AN1006
Application Notes
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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