Scientific 5000 Series, Manual

Page: 35 / 360

1 - OVERVIEW
MODEL 5000 SERIES MANUAL
Version 1.23
1-5
1.3 Front Panel Description
1.3.1 Front Panel Nomenclature
SCR A G K
Triac MT2 G MT1
Transistor C B E
PWR MOS FET D G S
Diode A K
Zener A K
Table 1-1 Front Panel Nomenclature
1.3.2 Load Resistors
Load resistors R
L
, R
GS
and R
GK
are used in certain tests. When programming these
tests, the operator will select one of the available internal load values or the external
load. The external load is attached between the appropriate pair of labeled jacks in
the 5000 Series Tester front panel. The load is switched into the circuit only when
required by a particular test; other tests that do not call for the load are not affected.
The nomenclature of these load resistors may change from one device type to
another, for example R
GK
for an SCR becomes R
BE
for a transistor.
The jacks labeled ANODE NET and GATE NET are used with special programming
to attach networks from anode to gate and gate to cathode for special applications.
1.3.3 Device Test Jacks with Kelvin Sense Leads
The device lead jacks are labeled A, G and K. Each of the device leads has a
corresponding Kelvin sense lead labeled A
S
, G
S
and K
S
. Kelvin sense leads are used
to compensate for any voltage drop due to cable length. In order to provide 50 amps
at 4 volts at the end of a 6-foot cable, the test system may have to drive 8 volts. Be
sure to connect the sense leads as close to the device under test as possible.
1.3.4 Device Fixture
Fixtures are available for many device package types. The 5000 Series Tester is
shipped with one in-line fixture. The fixtures are self-orienting and will plug into the
5000 Series Tester front panel only one way. Observe the fixture labeling for device
orientation.
Other fixtures or leads may be used to attach the device so long as connections are
properly made to the device. Consult the factory for special cable or fixture
requirements.
DEVICE LEADS SHOULD NEVER BE TIED OR
REFERENCED TO ANY EQUIPMENT GROUND!