AC16FSM datasheet(170/223 Pages) TECCOR

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AN1006

Application Notes

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AN1006 - 18

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Thyristor Product Catalog

Model 577 Curve Tracer Procedure Notes

Because the curve tracer procedures in this application note are written for the Tektronix model 576 curve tracer, certain settings must

be adjusted when using model 577. Model 576 curve tracer has separate controls for polarity (AC,+,-) and mode (Norm, DC, Leakage),

whereas Model 577 has only a polarity control. The following table shows the guidelines for setting Collector Supply Polarity when

using model 577. (Figure AN1006.28)

One difference between models 576 and 577 is the Step/Offset

Polarity setting. The polarity is inverted when the button is

depressed on the Model 576 curve tracer. The Model 577 is

opposite

 the Step/Offset Polarity is “inverted” when the button

is extended and “Normal” when the button is depressed. The

Step/Offset Polarity is used only when measuring IGT and VGT of

triacs and Quadracs in Quadrants l through lV.

Also, the Variable Collector Supply Voltage Range and Power

Dissipation controls have different scales than model 576. The

following table shows the guidelines for setting Power Dissipation

when using model 577.

Although the maximum power setting on model 576 curve tracer

is 220 W (compared to 100 W for model 577), the maximum col-

lector current available is approximately the same. This is due to

the minimum voltage range on model 577 curve tracer being

6.5 V compared to 15 V for model 576. The following table shows

the guidelines for adapting Collector Voltage Supply Range set-

tings for model 577 curve tracer procedures:

Model 576

Model 577

If using Leakage mode along with polarity setting of +(NPN) and -(PNP),

[vertical scale divided by 1,000],

set Collector Supply Polarity to either +DC or -DC, depending on polarity setting

specified in the procedure. The vertical scale is read directly from the scale on the

control knob.

If using DC mode along with either +(NPN) or -(PNP) polarity,

set Collector Supply Polarity to either +DC or -DC depending on polarity

specified.

If using Norm mode along with either +(NPN) or -(PNP) polarity,

set Collector Supply Polarity to either +(NPN) or -(PNP) per specified procedure.

If using Norm mode with

AC polarity,

set Collector Supply Polarity to AC.

Model 576

Model 577

If power dissipation is 0.1 W,

set at 0.15 W.

If power dissipation is 0.5 W,

set at 0.6 W.

If power dissipation is 2.2 W,

set at 2.3 W.

If power dissipation is 10 W,

set at 9 W.

If power dissipation is 50 W,

set at 30 W.

If power dissipation is 220 W,

set at 100 W.

Model 576

Model 577

If voltage range is 15 V,

set at either 6.5 V or 25 V, depending on parameter

being tested. Set at 6.5 V when measuring VTM (to

allow maximum collector current) and set at 25 V

when measuring IGT and VGT.

If voltage range is 75 V,

set at 100 V.

If voltage range is 1500 V,

set at 1600 V.

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