User manual

13-6 Digital I/O Port, Output Enable, & Output Configuration 2400 Series SourceMeter
®
User’s Manual
Output enable line
NOTE The output enable line can be used by all Series 2400 SourceMeters.
The digital I/O port provides an output enable line for use with a test fixture output
enable switch. When properly used, the OUTPUT of the SourceMeter will turn
OFF when the lid of the test fixture is opened. See Section 2, “Connections,” for
important safety information when using the test fixture switch.
When the output enable is turned on (see “Front panel output configuration,” page
13-7), the output of the SourceMeter cannot be turned on unless the output
enable line is pulled low through a switch to ground as shown in Figure 13-4A. If
the lid of the test fixture opens (Figure 13-4B), the switch opens, and the output
enable line goes high turning the OUTPUT of the SourceMeter OFF (high imped-
ance). The output can only be turned back on by first closing the lid of the test fix-
ture and then pressing the OUTPUT ON/OFF key.