Tektronix CURVE-TRACER 576 Instruction Manual page 23

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FINE POSITION
Control (Vertical)
Controls
MAX PEAK
VOLTS Switch
PEAK POWER
WATTS Switch
Provides fine positioning of vertical
display.
Collector Supply
Selects range of VARIABLE COLLEC-
TOR SUPPLY control. Switch is loca-
ted below PEAK POWER WATTS
switch and range is indicated by white
arrow. When switch is set to 75, 350
and 1500, protective box must be used
with Standard Test Fixtures (see sec-
tion on interlock system).
Selects nominal peak power output of
Collector Supply, by selecting resist-
ance in series with Collector Supply
output. PEAK POWER WATTS is
indicated by number on transparent
switch flange appearing above white
MAX PEAK VOLTS indicator.
SERIES RESISTORS are indicated by
black indicator. PEAK POWER
WATTS switch must be pulled out to
set nominal peak power output. When
PEAK POWER WATTS switch is set,
series resistance is automatically
changed to maintain desired nominal
peak power output when MAX PEAK
VOLTS switch setting is changed.
VARIABLE COL- Allows varying of collector supply
LECTOR SUPPLY voltage within range set by MAX
Control PEAK VOLTS switch.
POLAR lTV Switch Selects polarity of Collector Supply
voltage and Step Generator output.
-(PNP)-Collector Supply voltage
and Step Generator output are
negative-going.
+(NPN )-Collector Supply voltage
and Step Generator output are
positive-going.
AC-Collector Supply voltage is
both positive- and negative-going
(sine wave); Step Generator output
is positive-going. When switch is set
to AC position, use .5X step rate
and normal mode of operation.
MODE Switch Selects mode of operation of Collector
©
Supply.
NORM-Normal Collector Supply
output is obtained.
DC (ANTI LOOP)-Collector Sup-
ply output is DC voltage equal to
peak value set by VARIABLE COL-
LECTOR SUPPLY control.
LOOPING
COMPENSATION
Control
COLLECTOR
SUPPLY RESET
Button
POWER ON-OFF
Switch
Lights
POWER Light
COLLECTOR
SUPPLY VOLT-
AGE DISABLED
Light
Controls
NUMBER OF
STEPS Switch
CURRENT
LIMIT Switch
STEP/OFFSET
AMPLITUDE
Switch
OFFSET
Buttons
Operating Instructions-Type 576
LEAKAGE (EMITTER CUR-
RENT)-Vertical sensitivity is in-
creased 1000 times. Vertical ampli-
fier measures emitter current. Col-
lector Supply mode set for DC volt-
age output.
Allows adjustment of looping compen-
sation. Allows compensation of inter-
nal and adapter stray capacitance.
Does not compensate for device ca-
pacitance.
Resets Collector Supply if it has been
disabled by internal circuit breaker.
Collector Supply is turned off when-
ever maximum current rating of trans-
former primary of 1.2 Amperes is ex-
ceeded.
Controls input power to instrument.
Lights when power is on.
Indicates Collector Supply voltage has
been disabled. Lights when Collector
Sup ply may present a potentially
dangerous voltage at its output. In
such a case, use of protective box is
required to enable Collector Supply.
Also lights when high current gen-
erated by Collector Supply or Step
Generator causes instrument to over-
heat.
Step Generator
Selects number of steps per family of
Step Generator output.
Provides current limit of the Step Gen-
erator output when voltage steps are
being produced.
Selects amp I itude per step of steps and
offset of Step Generator output.
Amplitudes within black arc represent
current steps; within yellow arc, volt-
age steps. Note caution on front-panel
when using voltage steps.
Allows offsetting of Step Generator
output using OFFSET MUL T control.
ZERO-No offset available.
AID-Allows zero step of Step Gen-
erator output to be offset as many
as 10 steps above its zero offset
level.
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