Model 141A
SECTION
I
GENERAL INFORMATION
Section
I
Paragraphs
1-1
to
1-11
1-1.
DESCRIPTION.
1-2. The
hp
Model 141A, Figure
1-1,
is
aconventional,
general purpose Oscilloscope with the added features
of variable persistence (duration of trace afterglow)
and storage of CRT displays. Persistence
is
variable
from 0.2 to more than 60 seconds;
a
display may be
stored (at reduced intensity) for more than
1
hour
or
displayed at normal intensity for up to
1
minute.
Stored displays can be erased in 100 milliseconds.
1-3. Variable persistence
is
especially useful for
viewing slow-sweep signals. The persistence of the
signals from electrocardiograms
or
other bio-chemical
phenomena can be adjusted to provide a complete trace,
yet to fade fast enough to prevent interference with the
next trace. Display persistence of swept frequency
and time domainreflectometry measvrement readouts
can be adjusted to eliminate flicker and still provide
high resolution.
1-4. The storage feature of the Model 141A
can
be
used to store single-shot waveforms and to later view
or
photograph the phenomena. Comparison of wave-
forms can be accomplishedby storing several displays
separately
and
then viewing them simultaneously.
1-5.
plug-inunits. Amplifiers withbandwidths up to 20 MHz*
The Model 141A accepts
all
hp
Model 1400-series
and sensitivities to 10 microvolts per centimeter
are
available
as
well
as
time domain reflectometry and
swept frequency indicator units. Complete specifica-
tions for the Model 141A Oscilloscope
are
given in
Table
1-1.
1-6.
CATHODE RAY TUBE-
1-7. The Model 141A uses an internal graticule, P31
aluminized phosphor CRT with additional internal
elements to provide the variable persistence and stor-
age features. The tube
is
equipped with
a
nonghre
safety face plate and the internal graticule eliminates
parallax error in observing the display.
1-8.
CRT WARRANTY.
1-9. The CRT used in the Model 141A
is
covered by
a
warranty separate from the instrument warranty.
The CRT warranty
is
included in the back of this man-
ual for use in the event of CRT. failure during the war-
ranty period listed thereon.
1-10.
ASSOCIATED EQUIPMENT.
1-11.
Some of the plug-ins available for
use
with the
Model 141Aare listed in Table 1-2.
The Model141A
is
normally operated with
a
vertical plug-in in the
lower compartment and
a
horizontal plug-in in the
upper compartment.
Both
plug-in compartments
are
\'
__--
Figure
1-1.
Model 141A~Oscilloscope
*This manual incorporates the name hertz, abbreviated Hz,
as
the
unit
for
frequency.
02567-
1
1-1
To Next Page
Loading...
