Agilent Technologies N8900 series Operating Manual page 34

Over-voltage Protection
Remote over-voltage protection (OVP) provides a customer-configurable over-voltage protection. When combined with
remote voltage sensing, this allows for more precise voltage protection directly at the load. The OVP circuit monitors the
voltage at the + and – sense terminals if they are connected to the load, or at the output terminals if the sense ter-
minals are not being used. Refer to
Output Noise
Any noise picked up on the sense leads will appear at the output terminals and may adversely affect CV load regulation.
Twist the sense leads or use a ribbon cable to minimize the pickup of external noise. In extremely noisy environments it
may be necessary to shield the sense leads. Ground the shield at the power supply end only; do not use the shield as
one of the sensing conductors.
Positive and Negative Voltages
Either positive or negative voltages with respect to ground can be obtained from the output by grounding (or "com-
moning") one of the output terminals. Always use two wires to connect the load to the output regardless of where or
how the system is grounded.
SHOCK HAZARD The negative DC output of any unit cannot be more than ±300 VDC
with respect to earth ground. This means that you cannot ground the + output ter-
minal of units rated higher than 300 V.
Equipment Damage Before grounding any output terminal, check to see if the load is already
grounded. Incorrect grounding could result in a short circuit.
Agilent N8900 Series Operating and Service Guide
Programming Output Protection
Connections-Single Unit
for further information.
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