Assessments - 4, GPA: 4.3 ( )

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Setting the Supply’s GP-IB Address As described in page 40, before you can operate the supply remotely, you must know its GP-IB address. You can find this out locally from the front panel by pressing: 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 through 30 can be selected. 88 Local Operation For example, you can change the address of your supply to 10 by pressing: ADDR 1 0 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. The power supply will return the error message to the display and clear the error bit. For example, if you program a number that is not within the valid range, the ERR annunciator will come on. You can display the error message by pressing the ERR key. In this case, the error message "NUMBER RANGE" will be displayed. Errors generated either locally from the front panel or remotely from the GP-IB computer can be displayed by pressing the ERR key only when the supply is in the local mode. Pressing the ERR key also clears the error bit so if you press ERR again, the message "NO ERROR" will appear. All error codes and associated display messages are listed in Table 5-8. Storing and Recalling Voltage and Current Settings for All Outputs As described on page 75, the power supply has 11 internal registers for storing voltage and current settings of all outputs. At power on each location contains zero volts and the minimum current limit (see initial conditions on page 71). The STO and RCL keys allow you to store and recall voltage and current settings for all your output channels from any of the 11 internal registers (numbered 0 through 10). For example, you can store the present settings of voltage and current for all the output channels in internal register 2 by pressing: STO 2 ENTER You can change the settings of any of your supply’s outputs any number of times as required and then program them to the settings stored in internal register 2 by pressing; RCL 2 ENTER The internal registers 0-3 will retain the settings when power is turned off. When power is turned off and then on again, registers 4-10 will be reset to zero voltage and the current to 10 mA. Register 0 is the power on state. The power will be programmed from values in register 0 at power on. The advantages in using the internal registers are that command processing time is saved and repetitive programming of different settings is simplified. The STO key can be used in conjunction with the OUTPUT ON/OFF key to store settings while the outputs are disabled (OFF). These stored settings can be used later to program the outputs to the stored settings using the RCL and OUTPUT ON/OFF keys. Local Operation 89 A 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. Refer to Appendix C (Command Summary) for detailed explanations of the commands used within the alignment program. Because there are no internal or external hardware adjustments, your power supply can be aligned without removing the covers or removing it from the cabinet if it is rack mounted. Alignment is performed by measuring actual output values and sending them to the supply over the GP-IB. Security against accidental alignment is available. A jumper inside the unit may be moved from NORMAL to CAL LOCKOUT to disable all alignment commands. Access to this jumper requires opening the unit (see Service Manual). If a number returned to the power supply is out of range while running the alignment program, the front panel ERR annunciator will indicate an error. For example, an error will be created if the DMM is connected to measure a current when a voltage measurement is anticipated by the program. Note The memory used to store correction constants will accept and store data about 10,000 times, which is more than sufficient for normal calibrations over the life of the instrument. However, do not put the unit in a calibration loop that repeatedly turns the calibration mode on and off. Test Equipment and Setup Required The following test equipment is required for alignment: 1. A computer connected to the GP-IB connector on the back of the power supply. 2. An Agilent 3458A Digital Multimeter (DMM). 3. A precision 0.1 ...

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