
AN1006
Application Notes
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+1 972-580-7777 
AN1006 - 10
2002 Teccor Electronics
Thyristor Product Catalog
Procedure 12: I
GT
 – Quadrant II [MT2 (+) Gate (-)] 
To measure the I
GT
 – Quadrant II parameter:
1. Set 
Step/Offside Polarity
 by depressing Invert (release but-
ton on 577).
2. Set 
Polarity
 to (+).
3. Set observed dot to bottom right corner of CRT grid by turn-
ing the horizontal position knob. When Quadrant II testing is 
complete, return dot to original position.
4. Repeat Procedure 11.
Procedure 13: I
GT
 – Quadrant III [MT2 (-) Gate (-)] 
To measure the I
GT
 – Quadrant III parameter:
1. Set 
Polarity
 to (–).
2. Set 
Step/Offset Polarity
 to non-inverted position (button 
extended, on 577 button depressed).
3. Repeat Procedure 11. (Figure AN1006.15)
Figure AN1006.15 I
GT
 in Quadrant III = 27 mA
Procedure 14: I
GT
 – Quadrant IV [MT2 (-) Gate (+)] 
To measure the I
GT
 – Quadrant IV parameter:
1. Set 
Polarity
 to (–).
2. Set 
Step/Offset Polarity
 by depressing 
Invert
 (release but-
ton on 577).
3. Set observed dot to top left corner of CRT grid by turning the 
Horizontal
 position knob. When Quadrant IV testing is com-
plete, return dot to original position.
4. Repeat Procedure 11.
Procedure 15: V
GT
To measure the V
GT
 parameter:
1. Set 
Polarity
 to (+).
2. Set 
Number of Steps
 to 
1
. (Set steps to 
0
 (zero) on 370.)
3. Set 
Offset
 by depressing 
Aid. 
(On 577, also set 
0
 (zero) but-
ton to 
Offset
. Button is extended.)
4. Set
Offset Multiplier
 to 
0
 (zero). (Press 
Aid
 and O
ppose
 at 
same time on 370.)
5. Set 
Terminal Selector
 to 
Step Generator-Emitter Grounded
.
6. Set 
Mode
 to 
Norm
.
7. Set 
Max Peak Volts
 to 
15 V
. (
16 V
 on 370)
8. Set
Power Dissipation
 to
 10 W
.
9. Set 
Step Family
 by depressing
 Single
.
10. Set 
Horizontal
 knob to 
2 V/DIV
.
11. Set 
Step/Offset Polarity
 to non-inverted position (button 
extended, on 577 button depressed).
12. Set 
Current Limit
 to 500 mA (not available on 577).
13. Increase
Variable Collector Supply Voltage
 until voltage 
reaches 12 V on CRT.
14. After 12 V setting is complete, change 
Horizontal
 knob to 
Step Generator.
Procedure 16: V
GT
 – Quadrant I [MT2 (+) Gate (+)] 
To measure the V
GT
 – Quadrant I parameter:
1. Set 
Step/Offset Amplitude
 to 20% of rated V
GT
.
2. Set 
Left-Right Terminal Jack Selector
 to correspond with 
location of test fixture.
3. Gradually increase
Offset Multiplier
 until device reaches 
conduction point. (Figure AN1006.16) Measure V
GT
 by fol-
lowing horizontal axis to the point where the vertical line 
passes through the axis. This measured value will be V
GT
. 
(On 370, V
GT
 will be numerically displayed on screen under 
offset value.)
Figure AN1006.16 V
GT
 in Quadrant I = 780 mV
Procedure 17: V
GT
 – Quadrant II [MT2 (+) Gate (-)]
To measure the V
GT
 – Quadrant II parameter:
1. Set 
Step/Offset Polarity
 by depressing 
Invert
 (release but-
ton on 577).
2. Set 
Polarity
 to (+).
3. Set observed dot to bottom right corner of CRT grid by turn-
ing the horizontal position knob. When Quadrant II testing is 
complete, return dot to original position.
4. Repeat Procedure 16.
Procedure 18: V
GT
 – Quadrant III [MT2 (-) Gate (-)]
To measure the V
GT
 – Quadrant III parameter:
1. Set
Polarity
 to (–).
2. Set 
Step/Offset Polarity
 to non-inverted position (button 
extended, on 577 button depressed).
50
mA
10
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
5
mA
IGT
50
mA
500
mV
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
100m
VGT