B&K Precision 1688B - Manual - Manual (Page 18)

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4.2.4 Analog Remote Control Mode
Select this mode to control the output voltage and current via remote control
connector. Please refer to
Section 5.1 for more details.
5 Remote Control
There are two methods to remotely control voltage and current.
Note: Both methods require the remote control connector plug to be set up in order
for analog remote control mode to be functional; otherwise the unit will be in CC
mode all the time.
5.1 Analog Remote Control
Set up the provided remote connector plug.
(a) Remove the black portion of the remote control connector plug by removing
the screw as shown in Figure 3.
Figure 3 - Remote Control Connector
(b) Solder 5 wires (22AWG) to pins 1, 2, 3, 4, and 5 of pin plug. Refer to Figure 4
for pin numbers.