Tektronix CURVE-TRACER 576 Instruction Manual page 28

Operating Instructions-Type 576
lc vs.ls
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~--~4--+~--+-~-+~--+-1--1
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·--~4--+-4--+-~-+~--+-4--4
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1--~4--+~~+-4--+~--+-4--4
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L--~-i~~~~~~~~~-+~
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Fig. 2-6. Display of I vs. V for a 1 kD resistor using various settings
of the VERTICAL and HORIZONTAL switches.
0 111-00) into the right-hand set of accessory connectors
located on the Standard Test Fixture.
15. Install a 1 k)l, 1/2 watt resistor in the diode adap-
ter.
16. Set the LEFT-OFF-RIGHT switch to RIGHT and
turn the VARIABLE COLLECTOR SUPPLY control until
a trace appears diagonally across the CRT.
17. Turn the VERTICAL switch clockwise and note
that as the vertical deflection factor decreases the slope of
the line increases (see Fig. 2-6). Turn the VERTICAL
switch counterclockwise from the 1 mA position and note
that the slope decreases. Also note that the PER VERT
DIV readout changes in accordance with the position of the
VERTICAL switch. Reset the VERTICAL switch to 1 mA.
18. Repeat step 17 using the HORIZONTAL switch
within the COLLECTOR range of the switch. The change in
slope of the trace will be the inverse of what it was for the
VERTICAL switch. Reset the HORIZONTAL switch to 1
V COLLECTOR.
19. Press the ZERO button. Note that the diagonal
trace reduces to a spot in the lower left corner of the CRT
graticule. This spot denotes the point of zero deflection of
the vertical and horizontal amplifiers. Release the ZERO
button.
20. Press the CAL button. Note that the diagonal trace
reduces to a spot in the upper right corner of the CRT
graticule. The position of this spot indicates 10 divisions of
deflection both vertically and horizontally. Release the
CAL button.
21. Press the DISPLAY INVERT button and turn the
VARIABLE COLLECTOR SUPPLY control counterclock-
wise. Note that the display has been inverted and is now
originating from the upper right corner of the CRT grati-
cule. Release the DISPLAY INVERT button.
Fig. 2-7. Type 576 Standard Test Fixture with protective box in-
stalled for safe operation.
Collector Supply
22. Turn the MAX PEAK VOLTS switch throughout its
range. Note that when the switch is in the 75, 350 and
1500 positions, the yellow light comes on.
23. While the yellow light is on, turn the VARIABLE
COLLECTOR SUPPLY control fully clockwise. Note that
the diagonal line obtained in step 16 does not appear. When
the yellow light is on, the Collector Supply is disabled.
24. Set the following Type 576 controls:
MAX PEAK VOLTS
75
VARIABLE COLLECTOR
SUPPLY
LEFT-OFF-RIGHT
Fully counterclockwise
OFF
25. Install the protective box on the Standard Test Fix-
ture as shown in Fig. 2-7.
26. Close the lid of the protective box and note that
the yellow light turns off and the red light turns on.
WARNING
The red light indicates that dangerous voltages may
appear at the collector terminals of the Standard Test
Fixture.
27. Set the LEFT-OFF-RIGHT switch to RIGHT and
turn the VARIABLE COLLECTOR SUPPLY control clock-
wise. Note that the diagonal trace appears indicating that
the Collector Supply has been enabled.
2-10
REV JUL 1985
©
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