AC08FSM datasheet(160/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 8

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

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

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

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 AN1006.11)

Figure AN1006.11 (+)IDRM = 205 nA at (+)VDRM = 600 V

Procedure 3: (-)VDRM, (-)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: VTM (Forward and Reverse)

To measure the VTM (Forward and Reverse) parameter:

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

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

of the device (to insure the device turns on).

3. Set Variable Collector Supply Voltage Range to 15 V Max

Peak volts. (16 V on 370)

4. Set Offset by depressing 0 (zero).

5. Set Rate by depressing Norm.

6. Set Step Family by depressing Rep (Repetitive).

7. Set Mode to Norm.

8. Set Horizontal knob to 0.5 V/DIV.

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

10. Set Number of Steps to 1.

11. Set Step/Offset Polarity to non-inverted (button extended;

on 577 button depressed).

12. Set Vertical knob to a sufficient setting to allow the viewing

of 1.4 times the IT(RMS) rating of the device [IT(peak) on CRT].

Note the following:

•

Due to the excessive amount of power that can be generated in

this test, only parts with an IT(RMS) rating of 8 A or less should be

tested on standard curve tracer. If testing devices above 8 A, a

Tektronix model 176 high-current module is required.

•

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.

Procedure 5: VTM (Forward)

To measure the VTM (Forward) parameter:

1. Set Polarity to (+).

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

location of test fixture.

3. Increase Variable Collector Supply Voltage until current

reaches rated IT(peak), which is 1.4 times IT(RMS) rating of the

triac under test.

Note: Model 370 current is limited to 10 A.

WARNING: Limit test time to 15 seconds maximum. After

the Variable Collector Supply Voltage has been set to IT(peak),

the test time can automatically be set to a short test time by

changing Step Family from repetitive to single by depress-

ing the Single button.

To measure VTM, follow along horizontal scale to the point where

the trace crosses the IT(peak) value. The distance from the left-

hand side of scale to the crossing point is the VTM value.

(Figure AN1006.12)

Figure AN1006.12 VTM (forward) = 1.1 V at IPK = 11.3 A (8 A rms)

Procedure 6: VTM (Reverse)

To measure the VTM (Reverse) 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 until current

reaches rated IT(peak).

4. Measure VTM(Reverse) similar to Figure AN1006.12, except from

upper right hand corner of screen.

Procedure 7: IH(Forward and Reverse)

To measure the IH (Forward and Reverse) parameter:

1. Set Step/Offset Amplitude to twice the IGT rating of the

device.

2. Set Power Dissipation to 10 W.

100

PER

DIV

PER

DIV

PER

IDRM

VDRM

()k

DIV

PER

DIV

500

PER

DIV

PER

DIV

PER

VTM

IPK

100

()k

DIV

PER

DIV

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