K0900E70 Datasheet, PDF (162/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1006
Application Notes
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)
IGT
PER
V
E
50
R
T
mA
DIV
PER
H
O
R
I
Z
DIV
PER
S
5
T
E mA
P
()k
DIV
9m
10
PER
DIV
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 Oppose 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.)
VGT
PER
V
E
50
R
T
mA
DIV
PER
H
O
R
I
Z
DIV
PER
S ₅₀₀
T
E
mV
P
()k
DIV
9m _100m
PER
DIV
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).
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AN1006 - 10
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Thyristor Product Catalog