HP 1740A - Page 15

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POS/NEG.
Two-position
pushbutton
switch
Mt)
0<o
O«@
O«@
O«@
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.
AC/DC.
Selects
ac
or
de
coupling
of
the
input
(EXT
@
or
@)
or
displayed
(INT
44)
or
@)
signal
to
the
trigger
circuit.
The
DC
position
must
be
selected
for
signals
below
approximately
20
Hz.
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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