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sense signal will light at the right side of the display as shown below. To exit the
configuration session, press any other key to exit.
3.7.1 Constant Voltage Regulation
The constant voltage (CV) regulation specification for load applications applies at the output
terminals of the power supply. Under the Remote Voltage Sense, you have to add 5mV to this
specification for each drop of 1V between the positive load point and + output terminal of the
power supply since the load current is changed. For this potential issue, the lead length has to
be taken into account. It is important to keep the resistance of the sense leads at or below
0.5Ohm for each lead in order to meet the above-specified performance.
3.7.2 Output Rating
The rated output voltage and current specifications apply at the output terminals. When using
Remote Voltage Sense, any voltage dropped along the load leads has to be taken into
account and added to the load voltage in order to achieve the correct output voltage. However,
the performance specifications cannot be assured when the maximum output voltage at the
output terminals is exceeded. In the event this occurs, UNREG will be shown on the display.
3.7.3 Output Interference
Any interference (noise) occurring on the sense leads also appears at the output of the power
supply. This may affect the voltage load regulation as well. To minimize external noise, it is
better to twist the sense leads, and run them in parallel and close to the load leads. The sense
leads must be shielded in any case, and the shield must be grounded at the power supply end
only.
Note
Don't use the shield as one of the sense conductors.
3.7.4 Stability
When you use the external sense under certain combinations of load lead lengths, and large
load capacitances, a filter may be created as part of the voltage feedback loop. In addition,
the extra phase shift generated by this filter can decrease the power supply's stability, slowing
down the transient response. In extreme cases, it may cause power supply oscillations. To
minimize this potential issue, keep the load leads as short as possible and twist them together.
When the remote sense leads are used, various adverse effects can occur as a result of
accidental open-connections of the sense or load leads during external sense operation. To
avoid these effects, please provide secure permanent connections.
3.7.5 Remote Sensing Connections
Remote Sensing needs to connect the load leads from the output terminals to the load and
the sense leads from the sense terminals to the load as shown below.
Power Supply Operation
3-9
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