AC08FSM datasheet(159/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 7

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8. Set Power Dissipation to 2.2 W. (2W on 370) For sensitive

SCRs, set at 0.5 W. (0.4 W on 370)

9. Set Horizontal knob to 2 V/DIV.

10. Set Vertical knob to 50 mA/DIV.

11. Increase Variable Collector Supply Voltage until voltage

reaches 12 V on CRT.

12. After 12 V setting is completed, change Horizontal knob to

Step Generator.

Procedure 7: IGT

To measure the IGT parameter:

1. Set Step/Offset Amplitude to 20% of maximum rated IGT.

Note: RGK should be removed when testing IGT.

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

location of the test fixture.

3. Gradually increase Offset Multiplier until device reaches

the conduction point. (Figure AN1006.9) Measure IGT by fol-

lowing horizontal axis to the point where the vertical line

crosses axis. This measured value is IGT. (On 370, IGT will be

numerically displayed on screen under offset value.)

Figure AN1006.9

IGT = 25 µA

Procedure 8: VGT

To measure the VGT parameter:

1. Set Offset Multiplier to 0 (zero). (Press Aid and Oppose at

the same time on 370.)

2. Set Step Offset Amplitude to 20% rated VGT.

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

location of test fixture.

4. Gradually increase Offset Multiplier until device reaches

the conduction point. (Figure AN1006.10) Measure VGT by

following horizontal axis to the point where the vertical line

crosses axis. This measured value is VGT. (On 370, VGT will

be numerically displayed on screen, under offset value.)

Procedure 9: GT will be numerically displayed on screen

under offset value.)

Figure AN1006.10 VGT = 580 mV

Triacs

Triacs are full-wave bidirectional AC switches turned on when

current is supplied to the gate terminal of the device. If gate con-

trol in all four quadrants is required, then a sensitive gate triac is

needed, whereas a standard triac can be used if gate control is

only required in Quadrants I through III.

To connect the triac:

1. Connect the Gate to the Base Terminal (B).

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

3. 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

MT2 with reference to MT1.

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

1. Set Variable Collector Supply Voltage Range to appropri-

ate Max Peak Volts for device under test. (Value selected

should be equal to the device’s VDRM rating.)

WARNING: Do NOT exceed VDRM/VRRM rating of SCRs, tri-

acs, or Quadracs. These devices can be damaged.

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

trace at the required voltage level. (The 100 V/DIV scale

should be used for testing devices having a VDRM rating of

600 V or greater; the 50 V/DIV scale for testing parts rated

from 30 V to 500 V, and so on.)

3. Set Mode to Leakage.

4. Set Polarity to (+).

5. Set Power Dissipation to 0.5 W. (0.4 W on 370)

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

7. Set Vertical knob to ten times the maximum leakage current

(IDRM) specified for the device.

Note: The CRT screen readout should show 1% of the maxi-

mum leakage current. The vertical scale is divided by 1,000

when leakage mode is used.

PER

DIV

PER

DIV

PER

IGT

()k

DIV

PER

DIV

5 K

PER

DIV

PER

DIV

PER

VGT

200

250m

()k

DIV

PER

DIV

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