Tektronix CURVE-TRACER 576 Instruction Manual page 43

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OR EMIT INPUT connector. When the Terminal Selector
switch is set to BASE TERM SHORT, the base terminal is
shorted to the emitter.
In the BASE GROUNDED range, the base terminal is
connected to ground and the Terminal Selector switch de-
termines the state of the emitter terminal. With the switch
set to STEP GEN, the Step Generator output is inverted and
applied to the emitter terminal. When the switch is set to
OPEN (OR EXT) the emitter terminal is left open. In this
case, measurements may be made with the emitter terminal
left open or with an externally generated signal applied to it
through the EXT BASE OR EMIT INPUT connector.
Devices to be tested are connected to the Type 576
through
1 0
accessories connectors provided on the Stan-
dard Test Fixture. These connectors allow two devices to
be set up at a time for comparison testing. The LEFT-OFF-
RIGHT switch determines which device is under test.
Tektronix Type 576 test fixture adapters may be plugged
into the
1 0
accessories connectors. These adapters provide
sockets into which devices with various lead arrangements
may be placed for testing. Table 2-7 lists the test fixture
adapters available and their uses. The 10 accessories con-
nectors also accept standard banana plugs so that a device
may be connected to the Type 576 without using a specific
device testing accessory.
The unlabeled accessories connectors allow Kelvin sens-
ing of voltages measured under high current conditions. Kel-
vin sensing means that current is supplied to a device under
test through one set of contacts and the voltage is mea-
sured through another set of contacts. This method of sens-
ing voltage eliminates errors in voltage measurements due
to contact resistance. The upper unlabeled accessories con-
nectors on the Standard Test Fixture are used for sensing
collector voltage and the lower connectors are for sensing
emitter voltage.
Conduction of high current through a voltage sensing
connector will damage the instrument. When using
Kelvin sensing without a special test fixture adapter,
separate leads are required for current carrying and
for voltage sensing.
The STEP GEN OUTPUT connector allows the Step
Generator output to be used externally. The EXT BASE OR
EMIT INPUT connector allows application of an externally
generated signal to either the base or the emitter of the
device under test by selection with the Terminal Selector
switch. The GROUND connector provides a Type 576
ground reference for signals generated or externally applied
to the Type 576.
REV JUL
1985
Operating Instructions-Type 576
Polarities of the Collector Supply and Step Genera-
tor Output
Table 2-8 shows the polarities of the Collector Supply
and the Step Gnerator output for various settings of the
Collector Supply POLARITY switch and the Terminal Selec-
tor switch.
TABLE 2-7
Test Fixture Adapters
1
Tektronix Devices Tested Case Types
Ar
Part
Number
;
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013-0072-00
2
Diodes Axial lead
013-0098-02 Transistors
T0-18,
and P-Channel T0-5 and related sizes
FET's
013-0099-02 N-Channel T0-18,
FET's T0-5 and related sizes
013-0100-01 Transistors T0-3;
and SCR's provides Kelvin sensing
013-0101-00 Transistors T0-66;
and SCR's
provides Kelvin sensing
013-01 02-00
2
Transistors long lead devices
Rnd P-Channel
- r1 ' ' • C:
FET's
0 13-01 03-00
2
N-Channel long lead devices
FET's
~
:. ; to
6
'6
013-0110-00 Diodes Stud leads; D0-4/D0-5;
Kelvin sensing
013-0111-00 Diodes
Axial leads;
Kelvin sensing
013-0112-00
2
Transistors T0-36; Kelvin sensing
and SCR's
013-0124-03
2
Integrated multipin device
circuits
packages; sockets
available for 8, 10,
14, 16 pins
013-0127-01
2
Transistors Can be rewired for
different configurations
013-0138-01 In-line transis- B-C-E configuration;
tors and volt- can be rewired for other
age regulators configurations; Kelvin
sensing
013-01 63-00
2
Power Tran- Kelvin sensing
sistors
1
Some of these accessories are made of plastic and are sus-
ceptible to damage from excessive heat. If a device is likely to
heat excessively, a heat sink for the device or the pulsed steps
mode of operation should be used.
2
0ptional accessory.
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2-25
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