B&K Precision 1688B - Manual - Manual (Page 19)

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Figure 4 - Pin Numbers
(c) Make sure the load is disconnected and the power supply is OFF.
(d) Plug the remote connector plug into the analog remote control terminal of the
power supply.
(e) Secure the remote connector plug to the terminal socket by screwing in the
connector ring (
Figure 5).
Figure 5 - Connector Ring
Then, you can choose one of the following two methods to use the analog remote
control feature: (1) Using two external variable DC voltage sources or (2) using two 5
kΩ variable resistors.