K0900E70 Datasheet, PDF (158/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1006
Application Notes
6. Set Rate by depressing Norm.
7. Set Step Family by depressing Rep (repetitive).
8. Set Mode to DC.
9. Set Horizontal knob to 0.5 V/DIV.
10. Set Power Dissipation to 220 W (100 W on 577).
11. Set Number of Steps to 1. (Set steps to 0 (zero) on 370.)
12. Set Vertical knob to a sufficient setting to allow the viewing
of 2 times the I_T(RMS) rating of the device (I_T(peak)) on CRT.
Before continuing with testing, note the following:
(1) Due to the excessive amount of power that can be
generated in this test, only parts with an I_T(RMS) rating
of 6 A or less should be tested on standard curve
tracer. If testing devices above 6 A, a Tektronix model
176 high-current module is required.
(2) A Kelvin test fixture is required for this test. If a
Kelvin fixture is not used, an error in measurement of
V_TM will result due to voltage drop in the fixture. If a
Kelvin fixture is not available, Figure AN1006.3 shows
necessary information to wire a test fixture with
Kelvin connectors.
13. Set Left-Right Terminal Jack Selector to correspond with
the location of the test fixture.
14. Increase Variable Collector Supply Voltage until current
reaches rated I_T(peak), which is twice the I_T(RMS) rating of the-
SCR under test.
Note: Model 370 current is limited to 10 A.
WARNING: Limit test time to 15 seconds maximum after the
Variable Collector Supply has been set to I_T(peak), After the
Variable Collector Supply Voltage has been set to I_T(peak), the
test time can automatically be shortened by changing Step
Family from repetitive to single by depressing the Single
button.
To measure V_TM, follow along horizontal scale to the point where
the trace crosses the I_T(peak) value. The distance from the left-
hand side of scale to the intersection point is the V_TM value.
(Figure AN1006.7)
VTM
IPK
PER
V
E
2
R
T
A
DIV
PER
H
O
R
500
I
mV
Z
DIV
PER
S 100
T
E
mA
P
()k
DIV
9m
20
PER
DIV
Figure AN1006.7 V_TM = 1.15 V at I_T(peak) = 12 A
Procedure 5: I_H
To measure the I_H parameter:
1. Set Polarity to (+).
2. Set Power Dissipation to 2.2 W. (2 W on 370)
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 percent of the maxi-
mum 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 Offset by depressing 0 (zero). (Press Aid and Oppose at
the same time on 370.)
9. Set Step/Offset Amplitude to twice the maximum I_GT of the
device.
10. Set Terminal Selector to Step Generator-Emitter Grounded.
11. Set Step Family by depressing Single.
12. Set Left-Right Terminal Jack Selector to correspond with
location of test fixture.
13. Increase Variable Collector Supply Voltage to maximum
position (100).
14. Set Step Family by depressing Single. (This could possibly
cause the dot on CRT to disappear, depending on the verti-
cal scale selected.)
15. Change Terminal Selector from Step Generator-Emitter
Grounded to Open Base-Emitter Grounded.
16. 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 AN1006.8)
PER
V
E
500
R
T
A
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
IH
()k
DIV
9m
PER
DIV
Figure AN1006.8 I_H = 1.2 mA
Procedure 6: I_GT and V_GT
To measure the I_GT and V_GT parameter:
1. Set Polarity to (+).
2. Set Number of Steps to 1.
3. Set Offset by depressing Aid.
4. Set Offset Multiplier to 0 (zero). (Press Aid and Oppose at
the 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)
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AN1006 - 6
©2002 Teccor Electronics
Thyristor Product Catalog