K0900E70 Datasheet, PDF (161/224 Pages) Teccor Electronics – Thyristor Product Catalog

Application Notes
AN1006
3. Set Max Peak Volts to 75 V. (80 V on 370)
4. Set Mode to DC.
5. Set Horizontal knob to Step Generator.
6. Set Vertical knob to approximately 10% of the maximum I_H
specified.
Note: Due to large variation of holding current values, the
scale may have to be adjusted to observe holding current.
7. Set Number of Steps to 1.
8. Set Step/Offset Polarity to non-inverted (button extended,
on 577 button depressed).
9. Set Offset by depressing 0 (zero). (Press Aid and Oppose at
same time on 370.)
10. Set Terminal Selector to Step Generator-Emitter Grounded.
Procedure 8: I_H(Forward)
To measure the I_{H (Forward)} parameter:
1. Set Polarity to (+).
2. Set Left-Right Terminal Jack Selector to correspond with
location of test fixture.
3. Increase Variable Collector Supply Voltage to maximum
position (100).
4. Set Step Family by depressing Single.
This could possibly cause the dot on the CRT to disappear,
depending on the vertical scale selected).
5. Decrease Variable Collector Supply Voltage to the point
where the line on the CRT changes to a dot. The position of
the beginning point of the line, just before the line becomes a
dot, represents the holding current value.
(Figure AN1006.13)
PER
V
E
5
R
T
mA
DIV
PER
H
O
R
I
Z
DIV
PER
S
50
T
E
mA
P
IH
()k
DIV
9m 100m
PER
DIV
Figure AN1006.13 I_{H (Forward)} = 8.2 mA
Procedure 9: I_H(Reverse)
To measure the I_{H (Reverse)} parameter:
1. Set Polarity to (–).
2. Repeat Procedure 7 measuring I_H(Reverse). (Read measure-
ments from upper right corner of the screen.)
Procedure 10: I_GT
To measure the I_GT parameter:
1. Set Polarity to (+).
2. Set Number of Steps to 1. (Set number of steps to 0 (zero)
on 370.)
3. Set Offset by depressing Aid. (On 577, also set Zero button
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 Vertical knob to 50 mA/DIV.
12. Set Step/Offset Polarity to non-inverted position (button
extended, on 577 button depressed).
13. Set Variable Collector Supply Voltage until voltage
reaches 12 V on CRT.
14. After 12 V setting is completed, change Horizontal knob to
Step Generator.
Procedure 11: I_GT – Quadrant I [MT2 (+) Gate (+)]
To measure the I_GT – Quadrant I parameter:
1. Set Step/Offset Amplitude to approximately 10% of rated
I_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 AN1006.14) Measure I_GT by follow-
ing horizontal axis to the point where the vertical line passes
through the axis. This measured value is I_GT. (On 370, I_GT is
numerically displayed on screen under offset value.)
IGT
Figure AN1006.14 I_GT in Quadrant I = 18.8 mA
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
©2002 Teccor Electronics
Thyristor Product Catalog
AN1006 - 9
http://www.teccor.com
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