Typical Test Procedures
for Power Semiconductors |
PRESS PACK (Hockey Puck) SCRs (Thyristors |
Transistor Modules (IGBTs and Darlingtons |
 |
Set the Voltage Control
to the zero position (fully counter clockwise) before turning the
unit on. Connect the Anode, Gate and Cathode leads to the device to
be tested.
DO NOT MIX UP THE ANODE AND CATHODE LEADS OR HIGH VOLTAGE WILL BE
APPLIED TO THE GATE! |
 |
Connect
a test lead between the ground plate of the component and the GROUND
terminal on the tester.
Connect a 100 kohm resitor between the BASE and EMITTER terminals on
the tester.
DO NOT MIX UP THE COLLECTOR AND EMITTER LEADS OR HIGH VOLTAGE WILL
BE APPLIED TO THE BASE! |
 |
Place the function
switch in the PRV position and press the �TEST� button.
Slowly increase the voltage while observing the Peak Voltage and
Peak Leakage Current on the panel meters.
In a properly functioning device, the rated voltage should be
reached before the current starts to rise rapidly, (the �break-over
point�). |
 |
Place
the function switch in the PRV position and press the �TEST� button.
Slowly increase the voltage while observing the Peak Voltage and
Peak Leakage Current on the panel meters.
In most transistor modules, the current will rise immediately due to
the circuit design. |
 |
Place the function
switch in the PFV position and repeat procedure described above. |
 |
Place
the function switch in the PFV position and press the �TEST� button.
Slowly increase the voltage while observing the Peak Voltage and
Peak Leakage Current on the panel meters.
In a properly functioning device, the rated voltage should be
reached before the current starts to rise rapidly, (the �break-over
point�). |
 |
Place the function
switch in the GATE position and slowly raise the Voltage Control
while observing the �TRIGGER INDICATION� light.
If the light does not turn on, the Gate on the SCR is faulty, and
the device should be replaced. |
 |
Place
the function switch in the BASE position and slowly increase the
voltage while observing the �TRIGGER INDICATION� light.
If the light does not turn on, the Base is faulty, and the device
should be replaced.
Note: Typical turn-on voltage is 5-6 V. The current is so low in
transistor base circuit, that it will not show on the current meter. |
Rotating Rectifier Modules |
Stud Mounted Diodes |
 |
Make sure the Voltage
Control is at the zero position (fully counter clockwise) before
turning the unit on. Connect the Anode and Cathode leads to the
diode to be tested.
NOTE : Diodes only have to be tested in one direction. If the diode
is forward biased (standard), the function switch should be in the
PRV position. If the diode is reversed biased, the function switch
should be in the PFV position |
 |
Make
sure the Voltage Control is at the zero position (fully counter
clockwise) before turning the unit on. Connect the Anode and Cathode
leads to the diode to be tested.
NOTE : Diodes only have to be tested in one direction. If the diode
is forward biased (standard), the function switch should be in the
PRV position. If the diode is reversed biased, the function switch
should be in the PFV position |
 |
Place the function
switch in the PRV (PFV) position and press the �TEST� button.
Slowly increase the voltage while observing the Peak Voltage and
Peak Leakage Current on the panel meters.
In a properly functioning device, the rated voltage should be
reached before the current starts to rise rapidly, (the �break-over
point�). |
 |
Place
the function switch in the PRV (PFV) position and press the �TEST�
button.
Slowly increase the voltage while observing the Peak Voltage and
Peak Leakage Current on the panel meters.
In a properly functioning device, the rated voltage should be
reached before the current starts to rise rapidly, (the �break-over
point�). |