
AN1006
Application Notes
http://www.teccor.com
+1 972-580-7777 
AN1006 - 4
2002 Teccor Electronics
Thyristor Product Catalog
Power Rectifiers
The rectifier is a unidirectional device which conducts when for-
ward voltage (above 0.7 V) is applied.
To connect the rectifier:
1. Connect 
Anode
 to 
Collector Terminal (C)
.
2. Connect 
Cathode
 to 
Emitter Terminal (E)
.
To begin testing, perform the following procedures.
Procedure 1: V
RRM
 and I
RM
To measure the V
RRM
 and I
RM
 parameter:
1. Set 
Variable Collector Supply Voltage Range
 to 
1500 V.
(
2000 V
 on 370)
2. Set 
Horizontal
 knob to sufficient scale to allow viewing of 
trace at the required voltage level (
100 V/DIV
 for 400 V and 
600 V devices and 
50 V/DIV
 for 200 V devices).
3. Set 
Mode
 to 
Leakage.
4. Set 
Vertical
 knob to 
100 μA/DIV. 
(Due to leakage setting, the 
CRT readout will be 100 nA per division.) 
5. Set 
Terminal Selector
 to 
Emitter Grounded-Open Base.
6. Set 
Polarity
 to (–).
7. Set 
Power Dissipation
 to 
2.2 W. 
(
2 W
 on 370)
8. Set 
Left-Right Terminal Jack Selector
 to correspond with 
location of test fixture.
9. Increase 
Variable Collector Supply Voltage
 to the rated 
V
RRM
 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 AN1006.2)
Figure AN1006.2
 I
RM
= 340 nA at V
RRM
 = 600 V
Procedure 2: V
FM
Before 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 VFM will result due to 
voltage drop in fixture. If a Kelvin fixture is not available, 
Figure AN1006.3 shows necessary information to wire a test 
fixture with Kelvin connections.
Due to the current limitations of standard curve tracer 
model 576, V
FM
 cannot be tested at rated current without a Tek-
tronix model 176 high-current module. The procedure below is 
done at I
T(RMS)
 = 10 A (20 A
PK
). This test parameter allows the 
use of a standard curve tracer and still provides an estimate of 
whether V
FM
 is within specification.
Figure AN1006.3
Instructions for Wiring Kelvin Socket
To measure the V
FM
 parameter:
1. Set 
Variable Collector Supply Voltage Range
 to 
15 Max 
Peak Volts
. (
16 V
 on 370)
2. Set 
Horizontal
 knob to 
0.5 V/DIV
.
3. Set 
Mode
 to 
Norm
.
4. Set 
Vertical
 knob to 
2 A/DIV
.
5. Set 
Power Dissipation
 to 
220 W
 (
100 W
 on 577).
6. Set 
Polarity
 to
(+).
7. Set 
Left-Right Terminal Jack Selector
 to correspond with 
location of test fixture.
8. Increase 
Variable Collector Supply Voltage
 until current 
reaches 20 A.
WARNING: Limit test time to 15 seconds maximum. 
To measure V
FM
, follow along horizontal scale to the point where 
the trace crosses the 20 A axis. The distance from the left-hand 
side of scale to the crossing point is the V
FM
 value. 
(Figure AN1006.4)
Note: Model 370 current is limited to 10 A.
VRRM
IRM
100
nA
100
V
PER
V
E
R
T
DIV
PER
H
O
R
I
Z
DIV
PER
S
T
E
P
()k
DIV
9m
PER
DIV
SOCKET
SOCKET PINS
One set of
pins wired to
Collector (C),
Base (B), and
Emitter (E)
Terminals
The pins which correspond to
the anode and cathode of the
device are wired to the terminals
marked C
SENSE
 (MT2/Anode) and
E
SENSE
 (MT1/Cathode). The gate
does not require a Kelvin
connection.
Socket used
must have two
sets of pins