc.).2. The basics of the GPIB (IEEE 488).3. How...

46 Remote Programming GPIB Capabilities of the Power supply All power supply functions except for setting the GPIB address are programmable over the IEEE 488 bus (also known asthe General Purpose Interface Bus or "GPIB"). The IEEE 488.1 capabilities of the power supply are listed in theSuppl...

48 Remote Programming The optional header SOURCE precedes the current, digital, and voltage subsystems. This effectively makes :CURRENT, :DIGITAL, and :VOLTAGE root-level commands. Moving Among Subsystems In order to combine commands from different subsystems, you need to be able to restore the acti...

Remote Programming 49 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 thepower supply. The message, which may be sent at any time, requests the power supply to ...

50 Remote Programming Headers. Headers (which are sometimes known as "keywords") are instructions recognized by the power supply interface.Headers may be either in the long form or the short form. Long Form The header is completely spelled out, such as VOLTAGE STATUS DELAY. Short Form The he...

Remote Programming 51 SCPI Data Formats All data programmed to or returned from the power supply is ASCII. The data may be numerical or character string. Numerical Data Table 6-1 and Table 6-2 summarize the numerical formats. Table 6-1. Numerical Data Formats Symbol Data Form Talking Formats <NR1...

52 Remote Programming SCPI Command Completion SCPI commands sent to the power supply are processed either sequentially or in parallel. Sequential commands finishexecution before a subsequent command begins. A parallel command can begin execution while a preexisting command isstill executing (overlap...

Remote Programming 53 Programming Voltage and Current The following statements program both voltage and current and return the actual output from the sense terminals: OUTP OFF Disable the output. VOLT 45;CURR 25 Program the voltage and current. VOLT?;CURR? Read back the programmed levels. OUTP ON En...

54 Remote Programming You can remotely save and recall operating states. See *SAV and *RCL in "Chapter 7 - Language Dictionary" for theparameters that are saved and recalled. Note When you turn the power supply on, it automatically retrieves the state stored in location 0. When a powersupply...

Remote Programming 55 Note The last query string can be handled without difficulty. However, should you request too many queries,the system may return a "Query DEADLOCKED” error (-430). In that case, break the long string intosmaller parts. Programming the Digital I/O Port Digital control ports ...

56 Remote Programming Press Display returns to meter mode If you try to enter a forbidden number, ADDR ERROR is displayed. The following examples show how to set addresses:To set stand-along primary address 6, press To set direct unit primary address 6, press To set linked secondary address 1, press...

Remote Programming 57 DOS Drivers Types of Drivers The Agilent 82335A and National Instruments GPIB are two popular DOS drivers. Each is briefly described here. See thesoftware documentation supplied with the driver for more details. Agilent 82335A Driver . For GW-BASIC programming, the GPIB library...

62 Remote Programming SCPI Confirmed Commands 1 This power supply conforms to Version 1990.0. ABOR OUTP:PROT:DEL TRIG[:STAR]:DEL CAL[:STAT) OUTP:PROT:DEL? TRIG[:STAR]:DEL? [SOUR]:CURR[:LEV][:IMM][:AMPL] STAT:OPER[:EVEN]? TRIG[:STAR]:SOUR [SOUR]:CURR[:LEV][:IMMI[:AMPL] ? STAT:OPER:COND? TRIG[:STAR]:S...

Language Dictionary 63 7 Language Dictionary Introduction This section gives the syntax and parameters for all the IEEE 488.2 SCPI commands and the Common commands used bythe power supply. It is assumed that you are familiar with the material in Chapter 6 - "Remote Programming". That chapter...

64 Language Dictionary Description Of Common Commands Figure 7-1 shows the common commands and queries. These commands are listed alphabetically in the dictionary. If acommand has a corresponding query that simply returns the data or status specified by the command, then both commandand query are in...

Language Dictionary 65 *ESE Meaning and Type Event Status Enable Device Status Description This command programs the Standard Event Status Enable register bits. The programming determines which events of theStandard Event Status Event register (see *ESR?) are allowed to set the ESB (Event Summary Bi...

66 Language Dictionary *IDN? Meaning and Type Identification Query System Interface Description This query requests the power supply to identify itself. It returns a string composed of four fields separated by commas. Query Syntax *IDN? Returned Parameters <AARD>Field Information Agilent Techn...

68 Language Dictionary Command Syntax *PSC <bool> Parameters 0 | 1 | OFF | ON Example *PSC 0 *PSC 1 Query Syntax *PSC? Returned Parameters <NR1> 0 | 1 Related Commands *ESE *SRE *PSC causes a write cycle to nonvolatile memory. If *PSC is programmed to 0, then the *ESE and*SRE commands al...

Language Dictionary 69 *RST Meaning and Type Reset Device State Description This command resets the power supply to a factory-defined state as defined below. *RST also forces an ABORt command. Command State CAL:STAT OFF OUTP[:STAT] OFF CURR[:LEV][:IMM] * OUTP:PROT:DEL * CURR[:LEV]:TRIG * OUTP:REL[:S...

70 Language Dictionary *SRE Meaning and Type Service Request Enable Device Interface Description This command sets the condition of the Service Request Enable Register. This register determines which bits from theStatus Byte Register (see *STB for its bit configuration) are allowed to set the Master...

72 Language Dictionary Description Of Subsystem Commands Figure 7-2 is a tree diagram of the subsystem commands. Commands followed by a question mark (?) take only the queryform. Except as noted in the syntax descriptions, all other commands take both the command and query form. Thecommands are list...

Language Dictionary 73 Current Subsystem This subsystem programs the output current of the power supply. CURRCURR:TRIG These commands set the immediate current level or the pending triggered current level of the power supply. The immediatelevel is the current programmed for the output terminals. The...

74 Language Dictionary Digital Subsystem This subsystem programs the control port on the back of the power supply when it is configured for Digital I/O operation. DIG:DATA This command sets and reads the power supply digital control port when that port is configured for Digital I/O operation.Configu...

Language Dictionary 75 DISP:MODE Switches the display between its normal metering mode and a mode in which it displays text sent by the user. The commanduses the character data <CRD> format. Command Syntax DISPlay[:WINDow]:MODE NORMalITEXT Parameters <CRD> NORMal | TEXT *RST Value NORM E...

76 Language Dictionary Initiate Subsystem This subsystem enables the trigger system. INITINIT:CONT When a trigger is enabled with this command, an event on a selected trigger source causes the specified trigging action tooccur. If the trigger subsystem is not enabled, all trigger commands are ignore...

Language Dictionary 77 Output Subsystem This subsystem controls the power supply’s voltage and current outputs and an optional output relay. OUTP This command enables or disables the power supply output. The state of a disabled output is a condition of zero outputvoltage and a model-dependent minimu...

78 Language Dictionary OUTP:REL This command is valid only if the power supply is configured for the optional relay connector. Programming ON closes therelay contacts; programming OFF opens them. The relay is controlled independently of the output state. If the powersupply is supplying power to a lo...

Language Dictionary 79 Status Operation Registers The bit configuration of all Status Operation registers is shown in the following table. See "Chapter 8 - Status Reporting"for more explanation of these registers. Bit Configuration of Operation Registers Bit Position 15-12 11 10 9 8 7 6 5 4 ...

80 Language Dictionary STAT:OPER:NTRSTAT:OPER:PTR These commands set or read the value of the Operation NTR (Negative-Transition) and PTR (Positive-Transition) registers.These registers serve as polarity filters between the Operation Enable and Operation Event registers to cause the followingactions...

82 Language Dictionary System Commands System commands query error messages and software versions, and program system language functions. SYST:ERR? This query returns the next error number followed by its corresponding error message string from the remote programmingerror queue. The queue is a FIFO ...

Language Dictionary 83 Trigger Subsystem This subsystem controls remote triggering of the power supply. TRIG When the trigger subsystem is enabled, TRIG generates a trigger signal. The trigger will then: 1. Initiate a pending level change as specified by CURR[:LEV]:TRIG or VOLT[:LEV]:TRIG. 2. Clear ...

84 Language Dictionary Command Syntax [SOURce]:VOLTage[:LEVel][:IMMediate][AMPLitude] <NRf+> [SOURce][:VOLTage[:LEVel]:TRIGgered[:AMPLitude] <NRf+> Parameters Table 7-1 Default Suffix V *RST Value Table 7-1 Examples VOLT 200 MA VOLTAGE:LEVEL 200 MAVOLTAGE:LEVEL:IMMEDIATE:AMPLITUDE 2.5VOL...

Language Dictionary 85 Command Summary This summary lists all power supply subsystem commands in alphabetical order, followed by all common commands inalphabetical order. See Table 7-1 for the command parameters accepted by the power supply. Command Summary Command Parameters Subsystem Commands MEAS...

86 Language Dictionary Command Summary Command Parameters Subsystem Commands ABOR (none) CAL (See Appendix A in the Operating Manual) [SOUR]:CURR[:LEV][:IMM][:AMPL] <NRf+>[suffix] [SOUR]:CURR[:LEV][:IMM][:AMPL]? (none) |MIN|MAX [SOUR]:CURR[:LEV]:TRIG[:AMPL] <NRf+>[suffix] [SOUR]:CURR[:LE...

Status Reporting 87 8 Status Reporting Power supply Status Structure Figure 8-1 shows the status register structure of the power supply. The Standard Event, Status Byte, and Service RequestEnable registers and the Output Queue perform standard GPIB functions as defined in the IEEE 488.2 Standard Dig...

Status Reporting 89 Questionable Status Group Register Functions The Questionable Status registers record signals that indicate abnormal operation of the power supply. As shown in Figure8-1, the group consists of the same type of registers as the Status Operation group. The outputs of the Questionab...

Status Reporting 90 Status Byte Register This register summarizes the information from all other status groups as defined in the "IEEE 488.2 Standard DigitalInterface for Programmable Instrumentation" standard. The bit configuration is shown in Table 8-1. The register can beread either by a ...

Status Reporting 91 Initial Conditions At Power On Status Registers When the power supply is turned on, a sequence of commands initializes the status registers. For the factory-default *RSTpower-on state, Table 8-4 shows the register states and corresponding power-on commands. Table 8-4. Default Pow...

Status Reporting 92 Servicing an Operation Status Mode Event This example assumes you want a service request generated whenever the power supply switches to the CC (constantcurrent) mode. From Figure 8-1, note that the required path is for a condition at bit 10 (CC) of the Operation Status registert...

Specifications 93 A Specifications Specifications are performance parameters warranted over the specified temperature range. Supplemental Characteristics are not warranted but are descriptions of performance determined either by design or typetesting. Table A-1. Performance Specifications for Agilen...

Specifications 94 Table A-2. Supplemental Characteristics for Agilent E4356A Parameter Value Output Programming Range Voltage: Current: Overvoltage Protection: 81.9 V 30.71 A 96 V Typical Programming Resolution Voltage: Current: Overvoltage Protection: 20 mV 7.5 mA 150 mV Accuracy( @ 25 °C ± 5 °C) O...

Specifications 95 Table A-2. Supplemental Characteristics (continued) Parameter Value Command Processing Time(Average time for output voltage to change after receipt of digital datawhen the unit is connected directly to the GPIB Bus): 20 ms Output Voltage Rise Time/Fall Time(time for output to chang...

Calibration 97 B Calibration Introduction The power supply may be calibrated either from the front panel or from a controller over the GPIB. The procedures givenhere apply to all models. Important These instructions do not include verification procedures. If you need to perform verification as aprer...

Calibration 98 Front Panel Calibration Eight shifted keys and the Entry keypad are used for calibration functions (see Chapter 5 for explanations of shifted keysand the Entry keypad). The following procedures assume you understand how to operate front panel keys. Entering the Calibration Values Foll...

Calibration 99 Table B-2. Typical Front Panel Calibration Procedure Action Display Response Enabling the Calibration Mode 1. Begin calibration by pressing . 2. Enter calibration password from Entry keypad. If password is correct the Cal annunciator will come on. If password is incorrect, an error oc...

Calibration 100 Recovering From Calibration Problems You can encounter serious calibration problems if you cannot determine a calibration password that has been changed or thepower supply is severely out of calibration. There are jumpers inside the power supply that permit the calibration passwordto...

Calibration 101 Calibration Language Dictionary The calibration commands are listed in alphabetical order. The format for each command follows that shown in Chapter 7.Calibration error messages that can occur during GPIB calibration are shown in Table B -3. CAL:CURR This command is used to calibrate...

Calibration 102 CAL:STAT This command enables and disables the calibration mode. The calibration mode must be enabled before the power supplywill accept any other calibration commands. The first parameter specifies the enabled or disabled state. The secondparameter is the password. It is required if...

Calibration 103 BASIC Calibration Program The following program can be run on any controller operating under Agilent BASIC. The assumed power supply address is5 and calibration password is 4356. If required, change these parameters in the appropriate statements. 10 ! Agilent BASIC Calibration Progra...

Verification 105 C Verification Introduction This appendix provides operation verification test procedures. The tests do not check all the operating parameters, butverify that the power supply is performing properly. The required test equipment and acceptable test results are specified intables at t...

106 Verification Performing The Tests General Measurement Techniques Figure C-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to carry the output current (seeTable 8-1). To avoid noise pickup, use coaxial cable or shielded pairs for the test leads. Programming ...

Verification 107 Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification. Connect the appropriate currentmonitoring resistor (see Table C-1) as shown in Figure C-1(2). The accuracy of the resistor must be as specified in the tab...

Error Messages 109 D Error Messages Power supply Hardware Error Messages Front panel error messages resulting from selftest errors or runtime failures are described in “Chapter 3 - Turn-OnCheckout”. Calibration Error Messages Front panel error messages resulting from calibration errors are described...

Line Voltage Conversion 111 E Line Voltage Conversion SHOCK HAZARD. Hazardous voltage can remain inside the power supply even after it has beenturned off. This procedure should only be done by qualified electronics service personnel. Line voltage conversion is accomplished by setting a line voltage ...

Digital Port Functions 113 F Digital Port Functions Digital Connector A 4-pin connector and a quick-disconnect mating plug are provided for digital input and output signals (see Figure F-l forwiring connections, and Table A-2 for electrical characteristics). This digital port can be configured to pr...

114 Digital Port Functions GPIB Figure F-2. Example of Inhibit Input In Figure F-3A, the FLT output is connected to a relay driver circuit that energizes a relay whenever a fault condition occursin the power supply. The relay can be used to physically disconnect the output of the power supply from t...

Digital Port Functions 115 Changing The Port Configuration As shipped from the factory, the digital port is configured for FLT/INH operation. You can change the configuration of theport to operate as a general -purpose digital input/output port to control your custom circuitry as shown in Figure F-4...

116 Digital Port Functions Digital I/O Operation The digital port can be configured (see Figure F-4) to provide a digital input/output to be used with custom digital interfacecircuits or relay circuits. Some examples are shown Figure F-5. See Figure F-1 for the pin assignments of the mating plugand ...

Digital Port Functions 117 Figure F-6 shows how to connect your power supply to an Agilent 59510A or 59511A Relay Accessory when the digitalport is configured for relay link operation. An error will be generated if you attempt to program the relay box without firstconfiguring the digital port for re...

Compatibility Language 119 G Compatibility Language Introduction This power supply is programatically compatible with the Agilent 603xA Series AutoRanging Power Supplies (ARPS).This means that you can program this power supply over the GPIB using the ARPS commands. Software that you havewritten for ...

Compatibility Language 121 Table G-1. ARPS Commands (continued) ARPS Command 1 Description Similar SCPI Command RST This command resets the power supply if the output is disabled bythe overvoltage, remote inhibit, or foldback protection circuits.The power supply resets to the parameters stored for t...

122 Compatibility Language Table G-1. ARPS Commands (continued) ARPS Command 1 Description Similar SCPI Command UNMASK? This command reads which bits in the status register have beenenabled as fault conditions. The decimal equivalent of the total bitweight of all enabled bits is returned. STAT:OPER:...

Index 123 Index —<— <bool>, 51<NR1>, 51<NR2>, 51<NR3>, 51<NRf+>, 51<NRf>, 51 —A— AARD, 51accessories, 14active header path, 47 airflow, 18analog connector, 17 analog connector, 27annunciators Addr, 38AMPS, 38Cal, 38CC, 38CV, 38Dis, 38Err, 38OCP, 38Prot, 38Rmt, ...

Agilent Sales and Support Offices For more information, call your local Agilent sales office listed in your telephone directory or an Agilent regional officelisted below for location of your nearest sales/support office. United States of America: Europe: Agilent Technologies Company Agilent Technolo...

Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 3/01/00 All references to HP have been changed to Agilent.All references to HP-IB have been changed to GPIB.