SCR Test Procedure with Continuity Tester

SCR Test Procedure with Continuity Tester
SCR Test Procedure with Continuity Tester
(A Flashlight Continuity Tester is Best)
1. Determine the polarity of the Continuity Tester Leads
Isolate (G) & (K) leads on the SCR.
G
2. Connect the Continuity Tester between the Anode (A) and
Cathode (C) as Shown in fig, 1.
A
C
-
k
+
The Continuity Tester Should NOT Light.
3. Reverse the Continuity Tester Leads as Shown in Fig. 2.
OFF
The Continuity Tester Should NOT Light Again.
Fig.1
4. With Continuity Tester leads connected as in Fig. 2,
G
Touch the Gate lead (G) to the Anode as Shown in Fig. 3.
The Continuity Tester Should Light.
Remove Gate lead (G), Continuity Tester Will Dim but Stay
A
C
+
k
-
Lit.
OFF
Touch lead (K) to Anode as Shown in Fig. 4,
Fig.2
Continuity Tester Light will go Bright.
Short
Remove lead (K), Light will go out.
G
5. If Continuity Tester Light is Lit in Step 2 or 3 the SCR is
Shorted.
If Continuity Tester Light is Not Lit on Step 4 the SCR is
A
C
+
k
-
Open.
ON
Fig.3
Note:
In Most Cases Gate Lead (G) is White and Cathode Lead (K) is Red.
G
A
+
(G)
Gate
C
k
Short
ON
Fig.4
Cathode
(K)
)
Silicon-controlled
rectifier (SCR)
(G
Anode
-
SCR Diagram
(G)
Anode
Gate
Cathode
(K)
Silicon-controlled
rectifier (SCR)
Cathode
K
(K)
Cathode
G
(G)
Gate
Anode
Anode
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