Tektronix CURVE-TRACER 576 Instruction Manual page 39

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Operating Instructions- Type 576
TABLE 2-4
Measurements Made by the Type 576 Display
Switch Settings
Measured by Display
VERTICAL HORIZONTAL Terminal Selector Vertically Horizontally
COLLECTOR COLLECTOR EMITTER GROUNDED
lc VeE
COLLECTOR BASE EMITTER GROUNDED
lc
VBE
COLLECTOR STEP GEN EMITTER GROUNDED
lc Is
or
VBE
COLLECTOR COLLECTOR BASE GROUNDED
lc Vcs
COLLECTOR BASE BASE GROUNDED
lc
VEB2
COLLECTOR STEP GEN BASE GROUNDC.D
lc Is
or
VEB2
EMITTER COLLECTOR EMITTER GROUNDED
IE
VcE 1
EMITTER COLLECTOR BASE GROUNDED Is
Vcs 1
STEP GEN
COLLECTOR EMITTER GROUNDED
Is
or
VsE
VeE
STEP GEN
BASE EMITTER GROUNDED
Is
or
VBE VsE
STEP GEN COLLECTOR
BASE GROUNDED
Is
or
VsE Vcs
STEP GEN
BASE BASE GROUNDED
Is
or
VEB2
VEB2
1
Error in voltage must he calculated. See Horizontal Measurements in Dcflectim1 Factor section.
2y . d.
EB
tn
•cates a measurement of forward voltage base-emitter, with the horizontal voltage sensing leads reversed.
Fig. 2-22. Output of Collector Supply for three settings of PO-
LARITY switch.
allows continuous voltage variation of the peak voltage
within each peak voltage range.
The PEAK POWER WATTS switch, which interlocks
with the MAX PEAK VOLTS switch, determines the maxi-
mum power output of the Collector Supply. Power output
is controlled by placing a resistor, selected from tho
SERIES RESISTORS, in series with the Collector Supply
output. The series resistance limits the amount of current
which can bo conducted by the Collector Supply. In setting
©
tho peak power output using tho PEAK POWER WATTS
switch, tho proper series resistor is automatically selected.
If the peak voltage range is changed while tho MAX PEAK
VOLTS and the PEAK POWER WATTS switches aro inter-
locked, a new series resistor is chosen which will provide
the same peak power output.
The Collector Supply POLARITY switch determines the
polarity of the Collector Supply output and the Stop
Generator output. It also provides an initial display position
on the CRT graticule as discussed in the section on posi-
tioning. When the POLARITY switch is set to +(NPN) tho
Collector Supply output is a po.sitivo-going full wave recti-
fied sine wave and tho Stop Generator output is positive-
going. When the switch is sot to -(PNP) the Collector Sup-
ply output is a nogativo-qoinq full wave rectified sine wave
and the Step Generator output is also negative-going. The
AC position of tho POLARITY switch provides a Collector
Supply output which is an unroctified sine wave, and the
Step Generator output is positive-going. A negative-going
Step Generator output can bo obtained in this case by
pressing the STEP/OFFSET POLARITY INVERT button.
As noted on the front panel, when the AC position is being
used, the MODE switch should bo set to NORM and the
Step Generator rate to .5X.
2-21