Agilent Technologies 66001A - Manual (Page 22)

22 Installation
Remote Voltage Sensing
Figure 2-4B shows the wiring for remote sensing. There is a switch on the output connector that selects either local or
remote sensing of the output voltage. To configure the output for remote sensing, do the following:
■ Connect sense leads to the load
■ Make certain that the connector switch is set to REMOTE
Note If you leave the connector switch in LOCAL, the power module will regulate the programmed voltage at
the connector, not at the load.
Because they do not carry load current, you may use smaller gauge wire for the remote sense leads.
Be careful to avoid open circuits in the sense leads, such as leaving the output connector sense switch in the Local position.
If this happens, the power module will regulate at its output terminals instead of at the load.
Note If the sense terminals are left open, the voltage at the output terminals will increase approximately 3 to 5%
over the programmed value. The readback voltage will not indicate this increase because readback is
measured at the sense terminals.
Figure 2-4. Load Connection
The dashed lines in the connection drawings illustrate remote sense connections. In this case, the remote sense terminals of
the power module are connected to the load rather than the output terminals. This allows the power module to automatically
compensate for the voltage drop in the load leads as well as to accurately read back the voltage at the load. In remote-sense
applications, the voltage readback from across the load is not the output voltage of the power module. The actual output
voltage is the sum of the load voltage and the voltage drop in the load lead. Keep this output voltage within the power
module’s maximum voltage rating. Failure to do this may result in an unregulated condition, especially when the line
voltage is low.
Voltage Readback
In remote sense applications, the voltage readback occurs directly at the load. This allows the power module to
automatically compensate for the voltage drop in the load leads and to provide an accurate voltage readback directly across
the load.