Remote Sensing; Figure 3-13. Local/Remote Voltage Sensing - Ametek SPS A Series Operation Manual

AMREL SPS-A Series

REMOTE SENSING

3.6
Remote voltage sensing is recommended at all times, whether you
connect sensing leads to the load or directly to the output terminals.
Remote sensing at the load provides the best load regulation.
In applications where the load is located some distance from the power
supply, or the voltage drop of the power output leads significantly
interferes with load regulation, remote voltage sensing should definitely
be used.
The voltage accuracy specifications are valid only with remote sense
connected. Disconnecting the remote sense leads will introduce an error,
with the output voltage increasing. The error occurs because an
additional resistance (PTC local resistor network in Figure 3-13) is added
in the circuit of the resistor divider for voltage sensing, to provide the
default local sensing of the output voltage at the output terminals. When
remote sense is connected the PTC local resistor network is short-
circuited, effectively removing it from the circuit.
Sense (+)
Sense (-)
Out (+)
Out (-)
M550129-01 Rev A
PTC
Local
Resistor
Network

Figure 3-13. Local/Remote Voltage Sensing

Remote Sense
Resistor Divider
Remote
Sense
Amplifier
Output
Power
Converter
Operation
3-21