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that selects the slope of the (EXT @ or
INT@)
trigger
siganl
used
to start
the
sweep.
:
LF REJ.
Attenuates
internal
or external
trigger signals below approximately 4 kHz.
This is useful to condition
high-frequency
signals
for best synchronization
by elimi-
nating
unwanted
high-frequency
signals
such as power line interference.
HF
REJ.
Attenuates
internal
or external
trigger signals above approximately 4 kHz.
This
is useful
to condition
low-frequency
signals
for best synchronization
by elimi-
nating
unwanted
high-frequency
signals
such as RF.
LINE. Selecting both LF REJ @ and HF
REJ Q removes"
all
EXT (44) input
or
INT © displayed
signals from the trigger
circuit and applies a power-line frequency
signal for triggering.
INT/EXT. INT selects a sample of the inter-
nal vertical signal chosen by the TRIGGER
source @ or@,
while
EXT
selects
the
signal at the EXT TRIGGER
@ or @ in-
put for application
to the main
trigger
circuit.
EXT = 10. Attenuates EXT TRIGGER
@
or 56) input signal by a factor of 10.
EXT TRIGGER. BNC connector for external
trigger input. Input impedance
is approxi-
mately one megohm
shunted by approxi-
mately
20 pF. Do
not apply more
than
250 V (de + peak
ac) or 500 V p-p ac at
1 kHz or less.
DELAY.
The
DELAY
control
provides
a
variable
delay
time
from
0.5 to 10X
the
MAIN
TIME/DIV
settings of 100 ns to 2s.
DLY'D. Selects delayed sweep for horizon-
tal display.
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e
6
© 8©0C
66
Model
1740A
MIXED.
Selects main and delayed sweeps
for the horizontal display. The first portion
of the sweep
is at the main
sweep
rate,
and
the
second
portion
of the
sweep
(starting
point
chosen
by DELAY
@) is
at the delayed-sweep rate.
SWEEP AFTER DELAY AUTO/TRIG. Selects
the method
of starting the delayed-sweep
when
in
main
intensified,
delayed,
or
mixed
mode
operation.
In AUTO,
delayed
sweep
starts
immediately
after the delay
interval,
which
is the product
of the DE-
LAY @dial
reading
(div) and the main
TIME/DIV @ reading. In TRIG, the de-
layed-trigger
circuit
is
armed
after
the
delay interval
and delayed sweep must be
triggered by either an internal or external
trigger signal.
Z-AXIS
INPUT.
BNC
connector
for inten-
sity
modulation
of the
CRT
display.
A
+4-volt, 250-ns
width
pulse blanks
a trace
of any intensity.
Do not apply more
than
+20 V (de + peak ac).
TRACE
ALIGN. Screwdriver adjustment to
align the horizontal trace with the grati-
cule.
ASTIGMATISM.
Screwdriver
adjustment
used in conjunction with FOCUS
@ to
achieve a clean, sharp spot or trace. Ad-
justinent is easier with a stationary spot.
LINE INPUT. Connector for the power cord.
MAIN
GATE
OUTPUT.
Provides
a rectan-
gular
output
of
approximately
+2.5
V
coincident with the main gate.
DLY'D GATE
OUTPUT.
Provides a rectan-
gular
output
of
approximately
+2.5
V
comcident with the delayed gate.
1607A INPUTS. Option 101 only.
HORIZ.
X-axis
1607A.
input
from
HP
Model
VERT. Y-axis input from HP Model 1607A.
Z-AXIS.
Intensity
input from
HP
Model
1607A.
FUSE.
| A 250
V SLO-BLO
for 100-V
or
120-V operation. 0.5 A 250 V SLO-BLO for
220-V or 240-V operation.
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