Velleman SCR100 - Manual (Page 10)

Atlas SCR User Guide January 2008 – Rev 3
Page 10
Gate Sensitivity
The Peak Atlas SCR attempts to trigger the device under test at eight discrete
gate currents, in ascending order.
Trigger test level 1 100
µA
Trigger test level 2 500
µA
Trigger test level 3 2.5mA
Trigger test level 4 10mA
Trigger test level 5 25mA
Trigger test level 6 50mA
Trigger test level 7 75mA
Trigger test level 8 90mA
Thus, for example, a reported trigger current of 10mA means that device
triggering occurred at a gate current of 10mA, but not at 2.5mA. Therefore the
trigger current for the device under test is between 2.5mA and 10mA.
Although Triacs are tested in both quadrants 1 and 3, the reported gate trigger
current (for both SCRs and Triacs) is that which applies to quadrant 3.
First test
Last test