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