Agilent 6628A - Manual

7 Table Of Contents 1 General Information Introduction............................ ....................................................................................................................... 11Safety Considerations................... .........................................................

General Information 11 1 General Information Introduction This chapter contains a general description of your power supply as well as its performance specifications. Informationabout options, accessories, and GP-IB cables is also provided. This manual describes the Agilent 6625A, 6626A, 6628A,and Ag...

General Information 14 Basic Operation Figure 1-2 is a block diagram that illustrates the major assemblies contained within the power supply. As shown in thefigure, each supply includes a power transformer, two or more output boards, a GP-IB board, and front panel (display andcontrol keys). Figure 1...

General Information 15 Output Boards The output boards are linear dc power supplies. Each isolated output operating boundary curve is shown in Figure 1-1. The ac input to each output board is rectified and applied to a regulator circuit. Each output board employs series regulationtechniques. A regul...

General Information 20 Table 1-3. Supplemental Characteristics (continued) Weight: Agilent 6625A, 6628A Agilent 6626A, 6629A Net 15.5 kg (34 lbs.) 17.7 kg (39 lbs.) Shipping 20.8 kg (46 lbs.) 23 kg (51 lbs.) Load Cross Regulation: Voltage 0.25 mV 0.25 mV 0.25 mV 0.25 mV + Current 0.005 mA 0.005 mA 0...

Installation 25 2 Installation Introduction This chapter contains instructions for checking and mounting your power supply, connecting your supply to ac power,converting it from one line voltage to another, and connecting the GP-IB cable. The power supply generates operating magnetic fields which ma...

Installation 26 Figure 2-1. Outline Diagram Input Power Requirements You can operate this power supply from a nominal 100 V, 120 V, 220 V or 240 V single phase power source at 47 to 66Hz. The input voltage range, maximum input current, high line inrush current (PK), and the fuse required for each of...

Installation 28 Power Cord The power supply is shipped from the factory with a power cord that has a plug appropriate for your location. Figure 2-4shows the standard configuration of plugs used by Agilent Technologies. Below each drawing is the Agilent part numberfor the replacement power cord equip...

Installation 29 FIRE HAZARD. Make sure the replacement fuse is one of the same type (size) and rating (amps) thatis consistent with the voltage level you are operating at. Do not use a substitute fuse; use a fuse withthe same Agilent Part number listed in Table 2-2. 6. Close the door of the line mod...

Getting Started 31 3 Getting Started Introduction This chapter is intended for the first time user of the supply. It provides four main discussions: • Front Panel Controls and Indicators • Turning on Your Supply • Checking Out Your Supply Using Local Control • Introduction to Remote Operation First,...

Getting Started 34 Table 3-1. Controls and Indicators (continued) Number Controls/Indicators Description Page 7 Output Control Keys(These twelve keys areoutput dependent). OUTPUT SELECT - Selects one of the outputchannels for local control or display. This key allows thechannels to be selected in fo...

Getting Started 35 Table 3-1. Controls and Indicators (continued) Number Controls/Indicators Description Page 7 (cont) Ñ CURRENT - Increases the selected output current by an LSB and then at a faster rate as the key is keptpressed, or after the RANGE V/I key has been pressed,sets the selected output...

Getting Started 36 Turning On Your Supply The following paragraphs describe the power-on sequence which includes a self test of most of the power supply’s circuits. Before you turn on your supply, make sure that: • The line module on the rear panel is set to match your input line voltage. • The prop...

Getting Started 37 Figure 3-4. Typical Display at Power-On Self-Test Errors If the supply fails the power-on self-test, all power supply outputs will remain disabled (off) and the display will indicatethe type of failure and the output channel on which it occurred. Figure 3-5 shows that self-test de...

Getting Started 39 6. Check that the display reads approximately 0 volts and the programmable current limit value. Also, check that the front panel CC annunciator is on indicating that the output is in the constant current mode of operation. 7. Set the current to 0.5 A by pressing: ISET . 5 ENTER 8....

Output Connections and Operating Information 45 4 Output Connections and Operating Information Introduction This chapter explains how to make connections to the output terminals located on the rear of your power supply. Somegeneral operating information is included in this chapter to help you unders...

Output Connections and Operating Information 48 The readback resolution of the 25 watt outputs when metering voltages of 7 volts or below, will be 483 µ V. For voltages above 7 volts, the readback resolution will be 3.3 mV. The readback resolution of the 25 watt outputs when metering source currents...

Output Connections and Operating Information 49 UNREGULATED OUTPUT -- the supply informs the user when output regulation is not guaranteed. This can occur when attempting to sink excessive currents below 4 volts on 25 W outputs and 2 volts on 50 W outputs or when operating outputsin parallel. The UN...

Output Connections and Operating Information 50 Note To prevent tripping of the overvoltage circuit, pick a wire size sufficient to handle the FULL outputcurrent of the unit no matter what the intended load current or current limit setting. Table 4-1 lists the resistivity for various wire sizes and ...

Output Connections and Operating Information 54 Open Sense Leads The sense leads are part of the supply’s feedback path. Connect them in such a way so that they do not inadvertentlybecome open circuited. The power supply includes protection resistors that reduce the effect of open sense leads during...

Output Connections and Operating Information 55 Figure 4-8. External Trigger Circuit Figure 4-9. Equivalent Internal OV Trigger Circuit Power Supply Protection Considerations Battery Charging If you are using your supply in a battery charging application, it is recommended that a series protection d...

Output Connections and Operating Information 56 Figure 4-10. Recommended Protection Circuit for Battery Charging Capacitive Load Limitation The programmable overvoltage protection circuit can be used to downprogram capacitive loads although it is primarilyintended for use as a protection feature as ...

Output Connections and Operating Information 59 Series Operation SHOCK HAZARD. Floating voltages must not exceed 240 Vdc. No output terminal may be morethan 240 Vdc from chassis ground. Connect in series only outputs that have equivalent current ratings. Each output has a reverse voltageprotection d...

Remote Operation 63 5 Remote Operation Introduction Chapter 3 introduced you to the basics of remote operation and provided a few simple examples using a Series 200/300computer as the GP-IB controller. This chapter contains all the information required to control your power supply remotelyand discus...

Remote Operation 65 Power-On Service Request (PON) The power supply can request service from the controller when the power is turned on. This request can be enabled ordisabled by sending a PON command (see page 80). When the request is enabled, the supply can generate an SRQ atpower-on or when there...

Remote Operation 71 Initial Conditions Immediately after power on from the factory, the power supply automatically undergoes a self-test and sets all parametersto the values contained in Table 5-3. The values in the first part of the table come from storage register 0 and were stored atthe factory. ...

Remote Operation 76 The Clear Command This command will return the power supply to its power-on state and all parameters are returned to their initial power-onvalues except for the following: 1. The store/recall registers are not cleared. 2. The power supply remains addressed to listen. 3. The PON b...

Remote Operation 78 UNMASK 2,XXX where XXX specifies the numeric code (0 to 255) for the unmasked conditions (see Table 5-5). If during operation, theoutput experiences any of the previously unmasked conditions, it will set the corresponding bit(s) in its fault register. Remember that the bits in th...

Remote Operation 79 Service Request Generation When operating your supply, you may want it to request service every time a fault or a programming error conditionoccurs. To do this you send a service request (SRQ) command. When the condition is true, the power supply responds bysetting the RQS bit in...

Remote Operation 80 The ability to generate service requests can be enabled or disabled using the SRQ command as described below. To disable the service request capability, except for power-on, send: SRQ 0 To enable the service request capability for all output faults, send: SRQ 1 To enable the serv...

Local Operation 85 6 Local Operation Introduction Chapter 3 introduced you to the supply’s front panel controls and indicators to help you turn on the supply and perform thecheckout procedures that were given in that chapter. The following paragraphs describe how to use all of the front panelcontrol...

Local Operation 86 Figure 6-1. Front Panel (Model 6626A shown) Pressing the ENTER key will enter the values displayed for the function indicated, initiate that function, and return thedisplay to the metering mode in which the measured output voltage and current for the selected output are displayed....

Local Operation 88 Setting Overvoltage Protection Programmable overvoltage protection (OVP) guards your load against overvoltage by crowbarring and downprogrammingthe power supply output if the programmed overvoltage setting is exceeded. A fixed OV circuit with a trip level about 20 percent above th...

Alignment Procedures 91 A Alignment Procedures Introduction This appendix contains the software alignment procedures for the power supply. These supplies should be aligned twice ayear, or whenever certain repairs are made (see Service Manual). The equipment that you need and the test setups to perfo...

Programming with a Series 200/300 Computer 103 B Programming With a Series 200/300 Computer Introduction The purpose of this appendix is to serve as an introduction to programming your power supply with an HP Series 200/300computer using the BASIC language. Examples are included that employ some of ...

Programming with a Series 200/300 Computer 104 VOLTAGE AND CURRENT PROGRAMMING WITH VARIABLES You can use variables in a program to represent data values in the device commands. This is useful in applications thatrequire changing the voltage and current values to different predetermined settings. Th...

Programming with a Series 200/300 Computer 105 10 ASSIGN @Ps TO 70520 OUTPUT @Ps;’’VSET?1’’30 ENTER @Ps;Vsl40 OUTPUT @Ps;"ISET?1"50 ENTER @Ps;Isl60 PRINT ’’VOLTAGE SETTING OF OUTPUT #1 = ";Vsl70 PRINT "CURRENT LIMIT SETTING OF OUTPUT #1 = ";Isl80 END Line 10: Assigns the I/O path...

Command Summary 109 C Command Summary Introduction For convenience, a “quick reference” listing tabulating general command headers, and calibration command headers isshown at the beginning of Table C-1 (page 110). (Note that calibration commands are described in detail in Appendix A.)Table C-2 (page...

Error Codes and Messages 117 D Error Codes and Messages Introduction This appendix describes the GP-IB error codes that can be readback to the controller and the error messages that can bedisplayed on the power supply’s front panel. A brief explanation of each code and message is also given. The err...

Manual Backdating 121 E Manual Backdating Introduction The backdating information in this chapter applies to units that have the following serial numbers: Agilent Model 6625A. serials 2831A-00101 to 00663Agilent Model 6626A, serials 2831A-00101 to 00823Agilent Model 6628A, serials 2922A-00101 to 002...

Agilent Sales and Support Office 122 Agilent Sales and Support Office For more information about Agilent Technologies test and measurement products, applications, services, and fora current sales office listing, visit our web site: http://www.agilent.com/find/tmdir You can also contact one of the fo...

123 Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 2/01/00 All references to HP have been changed to Agilent. All references to HP-IB have been changed to GPIB. 9/20/04 The Declaration of Conformity has been updated.