AC08FSM datasheet(158/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 6

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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 IT(RMS) rating of the device (IT(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 IT(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

VTM 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 IT(peak), which is twice the IT(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 IT(peak), After the

Variable Collector Supply Voltage has been set to IT(peak), the

test time can automatically be shortened by changing Step

Family from repetitive to single by depressing the Single

button.

To measure VTM, follow along horizontal scale to the point where

the trace crosses the IT(peak) value. The distance from the left-

hand side of scale to the intersection point is the VTM value.

(Figure AN1006.7)

Figure AN1006.7

VTM = 1.15 V at IT(peak) = 12 A

Procedure 5: IH

To measure the IH parameter:

1. Set Polarity to (+).

2. Set Power Dissipation to 2.2 W. (2W 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 IH 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 IGT 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)

Figure AN1006.8

IH = 1.2 mA

Procedure 6: IGT and VGT

To measure the IGT and VGT 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)

500

PER

DIV

PER

DIV

PER

IPK

VTM

()k

DIV

PER

DIV

100

500

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

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