AC08FSM datasheet(163/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 11

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3. Repeat Procedure 16. (Figure AN1006.17)

Figure AN1006.17 VGT in Quadrant III = 820 mV

Procedure 19: VGT – Quadrant IV [MT2 (-) Gate (+)]

To measure the VGT – Quadrant IV parameter:

1. Set Polarity to (–).

2. Set Step/Offset Polarity by depressing Invert (release but-

ton on 577).

3. Set observed dot to top left corner of CRT grid by turning the

Horizontal position knob. When testing is complete in Quad-

rant IV, return dot to original position.

4. Repeat Procedure 16.

Quadracs

Quadracs are simply triacs with an internally-mounted diac. As

with triacs, Quadracs are bidirectional AC switches which are

gate controlled for either polarity of main terminal voltage.

To connect the Quadrac:

1. Connect Trigger to Base Terminal (B).

2. Connect MT1 to Emitter Terminal (E).

3. Connect MT2 to 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 appropri-

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

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

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 300 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 readout should show 1% of the maximum

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

the leakage mode is used.

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 AN1006.18)

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

or Quadracs. These devices can be damaged.

Figure AN1006.18 (+)IDRM = 51 nA at (+)VDRM = 400 V

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 screen).

Procedure 4: VBO, IBO, ∆VBO

(Quadrac Trigger Diac or Discrete Diac)

To connect the Quadrac:

1. Connect MT1 to Emitter Terminal (E).

2. Connect MT2 to Collector Terminal (C).

3. Connect Trigger Terminal to MT2 Terminal through a 10

Ω

resistor.

To measure the VBO, IBO, and ∆VBO parameter:

1. Set Variable Collector Supply Voltage Range to 75 Max

Peak Volts.(80 V on 370)

2. Set Horizontal knob to 10 V/DIV.

3. Set Vertical knob to 50 µA/DIV.

4. Set Polarity to AC.

5. Set Mode to Norm.

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

100m

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

500

VGT

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

VDRM

IDRM

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