Introduction - Keysight Technologies RP7900 Serie Guide D'utilisation Et De Maintenance

4 Using the Regenerative Power System
Programming Output Protection
Set the Over-Voltage Protection
Set the Over-Current Protection
Output Watchdog Timer
Set the Under-Voltage Protection
Clear Output Protection

Introduction

The RPS models have many protection functions. These functions disable the output to protect the
device under test (DUT), as well as the power supply. 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 the DUT's voltage discharge depends on its
characteristics. The DUT and load lead inductance must be within the specified
hardware limits to safely absorb any stored energy. Refer to the Maximum Load
Inductance limits under
Of the following protection functions, the OV, OC, PROT, INH, and UV are user-programmable.
OV Over-voltage protection is a hardware protection whose trip level is user-programmable. OV
protection occurs automatically if the remote sense leads are shorted. OV protection is always
enabled.
OV- Negative over-voltage protection trips if the remote sense leads are reversed. At turn-on, it also
trips if voltages more negative than -5V for models
models are present at the output terminals. After turn-on the level increases to -20%
for models RP793xA and RP794xA. OV- protection is not programmable and is always enabled.
OC Over-current protection is a user-programmable function that can be enabled or disabled. When
enabled, the output will be disabled when the output reaches the current limit setting. An OCP also
occurs if internal current limitations are exceeded regardless of the OCP setting.
CP+ Positive over-power compares the output power against a built-in threshold. A CP+ protection
occurs when the threshold is exceeded. CP+ protection is always enabled.
CP- Negative over-power compares the internally dissipated power against a built-in threshold. A
CP- protection occurs when the threshold is exceeded. CP- protection is always enabled.
OT Over-temperature protection monitors the internal temperature of the power supply and disables
the output if the temperature exceeds the pre-defined limit (see
OUTPut:PROTection:TEMPerature:MARGin?). OT protection is always enabled.
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RP793xA, RP794xA characteristics.
Keysight RP7900 Series Operating and Service Guide
, or -1% of the rated output for