
AN1006
Application Notes
http://www.teccor.com
+1 972-580-7777 
AN1006 - 8
2002 Teccor Electronics
Procedure 2: (+)V
DRM
, (+)I
DRM
To measure the (+)V
DRM
 and (+)I
DRM
 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 
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 AN1006.11)
Figure AN1006.11 (+)I
DRM
 = 205 nA at (+)V
DRM
 = 600 V
Procedure 3: (-)V
DRM
, (-)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
TM (Forward and Reverse)
To measure the V
TM (Forward and Reverse)
 parameter:
1. Set 
Terminal Selector
 to 
Step Generator-Emitter Grounded
.
2. Set 
Step/Offset Amplitude
 to twice the maximum I
GT
 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 I
T(RMS)
 rating of the device [I
T(peak)
 on CRT].
Note the following:
Due to the excessive amount of power that can be generated in 
this test, only parts with an I
T(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 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.
Procedure 5: V
TM (Forward)
To measure the V
TM (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 I
T(peak)
, which is 1.4 times I
T(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 I
T(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 V
, follow along horizontal scale to the point where 
the trace crosses the I
 value. The distance from the left-
hand side of scale to the crossing point is the V
TM
 value. 
(Figure AN1006.12)
Figure AN1006.12 V
TM (forward)
 = 1.1 V at I
PK
 = 11.3 A (8 A rms)
Procedure 6: V
TM (Reverse)
To measure the V
TM (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 I
T(peak)
.
4. Measure V
TM(Reverse)
 similar to Figure AN1006.12, except from 
upper right hand corner of screen.
Procedure 7: I
H(Forward and Reverse)
To measure the I
H (Forward and Reverse)
 parameter:
1. Set
Step/Offset Amplitude
 to twice the I
GT
rating of the 
device.
2. Set 
Power Dissipation
 to 
10 W
.
50
nA
100
V
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
IDRM
VDRM
()k
DIV
9m
PER
DIV
500
mV
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
VTM
IPK
2
A
100
mA
20
()k
DIV
9m
PER
DIV