Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1950-02
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JOURNAL
TECHNICAL INFORMATION FROM THE HEWLETT-PACKARD LABORATORIES VOL 1 No. 6
SHED ALTO, FEBRUARY, HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA FEBRUARY, 1950
New 0.07-10 Microsecond
General-Purpose Pulse Generator
THE new -hp- 212 A generates pulses of occurrence of the major output pulse,
which have extremely good waveform however, is continuously adjustable from 10
and which are adjustable in duration over a microseconds before to 100 microseconds
range from at least 0.07 to 10 microseconds. after the occurrence of the sync out pulse.
These pulses are obtained from a circuit that Photographs of oscilloscope traces of three
has been maintained at a convenient value typical major output pulses of different du
(50 ohms) to permit ready use without de ration are shown in Figure 1 . The time of
terioration of the pulse shape in practical rise and decay of the pulses is distinguishable
loads. In other respects the -hp- 212 A has only in the photograph of the shortest pulse,
been made as flexible as possible: the maxi where the pulse width is 0.07 microsecond.
mum output voltage of 50 volts loaded or It can be seen that the rise and decay times
100 volts open circuit is sufficiently high for are each less than 0.02 microsecond.
most types of test work, an output attenua The degree of freedom from jitter is indi
tor reduces the output voltage in known cated by the sharp trace on the leading and
steps, pulses can be generated at any repeti trailing edges of the pulses in Figure 1 . These
tion rate from 50 to 5000 pps, and the circuit photographs were made from a synchroscope
can be triggered from an external synchro whose sweep was triggered from the trigger
nizing or sync in pulse. pulse generated by the -hp- 212A; that is,
In addition to the major output pulse, the the synchroscope sweep was not internally
-hp- 212 A generates a trigger or sync out synchronized. Thus, these photographs,
pulse of approximately 2 microseconds du which were exposed for a large fraction of a
ration. The time of occurrence of the sync minute, include the jitter in the trigger pulse
out pulse is fixed at 1 5 microseconds follow and the major pulse itself, as well as any
ing an input synchronizing pulse. The time jitter in the sweep circuit of the synchroscope.
(A) (B) (C)
0.07 Microsecond 1.0 Microsecond 10 Microseconds
Figure Half-Voltage Points. Pulses Generated by -hp- Model 212A. Pulse Lengths Are Measured at Half-Voltage Points.
P R I N T E D I N U S A . C O P Y R I G H T 1 9 5 0 H E W L E T T - P A C K A R D C O .
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