
AN1006
Application Notes
http://www.teccor.com
+1 972-580-7777 
AN1006 - 14
2002 Teccor Electronics
Thyristor Product Catalog
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 the screen).
Procedure 4: V
BO
 and I
BO
To measure the V
BO
 and I
BO
 parameter:
1. Set 
Variable Collector Supply Voltage Range
 to 
1500 Max 
Peak Volts. 
(
2000 V
 on 370)
2. Set 
Horizontal
 knob to a sufficient scale to allow viewing of 
trace at the required voltage level (
50 V/DIV
 for 95 V to 
215 V V
BO
 range devices and 
100 V/DIV
 for devices having 
V
BO
≥
 15 V).
3. Set 
Vertical
 knob to 
50 μA/DIV.
4. Set 
Polarity
 to 
AC.
5. Set
Mode
to
 Norm
.
6. Set 
Power Dissipation
 to 
10 W
.
7. Set 
Terminal Selector
 to 
Emitter Grounded-Open Base
.
8. Set
Left-Right Terminal Jack Selector
 to correspond with 
location of test fixture.
Procedure 5: V
BO
To measure the V
BO
 parameter, increase
Variable Collector 
Supply Voltage
 until breakover occurs. (Figure AN1006.23) The 
voltage at which current begins to flow and voltage on CRT does 
not increase is the V
BO
 value.
Figure AN1006.23 (+)V
BO
 = 100 V; (-)V
BO
 = 100 V; (±)I
BO
 < 10 μA
Procedure 6: I
BO
To measure the I
 parameter, at the V
point, measure the 
amount of device current just before the device reaches the 
breakover mode. The measured current at this point is the I
BO
value.
Note: If I
BO
 is less than 10 μA, the current cannot readily be seen 
on the curve tracer.
Procedure 7: I
H(Forward and Reverse)
To measure the I
H (Forward and Reverse)
 parameter:
1. Set 
Variable Collector Supply Voltage Range
 to
 1500 Max 
Peak Volts
 (
400 V
 on 577; 
2000 V
 on 370).
2. Set 
Horizontal
 knob to a sufficient scale to allow viewing of 
trace at the required voltage level (
50 V/DIV
 for devices with 
V
BO
 range from 95 V to 215 V and 
100 V/DIV
 for devices 
having V
BO
≥
 215 V).
3. Set
Vertical
 knob to 20% of maximum holding current speci-
fied.
4. Set 
Polarity
 to 
AC.
5. Set 
Mode
 to 
Norm.
6. Set 
Power Dissipation
 to 
220 W 
(
100 W 
on 577).
7. Set 
Terminal Selector
 to 
Emitter Grounded-Open Base.
8. Set 
Left-Right Terminal Jack Selector
to correspond with 
the location of the test fixture.
WARNING: Limit test time to 15 seconds maximum.
9. Increase 
Variable Collector Supply Voltage
 until device 
breaks over and turns on. (Figure AN1006.24)
Figure AN1006.24 I
H
 = 48 mA in both forward and reverse 
directions
I
is the vertical distance between the center horizontal axis and 
the beginning of the line located on center vertical axis.
Procedure 8: V
TM(Forward and Reverse)
To measure the V
TM (Forward and Reverse)
 parameter:
1. Set 
Variable Collector Supply Voltage Range
 to 
350 Max 
Peak Volts. 
(
400 V
 on 370)
2. Set 
Horizontal
 knob to 
0.5 V/DIV.
3. Set 
Vertical
 knob to 
0.5 A/DIV.
4. Set 
Polarity
 to (+).
5. Set 
Mode
 to 
Norm.
6. Set
Power Dissipation
 to 
220 W
 (
100 W
 on 577).
7. Set 
Terminal Selector
 to
 Emitter Grounded-Open Base.
Before continuing with testing, note the following:
A Kelvin test fixture is required for this test. If a Kelvin fixture is 
not used, an error in measurement of V
TM
 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.
50
  A
50
V
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
 VBO
+VBO
+IBO
 IBO
20
mA
50
V
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
IH
IH