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10. Press Protect PROT:CLEAR Display accesses the protection menu list. 3 - Turn-On Checkout Procedure Display Explanation 11. Press . or o and scroll VOLT:PROT 500 Display shows the overvoltage protection trip voltage to the VOLT:PROT item for your unit. The overvoltage protection voltage is programmed in peak, not rms volts. 12. Press 1, 6, 0, Enter VOLT:PROT 160 Programs the OVP to 160 Vpeak, the rms value of which is less than the previously set rms voltage. 0 V 60 Hz Because the peak OVP voltage entered was less than the rms output voltage, the OVP circuit tripped. The output dropped to zero, CV turned off, and Prot turned on. 13. Press Protect, scroll to VOLT:PROT 320 Programs the OVP to a peak value that is greater than the VOLT:PROT item, the rms output voltage value. and press 3, 2, 0, Enter Note: You cannot clear an OVP trip until you have first removed the cause of the condition. 14. Press Protect, and 120 V 60 Hz Executes the PROT:CLEAR command, restoring the Enter output. Prot turns off and CV turns on. 15. Press Shift, and CURR:LEV 5 Indicates the default output current limit setting. Current 16. Press . 5 Enter CURR:LEV .5 Sets the current limit to .5 amperes. The CC annunciator is on, indicating that the unit is in current limit mode and the light bulbs are dimmer because the output voltage has dropped in its attempt to limit output current. 17. Press Protect, scroll to CURR:PROT ON You have enabled the overcurrent protection circuit. the CURR:PROT item, The circuit then tripped because of the output short. The and press ° to select ON. CC annunciator turns off and the OCP and Prot Then press Enter. annunciators come on. The output current is near zero. 18. Press Output On/Off 0.5 V 60 Hz The output is off and the Dis annunciator turns on. 19. Press Protect, scroll to CURR:PROT OFF You have disabled the overcurrent protection circuit. the CURR:PROT item, The Prot annunciator turns off. press ° to select OFF, then press Enter. 20. Turn the unit off. The next time the unit turns on it will be restored to the *RST or factory default state Turn-On Checkout - 3 In Case of Trouble Error Messages Ac source failure may occur during power-on selftest or during operation. In either case, the display may show an error message that indicates the reason for the failure. Selftest Errors Pressing the Shift and Error keys will show the error number. Selftest error messages appear as: ERROR , where "n" is a number listed in the following table. If this occurs, turn the power off and then back on to see if the error persists. If the error message persists, the ac source requires service. Table 3-1. Power-On Selftest Errors Error No. Failed Test Error 0 Error 1 Error 2 Error 3 Error 4 Error 5 Error 6 Error 10 Error 11 to 18 No error Non-volatile RAM RD0 section checksum failed Non-volatile RAM CONFIG section checksum failed Non-volatile RAM CAL section checksum failed Non-volatile RAM WAVEFORM section checksum failed Non-volatile RAM STATE section checksum failed Non-volatile RAM LIST section checksum failed RAM selftest DAC selftest 1 to 8 Runtime Error Messages Under unusual operating conditions, the front panel display may show OVLD. This indicates that the output voltage or current is beyond the range of the meter readback circuit. If the front panel display indicates -- -- -- -- -- --, a GPIB measurement is in progress. Appendix C lists other error messages that may appear at runtime. Line Fuse If the ac source appears "dead" with a blank display and the fan not running, first check your power source to be certain line voltage is being supplied to the ac source. If the power source is normal, the ac source line fuse may be defective. If the ac source has a defective fuse, replace it only once. If it fails again, investigate the reason for the failure. Proceed as follows: 1. Turn off the front panel power switch and remove the input power (unplug the power cord or open the safety disconnect). 2. Remove the fuse cover from the rear panel. 3. Unscrew the fuse caps and remove the fuses. 4. If any fuses are defective, replace all three with fuses of the same type (see Chapter 1). 5. Turn on the ac source and check the operation. If it is normal. replace the fuse cover. Maintenance Note: It is recommended that new fuses be installed every four years. Front panel Operation Introduction Here is what you will find in this chapter: . a complete description of the front panel controls . front panel programming examples that describe: · how to program the output voltage and frequency · how to measure the output · how to program the output pulses and lists · how to trigger output changes Front Panel Description Figure 4-1. Front Panel, Overall View 4 - Front Panel Operation j Display 14-character vacuum fluorescent display for showing programmed commands and measured values. k Annunciators Annunciators light to indicate operating modes and status conditions: f1, f2, f3 Phase 1, 2, or 3 is being controlled or metere...

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