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Agilent Technologies 66 A Series Operating Manual
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Agilent Technologies 66 A Series Operating Manual

Multiple output linear system dc power supply
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  • Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Click HERE Find the Keysight / Agilent 5063-9221 at our website:...
  • Page 2 OPERATING MANUAL MULTIPLE OUTPUT LINEAR SYSTEM DC POWER SUPPLY AGILENT MODELS 6625A, 6626A, 6628A, and 6629A Agilent Part No 06626-90001 Microfiche Part No. 06626-90002 Printed in Malaysia September, 2004 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 90 days from date of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which prove to be defective. Agilent does not warrant that the operation of the software, firmware, or hardware shall be uninterrupted or error free.
  • Page 4 Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained.
  • Page 5 SAFETY SUMMARY (continued) GENERAL Any LEDs used in this product are Class 1 LEDs as per IEC 825-1. This ISM device complies with Canadian ICES-001. Cet appareil ISM est conforme à la norme NMB-001 du Canada. ENVIRONMENTAL CONDITIONS This instrument is intended for indoor use in an installation category II, pollution degree 2 environment. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters.
  • Page 6 This DoC applies to the above-listed products placed on the EU market after: January 1, 2004 Date Bill Darcy/ Regulations Manager For further information, please contact your local Agilent Technologies sales office, agent or distributor. Authorized EU-representative: Agilent Technologies Deutschland GmbH, Herrenberger Straβe 130, D 71034 Böblingen, Germany Revision: B.00.00 Issue Date: Created on 11/24/2003 3:33 Document No.
  • Page 7 WHAT THIS MANUAL CONTAINS It contains information relating to the installation, operation, and programming of these supplies as outlined below. Maintenance and troubleshooting instructions are given in a separate Service Manual (Agilent Part No. 06626-90003). Chapter 1.--General Information Chapter 1 contains a general description of the power supplies as well as instrument specifications and information concerning options and accessories.

  • Page 8: Table Of Contents

    Table Of Contents General Information Introduction..............................11 Safety Considerations............................11 Instrument and Manual Identification......................11 Options................................11 Accessories..............................12 Description ..............................12 Basic Operation.............................14 GP-IB Board..............................14 Output Boards............................15 Specifications..............................15 Qualifying Conditions..........................15 Definitions..............................15 Installation Introduction..............................25 Initial Inspection............................25 Location and Cooling............................25 Input Power Requirements....
  • Page 9 Table Of Contents (continued) Positive and Negative Voltages.........................51 Remote Voltage Sensing..........................51 Remote Sense Connections........................52 Output Noise Considerations........................53 Programming Response Time with an Output Capacitor................53 Open Sense Leads............................54 Overvoltage Trigger Connections.........................54 External Trigger Circuit..........................54 Power Supply Protection Considerations .....................55 Battery Charging......
  • Page 10 Table Of Contents (continued) Local Control Of Output Functions.......................85 General..............................85 Setting Voltage and Voltage Range......................86 Setting Current and Current Range......................87 Enabling/Disabling an Output........................87 Setting Overvoltage Protection........................88 Resetting Overvoltage Protection......................88 Enabling/Disabling Overcurrent Protection....................88 Resetting Overcurrent Protection......................88 Local Control Of System Functions......................88 Setting the Supply’s GP-IB Address......................88 Displaying Error Messages........................89 Storing and Recalling Voltage and Current.
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  • Page 12: General Information

    Instrument and Manual Identification Agilent Technologies power supplies are identified by a two-part serial number, i.e. 2601A-00101. The first part of the serial number (the prefix) is a number/letter combination that denotes either the date of manufacture or the date of a significant design change.

  • Page 13: Accessories

    Accessories 10833A GP-IB cable, 1 m (3.3 ft) 10833B GP-IB cable, 2 m (6.6 ft) 10833C GP-IB cable, 4 m (13.2 ft) 10833D GP-IB cable, 0.5 m (1.6 ft) 10834A GP-IB connector extender Slide mount kit (1494-0059) Description The Agilent power supply features a combination of programming capabilities and linear power supply performance that make them ideal for systems applications.
  • Page 14 Your multiple output power supply can be both a listener and a talker on the GP-IB. (GP-IB is Agilent Technologies’ implementation of IEEE-488). The built-in interface is tailored to the supply, resulting in simpler programming. Voltage and current settings can be sent directly to the specified output in volts and amps.

  • Page 15: Basic Operation

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

  • Page 16: Output Boards

    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 regulation techniques.
  • Page 17 Output response time: Beginning at the time the power supply has finished processing a VSET command (change output voltage), the maximum time for the output voltage to settle to within a settling band about the final value from any specified operating point. This value must be added to the command processing time to obtain total programming time (see Figure 1-3).
  • Page 18 Table 1-2. Specifications (continued) Source Effect: Voltage 0.5 mV 0.5 mV 0.5 mV 0.5 mV + Current 0.005 mA 0.005 mA 0.01 mA 0.01 mA Programming Accuracy: Note: The programming accuracy specifications may degrade slightly when the unit is subjected to an RF field equal to or greater than 3 volts/meter.
  • Page 19 Table 1-3. Supplemental Characteristics (continued) Output Power 25 Watt Output 50 Watt Output Output Range Lo Range Hi Range Lo Range Hi Range Output Volts 0-7 V 0-50 V 0-16 V 0-50 V Output Amps 0-15 mA 0-500 mA 0-200 mA 0-2 A Temperature Coefficient-Measurement: Voltage...
  • Page 20 Table 1-3. Supplemental Characteristics (continued) High Line Inrush Current: 100 V Opt 120 V Opt 220 V Opt 240 V Opt Peak Value 85 A 85 A 50 A 50 A rms Value 6.3A 5.7 A 3.0 A 3.0 A Fuse Rating GP-IB Interface Capabilities: SH1.
  • Page 21 Table 1-3. Supplemental Characteristics (continued) Weight: Agilent 6625A, 6628A Agilent 6626A, 6629A 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...
  • Page 22 Figure 1-4. CV Operation with Capacitive Load, Stability Graph for all Outputs General Information 21 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 23 Figure 1-5. Output Noise (Typical) CC Mode Figure 1-6. Output Noise (Typical) CV Mode General Information Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 24 Figure 1-7. Output Impedance (Typical) Graph (See Supplemental Characteristics) General Information 23 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 25 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 26: Installation

    The fan, located at the rear of the unit, cools the supply by drawing air in through the openings on the rear panel and exhausting it through openings on the sides. Using Agilent Technologies rack mount kits will not impede the flow of air.

  • Page 27: Input Power Requirements

    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 66 Hz. The input voltage range, maximum input current, high line inrush current (PK), and the fuse required for each of the nominal inputs are listed in Table 2-1.
  • Page 28 Figure 2-2. Rear Panel Detail (Agilent 6626A Shown) Table 2-2 Line Fuses Line Fuse Agilent Part Number (for ¼ X 1¼ in. fuses Voltage Needed only) 100/120 V 2110-0342 220/240 V 2110-0055 Note: All fuses are rated for 250 V. Figure 2-3.

  • Page 29: Power Cord

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

  • Page 30: Line Voltage Conversion

    The GP-IB connector on the rear panel connects your power supply to your computer and other GP-IB devices (see Figure 2-2). Accessories (page 12) in Chapter 1 lists the cables and cable accessories that are available from Agilent Technologies. An GP-IB system can be connected together in any configuration (star, linear, or both) as long as the following rules are observed 1.
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  • Page 32: Getting Started

    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, the supply’s front panel controls and indicators are briefly described.
  • Page 33 6626A SYSTEM DC POWER SUPPLY SYSTEM OUTPUT ENTRY VOLTS AMPS 45.153 14.235m OUTPUT ADDR RANGE VOLT SELECT OVSET VOLT VSET UNR OCP ERR RMT ADDR SRQ -- OUTPUT -- ENBLD ISET ENTER CURR OUTPUT RESET CURR ON/OFF LINE Figure 3-1. Agilent 6626A Front Panel Table 3-1.
  • Page 34 Table 3-1. Controls and Indicators (continued) Number Controls/Indicators Description Page 4 (cont) UNR- Indicates that the selected output channel is unregulated; i.e., it is not regulated by CV or CC control loops. OCP ENBLD - Indicates that the overcurrent protection 3-8, 6-4, function for the selected channel is enabled.
  • Page 35 Table 3-1. Controls and Indicators (continued) Number Controls/Indicators Description Page Output Control Keys OUTPUT SELECT - Selects one of the output 3-7, 3-8, (These twelve keys are channels for local control or display. This key allows the 6-1--6-4 output dependent). channels to be selected in forward (Ð) or reverse (Ï) sequence.
  • Page 36 Table 3-1. Controls and Indicators (continued) Number Controls/Indicators Description Page Ñ CURRENT - Increases the selected output current by 7 (cont) 3-9, 6-3 an LSB and then at a faster rate as the key is kept pressed, or after the RANGE V/I key has been pressed, sets the selected output to the high current range.

  • Page 37: Turning On Your Supply

    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. •...

  • Page 38: Self Test Errors

    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 indicate the type of failure and the output channel on which it occurred. Figure 3-5 shows that self-test detected an error in output channel 3.

  • Page 39: Voltage Test

    Voltage Test 1. Set the voltage of the selected output to 10 V by pressing: VSET ENTER 2. Check that the display reads approximately 10 V and 0 A and the CV annunciator is on indicating that the supply is in the constant voltage mode of operation.

  • Page 40: Changing Resolution Range

    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 ENTER 8.

  • Page 41: Enter/Output Statements

    Enter/Output Statements The programming statements you use to operate your supply from remote depend on your computer and its language. In particular, you need to know the statements your computer uses to output and enter information. For example, the Agilent BASIC language statement that addresses the power supply to listen and sends the command to the power supply is: OUTPUT The Agilent BASIC language statement that addresses the power supply to talk and reads back data from the power supply...

  • Page 42: Sending A Remote Command

    Sending a Remote Command To send the power supply a remote command, combine your computer’s output statement with the GP-IB interface select code, the GP-IB device address, and finally, the power supply command. For example, to set the output voltage of output channel 1 to 2 volts, send: Getting Data From The Supply The supply is capable of measuring the values of its output parameters in response to queries.
  • Page 43 Each of these commands is briefly discussed in the following paragraphs to help you get started in programming your supply. To know more about these commands, refer to Chapter 5. The VRSET and IRSET commands select the range the power supply operates in. Two ranges are available for each output - standard resolution, and high resolution (see Table 1-2).

  • Page 44: Returning The Supply To Local Mode

    Output On/Off. You can turn a specified output on or off. Individual outputs can be controlled as shown below. To turn off output 1, send: OUTPUT 705; ’’OUT 1,0" When an output is turned off, it is set to 0 volts and to the minimum current limit value To turn on output 1, send: OUTPUT 705;...
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  • Page 46: Output Connections And Operating Information

    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. Some general operating information is included in this chapter to help you understand how the power supply operates under various load conditions.

  • Page 47: Operating Quadrants

    Operating Quadrants Figures 4-2A and 4-2B show the operating locus of your power supply in three quadrants. The area in quadrant 1 shows the operating locus defined by the voltage and current settings of each output. The area in quadrant 2 indicates the locus where each output can operate as a current sink.

  • Page 48: Operating Range

    Figure 4-3 shows the current sink characteristics lower voltages in greater detail. The area in quadrant 4 illustrates the reverse polarity diode characteristics of each output. Do not operate any output with reverse-voltage currents that are greater than the maximum rating of the output. Figure 4-3.

  • Page 49: Protection Features

    The readback resolution of the 25 watt outputs when metering voltages of 7 volts or below, will be 483 µV. 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 of 15 mA or below, the readback resolution will be 1 µA.

  • Page 50: Connecting The Load

    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 outputs in parallel.

  • Page 51: Multiple Loads

    Note To prevent tripping of the overvoltage circuit, pick a wire size sufficient to handle the FULL output current 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 the maximum lengths to limit the voltage drop to 1.0 volts for various currents.

  • Page 52: Positive And Negative Voltages

    Figure 4-4. Optimum Hookup for Multiple Loads, Local Sensing Note When a load is connected through relay or switch contacts, contact bounce may activate the overvoltage circuit and shut down the supply. Therefore, it is recommended that the output be downprogrammed to 0 or turned-off (disabled) before the relay (or switch) contact is opened or closed.

  • Page 53: Remote Sense Connections

    Figure 4-5. Remote Voltage Sensing The maximum voltage available at the power supply output terminals during remote sensing (see Figure 4-6) is 50.5 volts. This allows the sum of the voltage across both load leads to equal 10 volts maximum. For lower output voltages refer to Figure 4-3.

  • Page 54: Output Noise Considerations

    Figure 4-6. Total Allowable Load Lead Voltage Drop (total of both leads) with Remote Sensing Output Noise Considerations Any noise picked up on the sense leads will appear at the supply’s output and may adversely affect CV load regulation. Twist the sense leads or use a ribbon cable to minimize the pickup of external noise. In extremely noisy environments it may be necessary to shield the sense leads.

  • Page 55: Open Sense Leads

    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 inadvertently become open circuited. The power supply includes protection resistors that reduce the effect of open sense leads during remote-sensing operation.

  • Page 56: Power Supply Protection Considerations

    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 diode be added to prevent damage to the supply during an overvoltage shutdown.

  • Page 57: Capacitive Load Limitation

    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 primarily intended for use as a protection feature as described on page 48. Repetitive (over 100 cycles) tripping of the overvoltage circuit with output capacitors greater than 2000 µF may result in eventual damage to the supply.

  • Page 58: Cv Operation

    Figure 4-11. Parallel Connections with Local Sensing CV Operation For CV operation, one output must operate in CC mode and the other output must operate in CV mode. Although each output operates independently of the other, the output that is operating in CV mode will be ’’controlling" the voltage regulation of both outputs.

  • Page 59: Cc Operation

    CC Operation For CC operation, set the output voltages as outlined in CV operation (page 57), or alternatively, program the voltage settings of both outputs to the same voltage limit point. Then program the current of each output so that the sum of both currents equals the total desired operating current.

  • Page 60: Series Operation

    Series Operation SHOCK HAZARD. Floating voltages must not exceed 240 Vdc. No output terminal may be more than 240 Vdc from chassis ground. Connect in series only outputs that have equivalent current ratings. Each output has a reverse voltage protection diode across its output terminals. The current conducted by this diode is not internally limited by the output.

  • Page 61: Cc Operation

    CC Operation For CC operation, the current setting of each output must be programmed to the desired operating current. The sum of the voltage settings determines the voltage limit point. As an example, one way to program the voltage of the output is to set the voltage of each output to one half of the total voltage limit point.

  • Page 62: Bi-Polar Operation

    Voltage All series specifications referring to voltage are twice the single output specification except for programming resolution which is the same as for a single output. Current All series specifications referring to current are the same as for a single output except for CC load effect, CC load cross regulation, CC source effect, and CC short term drift which are twice the current programming accuracy (including the percentage portion).
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  • Page 64: Remote Operation

    Remote Operation Introduction Chapter 3 introduced you to the basics of remote operation and provided a few simple examples using a Series 200/300 computer as the GP-IB controller. This chapter contains all the information required to control your power supply remotely and discusses in greater detail how each of the commands can be implemented.

  • Page 65: Gp-Ib Address Selection

    IEEE-488 does not define what data an instrument should put on a bus in response to parallel poll. Many instruments such as Agilent Technologies power supplies indicate the state of their RQS bit, but the operator should not assume that all instruments on the bus respond to parallel poll with their RQS bit.

  • Page 66: Power-On Service Request (Pon)

    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 or disabled by sending a PON command (see page 80). When the request is enabled, the supply can generate an SRQ at power-on or when there is a momentary loss in power.
  • Page 67 Table 5-1. Power Supply Commands (continued) Command Header Output Data Range Syntax Channel (Fig. 5-2) Query present hardware error ERR? See Table 5-8 Query fault register FAULT? 1, 2, 3, 4 Query the model number of supply Program the I DAC in counts IDAC 1, 2, 3, 4 See Service Manual...

  • Page 68: Numeric Data

    Table 5-1. Power Supply Commands (continued) Command Header Output Data Range Syntax Channel (Fig. 5-2) Store present output state 0-10 Query preset status of output STS? 1, 2, 3, 4 Perform self test on GP-IB interface TEST? Set bits in mask register UNMASK 1, 2, 3, 4 0-255...
  • Page 69 Figure 5-2 (Sheet 1 of 2). Syntax Forms For Power Supply Commands Remote Operation Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 70 Figure 5-2 (Sheet 2 of 2). Syntax Forms For Power Supply Commands Remote Operation 69 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 71: Order Of Execution

    Table 5-2. Power Supply Queries Query Header Channel Response Initial Value Syntax (Note 7) (Note 1) (Notes 5 and 6) (Fig. 5-2) Voltage Setting VSET? 1,2,3,4 SZD.DDD(Note 3) 0(Note 8) Current Setting ISET? 1,2,3,4 (Note 2) 10 mA (Note 8) Full Scale Current Range IRSET? 1,2,3,4...

  • Page 72: Initial Conditions

    Initial Conditions Immediately after power on from the factory, the power supply automatically undergoes a self-test and sets all parameters to the values contained in Table 5-3. The values in the first part of the table come from storage register 0 and were stored at the factory.
  • Page 73 VSET 1,.45 If the output channel is operating in constant voltage mode (CV annunciator on) then the actual voltage is the programmed voltage, but in CC mode of operation (CC annunciator on), the programmed voltage is the voltage limit for that output. When programming a value of voltage, the current setpoint will be changed if the total power is greater than the power boundary (see Figure 4-2).

  • Page 74: Current Programming

    Current Programming To program the current, send the output channel and the programmed value in amps. In the example below, output 1 is programmed to 15 mA. ISET 1,0.015 The value you send must always be in amps. For example if you want to program 95 milliamps, convert to amps and then send the command ISET 1,.095 If the output channel is in constant current (CC) mode of operation, then the actual current is the programmed current but if...

  • Page 75: Output On/Off

    Output On/Off The OUT command disables/enables an output channel of the power supply. It will not disturb any other programmed function nor will it reset the protection circuits. You can control individual outputs with the OUT command as shown below. For example, to disable output channel 1 send the following: OUT 1,0 To enable output channel 1 send the following command OUT 1,1...

  • Page 76: Overcurrent Protection

    Overcurrent Protection (OCP) The OCP is a protection feature employed by the power supply to guard against excessive output currents. When the output enters the + CC mode and the OCP is enabled, the OCP circuit down programs the output voltage and disables the output. To enable the OCP, for output channel 1, send the command OCP 1,1 To disable the OCP, send the command...

  • Page 77: The Clear Command

    The Clear Command This command will return the power supply to its power-on state and all parameters are returned to their initial power-on values except for the following: 1. The store/recall registers are not cleared. 2. The power supply remains addressed to listen. 3.
  • Page 78 Table 5-5. Bit Assignment for the Status, Astatus, Fault, and Mask Registers Bit Position Bit Weight Meaning Where CV = Constant Voltage Mode + CC = Positive Constant Current Mode - CC = Negative Current Limit Mode OV = Overvoltage Protection circuit tripped OT = Over Temperature Protection circuit tripped UNR =...
  • Page 79 UNMASK 2,XXX where XXX specifies the numeric code (0 to 255) for the unmasked conditions (see Table 5-5). If during operation, the output experiences any of the previously unmasked conditions, it will set the corresponding bit(s) in its fault register. Remember that the bits in the fault register can be set when there is a change in either the status register or the mask register.

  • Page 80: Service Request Generation

    Service Request Generation When operating your supply, you may want it to request service every time a fault or a programming error condition occurs. To do this you send a service request (SRQ) command. When the condition is true, the power supply responds by setting the RQS bit in the serial poll register, setting the SRQ annunciator on the front panel, and issuing an SRQ over the GP-IB.

  • Page 81: Reprogramming Delay

    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 service request capability for errors, send: SRQ 2...

  • Page 82: Display On/Off

    Reprogramming delay will delay the onset of certain fault conditions and prevent the power supply from registering a fault when these conditions are true. When the delay is in effect, the CV, + CC, - CC and UNR bits of the status register are masked and cannot communicate with the mask and fault registers and the OCP function.

  • Page 83: Other Queries

    Other Queries In the examples discussed above, you saw how to use queries for each function discussed. The following paragraphs describe other queries which were not previously covered. ERROR Query. The power supply can detect both programming and hardware errors. You can use either the front panel (see page 89) or the GP-IB to find out the type of error.
  • Page 84 To enable all outputs in constant current mode at turn on send: DCPON 2 To disable all outputs in constant current mode at turn-on send: DCPON 3 Table 5-8. Error Messages Front Panel GP-IB Explanation Response Code NO ERROR This is the response to the ERR? query when there are no errors. INVALID CHAR You sent the supply a character it did not recognize.
  • Page 85 Table 5-8. Error Messages (continued) Front Panel GP-IB Explanation Response Code HDW ERR CH 1 Errors 11 through 14 refer to a specific output where there is an output error. Service is required. HDW ERR CH 2 Same as in Error #11. HDW ERR CH 3 Same as in Error #11.

  • Page 86: Local Operation

    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 the checkout procedures that were given in that chapter. The following paragraphs describe how to use all of the front panel controls and indicators.

  • Page 87: Setting Voltage And Voltage Range

    LOCAL MODE OUTPUT ANNUNCIATOR DISPLAY OUTPUT FUNCTION KEYS CHANNEL 1 6626A SYSTEM DC POWER SUPPLY SYSTEM OUTPUT ENTRY VOLTS AMPS OUTPUT 45.153 14.235m ADDR RANGE VOLT SELECT OVSET VOLT VSET UNR OCP ERR RMT ADDR SRQ -- OUTPUT -- ENBLD ISET ENTER CURR...

  • Page 88: Setting Current And Current Range

    The voltage step keys can also be used to change the voltage setting. ÑVOLT ÒVOLT VSET then ENTER The voltage can be set in the immediate execute mode. This mode is in effect when background ÑVOLT ÒVOLT metering is in effect. Pressing will change the setting and the effect on the voltage and current can be observed on the display.

  • Page 89: Setting Overvoltage Protection

    Setting Overvoltage Protection Programmable overvoltage protection (OVP) guards your load against overvoltage by crowbarring and downprogramming the power supply output if the programmed overvoltage setting is exceeded. A fixed OV circuit with a trip level about 20 percent above the maximum programmable voltage acts as a backup to the programmable OVP.

  • Page 90: Displaying Error Messages

    For example, you can change the address of your supply to 10 by pressing: ADDR ENTER Displaying Error Messages The power supply can detect both programming and hardware errors. Upon detecting an error, the ERR annunciator on the front panel comes on and the ERR bit in the serial poll register will be set (see page 78). When an error is detected, you can display the error message by pressing the ERR key.
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  • Page 92: A Alignment Procedures

    Alignment Procedures Introduction This appendix contains the software alignment procedures for the power supply. These supplies should be aligned twice a year, or whenever certain repairs are made (see Service Manual). The equipment that you need and the test setups to perform the alignment are also shown. A listing of the alignment procedure appears at the end of Appendix A.
  • Page 93 The program contains embedded comments (identified by a leading asterisk {! } ) which explain various sections and procedures. To reduce keystroking, the program may be shortened to a minimum number of lines by eliminating these comments. The alignment program is available on a 5¼ floppy (Agilent P/N 06626-10001) or 3½ inch microfloppy (Agilent P/N 06626-10002).
  • Page 94 After testing of a channel is completed, the program will check if any errors have occurred (the subprogram is called in line 850 and performed in lines 3670 - 3780). If an error has occurred, a message will be sent to the output device (CRT). After all outputs are tested without errors, the CAL MODE will be turned off, and the calibration constants stored.
  • Page 95 Figure A-3 Figure A-4 Figure A-5 Alignment Procedures Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 96: Alignment Program

    Alignment Program 10 ! This program called "ALIGN_6626" will align 20 ! the Agilent6625A, 26, 28 and 29A Power Supplies It 30 ! requires an Agilent3458A DMM and a four terminal 40 ! 0.1 ohm current shunt accurate to +/-50 ppm 50 ! 60 ! May 06,l989 Rev A.03.01 70 !
  • Page 97 Alignment Program (continued) ! -1 is reverse polarity, this saves ! reversing leads as sink channel ! becomes the source for other channel 560 Chan=1 ! Select channel to cal sink (-CC) 570 Other_chan=2 ! Select current source channel 580 Get_data ! Call program with range data 590 Cal_sink(Irng_hi,1) ! Call program to cal high range sink...
  • Page 98 Alignment Program (continued) 1050 ! 1060 ! 1070 ! 1080 DEF FNDci(I_range) ! Function to read current 1090 COM /Vm/ @Vm 1100 COM /Shunt/ Shunt_r 1110 IF I_range=2 THEN ! 2A must read across shunt 1120 Amps=FNDcv/Shunt_r ! Convert shunt voltage to Amps 1130 ELSE! ! <2A read direct from DMM...
  • Page 99 Alignment Program (continued) 1570 PRINT "Press CONTINUE when ready 1580 PAUSE 1590 Output_on 1600 1610 Cal_v: 1620 Clear_screen 1630 PRINT "Calibrating the";V_range;"volt range programming” 1640 1650 OUTPUT @Ps;"VRSET" ;Chan,V_range ! Set voltage range 1660 1670 OUTPUT @Ps; VLO";Chan ! Set to low output voltage 1680 WAIT 1 ! Wait for supply to stabilize...
  • Page 100 Alignment Program (continued) 2090 ! 2100 ! 2110 Cal_current: SUB Cal_current(I_range) ! Subprogram to cal current 2120 COM /Ps/ Chan,Other_chan,@Ps,Model$[7] 2130 2140 IF I_range= .5 THEN GOTO Cal_i ! Skip setup instructions 2150 2160 Output_off 2170 2180 Clear_screen 2190 PRINT "Set up output";Chan;"for";I_range;”A current calibration” 2200 PRINT 2210...
  • Page 101 Alignment Program (continued) 2610 Irlo=FNDci(I_range) ! Read low output current 2620 2630 OUTPUT @Ps;"IRHI";Chan ! Set high readback current 2640 REPEAT ! Wait for supply to finish 2650 UNTIL BIT(SPOLL(@Ps),4) ! Finished when Bit 4 goes true 2660 Irhi=FNDci(I_range) ! Read high output current 2670 2680 OUTPUT @Ps;"IRDAT";Chan,Irlo,Irhi...
  • Page 102 Alignment Program (continued) 3130 PRINT "Calibrating output";Chan;"";I_range;"A current sink readback" 3140 3150 OUTPUT @Ps;"IRSET";Chan,I_range;";IRSET";Other chan,I_range 3160 ! Set I range for source and 3170 ! sink range 3180 OUTPUT @Ps; “ISET”;Other_chan,0;”;VSET”;Other_chan,7 3190 ! Set source V & I output 3200 Output_on 3210 WAIT 1...
  • Page 103 Alignment Program (continued) 3650 ! 3660 ! 3670 Check_error:SUB Check_error ! Subprogram to check for errors 3680 COM /Ps/ Chan,Other_chan,@Ps,Model$[7] 3690 Clear_screen 3700 PRINT “Checking for errors” 3710 OUTPUT @Ps;”ERR?” ! Query supply for errors 3720 ENTER @Ps;Err ! Enter the error number 3730 IF Err>0 THEN ! If an error then print msg...

  • Page 104: B Programming With A Series 200/300 Computer

    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 200/300 computer using the BASIC language. Examples are included that employ some of the most frequently used functions. These examples have been written so that they will run on all power supplies.

  • Page 105: Voltage And Current Programming With Variables

    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 that require changing the voltage and current values to different predetermined settings. The following program uses a variable in a FOR NEXT loop to ramp up output voltage in 0.1 volt steps from 0 to 5 volts.

  • Page 106: Programming Power Supply Registers

    10 ASSIGN @Ps TO 705 20 OUTPUT @Ps;’’VSET?1’’ 30 ENTER @Ps;Vsl 40 OUTPUT @Ps;"ISET?1" 50 ENTER @Ps;Isl 60 PRINT ’’VOLTAGE SETTING OF OUTPUT #1 = ";Vsl 70 PRINT "CURRENT LIMIT SETTING OF OUTPUT #1 = ";Isl 80 END Line 10: Assigns the I/O pathname to the power supply.

  • Page 107: Service Request And Serial Poll

    Service Request and Serial Poll The fault and mask registers, when used in conjunction with the service request and serial poll functions, allow you to select which conditions can cause computer interrupts. The fault and mask registers can also be used independently of the serial poll or service request if so desired.

  • Page 108: Error Detection

    Error Detection The power supply can recognize programming errors and can inform you when a programming error occurs. When an error is detected, no attempt is made to execute the command. Instead, a bit in the serial poll register is set. If SRQ2 or SRQ3 is set, an interrupt will be generated.

  • Page 109: Stored Operating States

    LINE 10: Assigns the I/O path name to the power supply. LINE 20: Declares a common block for the I/O path name. LINE 30: Defines interrupt on softkey depression and branch to error routine. LINE 40: Idles on softkey definition. LINE 80: Defines subprogram Err _ trap LINE 90:...

  • Page 110: C Command Summary

    Command Summary Introduction For convenience, a “quick reference” listing tabulating general command headers, and calibration command headers is shown at the beginning of Table C-1 (page 110). (Note that calibration commands are described in detail in Appendix A.) Table C-2 (pages 111-115) provides an alphabetical listing and a brief description of each command that may be sent to the power supplies.
  • Page 111 Table C-1 Quick Reference Listing of Commands General Commands ASTS? < ch > OUT < ch >, < 1 (on) or 0 (off) > OUT? < ch > CMODE < 1 (on) or 0 (off) > OVRST < ch > CMODE? OVSET <...
  • Page 112 Table C-2 Command Summary ASTS? < ch > Queries the accumulated status (ASTS) of the specified output < ch > . The response (integer 0-255) represents the sum of the binary weights of the ASTS register bits (see page 77). The ASTS register is automatically set to the present status after being queried.
  • Page 113 Table C-2 Command Summary (continued) Queries the identification (model number) of the supply. (see page 82). IDATA < ch >, < Ilo > , < Ihi > Sends data to calibrate the current setting circuits of the specified output < ch >. Ilo and Ihi are measured values which the supply uses to calculate correction constants (see Appendix A).
  • Page 114 Table C-2 Command Summary (continued) NIDAT < ch > . < Ilo > . < Ihi > Sends data to calibrate - current readback for the selected output < ch > . This command must be sent after IRLN and IRHN commands. OCP <...
  • Page 115 Table C-2 Command Summary (continued) ROM? Queries the revision date of the power supply’s firmware. See service manual. SROM? Queries the revision date of the secondary ROM. See service manual. SRQ <X> Sets the causes for generating SRQ. Setting < x > can be a 0, 1, 2, or 3 as described on page 79.
  • Page 116 Table C-2 Command Summary (continued) VMUX? < ch > , < x > Queries the measurement of the input < x > to the analog multiplexer on the specified output < ch > (see Appendix A). VOUT? < ch > Queries the measured output voltage of the specified output <...
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  • Page 118: Introduction

    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 be displayed on the power supply’s front panel. A brief explanation of each code and message is also given. The error codes and/or messages fall into three categories: Power-on Self Test Messages, responses to the ERR? query, and responses to the TEST? query.
  • Page 119 Table D-2. ERROR Responses (continued) Error Code Message Explanation (ERR? query) (ERR key) INVALID STR You sent a command the supply does not understand. Resend recognizable command. SYNTAX ERROR You sent a command with improper syntax. Check syntax of your command (see Chapter 5).
  • Page 120 Table D-2. ERROR Responses (continued) Error Code Message Explanation (ERR? query) (ERR key) CAL LOCKED Calibration was attempted with the calibration jumper on the GP-IB board in the lockout position (See Section IV in the Service Manual). Reposition the jumper and re-calibrate if this is desired. SKIP SLF TST The self test jumper on the GP-IB board is in the Skip Self Test Position (See Section IV in the Service Manual).
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  • Page 122: E Manual Backdating

    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 00663 Agilent Model 6626A, serials 2831A-00101 to 00823 Agilent Model 6628A, serials 2922A-00101 to 00232 Agilent Model 6629A, serials 2920A-00101 to 00292 Make Changes On page 29, replace the information in Line Voltage Conversion paragraph under steps number 2, 3, and 4 as follows: 2.

  • Page 123: Agilent Sales And Support Office

    Agilent Sales and Support Office 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.
  • Page 124 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.

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