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 Program

The following calibration program can be used as is, provided you have an HP Series 200 computer with the BASIC programming language and an HP 3456A voltmeter. The calibration program is written with the assumption that your power supply is at address 705 and the voltmeter is at address 722. The program will ask you which output is to be calibrated and will prompt you to make the voltage and current calibration connections shown in Figure A-1.

10 ! CALIBRATION EXAMPLE

20 !

30ASSIGN @Ps TO 705

40ASSIGN @Vm TO 722

50COM /lnstr/ @Ps,@Vm

60

Shunt_resistor=.1

70

!

80OUTPUT @Ps;"CLR"

90OUTPUT @Vm;"H T4"

100TRIGGER 722

110

ENTER @Vm;Temp

! CLEAR VOLTMETER OUTPUT BUFFER

120OUTPUT @Ps;"CMODE 1"

130!

140Start_loop: ! LOOP TO HERE FOR ADDITIONAL OUTPUTS

150!

160INPUT "ENTER OUTPUT CHANNEL TO BE CALIBRATED (1,2,3,or 4)'',Chan

170DISP ''SET UP OUTPUT ";Chan;" FOR VOLTAGE CALIBRATION & PRESS CONTINUE''

180PAUSE

190!

200OUTPUT @Ps;''VHI'';Chan

210Vhi = FNDvm

220!

230OUTPUT @Ps;"VLO";Chan

240Vlo = FNDvm

250!

260OUTPUT @Ps;''VDATA";Chan,Vlo,Vhi

270!

280IF FNPs _ err< >0 THEN Finish

290!

300OUTPUT @Ps;"OVCAL";Chan

310REPEAT

320DISP "WAITING FOR OVERVOLTAGE CALIBRATION"

330UNTIL BlT(SPOLL(@Ps),4)

340!

350IF FNPs _ err < > 0 THEN Finish

360!

370DISP ''SET UP OUTPUT ";Chan;" FOR CURRENT CALIBRATION & PRESS CONTINUE"

380PAUSE

390!

400OUTPUT @Ps;''IHI";Chan

410Ihi = FNDvm/Shunt _ resistor

420!

430OUTPUT @Ps;"ILO";Chan

440Ilo = FNDvm/Shunt _ resistor

Calibration Procedures 93

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HP 6623A, 6624A, 6621A manual Calibration Program, 10 ! Calibration Example, Clear Voltmeter Output Buffer, Pause

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.