
Application Notes
AN1006
2002 Teccor Electronics
Thyristor Product Catalog
AN1006 - 7
http://www.teccor.com
+1 972-580-7777
8. Set 
Power Dissipation
 to 
2.2 W. 
(
2 W
 on 370) For sensitive 
SCRs, set at 0.5 W. (
0.4 W
 on 370)
9. Set 
Horizontal
knob to 
2 V/DIV
.
10. Set 
Vertical
 knob to 
50 mA/DIV
.
11. Increase
Variable Collector Supply Voltage
 until voltage 
reaches 12 V on CRT.
12. After 12 V setting is completed, change
Horizontal
 knob to 
Step Generator
.
Procedure 7: I
GT
To measure the I
GT
 parameter:
1. Set 
Step/Offset Amplitude
 to 20% of maximum rated I
GT
.
Note: R
GK
 should be removed when testing I
GT
.
2. Set
Left-Right Terminal Jack Selector
 to correspond with 
location of the test fixture.
3. Gradually increase
Offset Multiplier
 until device reaches 
the conduction point. (Figure AN1006.9) Measure I
GT
 by fol-
lowing horizontal axis to the point where the vertical line 
crosses axis. This measured value is I
GT
. (On 370, I
GT
 will be 
numerically displayed on screen under offset value.)
Figure AN1006.9
I
GT
 = 25 μA
Procedure 8: V
GT
To measure the V
GT
 parameter:
1. Set 
Offset Multiplier
 to 
0
 (zero). (Press 
Aid
 and O
ppose
 at 
the same time on 370.)
2. Set 
Step Offset Amplitude
 to 20% rated V
GT
.
3. Set
Left-Right Terminal Jack Selector
 to correspond with 
location of test fixture.
4. Gradually increase 
Offset Multiplier
 until device reaches 
the conduction point. (Figure AN1006.10) Measure V
GT
 by 
following horizontal axis to the point where the vertical line 
crosses axis. This measured value is V
GT
. (On 370, V
GT
 will 
be numerically displayed on screen, under offset value.)
Procedure 9:
GT
 will be numerically displayed on screen 
under offset value.)
Figure AN1006.10 V
GT
 = 580 mV
Triacs 
Triacs are full-wave bidirectional AC switches turned on when 
current is supplied to the gate terminal of the device. If gate con-
trol in all four quadrants is required, then a sensitive gate triac is 
needed, whereas a standard triac can be used if gate control is 
only required in Quadrants I through III. 
To connect the triac: 
1. Connect the 
Gate
 to the 
Base Terminal 
(B). 
2. Connect
 MT1
 to the 
Emitter Terminal 
(E). 
3. Connect 
MT2
 to the 
Collector Terminal
 (C). 
To begin testing, perform the following procedures.
Procedure 1: (+)V
DRM
, (+)I
DRM
, (-)V
DRM
, (-)I
DRM
Note: The (+) and (-) symbols are used to designate the polarity 
MT2 with reference to MT1.
To measure the (+)V
DRM
, (+)I
DRM
, (-)V
DRM
, and (-)I
DRM
 parameter:
1. Set
Variable Collector Supply Voltage Range
 to appropri-
ate
 Max Peak Volts
 for device under test. (Value selected 
should be equal to the device’s V
DRM
 rating.)
WARNING: Do NOT exceed V
DRM
/V
RRM
 rating of SCRs, tri-
acs, or 
Quadracs
. These devices can be damaged.
2. Set 
Horizontal
 knob to sufficient scale to allow viewing of 
trace at the required voltage level. (The 
100 V/DIV
 scale 
should be used for testing devices having a V
DRM
 rating of 
600 V or greater; the 
50 V/DIV
 scale for testing parts rated 
from 30 V to 500 V, and so on.)
3. Set 
Mode
 to 
Leakage
.
4. Set 
Polarity
 to (+).
5. Set 
Power Dissipation
 to 
0.5 W
. (
0.4 W
 on 370)
6. Set
Terminal Selector
 to 
Emitter Grounded-Open Base
.
7. Set 
Vertical
 knob to ten times the maximum leakage current 
(I
DRM
) specified for the device.
Note: The CRT screen readout should show 1% of the maxi-
mum leakage current. The vertical scale is divided by 1,000
when leakage mode is used.
50
mA
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
IGT
()k
DIV
9m
PER
DIV
10
  A
5 K
50
mA
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
VGT
200
mV
250m
()k
DIV
9m
PER
DIV