Programming Output Protection
Clear Output Protection
Introduction
Keysight MPS models have many protection functions. These functions disable the channel output to
protect the device under test (DUT) as well as the channel. A front panel status indicator will turn on
when a protection function has been set. Most protection functions are latching, which means that
they must be cleared once they have been set.
All protections cause a high impedance output disconnect. The output is disconnected
without actively sinking current, so any voltage discharge of the DUT depends on the
DUT characteristics. The DUT and load lead inductance must be within the specified
hardware limits to safely absorb any stored energy. Refer to the Specifications for more
information.
Of the following protection functions, the OV, OC, PROT and INH are user-programmable.
OV = Over-voltage protection compares the voltage measured by the sense leads to the user-
programmed positive OVP level. If the sense voltage exceeds this level the channel goes into a latched
protection state. OV protection is always enabled.
OV- = Negative over-voltage protection trips if the remote sense leads are accidentally reversed. This
protection minimizes the resulting rise in output voltage by comparing the voltage measured by the
sense leads to a fixed negative voltage level of 20% of the unit's rated voltage. If the sense voltage
exceeds this level the unit goes into a latched protection state. OV- protection is always enabled.
OC = Over-current protection can be enabled or disabled. When enabled, the channel goes into a
latched protection state when the output current reaches the current limit setting. This prevents
persistent operation in current limit when operating in voltage priority mode.
OC- = Same as OC, except that it protects against negative over-current.
OP+ = Positive over-power protection compares the output power to the rated sourcing power. A OP+
protection occurs when the rated power threshold is exceeded. OP+ protection is always enabled.
OP- = Negative over-power protection compares the sinking power to the rated sinking power. A OP-
protection occurs when the rated power threshold is exceeded. OP- protection is always enabled.
OT = Over-temperature protection monitors a number of internal temperatures and compares them to
pre-defined temperature limits. If an internal temperature exceeds the pre-defined limit, the channel
goes into a latched protection state. Use OUTP:PROT:OT:AMB:MARG? to return the margin remaining
between the temperature reading and the OT trip level. OT protection is always enabled.
Note that If an over-temperature condition occurs on the ac input converter of the instrument, the unit
will shut down immediately without warning and will not generate an OT status.
4 Using the Modular Power System
86 Keysight MP4300 Series Operating and Service Guide
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