Hunan Next Generation Instrumental T&C Tech. Co., Ltd.
NGI
l
NGI
N39200 Series
High-accuracy Dual-channel Programmable DC Power Supply
15
Figure 12 4-pin Green Connector
6.6.1 Local Sense
In local sense, output voltage is adjusted at the output terminal of N39200. This way
does not compensate for the voltage drop on the load wire. It is recommended to
use local sense when the load current is low or the load regulation is not very critical.
6.6.2 Remote Sense
Due to the parasitic resistance on the wire, a voltage drop will be generated on the
wire after the current flows. Assuming that output of the power supply is set to
55V/10A and the resistance of the load wire is 0.5 ohms, a 5V voltage drop will be
generated on the wire. The actual voltage reaching the load is only 50V, which affects
the output accuracy of the power supply. In this case, it is necessary to compensate
for the voltage drop on the wire.
The remote sense wire is directly connected to the load from four-wire interface on
the rear panel of power supply. Since the remote sense wire is directly connected to
the high impedance measurement circuit inside the supply, and the current on
remote sense wire is very low, the voltage drop generated is negligible. The voltage
across the load is fed back to the power supply control loop via remote sense wire.
The supply will adjust its output to compensate for the voltage drop on the load wire
so that the voltage across the load is equal to the set voltage.
Note: On the 4-pin connector, jumpers have been used to connect
S+
to
+
and
S-
to
-
.
When using local sense, please put the 4-pin connector at rear panel. Unplugging the
connector will leave the remote sense terminal disconnected, which will affect the
voltage regulation and may cause the power supply to be unstable and dangerous.
