Keysight Technologies N6700 User Manual

Also see for N6700: User guide

Contents

Keysight Technologies N6700 User Manual Manual pdf 87 page image

Operating the Power System 4Keysight N6700 User’s Guide 87Using the Protection FunctionsEach output has independent protection functions. A front panel statusindicator will turn on when a protection function has been set. Protectionfunctions are latching, which means that they must be cleared once theyhave been set. As explained under “Couple Output Protection” you canconfigure the instrument so that when a protection fault occurs on oneoutput, ALL outputs will be turned off.Of the following protection functions, only OV, OV-, OC, OSC, PROT, andINH are user- programmable.OV Over-voltage protection is a hardware OVP whose trip level is a programmable value. TheOVP is always enabled.OV− Negative voltage protection is a hardware OVP. Only applies to Keysight N678xA SMU andN6783A.OC Over-current protection is a programmable function that can be enabled or disabled.When enabled, the output will be disabled when the output current teaches the currentlimit setting.OT Over-temperature protection monitors the temperature of each output and shuts down theoutput if any temperature exceeds the maximum factory-defined limits.OSC Oscillation protection shuts down the output if an oscillation is detected on the output.Only applies to Keysight N678xA SMU.PF PF indicates that a power fail condition on the AC mains has disabled the output.CP+ CP+ indicates that a positive power limit condition has disabled the output. This protectionfunction does not apply to all power modules. Refer to Appendix C for further information.CP− CP− indicates that a negative power limit condition has disabled the output. Thisprotection function does not apply to all power modules. Refer to Appendix C for furtherinformation.PROT Prot indicates that the output is disabled, either because of a coupled protection signalfrom another output, or because the programmed output watchdog time has expired.INH The Inhibit input (pin 3) on the rear panel digital connector can be programmed to act asan external shutdown signal. Refer to Appendix B for further information.Set the Over-Voltage ProtectionThe over-voltage protection function turns off the affected output if theoutput voltage reaches the programmed over-voltage limit. The OVPcircuit monitors the voltage at the + and – output terminals. However, onKeysight Models N678xA SMU and units with Option J01, the voltage ismonitored at the + and – sense terminals. This allows for more preciseover-voltage monitoring directly at the load.Units with Option J01 have tracking OVP in addition to the standardovervoltage protection. It lets you set an overvoltage protection limit thatis offset from the programmed voltage. The tracking OVP thresholdautomatically tracks the real time programmed settings. Option J01 isonly available on models N6752A, N6754A and N6762A.