AC08FSM datasheet(165/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 13

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Procedure 11: IH(Forward and Reverse)

For these steps, it is again necessary to connect the Trigger to

MT2 through a 10

Ω resistor. The other connections remain the

same.

To measure the IH (Forward and Reverse) parameter:

1. Set Power Dissipation to 50 W.

2. Set Max Peak Volts to 75 V. (80 V on 370)

3. Set Mode to DC.

4. Set Horizontal knob to 5 V/DIV.

5. Set Vertical knob to approximately 10% of the maximum IH

specified.

Note: Due to large variations of holding current values, the

scale may have to be adjusted to observe holding current.

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

Procedure 12: IH(Forward)

To measure the IH (Forward) parameter:

1. Set Polarity to (+).

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

the location of the test fixture.

3. Increase Variable Collector Supply Voltage to maximum

position (100).

Note: Depending on the vertical scale being used, the dot

may disappear completely from the screen.

4. 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 changes to

a dot, represents the IH value. (Figure AN1006.21)

Figure AN1006.21 IH (Forward) = 18 mA

Procedure 13: IH(Reverse)

To measure the IH (Reverse) parameter:

1. Set Polarity to (–).

2. Continue testing per Procedure 12 for measuring IH (Reverse).

Sidacs

The sidac is a bidirectional voltage-triggered switch. Upon appli-

cation of a voltage exceeding the sidac breakover voltage point,

the sidac switches on through a negative resistance region (simi-

lar to a diac) to a low on-state voltage. Conduction continues until

current is interrupted or drops below minimum required holding

current.

To connect the sidac:

1. Connect MT1 to the Emitter Terminal (E).

2. Connect MT2 to the Collector Terminal (C).

To begin testing, perform the following procedures.

Procedure 1: (+) VDRM, (+)IDRM, (-)VDRM, (-)IDRM

Note: The (+) and (-) symbols are used to designate the polarity

of MT2 with reference to MT1.

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

1. Set Variable Collector Supply Voltage Range to 1500 Max

Peak Volts.

2. Set Horizontal knob to 50 V/DIV.

3. Set Mode to Leakage.

4. Set Polarity to (+).

5. Set Power Dissipation to 2.2 W. (2W on 370)

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

7. Set Vertical knob to 50 µA/DIV. (Due to leakage mode, the

CRT readout will show 50 nA.)

Procedure 2: (+)VDRM and (+)IDRM

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

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

the location of the test fixture.

2. Increase Variable Collector Supply Voltage to the rated

VDRM of the device and observe the dot on the CRT. Read

across horizontally from the dot to the vertical current scale.

This measured value is the leakage current.

(Figure AN1006.22)

Figure AN1006.22 IDRM = 50 nA at VDRM = 90 V

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

VDRM

IDRM

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