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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
PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA AUGUST, 1962
A DC -500 KG Oscilloscope
with Extended Measurement Capabilities
IN THE day-to-day use of present oscillo character indeed. The sensitivity in the vertical
scopes, it is interesting to recall the enor and horizontal amplifiers is each 200 micro
mous advances that have occurred in general- volts/cm, while the bandwidth of each extends
purpose oscilloscopes in just a few years' time. beyond 500 kc at the high end and to dc at the
Prior to the introduction of the Hewlett-Pack low end. The sweep circuit is of the -hp- auto
ard Model 130 Oscilloscope in 1956*, for ex matic type which gives automatic triggering
ample, typical general-purpose oscilloscopes from a viewed signal and, in the absence of a
were decidedly limited in their measurement signal, automatically displays a base line as a
capabilities. Usually, they had a low sensitivity convenience in general measurement work.
in the order of a tenth of a volt, while their The sweep system also has the capability for
frequency ranges or effective bandwidths were single sweeping and includes a magnifier that
expressible in tens of kilocycles. Sweep circuits gives up to X50 magnification. The overall
were normally of the synchronizing rather design includes many other measuring con
than triggered types and were rather incon veniences such as identical vertical and hori
venient to use. Accuracies on important char zontal amplifiers, an amplitude calibrator, and
acteristics were low. the -hp- internal-graticule cathode-ray tube.
By contrast, the new "C" version of the -hp-
Model 130 Oscilloscope shown below has *Duane Dunwoodie and Dick Reynolds, "A New DC-300 KC High-
Sensitivity Oscilloscope with Triggered Sweep," Hewlett-Packard Jour
measurement capabilities of a very advanced nal, Vol. 7, No. 7, March, 1956.
Fig. 1. New -hp- Model HOC Oscilloscope has a high Fig. 2. Several capabilities of new oscilloscope are dem
sensitivity of 200 microvolts/ cm and many conveniences onstrated by above oscillogram of modulated carrier of
regular a-m broadcast station. Oscillogram u-as made at
to permit measurements to be made in presently-difficult -hp- using short tuned antenna connected to scope input.
situations. Scope uses new -hp- internal-graticule cathode- Carrier frequency is about 700 kc. Scope's single-siveep
ray tube which avoids mirroring and parallax. feature was used to permit single trace tobe photographed.
C O P Y R I G H T 1 9 6 2 H E W L E T T - P A C K A R D C O .
P R I N T E D I N U . S . A .