13-10 Digital I/O Port, Safety Interlock, and Output Configuration 2400 Series SourceMeter
®
User’s Manual
NOTE When changing the output-off state with the output off, the selected output-off
state will be entered immediately.
On power-up, the SourceMeter will momentarily be in the HIGH IMPEDANCE
output-off state before going to the selected power-on output-off state.
If an Over-Temperature condition or an interlock violation occurs, the Source
Meter will go into the HIGH IMPEDANCE output-off state.
Output-off states and inductive loads
The output-off state you select for inductive loads depends on how much energy the induc-
tor holds. The NORMAL output-off state is not recommended as it lowers the compliance
setting. The ZERO or possibly GUARD state are better suited, as ZERO does not change
the compliance setting and the GUARD output-off state would change the voltage source
to a current source with a voltage compliance. The GUARD state is typically used only for
guarded ohms measurements.
To protect the unit from inductive energy, the application may require a spark gap across
the INPUT HI and LO terminals. The SourceMeter does not have internal spark gap
protection, as some leakage current (nA) is associated with the protection circuits.
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