voltage limit) or LIM- (negative voltage limit) status flag is set to indicate that either the positive or
negative voltage limit has been reached.
As shown by the horizontal portions of the load line, when the unit is sinking power, the output current
may continue to increase in the positive or negative direction as more current is forced into the unit.
Once the current is exceeds 112% of the rated current of the range, the output will shut down, the
output relays will open, and the OC and PROT status bits will be set.
N678xA Output Bandwidth
Keysight Models N678xA SMU have several voltage bandwidth modes that let you optimize output
response time with capacitive loads.
The Low bandwidth setting provides stability with a wide range of load capacitors. Additional
bandwidth modes provide faster output response when the load capacitance is restricted to smaller
ranges.
If capacitive loads cause the output to oscillate on the default (Low bandwidth) or any of the other
bandwidth settings, a protection function will detect the oscillation and latch the output off. The
condition is annunciated by the OSC status bit. At power-on the oscillation protection function is
enabled.
From the front panel:
Press the Settings key to access the Source Settings window. Navigate to and select Advanced.
Select a bandwidth according to the following load capacitances and load lead lengths:
Setting Load Capacitance Sensing Maximum distance from sense point
to load capacitor
ESR @100 kHz
Low 0–150 μF Local or remote Full lead length
50 to 200 mΩ
High1 0–1 μF Remote only 6 inches (15 cm)
50 to 200 mΩ
High2 0–7 μF Remote only 6 inches (15 cm)
50 to 200 mΩ
High3 7–150 μF Remote only 6 inches (15 cm)
50 to 200 mΩ
Refer to Keysight N678xA SMU Wiring for information on allowable full lead lengths.
6 Advanced Source, Measurement, and Control
198 Keysight N6705C Operating and Service Guide
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