K0900E70 Datasheet, PDF (163/224 Pages) Teccor Electronics – Thyristor Product Catalog

Application Notes
AN1006
3. Repeat Procedure 16. (Figure AN1006.17)
VGT
PER
V
E
50
R
T
mA
DIV
PER
H
O
R
I
Z
DIV
PER
S ₅₀₀
T
E
mV
P
()k
DIV
9m 100m
PER
DIV
Figure AN1006.17 V_GT in Quadrant III = 820 mV
Procedure 19: V_GT – Quadrant IV [MT2 (-) Gate (+)]
To measure the V_GT – 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: (+)V_DRM, (+)I_DRM, (-)V_DRM, (-)I_DRM
Note: The (+) and (-) symbols are used to designate the polarity
of MT2 with reference to MT1.
To measure the (+)V_DRM, (+)I_DRM, (-)V_DRM, and (-)I_DRM 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 V_DRM 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 V_DRM 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
(I_DRM) 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: (+)V_DRM and (+)I_DRM
To measure the (+)V_DRM and (+)I_DRM 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
V_DRM 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 V_DRM/V_RRM rating of SCRs, triacs,
or Quadracs. These devices can be damaged.
PER
V
E
50
R
T
nA
DIV
PER
H
O
R
50
I
V
Z
DIV
VDRM
PER
S
T
E
P
()k
DIV
9m
IDRM PER
DIV
Figure AN1006.18 (+)I_DRM = 51 nA at (+)V_DRM = 400 V
Procedure 3: (-)V_DRM and (-)I_DRM
To measure the (-)V_DRM and (-)I_DRM parameter:
1. Set Polarity to (–).
2. Repeat Procedures 1 and 2. (Read measurements from
upper right corner of screen).
Procedure 4: V_BO, I_BO, ∆V_BO
(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 V_BO, I_BO, and ∆V_BO 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)
©2002 Teccor Electronics
Thyristor Product Catalog
AN1006 - 11
http://www.teccor.com
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