External Programming Input
CCand CV modes can be programmed with a signal (ac or dc) connected to the Ext Prog input. A
Figure 2-10 shows the input waveform that would result from the following setup:
CCMode 60 A Range
20 A Input (programmed via GPIB or front panel)
± 1 V (2 V pk-pk) 1 kHz external programming signal
The external programming signal (+ and - 1 volt) corresponds to + and - 6 amps at the input (1 volt external programming input = 1/10 full scale). Therefore, the input varies ± 6 A at the 20 A level.
Fault
The Fault signal becomes active if an overvoltage or reverse voltage occurs at the input, as described in the Protection Features paragraphs.
Figure 2-10. External Programming Example
Port On/Off
Port is a general purpose output port that can be used to control an external device such as a relay for power supply test purposes. The output is toggled on and off via the GPIB (PORT0 ON OFF command). It cannot be controlled from the front panel.
The Port output signal is a TTL compatible signal that becomes active (high level) when the PORT command is programmed ON and becomes inactive low level) when the PORT command is programmed OFF.
