B&K Precision 1688B - Manual - Manual (Page 23)

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Shorting Pin 5 to Pin 4 (ground) will turn the output off.
When output is off, the CV and CC LED will flash. The current output voltage and
current setting will show on the panel meter.
You can also adjust the output by voltage and current control knob to your desired
value when output is off.
5.2 PC Interface Control
Note: The power supply must be in Normal Mode for PC interface control.
5.2.1 General Functions and Display
The remote control PC software will display all output voltage, current, and power
readings. Power supply voltage and current values can be set in two different ways.
Values can either be entered via keyboard or set by clicking on the displayed voltage
and current setting (left click to increase value, right click to decrease value). The
output status is also shown and can also be clicked to set the power supply output
ON or OFF.
Figure 7 - PC Software General Functions and Display