Remote Sense Connections; Sense Leads - Agilent Technologies 6631B User Manual

Remote Sense Connections

Under normal operation, the dc source senses the output voltage at the output terminals on the back of the
unit. External sense terminals are available on the back of the unit that allow the output voltages to be
sensed at the load, compensating for impedance losses in the load wiring. You cannot remote sense at the
optional front panel binding posts.
The output terminal block of the unit is shipped configured for local sensing, with the +S terminal
jumpered to +, and the −S terminal jumpered to −. Remove these jumpers when making your sense wire
connections. The terminal block screws are 6-32 X 3/8 inch.

Sense Leads

The sense leads are part of the dc source's feedback path and must be kept at a low resistance (less than
several ohms) to maintain optimal performance. Connect the sense leads carefully so that they do not
become open-circuited. If the sense leads are left unconnected or become open during operation, the dc
source will regulate at the output terminals, resulting in a 3% to 5% increase in output over the
programmed value. Shorting the sense leads trips the OVP circuit.
NOTE: It is good engineering practice to twist and shield all signal wires to and from the sense
connectors. Connect the shield at the dc source end only. Do not use the shield as one of
the sensing conductors.
jumpers
remove
sense
+S
twisted or
shielded pair
Figure 3-3. Remote Sense Connections
+ 240 VDC MAX TO
-
+ -S
-
Installation - 3
-
LOAD
+
25