Module S
protect
resistor
MP4361A , MP4362A 1.6 kΩ
Open Sense Leads
The sense leads are part of the output's feedback path. Connect them in such a way so that they do not
inadvertently become open circuited. The power system includes protection resistors that reduce the
effect of open sense leads during remote-sensing operation. If the sense leads open during operation,
the power system returns to the local sensing mode, with the voltage at the output terminals
approximately 1% higher than the programmed value.
Over-Voltage Protection Considerations
You must take into account any voltage drop in the load leads when setting the over-voltage trip point.
This is because the OVP circuit senses at the output terminals and not at the sense terminals. Due to
the voltage drop in the load leads, the voltage sensed by the OVP circuit could be higher than the
voltage being regulated at the load.
Output Noise Considerations
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 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 system
end only; do not use the shield as one of the sensing conductors.
The documented noise specifications apply at the output terminals when using local sensing. However,
voltage transients may be produced at the load by noise induced in the leads or by load current
transients acting on the inductance and resistance of the load lead. If it is desirable to keep voltage
transient levels to a minimum, place an aluminum or tantalum capacitor, with an approximate value of
10 µF per foot (30.5 cm) of load lead, right across the load.
Keysight MP4300 Series Operating and Service Guide 49
2 Installing the Instrument
To Next Page
Loading...
Need help?
General
