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2
INFUT.
BNC
connector to apply external
signals to the channel A (Y) and channel
B (X) amplifier.
Impedance and coupling
are selectable
by@.
Do
not
apply
more
than 250 V (dc + peak ac) or more than
500 V p-p ac at 1 kHz or less.
POSN. Controls the vertical position of the
display.
CAL
1 V.
Provides
a
1-V_ peak-to-peak
(within
1%)
square-wave
voltage
signal
recurring
at an
approximate
rate
of 1.4
kHz
(100 mV _ peak-to-peak
when
termi-
nated in 50Q).
GROUND POST. Convenient chassis ground
connector.
Useful
to
ensure
a
common
ground with equipment under test.
POSITION.
Coarse @ and
FINE @ad-
justments position the display horizontal-
ly.
AUTO/NORM.
AUTO
sweep
mode
(push-
button out). A free running sweep provides
a bright display in the absence of a trigger
signal.
NORM
sweep
mode
(pushbutton
in)
requires an internal or external signal to
generate a sweep
and must be used if the
input frequency is less than 40 Hz.
SINGLE. Sweep occurs once with the same
triggering as in NORM.
After each sweep,
the trigger circuit must
be manually
RE-
SET@.
RESET.
Momentary pushbutton that arms
the
trigger
circuit
in
the
single-sweep
mode. After pressing RESET@,
the sweep
can
be triggered
by an
internal
or exter-
nal trigger signal or by rotating the TRIG-
GER LEVEL control @ through zero.
Reset Lamp. When lit, indicates the trigger
circuit is armed.
Lamp goes off at the end
of the sweep
and
remains
off until the
trigger circuit is again armed by pressing
the reset button.
MAIN.
Selects
main
sweep
for horizontal
display.
Sweep
rate
and
triggering
are
selected
by the main-sweep
controls @ -
®.and © -O©.
@
A VS B. Selects an X-Y mode of operation
with
channel
A
input
(Y-axis)
plotted
versus
channel
B input (X-axis).
Vertical
positioning
is
adjusted
by
channel
A
POSN@),
and
horizontal
positioning
is
adjusted by POSITION @ and FINE@.
OPTION
101. Deletes the A VS B function
and
adds
logic state display.
When
the
Model
1740A is connected to a HP Model
1607A
Logic
State
Analyzer,
pressing
STATE
DSPL @displays
a
16-word
table of 16-bit words.
MAG
X10. Magnifies the horizontal display
10 times, and expands the fastest sweep
time
to 5 ns/div,
maintaining
a sweep
accuracy within 3% at room temperature.
MAIN
TIME/DIV.
The inner knob
controls
the main-sweep rate, which is indicated by
the numbers
displayed in the knob skirt
opening. Sweep accuracy is within 2% (un-
magnified) at room temperatures.
DLY'D
TIME/DIV.
The
outer
rotating
section
selects
the
delayed-sweep
rate,
which
is indicated by the marker on the
outer knob. Sweep accuracy is the same as
with
MAIN
TIME/DIV.
An interlock
is
incorporated
so the delayed
sweep
is al-
ways
faster than the main
sweep. When
rotated out of the off position in the MAIN
mode@,
a portion
of the main
sweep
is
intensified indicating the length and delay
position of the delayed sweep with respect
to the main sweep.
SWEEP
VERNIER.
Provides continuous ad-
justment
of main
sweep
TIME/DIV
bet-
ween
calibrated
positions,
extending
the
slowest sweep to 5 s/div.
UNCAL.
Lights when
SWEEP
VERNIER
@
is out of the CAL detent position, and
indicates that the sweep is not calibrated.
TRIGGER
HOLDOFF.
Increases
the
time
between
sweeps
and
aids
triggering
on
complex displays such as digital words.
TRIGGER
LEVEL.
Selects the voltage level
on the input trigger signal where the sweep
is triggered. With external trigger signals,
the trigger
level
is continuously
variable
from +1.5 V to —1.5 V on either slope of
the input trigger signal; +15 V to —15 V in
EXT
= 10 a5} mode.
With
internal
trigger
signals, the trigger level selects any point
on the vertical waveform
displayed.
O«@
oO
0«@
O«@
O«®@
Ms BE ss)
POS/NE
that
sel
INT@)
sweep.
LF REJ
trigger s
This is
signals
nating
such as
HF REJ
trigger s
This is
signals
nating
such as
LINE.
§
REJ @
INT @®
circuit ¢
signal f
AC/DC.
below a
INT/EX'
nal vert
source {
signal |
put
for
circuit.
EXT = °
or @ ir
EXT TR
trigger
mately
mately
250 V |
1 kHz o
DELAY.
variable
MAIN'
DLY'D.
tal disp
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