Operating Information—475
A TRIG MODE
A TR IG HOLDOFF
External Trigger Input
(not labeled)
A and B Sweep
DELAY-TIME
POSITION
Determines the operating mode for
the A Trigger Circuit.
AUTO: With the proper trigger
control settings, A Sweep can be
initiated by signals that have
repetition rates above about 20
hertz and are within the fre
quency range selected by the
COUPLIN G switch. In the
absence of an adequate trigger
signal or when the trigger con
trols are misadjusted, the sweep
free-runs to produce a reference
trace.
NORM: With the proper trigger
control settings, A Sweep can be
initiated by signals that are with
in the frequency range selected
by the COUPLING switch. In
the absence of an adequate trig
ger signal or when the trigger
controls are misadjusted, there is
no trace.
SINGL SWP: After a sweep is dis
played, further sweeps cannot be
presented until the SINGL SWP
pushbutton is pressed again. The
display is triggered as for NORM
operation using the A Triggering
controls.
Provides control of holdoff time
between sweeps to obtain stable
displays when triggering on aperi
odic signals (such as complex digital
words). Variable can increase hold
off time up to at least 9 times the
setting of the TIM E /D IV switch. In
the B ENDS A position (fully
clockwise), the A sweep is reset at
the end of the B sweep to provide
the fastest possible sweep repetition
rate for delayed sweep presenta
tions.
A AND B T IM E /DIV A TIM E/D IV switch (clear plastic
AND DELAY TIM E outer flange) selects the basic delay
time (to be multiplied by the
DELAY-TIME POSITION dial set
ting) for delayed-sweep operation.
The B TIM E /D IV switch (inner
dark knob) selects the sweep rate
for A only displays or for the B
portion of a delayed sweep display.
VAR control must be in the cali
brated detent for calibrated sweep
rates.
VAR Provides continuously variable (un
calibrated) sweep rates between the
calibrated settings of the T IM E /
DIV switch. Varies the A Time Base
sweep rate in the non-delayed mode
of horizontal operation and the B
Time Base sweep rate in the
delayed sweep mode. Extends the
slowest sweep rate to at least 1.25
seconds/division. Sweep rate is cali
brated when the control is rotated
fully clockwise to the calibrated
detent.
UNCAL Light that indicates when the VAR
TIM E /D IV control is out of the
calibrated detent and the horizontal
sweep rate is uncalibrated.
X10 MAG Indicator Light that indicates when the X10
MAG is turned on.
READY Light that indicates that A Sweep
has been prepared to present a
single sweep upon receipt of an
adequate trigger signal.
HORIZ DISPLAY Selects the horizontal mode of
operation.
A: Horizontal deflection provided
by A Sweep. B Sweep inopera
tive.
Input connectors for external trig
ger signals.
Provides variable sweep delay be
tween 0.00 and 10.00 times the
delay time indicated by the
DELAY TIM E switch.
MIX: The first part of the hori
zontal sweep is displayed at a
rate set by the A TIM E /D IV
switch and the latter part of the
sweep at a rate set by the B
T IM E /D IV switch. Relative
amounts of the display allocated
to each of the two rates are
determined by the setting of the
DELAY-TIME POSITION dial.
A I N T: Displayed sweep rate deter
mined by the A TIM E/DIV
2-5
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