Agilent Technologies 90B manual Remote Sensing Protection with Resistors

To reduce the degree of output overshoot which can result from accidentally opened remote sensing connections, many regulated power supplies include internally wired resistors or small silicon diodes as shown in Figures 50 and 51. If they are not part of the power supply, and if the power supply application involves long sensing leads, sensing paths which include relay, switch, or connector contacts, or any other likely cause of even momentary open-circuits in the remote sensing paths; then the user should add either resistors or silicon diodes.

Figure 50. Remote Sensing Protection with Resistors

If the diode configuration of Figure 51 is employed, operation will be satisfactory up to about 0.5 volts drop in either load lead (between a power supply output terminal and the corresponding DC Distribution Terminal); for greater drops use two or more diodes in series.

Figure 51. Remote Sensing Protection with Diodes

76