Velleman SCR100 - Manual (Page 6)

Atlas SCR User Guide January 2008 – Rev 3
Page 6
Silicon Controlled rectifiers (SCRs)
The Atlas will analyse almost any SCR provided that a gate trigger
current of no more than 90mA is required.
The three test clips can be connected to
the device under test any way round. If
the Atlas detects an SCR, the following
message will be displayed:
Pressing the scroll/off button will then
display the pinout details for the device.
In this example, the Anode of the SCR is connected to the Red test clip, the
Cathode is connected to the Green test clip, and the Gate terminal is connected
to the Blue test clip. The gate trigger current is displayed on the next screen.
Note that SCRs are often only specified
to have a certain maximum trigger
current – the actual (measured) trigger
current may be well below that value.
The load current at which the SCR was
tested is also displayed. This value is
fixed for all devices, and simply serves
as a reminder. The
symbol indicates
that this is the final page of information. Pressing the scroll/off button again
will return the display to the first page of information.
SCR detected
Details follow
RED GREEN BLUE
Anod Cath Gate
Trigger current
I
G
=50 to 75mA
Tested at a load
current of 0.1A
A
K
G