AN1006
Application Notes
•
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 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
Procedure 5: VTM (Forward)
To measure the VTM (Forward) parameter:
1. Set Polarity to (+).
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)
2. Set Left-Right Terminal Jack Selector to correspond with
location of test fixture.
PER
V
50
nA
E
R
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.
T
DIV
PER
H
O
100
V
R
Note: Model 370 current is limited to 10 A.
I
Z
DIV
WARNING: Limit test time to 15 seconds maximum. After
PER
S
the Variable Collector Supply Voltage has been set to IT(peak)
,
T
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.
E
P
V
DRM
I
DRM
()k
DIV
9m
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)
PER
DIV
Figure AN1006.11 (+)IDRM = 205 nA at (+)VDRM = 600 V
Procedure 3: (-)VDRM, (-)IDRM
PER
V
2
E
To measure the (-)VDRM and (-)IDRM parameter:
1. Set Polarity to (–).
R
A
T
DIV
PER
H
2. Repeat Procedures 1 and 2. (Read measurements from
O
500
mV
upper right corner of the screen.)
R
I
V
TM
Z
DIV
Procedure 4: VTM (Forward and Reverse)
To measure the VTM (Forward and Reverse) parameter:
1. Set Terminal Selector to Step Generator-Emitter Grounded.
PER
S
100
mA
T
E
P
I
PK
()k
DIV
9m
PER
DIV
2. Set Step/Offset Amplitude to twice the maximum IGT rating
20
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)
Figure AN1006.12 VTM (forward) = 1.1 V at IPK = 11.3 A (8 A rms)
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.
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)
.
11. Set Step/Offset Polarity to non-inverted (button extended;
4. Measure VTM(Reverse) similar to Figure AN1006.12, except from
upper right hand corner of screen.
on 577 button depressed).
12. Set Vertical knob to a sufficient setting to allow the viewing
Procedure 7: IH(Forward and Reverse)
of 1.4 times the IT(RMS) rating of the device [IT(peak) on CRT].
To measure the IH (Forward and Reverse) parameter:
Note the following:
1. Set Step/Offset Amplitude to twice the IGT rating of the
•
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.
device.
2. Set Power Dissipation to 10 W.
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AN1006 - 8
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