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3 Using the Source/Load Functions
Configuring Protection
Protection functions are configured in the Protection Configuration window. Press the Settings key to
access the Source Settings window. Navigate to and select Protection. Then press Enter.
Over-Voltage Protection - Over-voltage protection disables the output if the output voltage reaches
the OVP level. The OVP circuit monitors the voltage at the + and – output terminals. To set the over-
voltage protection, enter an over-voltage value in the +Level field.
For models N678xA SMU
, the OVP circuit senses at the 4-wire sense terminals rather
than at the output terminals. This allows for more precise over-voltage monitoring directly at the load.
Refer to
Over-Voltage Protection Considerations
for details. These models also have a back-up local
OVP function. Refer to
Local OVP
for a description of the feature. Additionally, for model N6784A, you
can program a negative over-voltage value. Enter the value in the -Level field.
For models N678xA SMU and N6783A
, you can specify a delay to prevent
momentary voltage excursions from tripping the over-voltage protection. Enter the value in the over-
voltage Delay field. These models also have negative voltage protection, which disables the output if
negative voltages are detected. Negative voltage protection is indicated by the OV- annunciator.
For models N679xA
the over-voltage protection level is not programmable and is fixed at
110% of the rated input voltage. These models also have reverse voltage protection. You can specify if
reverse voltages will disable the input terminals. Reverse voltage protection is indicated by the OV-
annunciator.
Over-Current Protection - With over-current protection enabled, the power analyzer disables the
output if the output current reaches the current limit setting, which causes a transition from CV to CC
mode. To enable over-current protection, check the Enable OCP box.
Note that you can also specify a Delay to prevent momentary CV-to-CC status changes from tripping
the over-current protection. The delay can be programmed from 0 to 0.255 seconds. You can specify if
the Start of the delay is initiated by any transition into CC mode, or only at the end of a settings change
in voltage, current, or output state. Refer to
CC Mode Delay
for more information.
Models N679xA
have an additional fixed over-current protection that is always enabled.
This protection will turn the output off whenever the input current exceeds 105% of the high ranges
and approximately 110% of the low current ranges.
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Keysight N6705C User's Guide
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