HP 6621A, 6623A Local Control Of System Functions, Condition, Setting the Reprogramming Delay

Page 86

Table 6-1. Bit Arrangement of the Status, Mask, and Fault Registers

Bit Position

7

6

5

4

3

2

1

0

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 the mask register (unmasked) while the corresponding condition is true in the status register, the associated bit will also be set in the fault register.

The UNMASK key is used to send a decimal number that is the sum of the weights of the bits to be set. The decimal number 0 will clear all bits in the mask register so that status register bits cannot set any of the corresponding fault register bits.

The following example uses the number 9 (8 + 1) to set the OV bit (8) and the CV bit (1) in the mask register of the selected output.

UNMASK

9

ENTER

This example allows only an OV and/or CV condition to appear as faults; i.e., set the corresponding bits in the fault register. Note that the mask register does not affect the status register; it simply determines which bits in the status register can set bits in the fault register.

When you press the FAULT key, the contents of the fault register are displayed. For example, the display 9 indicates that the OV and CV bits in the fault register are set. The fault register is cleared immediately after it is reset by pressing

FAULT.

Setting the Reprogramming Delay

A power supply's output may switch modes momentarily after a new output value is programmed or the output is reset from zero. To prevent these momentary conditions from appearing as faults, each output has a reprogramming delay parameter. The delay parameter specifies a time period in which the CV, + CC, - CC, and UNR bits in the present status register are masked from the fault register and from the overcurrent protection (OCP) circuit after certain commands are sent. Refer to Reprogramming Delay, page 78, for additional details about the reprogramming delay parameter.

The delay time is initiated following a VSET, ISET, OVRST, OCRST, OUT on/off, or RCL command that is sent from the front panel (or from a remote controller).

The delay time is settable from 0 to 32 seconds in .004 s (4 ms) intervals. The default (or power on value) is 20 ms.

For example, set the delay time of the selected output to 345 mS by pressing:

DLY

.

3

4

5

ENTER

Local Control Of System Functions

The System Function keys consist of the ADDR, ERR, STO, and RCL keys as shown in Figure 6-1. These keys are independent of the output selected and are used in setting the supply's HP-IB address, displaying error messages, and storing/recalling voltage and current settings for all of the supply's output channels.

Setting the Supply's HP-IB Address

As described on page 39 before you can operate the supply remotely, you must know its HP-IB address. You can find this out locally from the front panel by pressing:

86 Local Operation

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Contents Operating Manual HP Part NoCertification Safety Summary Safety Summary Symbol DescriptionDeclaration of Conformity EMCAppendix C--Command Summary Installation ProceduresAppendix A--Calibration Procedure Appendix D--Error MessagesTable Of Contents Remote Operation Local OperationCalibration Command SummaryError Messages Programming With The Series 200/300 ComputerPage Introduction Safety ConsiderationsGeneral Information Instrument and Manual IdentificationOutput Combinations Available Model AccessoriesDescription HP-IB Board Basic OperationOutput Low Range Values High Range Values Output Boards Definitions SpecificationsQualifying Conditions Output Response Characteristics Specifications Source EffectSupplemental Characteristics Outputs Low High Voltage Temperature CoefficientAC Input Power and Current Outputs Low High Voltage Programming ResolutionReadback Resolution Command Processing Time see FigureOutput Impedance Safety Agency ComplianceDimensions all models Low Voltage High Voltage 80 W Low VoltageGeneral Information General Information General Information General Information Location and Cooling InstallationInitial Inspection Input Power Requirements Line FuseLine Fuses 100/120 2110-0342 220/240 2110-0055Power Cord Line Voltage ConversionHP-IB Interface Connector Page Turning On Your Supply Front Panel Controls and IndicatorsGetting Started LCL key HP-IB Status AnnunciatorsAlphanumeric LCD Power Supply StatusAnnunciators System Control KeysOutput Control Keys Normal Self Test Indications Line SwitchNumeric Entry Keys Checking Out Your Supply Using Local Control Sample Self-Test Failure DisplayCurrent Test Voltage TestOvervoltage Test OCP Introduction To Remote OperationIset Enter Enter/Output StatementsReading the HP-IB Address Sending a Remote CommandOutput AddrDisp a Often Used CommandsGetting Data From The Supply Disp a Returning the Supply to Local Mode Output Connections and Operating Information Output RangesRange Selection Protection FeaturesOperating Quadrants Typical Output Range Characteristics Connecting the Load Page Cross Section Meters Area in mm2 Wire Bundled 10 a 20 aFeet Positive and Negative Voltages Remote Voltage SensingMultiple Loads Remote Voltage Sensing Remote Sense ConnectionsProgramming Response Time with an Output Capacitor Output Type FormulaOutput Noise Considerations Open Sense LeadsOvervoltage Trigger Connections External Trigger CircuitEquivalent Internal OV Trigger Circuit Parallel Operation Power Supply Protection ConsiderationsBattery Charging Maximum Allowable Voltage Setting CV OperationCC Operation Remote SensingSeries Operation 13. Series Connections with Local Sensing CV OperationSpecifications for Series Operation 14. Series Connections with Remote SensingPage Page Interface Function Remote OperationHP-IB Operation HP-IB Address Selection Numeric Data Power-On Service Request PONProgramming Syntax Sheet 1 of 2. Syntax Forms for Power Supply Commands Sheet 2 of 2. Syntax Forms for Power Supply Commands Iset Fault ?Vset OvsetPage Power Supply Commands Initial ConditionsVoltage Programming Current ProgrammingRange Switching OVSET? Output On/OffOvervoltage OV Protection Overcurrent Protection OCP Multiple Output Storage & RecallClear Command Status ReportingUNR +CC ASTS?Unmask 2,XXX FAULT?UNMASK? Bit Assignment of the Serial Poll RegisterService Request Generation SRQ? PON ?Display On/Off Reprogramming DelayRQS Bit Other Queries Response Code Front PanelExplanation TEST? Responses Code ExplanationPage Local Control Of Output Functions Local ModeLocal Operation GeneralSetting Voltage Setting CurrentResetting Overcurrent Protection Setting Overvoltage ProtectionResetting Overvoltage Protection Displaying the Contents of the Fault RegisterLocal Control Of System Functions Setting the Reprogramming DelaySetting the Supplys HP-IB Address ConditionSTO Enter Displaying Error MessagesAddr Enter RCL EnterPage Calibration Procedures Test Equipment and Setup RequiredFigure A-1. Calibration Setup General Calibration Procedure Are not stored. Exercise care when moving the leads Clear Voltmeter Output Buffer Calibration Program10 ! Calibration Example PauseFnend Input ANY More Outputs to CALIBRATE? Y or N,X$Disp END of Calibration Program Page Page Voltage and Current Programming Programming With a Series 200/300 ComputerPath Names Voltage and Current Programming With Variables Voltage and Current ReadbackService Request and Serial Poll Programming Power Supply RegistersPrint OUTPUT1 is in CV Mode END if Present StatusPrint Overvoltage on Output #1 Enable IntrOFF Intr Print Overvoltage on Output #2Error Detection Programming Outputs Connected In Parallel Stored Operating StatesInput Enter Voltage LIMIT,V Input Enter Operating VOLTAGE,V1Programming Outputs Connected In Series Input Enter the Desired Current Limit POINT,ICommand Description Command SummaryTable C-1. Command Summary Table C-l. Command Summary PON? ROM?Previously Table D-l. Power-On Self Test Error Message Error Codes and MessagesPower-On Self Test Messages Error Responses Test ResponsesTable D-2. Error Responses Error Code Message Explanation ERR? query ERR keyTable D-3. TEST? Responses Response Code Explanation TEST? queryPage Manual Backdating Make Changes6621A Generally Applicable AnnotationsII. CE92 Product Specific Annotations 6623AFar East Or contactEurope Latin America

6624A, 6621A, 6623A specifications

The HP 6623A, 6621A, and 6624A are precision DC power supplies widely recognized for their reliability and performance in various laboratory and industrial applications. These models are part of HP's 662X series, designed to cater to the needs of engineers, researchers, and technicians who require accurate power sources for their testing and development activities.

The main features of the HP 6623A, 6621A, and 6624A include their high stability, low ripple, and excellent load regulation, ensuring that the output voltage and current remain stable during testing. The power supplies provide multiple output channels, allowing users to power multiple devices simultaneously. The flexibility in setting voltage and current levels makes these models ideal for a wide range of applications, including semiconductor testing, device characterization, and system integration.

One of the standout technologies in the HP 662X series is the use of smart design techniques that minimize noise and enhance output performance. These power supplies incorporate advanced feedback mechanisms to maintain steady output, even under varying load conditions. Additionally, they feature programmable outputs, which means users can adjust the output levels through a connected computer or control system, streamlining the testing process and improving efficiency.

The HP 6623A model offers three independent outputs, with total power capabilities of 40 watts. It includes a 0-20V output, which can deliver up to 2A of current, along with two additional outputs that are adjustable. The 6621A provides a single output option, delivering a maximum of 20V and 2A, making it well-suited for simple applications where a single power source is required. In contrast, the HP 6624A stands out with its four independent output channels, providing a total of 60 watts, making it the most versatile of the three models.

Characteristics of these power supplies include user-friendly interfaces, allowing for easy configuration and monitoring of settings. LED indicators provide real-time feedback on voltage and current levels, enabling users to quickly assess the performance of their tests. Moreover, built-in protection features safeguard both the power supply and the connected devices from overvoltage and overcurrent conditions.

Overall, the HP 6623A, 6621A, and 6624A power supplies embody advanced engineering and design, making them invaluable tools for professionals looking for high-quality, reliable power sources for their electronic testing needs.
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