Models 2500 and 2502 User’s Manual Digital I/O Port, Output Enable, and Output Configuration 12-7
When the output enable is activated (see “Front panel output configuration,” page 12-8),
the output of the Model 2500 cannot be turned on unless the output enable line is pulled
low through a switch to ground as shown in Figure 12-4A. If the lid of the test fixture
opens (Figure 12-4B), the switch opens, and the output enable line goes high turning the
OUTPUT of the Model 2500 OFF (high impedance). The output can only be turned back
on by first closing the lid of the test fixture and then pressing the OUTPUT ON/OFF key.
Figure 12-4
Using test fixture output
NOTE Output enable can be driven by digital I/O. Allow 100µs settling and response
time. The digital I/O lines are open-collector, edge-sensitive and signals should
be de-bounced to avoid erratic operation.
GND
(Pin 5 or 9)
Interlock Switch
(Lid Closed)
Digital I/O
Model 2500 Test Fixture
A. Model 2500 OUTPUT can be turned on.
Output
Enable
GND
(Pin 5 or 9)
Interlock Switch
(Lid Open)
Model 2500 Test Fixture
B. Model 2500 OUTPUT turns off.
Digital I/O
Output
Enable
(Pin 8)
(Pin 8)
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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