AMETEK DLM 600W Series - Manual (Page 56)

DLM 600W Series
M362161-01 K 3-10
3.6.3 V/I and OVP PREVIEW Switches
The V/I and OVP PREVIEW switches allow the front panel displays to show the
programmed values for the output voltage, current, and OVP. They can be used to set
the output parameters prior to turning on the output, and without disturbing the load
connections. In addition, they allow checking the settings after the output is enabled.
The preview functions remain operational when remote control is selected, either the
analog or GPIB interface.
3.6.4 LOCAL/REMOTE Switch
The LOCAL/REMOTE switch allows selecting either the front panel controls or the
remote interface for programming the output voltage, current, or OVP. A remote
interface (either analog or GPIB) must be enabled for the switch to be functional.
With the REMOTE ANALOG INTERFACE, the switch provides a toggle function to
alternate between the programmed settings of the front panel and analog interface
every time it is pressed. The REM front panel indicator is turned on when control is
through the analog interface. The LOCAL–LOCKOUT control signal of the interface
could be used to disable the toggling and maintain remote control.
When the GPIB interface is enabled, pressing the switch will transfer control to the front
panel; however, toggling will not occur if it is pressed again. The GPIB controller must
issue a command to the power supply before control will revert to the GPIB. A local–
lockout function is also available with the GPIB interface.
3.7 Reverse Polarity Protection
The output of the power supply is protected against reverse polarity sources connected
to the output terminals. The output terminals have diodes connected directly across
them. If the voltage at the output were to reverse in polarity, the diodes would conduct
and clamp it to a forward voltage drop, of approximately 1V.