Tektronix SC 502, Instruction Manual

Page: 21 / 127

OperaUnglnstruettons-SC 502
24
TRIGGER VIEW Pushbutton. Causes the sweep
triggering signal to be displayed on the
crt.
MODE Switch. Selects the vertical amplifier
mode of operation and turns the instrument on
and off.
PWR OFF. The internal instrument power is
off.
CH
1.
Channel
1
is displayed.
CH 2. Channel 2 is displayed.
ALT. Dual trace display
of
both channels.
Display is switched between channels at the
end of each sweep. Generally used for sweep
speeds above
1 ms/cm.
CHOP. Dual trace display of both channels.
Display is switched between the channels
at
�250
kHz. Generally used for sweep speeds
below 1 ms/cm.
CH
1
MINUS CH
2.
The input
of
channel
2
is
inverted and algebraically added to channel
1.
CH 1 and CH 2 POSITION. Controls the vertical
position of the displayed signals.
VOLTS/DIV Switch. Selects the vertical deflec­
tion factor in a
1-2-5
sequence. The variable
control (CAL) must be fully
cw
for the indicated
deflection factor. Read the deflection factor over
the lightly shaded area when using a
1X probe.
Read the deflection factor over the grey area
when using a
lOX probe.
CAL Variable Control. Provides variable un­
calibrated deflection factors between the
calibrated settings of the VOL TS/DIV switch.
Input Connector. Bnc connector for applying
vertical input signal.
AC-GND-DC Switch. Selects the vertical
amplifier input coupling. In the AC position,
Signals are capacitively coupled to the vertical
amplifier, blocking the de component of the
signal. In the GND position, the input of the
vertical amplifier is disconnected from the input
connector and grounded. This allows precharg­
ing of the input coupling capacitor. In the DC
position, all components of the Input Signal are
passed to the input amplifier.
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Calibrator
Jack.
Provides a positive going
0.6
V
square wave at twice the line frequency for
calibration of gain and probe compensation.
POSITION control. Positions the display
horizontally on the crt.
EXT TRIG/AMPL. External input connector for
horizontal amplifier or for external trigger Signal.
The external amplifier ac-dc coupling is con­
trolled by the trigger AC pushbutton.
CAL (Variable)/PULL Xl0 SWP MAG. The CAL
control provides continuously variable sweep
rates between the calibrated settings of the
SECONDS/DIV switch or when sele,c;:ted by an
internal jumper. provides a variable trigger
holdoff time.
When the CAL knob is pulled out. the displayed
sweep rate/division is increased by a factor of ten.
SECONDS/DIV Switch, Selects the horizontal
sweep rate or the AMPL mode for an external
input to the horizontal amplifier. The VARiable
control must be fully
cw
for
calibrated sweep
rates. The light shaded area under the knob skirt
indicates the unmagnified sweep rate. The
colored area at
10
o'clock shows the magnified
sweep rate.
TRIG'D READY Indicator. Thelight indicates that
the Single sweep is armed or that the sweep is
triggered.
POWER Indicator. The light indicates that the
SC 502 power is turned on.
RESET Pushbutton. Push to arm the sweep in
single sweep operation.
®
Trigger Mode Pushbuttons.
AUTO Pushbutton In. The Sweep free runs
and provides a reference trace when there is
no adequate triggering Signal.
AUTO Pushbutton Out. The sweep is initiated
by the applied trigger signal. When there is no
adequate triggering signal, there is no trace.
SINGLE SWP Pushbutton In. When this
pushbutton is in and the AUTO pushbutton is
@ MAY 1980