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HEWLETT-PACKARD
JOURNAL
T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S
\/.»l O KJ*» A
PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA FEBRUARY, 1958
Increased Operational Simplicity In a
New DC -Several Hundred K C Oscilloscope
HE NEW -hp- Model 120A Oscilloscope Models 130A and 130BR and includes an auto
JL shown in Fig. 1 provides the engineer a matic no-signal base line feature that sub
wider equipment choice from which to match stantially simplifies set-up adjustments. The
instrumentation performance and economy to excellent phase-shift-measuring characteristics
the measuring problem without sacrificing of the Models 130A and 130BR are also pres
SEE ALSO
quality, precision or ent, although the circuitry of the amplifiers in
"New -hp- R & D convenience. The in the 120A is not identical as it is in the 130A
Arrangement," p. 6
strument has been de and 130BR.
signed for the applications that require an
AUTOMATIC BASE LINE
oscilloscope with medium-high sensitivity in SWEEP ARRANGEMENT
the vertical amplifier combined with an accu The automatic no-signal base line is de
rate, high-quality sweep system, but where signed to reduce to a large extent or even
only medium sensitivity is needed in the hori eliminate the searching with the vertical and
zontal amplifier. Specifically, the 120A has a horizontal positioning controls that is often
maximum vertical amplifier sensitivity of 10 necessary when an oscilloscope is first turned
millivolts /cm, a maximum horizontal ampli on. The arrangement is such that, when no
fier sensitivity of 100 millivolts/cm, a 5% signal is applied to the sweep circuits, a low
overall accuracy sweep system, and a response repetition-rate trace occurs. The position of the
that extends from d-c to several hundred kc base line is thus normally always known.
(Fig. 2). Further, the instrument has an even When a signal is applied, the sweep automati
simpler sweep arrangement than those on the cally triggers from the signal so that the con-
1 0 % 5 0 K C I O O K C 1 500 KC
F R E O U E N C Y
Fig. 2. Typical frequency response characteristic of Model 1 20 A.
High-frequency response spread of 20 production instruments is
shown by shaded region.
Fig. 1 (at left). New Model 120 A Oscilloscope is designed with
automatic no-signal base line feature to facilitate initial set-up
adjustments. Instrument also has special internal control which can
he used to limit range of panel intensity control and thus prevent
screen burning if sensitive-phosphor erf s are used.
P R I N T E D I N U . S . A .
C O P Y R I G H T 1 9 5 S H E W L E T T - P A C K A R D C O .