AC08FSM datasheet(166/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 14

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Procedure 3: (-) VDRM and (-) IDRM

To measure the (-)VDRM and (-)IDRM parameter:

1. Set Polarity to (–).

2. Repeat Procedures 1 and 2. (Read measurements from

upper right corner of the screen).

Procedure 4: VBO and IBO

To measure the VBO and IBO parameter:

1. Set Variable Collector Supply Voltage Range to 1500 Max

Peak Volts. (2000 V on 370)

2. Set Horizontal knob to a sufficient scale to allow viewing of

trace at the required voltage level (50 V/DIV for 95 V to

215 V VBO range devices and 100 V/DIV for devices having

VBO ≥ 15 V).

3. Set Vertical knob to 50 µA/DIV.

4. Set Polarity to AC.

5. Set Mode to Norm.

6. Set Power Dissipation to 10 W.

7. Set Terminal Selector to Emitter Grounded-Open Base.

8. Set Left-Right Terminal Jack Selector to correspond with

location of test fixture.

Procedure 5: VBO

To measure the VBO parameter, increase Variable Collector

Supply Voltage until breakover occurs. (Figure AN1006.23) The

voltage at which current begins to flow and voltage on CRT does

not increase is the VBO value.

Figure AN1006.23 (+)VBO = 100 V; (-)VBO = 100 V; (±)IBO < 10 µA

Procedure 6: IBO

To measure the IBO parameter, at the VBO point, measure the

amount of device current just before the device reaches the

breakover mode. The measured current at this point is the IBO

value.

Note: If IBO is less than 10 µA, the current cannot readily be seen

on the curve tracer.

Procedure 7: IH(Forward and Reverse)

To measure the IH (Forward and Reverse) parameter:

1. Set Variable Collector Supply Voltage Range to 1500 Max

Peak Volts (400 V on 577; 2000 V on 370).

2. Set Horizontal knob to a sufficient scale to allow viewing of

trace at the required voltage level (50 V/DIV for devices with

VBO range from 95 V to 215 V and 100 V/DIV for devices

having VBO

≥ 215 V).

3. Set Vertical knob to 20% of maximum holding current speci-

fied.

4. Set Polarity to AC.

5. Set Mode to Norm.

6. Set Power Dissipation to 220 W (100 W on 577).

7. Set Terminal Selector to Emitter Grounded-Open Base.

8. Set Left-Right Terminal Jack Selector to correspond with

the location of the test fixture.

WARNING: Limit test time to 15 seconds maximum.

9. Increase Variable Collector Supply Voltage until device

breaks over and turns on. (Figure AN1006.24)

Figure AN1006.24 IH = 48 mA in both forward and reverse

directions

IH is the vertical distance between the center horizontal axis and

the beginning of the line located on center vertical axis.

Procedure 8: VTM(Forward and Reverse)

To measure the VTM (Forward and Reverse) parameter:

1. Set Variable Collector Supply Voltage Range to 350 Max

Peak Volts. (400 V on 370)

2. Set Horizontal knob to 0.5 V/DIV.

3. Set Vertical knob to 0.5 A/DIV.

4. Set Polarity to (+).

5. Set Mode to Norm.

6. Set Power Dissipation to 220 W (100 W on 577).

7. Set Terminal Selector to Emitter Grounded-Open Base.

Before continuing with testing, note the following:

•

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 volt-

age drop in fixture. If a Kelvin fixture is not available,

Figure AN1006.3 shows necessary information to wire a test

fixture with Kelvin Connections.

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

VBO

+VBO

+IBO

IBO

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

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