Positive, Negative, and Floating VoltagesEither positive or negative voltages with respect to ground can be obtained from the output bygrounding (or "commoning") one of the output terminals. Always use two wires to connect the load tothe output regardless of where or how the system is grounded.l 20 V models can operate with any output terminal ± 60 VDC including output voltage from ground.l 80 V and 160 V models can operate with any output terminal ± 240 VDC including output voltagefrom ground.l 500 V and 950 V models can operate with any output terminal ± 950 VDC including output voltagefrom ground.The RPS models are optimized for grounding the negative output terminal. Groundingthe positive terminal may result in increased current measurement noise and areduction in current measurement accuracy.Additional Load Considerations - RP793xA, RP794xAThis information applies to models RP793xA and RP794xA only.Load Inductance LimitationsEQUIPMENT DAMAGE The instrument's internal voltage clamps are susceptible tothermal damage when the output is abruptly turned off at full load current if the leadinductance exceeds the model-dependent Maximum Load Inductance characteristic.As a wire inductance reference point, a single pair of load leads typically yields between 500 nH to 1μH per meter of paired length (round trip), depending on the gauge of wire, thickness of insulation, andmechanical coupling of the leads. To attain greater lead lengths, wire inductance can be minimized byparalleling additional bundled sets of load leads or using specialized low inductance wiring.Load Capacitance and Lead Inductance Considerations in Voltage Priority ModeFor operation of the RPS units in voltage priority mode, the setup typically resembles that in thefollowing figure where the DUT is of a resistive or high impedance nature and may have some localbypass capacitance near its own terminals. Remote sensing at the DUT terminals is recommended ifaccurate DC voltage regulation is required.Keysight RP7900 Series Operating and Service Guide 752 Installing the Instrument
