HP (Hewlett-Packard) 6621A manual

1 OPERATING MANUAL SYSTEM DC POWER SUPPLIES HP MODELS 6621A, 6622A, 6623A, 6624A, and 6627A HP Part No 5957-6377 HP Model 6621A, Serials 3213A-01681 and Above* HP Model 6622A, Serials 3210A-02091 and Above* HP Model 6623A, Serials 3209A-02231 and Above* HP Model 6624A, Serials 3210A-06721 and Above* HP Model 6627A, Serials 3209A-00841 and Above* * [...]

2 CERTIFICATION Hewlett-Packard Company certifies that this product met its published specifications at time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the ca[...]

3 SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company a[...]

4 SAFETY SUMMARY (continued) GENERAL Any LEDs used in this product are Class 1 LEDs as per IEC 825-1. 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. Refer to the [...]

5 DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer's Name: Hewlett-Packard Company Manufacturer's Address: 150 Green Pond Road Rockaway, New Jersey 07866 U.S.A. declares that the Product Product Name: a) Multiple-Output System Power Supply b) Precision Multiple-Output System Power Supply Model Number: a) H[...]

6 WHAT THIS MANUAL CONTAINS This is the Operating manual for the HP 6621A through 6624A and 6627A Series of Multiple Output Linear System Power Supplies. 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 M[...]

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

8 Table Of Contents (continued) Positive and Negative Voltages .............. ............................................................................................. 49 Remote Voltage Sensing ..................... .................................................................................................... 49 Remote Sense Connections .[...]

9 Table Of Contents (continued) Setting Voltage ................................. .................................................................................................. 84 Setting Current ................................... ................................................................................................ 84 Enabling/Disab[...]

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General Information 11 1 General Information Introduction This chapter contains a general description of your power supply, as well as its performance specifications. Information about options, accessories, and HP-IB cables is also provided. This manual describes all five models in the HP 6621A- 6624A, and 6627A power supply family. Unless stated o[...]

General Information 12 Accessories 10833A HP-IB cable, 1 m (3.3 ft) 10833B HP-IB cable, 2 m (6.6 ft) 10833C HP-IB cable, 4 m (13.2 ft) 10833D HP-IB cable, 0.5 m (1.6 ft) 10834A HP-IB connector extender Slide mount kit (1494-0059) Description The HP 6621A-6624A, and 6627A Multiple Output Linear Power Supplies feature a combination of programming cap[...]

General Information 13 Storage and recall of programmed voltage and current values for all outputs. Queries of programmed functions or settings. Output enable or disable. Programming syntax error detection. Programmable delay time for service request and OCP mask. Voltage, current, and overvoltage calibration. HP-IB interface selftest. Message disp[...]

General Information 14 The HP-IB board also processes measurement and status data received from the output boards. This data may be read back over the HP-IB and/or displayed on the supply's front panel. The power supply has no potentiometers. Each output is individually calibrated over the HP-IB using calibration commands (see Appendix A). Cor[...]

General Information 15 Specifications Table 1-2 lists the performance specifications for the HP 662xA power supplies. Performance specifications describe the instrument's warranted performance. The service manual, Option 9l0, contains procedures for verifying the performance specifications. Table 1-3 lists the supplemental characteristics for [...]

General Information 16 Programming resolution: Average programming step size. Current Sinking ( - Current): Each output can sink as well as source current. The sinking capability is not programmable and depends upon the output voltage. The current sinking capability is described in greater detail in Chapter 4. Figure 1-3. Output Response Characteri[...]

General Information 17 Table 1-2. Specifications PERFORMANCE SPECIFICATIONS (0 to 55°C unless otherwise specified) Outputs: 40 W Low 40 W High 80 W Low 80 W High Voltage Voltage Voltage Voltage DC Output Ranges: All outputs will accept voltage programming commands 1% higher than those listed and current programming commands 3% higher than those li[...]

General Information 18 Table 1-3. Supplemental Characteristics Outputs 40 W Low 40 W High 80 W Low 80 W High Voltage Voltage Voltage Voltage Temperature Coefficient: Voltage (60 ppm + 0.4 mV)/ °C (60 ppm + 1 mV)/ °C (60 ppm + 0.4 mV)/ °C (60 ppm + 1 mV)/ °C +Current (160 ppm +0.2mA)/°C (160 ppm +0.1 mA)/°C (160 ppm +0.4mA)/°C (160 ppm +0.2 m[...]

General Information 19 Table 1-3. Supplemental Characteristics (continued) Outputs 40 W Low 40 W High 80 W Low 80 W High Voltage Voltage Voltage Voltage Programming Resolution: Voltage 6 mV 15 mV 6 mV 15 mV +Current 25 mA 10 mA 50 mA 20 mA OVP 100 mV 250 mV 100 mV 250 mV Readback Resolution: Voltage 6 mV 15 mV 6 mV 15 mV + or-Current 2 mA 0.8 mA 4 [...]

General Information 20 Table 1-3. Supplemental Characteristics (continued) Output Impedance: Approximated by a resistance in parallel with an inductance (see graphs in Figure 1-7). The values for each output are: 40 W Low Voltage 40 W High Voltage 80 W Low Voltage 80 W High Voltage 0.15 Ω , 2.0 µ H 0.3 Ω , 5 µ H 0.15 Ω , 0.8 µ H 0.5 Ω , [...]

General Information 21 Figure 1-4. CV Operation with Capacitive Load, Stability Graph for all Outputs[...]

General Information 22 Figure 1-5. CC Operation with Inductive Load, Small Signal Stability Graph for HV (0 to 50 V) Outputs[...]

General Information 23 Figure 1-6. CC Operation with Inductive Load, Small Signal Stability Graph for LV (0 to 20 V) Outputs[...]

General Information 24 Figure 1-7. Output Impedance (Typical) Graphs (See Supplemental Characteristics, Table 1-1)[...]

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 HP-IB cable. The power supply generates operating magnetic fields which may affect the operation of other instruments. If y[...]

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 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. You [...]

Installation 27 Figure 2-2. Rear Panel Detail (6624A Shown) Table 2-2 Line Fuses Line Voltage Fuse Needed HP Part Number(for 1/4 X 1-1/4 in. fuses only 100/120 V 8A 2110-0342 220/240 V 4A 2110-0055 Note All fuses are rated for 250 V. Figure 2-3. Line Module Detail[...]

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 2-4 shows the standard configuration of plugs used by Hewlett-Packard. Below each drawing is the HP part number for the replacement power cord equipped with a plug of that configuration. If a different powe[...]

Installation 29 FIRE HAZARD Make sure the replacement fuse is one of the same type (size) and rating (amps) that is consistent with the voltage level you are operating at. Do not use a substitute fuse; use a fuse with the same HP Part number listed in Table 2-2. 6. Close the door of the line module and insert the power cord in the ac input socket. [...]

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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, the supply's front panel controls an[...]

Getting Started 32 • The proper fuse is installed and the line cord is plugged in. If you have any questions concerning installation or power requirements, review Chapter 2. To turn on your supply, press the front panel LINE switch. When the power is initially applied, the supply performs a series of self tests which last about 3 seconds. Include[...]

Getting Started 33 Table 3-1. Controls and Indicators (continued) Number Controls/lndicators Description Page 3 OUTPUT Annunciators Indicate which output channel has been selected for front panel control and/or display. (Only one output annunciator can be on at a time.) 36, 37, 83, 83 4 Power Supply Status Annunciators (These five annunciators indi[...]

Getting Started 34 Table 3-1. Controls and Indicators (continued) Number Controls/lndicators Description Page 7 Output Control Keys (These twelve keys are output dependent). OUTPUT SELECT - Selects one of the output channels for local control or display. This key allows the channels to be selected in forward ( ç ) or reverse ( è ) sequence. VSET [...]

Getting Started 35 Table 3-1. Controls and Indicators (continued) Number Controls/lndicators Description Page 8 Numeric Entry Keys (These keys are used in conjunction with many of the System Control and Output Control keys to enter the desired values into the power supply. 0 to 9 - Set the value of the specified function and (e.g. VSET 16.550) ← [...]

Getting Started 36 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. Error messag[...]

Getting Started 37 Voltage Test 1. Set the voltage of the selected output to 10 V by pressing: VSET 1 0 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. Overvoltage Test 1. Program the overvoltage protection (OVP) to 19 V by pressin[...]

Getting Started 38 6. Check that the display reads approximately 0 volts and the minimum current limit value (0.05 to 0.13A depending upon the model and output, see Table 5-4). 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 [...]

Getting Started 39 OUTPUT The HP BASIC language statement that addresses the power supply to talk and reads back data from the power supply is: ENTER The supply's front panel ADDR annunciator is on when the supply is addressed to talk or to listen. Reading the HP-IB Address Before you can operate your power supply remotely, you need to know it[...]

Getting Started 40 Getting Data From The Supply The supply is capable of measuring the values of its output parameters in response to queries. In this example, the query asks the supply to measure the output voltage at output 1. When you send a query from remote, the supply does not display the response as it did when you executed the command from [...]

Getting Started 41 To set the voltage of output 1 to 5 volts, send: OUTPUT 705; "VSET 1,5" To set the current of output 2 to 450 milliamps, send: OUTPUT 705; "ISET 2 ,.450" Output Voltage and Current Measurement . You can instruct the supply to measure the actual output voltage and current at a specified output using the VOUT? a[...]

Getting Started 42 Overcurrent Protection . The output will go to the off state (0 volts and min. current) when the overcurrent protection (OCP) feature is enabled and the output is in the + CC mode. To enable the overcurrent protection mode for output 2, send: OUTPUT 705; "OCP 2,1" To disable the overcurrent protection mode for output 2,[...]

Output Connections and Operating Information 43 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. Some general operating information is included in this chapter to help you understand how the power supply operates under various [...]

Output Connections and Operating Information 44 Operating Quadrants Figure 4-2 shows 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 characteristics shown for quadrant 1 incorporate remote sensing and include the maximum ava[...]

Output Connections and Operating Information 45 Figure 4-2. Typical Output Range Characteristics[...]

Output Connections and Operating Information 46 A fixed overvoltage threshold of approximately 120% of the maximum rated output voltage is built into each output. Because the fixed overvoltage circuit is biased from the output terminals, it can be activated and provide protection even when the supply is not connected to the ac power line. The OVRST[...]

Output Connections and Operating Information 47 Figure 4- 3 Typical Downprogramming Characteristic Below 2.0 V Wire Size Selection FIRE HAZARD Select a wire size large enough to carry short-circuit current without overheating. Two factors must be considered when selecting wire size for load connections: conductor temperature and voltage drop. To sa[...]

Output Connections and Operating Information 48 available in the load leads for prolonged operation into a 5 A load during ac low line at high ambient temperature conditions. There is a similar stipulation for 80 W low voltage outputs at l0 A under the same conditions as above. See Figure 4-2A for worst case voltages available at the output termina[...]

Output Connections and Operating Information 49 Multiple Loads If you are using the as-shipped terminal block strapping pattern (local sensing) and are connecting multiple loads to one output, connect each load to the output terminals using separate connecting wires (see Figure 4-4). This minimizes mutual coupling effects and takes full advantage o[...]

Output Connections and Operating Information 50 sensing is especially useful for CV operation with load impedances that vary or have significant lead resistance. It has no effect during CC operation. Because sensing is independent of other power supply functions, remote sensing can be used regardless of how the power supply is programmed. Note that[...]

Output Connections and Operating Information 51 OUTPUT TYPE FORMULA (40 W & 80 W) LV Output CV Reg Error(mV) = Rs ( Vset 45 Vdrop 1.1 - ) HV Output CV Reg Error(mV) = Rs ( Vset 105 Vdrop 3.3 - ) CV Regulation Error = Remotely sensed voltage will change by this number of millivolts. Rs = Resistance of each sense lead in Ω . Vset = Programmed v[...]

Output Connections and Operating Information 52 Overvoltage Trigger Connections Each output of your power supply has two OV terminals on its rear panel terminal block. These terminals are labeled +OV and -OV. By connecting the OV terminals all in parallel as shown in Figure 4-7, an overvoltage shutdown on any one output will also trigger the overvo[...]

Output Connections and Operating Information 53 Figure 4-8. External Trigger Circuit The internal equivalent OV circuit is shown in Figure 4-9. Note the internal DC blocking capacitor, bleed resistor and noise bypass capacitors. Do not exceed 50 volts maximum between the + OV and the - OV terminals. The OV terminals are rated at ± 240 Vdc (includi[...]

Output Connections and Operating Information 54 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. Remember that each output has an overvoltage protection circ[...]

Output Connections and Operating Information 55 - V terminals of output 1 keeps the total length of the load leads to a minimum and reduces the number of wire connections that must be made at the load itself. Connecting the + S and - S terminals of output 2 directly to the sense terminals of output 1 compensates for the IR drop in the interconnecti[...]

Output Connections and Operating Information 56 CC Operation For CC operation, set the output voltages as outlined in CV operation (page 55), 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 curr[...]

Output Connections and Operating Information 57 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 con[...]

Output Connections and Operating Information 58 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[...]

Output Connections and Operating Information 59 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). Load Transient Recovery Time Lo[...]

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Remote Operation 61 5 Remote Operation Introduction Chapter 3 introduced you to the basics of remote operation and provided a few simple examples using a Series 200 computer as the HP-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 b[...]

Remote Operation 62 providing the controller is configured to service interrupts. A service request can be generated whenever there is a fault on one of the outputs (up to 4 outputs), a programming error has occurred, or at power on providing certain commands are sent. Service request commands are discussed in detail on page 76. The SRQ annunciator[...]

Remote Operation 63 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 77). When the request is enabled, the supply can generate an SRQ at power-on or when there is a momentary loss in power. You can execute a[...]

Remote Operation 64 The power supply will also return numeric data (ASCII characters) to your computer. The format of the numbers returned depends upon the type of data requested. Table 5-2 gives the format for data returned to the computer in response to any of the queries that are listed. Figure 5-2 (Sheet 1 of 2). Syntax Forms for Power Supply C[...]

Remote Operation 65 Figure 5-2 (Sheet 2 of 2). Syntax Forms for Power Supply Commands[...]

Remote Operation 66 Table 5-1. Power Supply Commands Command Header *Output Channel Data Range Syntax (Fig. 5-2) Set Voltage VSET 1,2,3,4 See Table 5-4 C4 Set Current ISET 1,2,3,4 See Table 5-4 C4 Set Overvoltage OVSET 1,2,3,4 See Table 5-4 C4 OC Protection On/Off OCP 1,2,3,4 0,1( off,on) C4 Output On/Off OUT 1,2,3,4 0,1( off,on) C4 Set the State o[...]

Remote Operation 67 NOTES: 1. Output channels 3 and 4 are not used in all models. (See Table 5-4). 2. Applies to 80 W Low V output. 3. Applies to 40 W High V and 80 W High V outputs. 4. ''X'' depends upon model. 5. A space is returned for a + sign. 6. All responses are followed by a < CR > and < LF > (EOI asserted wi[...]

Remote Operation 68 Order of Execution When you send a set of instructions to the power supply, they are executed in the order in which they are received. The power supply completes the execution of the present command before executing another command. To send more than one command within the power supply command string, use a semicolon to separate[...]

Remote Operation 69 Voltage Programming To program voltage, send the output channel and the programmed value. In the example below, output 1 is programmed to 5 V. VSET 1,5 The values you send must always be volts. For example if you want to program 450 millivolts, convert to volts and then send the command: VSET 1 ,.45 If the output channel is oper[...]

Remote Operation 70 Table 5-4. Programmable Output Ranges for the HP 662lA-6624A and 6627A Supplies Model Output Channel Operating Range * Output Voltage (Avg. Resolution) Output Current-(Avg. Resolution) ** Overvoltage Range(Avg. Resolution 6621A 1 & 2 Low 0 to 7.07 V 0.13 to 10.30 A 0 to 23 V (80 W Low V) High 0 to 20.2 V 0.13 to 4.12 A (0.10[...]

Remote Operation 71 Example 2: VSET 1,20 Now output 1 is in the high range programmed to 20 V and 2A. Example 3: VSET 1,5 ; ISET 1,3 Output 1 is now in the low range programmed to 5 V and 3A. Example 4: VSET 1,10 Now output 1 is in the high range and the current is automatically scaled back from 3 A to the lower current limit of 2.06 A. The output [...]

Remote Operation 72 To enable an output after it went into overvoltage, you must first remove the overvoltage condition and then send the OV reset command. To reset output 1 send: OVRST 1 If you send the reset command without first removing the OV condition, the supply will fire the OV again. NOTE If the programmable OV fails, the supply has a fixe[...]

Remote Operation 73 At power-on, each of the registers contain 0 volts and the minimum current limit. To store voltage and current settings, you must specify the register (1 to 10). For example to store the present settings of current and voltage of all your supply's outputs in register 2, send the following command: STO 2 This command will ta[...]

Remote Operation 74 Figure 5-3. Functional Relationship of Status Registers The supply has one serial poll register which services all outputs and provides the user with other power supply status- related information as discussed on page 75. Status Register . Each output channel of the power supply maintains its present status in an 8-bit register.[...]

Remote Operation 75 The Mask and Fault Register. The fault register works in conjunction with the mask register. These are two eight bit registers which report any fault condition on a particular output channel. The mask register is used to set up the conditions that generate a fault which is latched into the fault register. The user can then read [...]

Remote Operation 76 The first four bits (0 to 3) in the register tell whether or not a particular output has a fault. If there is a fault in one of the outputs, then the corresponding FAU bit will be set. Thus if output 1 has a fault, then FAU 1 will be set. In models with only three outputs, FAU 4 will always be zero and in two output models, FAU [...]

Remote Operation 77 Service Request Enable/Disable . You can query the status of the service request enable/disable function by sending the query: SRQ? and addressing the power supply to talk. The response from the supply is one of the following: 0, 1, 2, or 3 0--indicates that the service request capability (except for power-on; see The Power On-S[...]

Remote Operation 78 Table 5-7 summarizes all the conditions under which a service request will be generated. Table 5-7 Condition for Generating a Service Request Condition Commands Sent State of PON SRQ RQS Bit • Any 0 0 0 • Power-on 1 - 1 • Error - 2 or 3 1 • Fault - 1 or 3 1 Reprogramming Delay The power supply may switch modes or become [...]

Remote Operation 79 DSP 1 You can also find out the status of the display by sending the following query and addressing the supply to talk: DSP? The response will be either a "1'' or a "0''. Message Display Capability . The display command can also be used to display messages on the front panel. Messages may consist of[...]

Remote Operation 80 The supply will respond with a ''1" which indicates that CMODE is on or a "0" which indicates that CMODE is off. DCPON. The DCPON command sets the state of all outputs at power-on. You can specify if the outputs wake up enabled or disabled when the unit is turned on. To enable all outputs at turn-on send[...]

Remote Operation 81 HARDWARE ERR 10 An output error has occurred in an unknown output. Service is required. HDW ERR CH 1 11 Errors 11 through 14 refer to a specific output where there is an output error. Service is required. HDW ERR CH 2 12 Same as in Error #11 HDW ERR CH 3 13 Same as in Error #11 HDW ERR CH 4 14 Same as in Error #11 NO MODEL NUM 1[...]

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Local Operation 83 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 the checkout procedures that were given in that chapter. The following paragraphs describe how to use all of the front panel controls and indicators. Most of the remote operat[...]

Local Operation 84 Figure 6-1. Front Panel (Model 6624A shown) Pressing the ENTER key will enter the values displayed for the function indicated, initiate that function, and return the display to the metering mode in which the measured output voltage and current for the selected output are displayed. Pressing the ENTER key without entering numbers [...]

Local Operation 85 Enabling/Disabling an Output The selected output channel can be turned on and off from the front panel. The OUTPUT ON/OFF key toggles the selected output on and off. When an output is turned off, the message ''DISABLED" will be displayed. The OUTPUT ON/OFF key will not affect any other programmed functions nor will[...]

Local Operation 86 Table 6-1. Bit Arrangement of the Status, Mask, and Fault Registers Bit Position 76543210 Bit Weight 128 64 32 16 8 4 2 1 Condition CP OC UNR OT OV -CC +CC CV Note that bits can be set in an output's fault register only when there is a change in either the status register or the mask register. Therefore, if a bit is set in t[...]

Local Operation 87 ADDR The supply's present address will appear in the display. Address 5 is the factory set address. If you want to leave the address set at 5, you can return to the metering mode by pressing the METER key or you can press another function key. If you want to change the address, you can enter a new value. Any integer from 0 t[...]

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Calibration Procedures 89 A Calibration Procedures Introduction This appendix discusses the software calibration procedures for the power supply. These supplies should be calibrated annually or whenever certain repairs are made (see Service Manual). Because there are no internal or external hardware adjustments, your power supply can be calibrated [...]

Calibration Procedures 90 Figure A-1. Calibration Setup[...]

Calibration Procedures 91 Table A-1. Calibration Commands Command Header Channel* Range Data Syntax (see Figure 5-2) Calibration Mode CMODE 0,1 ( off,on) C2 Set High Voltage VHI 1,2,3,4 - C3 Set Low Voltage VLO 1,2,3,4 - C3 Set High Current IHI 1,2,3,4 - C3 Set Low Current ILO 1,2,3,4 - C3 Calibrate Overvoltage OVCAL 1,2,3,4 - C3 Voltage Data VDATA[...]

Calibration Procedures 92 NOTE Do not turn the power supply off during the calibration procedures. Otherwise, the correction constants are not stored. Exercise care when moving the leads. 1. CM ODE < param > - This command turns the calibration mode either on or off. The parameter must be either a 1 or a 0. CMODE1 is used in the beginning of [...]

Calibration Procedures 93 Repeat commands two through eight for any other outputs that must be calibrated on your power supply. After you have completed calibration of all outputs, turn the calibration mode off by sending the CMODE0 command (see step 1) to the power supply. The correction constants are stored in memory at this time. Calibration Pro[...]

Calibration Procedures 94 450 ! 460 OUTPUT @ Ps;''IDATA" ;Chan,Ilo,Ihi 470 ! 480 IF FNPs _ err < >0 THEN Finish 490 ! 500 OUTPUT @ Ps;"VSET " ;Chan,"0 ;ISET '';Chan,"0" 510 ! 520 INPUT "ANY MORE OUTPUTS TO CALIBRATE? (Y OR N)" ,X$ 530 IF (X$=''Y" OR X$=''y&qu[...]

Calibration Procedures 95 LINE 300: Instructs the power supply to perform an overvoltage calibration on the specified channel. LINE 310--330: Displays a message on the computer until bit 4 (RDY) of the power supply's serial poll register indicates that the supply is finished processing the OVCAL command. This may take up to 10 seconds. LINE 35[...]

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Programming with a Series 200/300 Computer 97 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 200/300 computer using the HP extended BASIC language. Examples are included that employ some of the most frequently used functions. Th[...]

Programming with a Series 200/300 Computer 98 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 [...]

Programming with a Series 200/300 Computer 99 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 = " ;Is1 80 END Line 10: Assigns [...]

Programming with a Series 200/300 Computer 100 a serial poll to determine on which output the overvoltage occurred. Note that this example assumes that terminal block external OV trip lines are not wired together. 10 ASSIGN @Ps TO 705 20 COM /Ps/ @Ps 30 OUTPUT @Ps;''CLR ;UNMASK1,8;UNMASK2,8;SRQ1'' 40 ON INTR 7,1 CALL Err _ trap [...]

Programming with a Series 200/300 Computer 101 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. The foll[...]

Programming with a Series 200/300 Computer 102 LINE 10: Assigns the I/O path name to the power supply. LINE 20: Declare a common block for the I/O path name. LINE 30: Define interrupt on softkey depression and branch to error routine. LINE 40: Idle on softkey definition. LINE 80: Define subprogram Err_trap LINE 90: Disable interrupt capability whil[...]

Programming with a Series 200/300 Computer 103 CC Operation Programming for CC operation is straightforward. Program each output to the desired voltage limit point. Then program each output to supply half of the total desired operating current. Both outputs will operate in CC mode. Note that the total desired current cannot exceed the combined curr[...]

Programming with a Series 200/300 Computer 104 LINE 10: Assigns the I/O pathname to the power supply. LINE 20,30: Enter the operating voltage and current limit point. LINE 40: Sets C equal to one half of the current limit point. LINE 50-70: Determines the voltage setting for output 2. It is 20.2 V when the operating voltage is greater than 7 V, 7.0[...]

Command Summary 105 C Command Summary Introduction Table C-1 provides an alphabetical listing and a brief description of each command that can be sent to the HP 6621A- 24A, and 6627A power supplies. All of the commands can be executed remotely over the HP-IB. Many of the commands can also be executed locally from the supply's front panel as in[...]

Command Summary 106 Table C-l. Command Summary (continued) Command Description DSP? Queries the present status of the display (see page 78). Response is either a 1 (on) or a 0 (off). DSP " xxxxxxxxxxxx ” Puts the quoted string on the power supply's front panel display (see page 79). Only numerals, upper case letters, and spaces are allo[...]

Command Summary 107 Table C-l. Command Summary (continued) Command Description OCP? < ch > Queries the overcurrent protection circuit on/off status for the specified output channel (see page 72). Response is either a 1 (on) or a 0 (off). The OCP ENBLD annunciator on the front panel displays the on/off status of the OCP circuit for the selecte[...]

Command Summary 108 Table C-l. Command Summary (continued) Command Description SRQ? Queries the present setting of the reasons for issuing an SRQ (see page 76). Response is 0, 1, 2, or 3 that corresponds with the SRQ <setting> described previously. *STO < reg > Stores the present voltage and current settings for all output channels in t[...]

Error Codes and Messages 109 D Error Codes and Messages Introduction This appendix describes the HP-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 cat[...]

Error Codes and Messages 110 Table D-2. ERROR Responses Error Code (ERR? query) Message (ERR key) Explanation 0 NO ERROR Indicates there are no errors. 1 INVALID CHAR You sent the supply a character it did not recognize. 2 INVALID NUM The format of your number is incorrect. Check syntax (see Chapter 5). 3 or 28 INVALID STR You sent a command the su[...]

Error Codes and Messages 111 Table D-2. ERROR Responses (continued) Error Code (ERR? query) Message (ERR key) Explanation 17 UNCALIBRATED Unexplained EEPROM error ; possibly as the result of incorrect calibration procedure. Recalibrate as described in Appendix A. If the problem persists , a hardware failure exists (Refer to the Troubleshooting Sect[...]

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Manual Backdating 113 E Manual Backdating Introduction The backdating information in this section applies to units that have the following serial numbers: HP Model 6621A serials 2611A-00101 to 01680 HP Model 6622A serials 2611A-00101 to 02090 HP Model 6623A serials 2611A-00101 to 02230 HP Model 6624A serials 2550A-00101 to 06720 HP Model 6627A seri[...]

Addendum 114 ADDENDUM I. Generally Applicable Annotations Consistent with good engineering practice, leads attached to customer accessible signal/monitoring ports (such as the l0-pin Control Connector, the 7-pin Analog Connector, the 7-pin Digital Port/Trigger Connector, screw terminal Barrier Blocks, etc.) should be twisted and shielded to maintai[...]

HP Sales and Support Office 115 HP Sales and Support Office For more information, call your local HP Sales Office listed in the telephone directory white pages. Ask for the Electronic Instruments Department. Or contact: United States: Hewlett-Packard Company 4 Choke Cherry Road Rockville, MD 20850 (301) 6704300 Hewlett-Packard Company 5201 Tollview[...]