AC08FSM datasheet(157/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 5

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+1 972-580-7777

Figure AN1006.4

VFM = 1 V at IPK = 20 A

SCRs

SCRs are half-wave unidirectional rectifiers turned on when cur-

rent is supplied to the gate terminal. If the current supplied to the

gate is to be in the range of 12 µA and 500 µA, then a sensitive

SCR is required; if the gate current is between 1 mA and 50 mA,

then a non-sensitive SCR is required.

To connect the rectifier:

1. Connect Anode to Collector Terminal (C).

2. Connect Cathode to Emitter Terminal (E).

Note: When sensitive SCRs are being tested, a 1 k

Ω resistor

must be connected between the gate and the cathode, except

when testing IGT.

To begin testing, perform the following procedures.

Procedure 1: VDRM, VRRM, IDRM, IRRM

To measure the VDRM, VRRM, IDRM, and IRRM 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 value 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 approximately ten times the maximum

leakage current (IDRM, IRRM) specified for the device. (For

sensitive SCRs, set to 50 µA.)

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

leakage current if the vertical scale is divided by 1,000 when

leakage current mode is used.

Procedure 2: VDRM, IDRM

To measure the VDRM and IDRM parameter:

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

location of test fixture.

2. Set Variable Collector Supply Voltage to the rated VDRM of

the device and observe the dot on CRT. Read across hori-

zontally from the dot to the vertical current scale. This mea-

sured value is the leakage current. (Figure AN1006.5)

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

or Quadracs. These devices can be damaged.

Figure AN1006.5

IDRM = 350 nA at VDRM = 600 V

Procedure 3: VRRM, IRRM

To measure the VRRM and IRRM parameter:

1. Set Polarity to (–).

2. Repeat Steps 1 and 2 (VDRM, IDRM) except substitute VRRM

value for VDRM. (Figure AN1006.6)

Figure AN1006.6

IRRM = 340 nA at VRRM = 600 V

Procedure 4: VTM

To measure the VTM parameter:

1. Set Terminal Selector to Step Generator-Emitter Grounded.

2. Set Polarity to (+).

3. Set Step/Offset Amplitude to twice the maximum IGT rating

of the device (to ensure the device turns on). For sensitive

SCRs, set to 2mA.

4. Set Max Peak Volts to 15 V. (16 V on 370)

5. Set Offset by depressing 0 (zero).

500

PER

DIV

PER

DIV

PER

VFM

()k

DIV

PER

DIV

100

PER

DIV

PER

DIV

PER

VDRM

IDRM

()k

DIV

PER

DIV

100

PER

DIV

PER

DIV

PER

VRRM

IRRM

()k

DIV

PER

DIV

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