Page 5 - 1961 , Volume v.12 n.9 , Issue May-1961

P. 5

Fig. 9. New 1,2-megacycle and 300-kilocycle counters in col Fig. 10. Circuitry in new counters is built in plug-in modules.
umn-readout versions.

I N - L I N E A N D type arranged behind a light-polar familiar column-type readout using
C O L U M N R E A D O U T S izing window which greatly reduces neon lamps. In the new arrange
Each of the new counters has been reflections from internal surfaces ment (Fig. 8) the numerals in each
s
t
designed with two styles of readout and thus provides high contrast for column have been taggered o
systems. One is the popular in-line ease of viewing. achieve a shorter vertical dimension
style shown in Fig. 1. This style uses The second readout style is a for the column. As a result the ver
l"-size NixieÂ® tubes of the long-life newly-designed arrangement of the tical span over which the eye must

D I G I T A L O R A N A L O G R E C O R D I N G O F C O U N T E R
MEASUREMENTS
Two useful output devices for ob Printing is accomplished with a M O D E L 5 8 0 A D I G I T A L - A N A L O G
taining records of counter readings or mechanism similar to that of the -hp- CONVERTER
other digital data are the -hp- 562A 560A and 561B Digital Recorders by
Digital Recorder and the -hp- 5 80 A striking a print bar against preposi- This converter is designed to accept
Digital-Analog Converter. Although tioned print wheels. Each print wheel digital input data, such as is available
designed primarily for use with the representing an input digit has asso from the new -hp- counters, and pro
new family of -hp- transistor counters, ciated with it a printed circuit module vide an analog output suitable for strip
Models 562A and 580A are extremely containing the circuitry needed for chart or X-Y recorders of both poten
flexible and can be used in a wide va tiometer and galvanometer types. Any
riety of individual applications. Out data storage and for selecting the three successive digits for analog con
put kits are available for -hp- and proper print wheel position for that version may be chosen by the front
Dymec vacuum tube counters. particular column. These modules are panel selector switch. This information
arranged in the standard recorder is transferred to storage flip-flops
configuration to accept the 1-2-2-4 within the 580A after receipt of the
weighted BCD code as provided by counter print command. The stored
the new -hp- counters discussed in this data is then translated and weighted
article. Modules for other codes may to provide the proper analog output
also be obtained. voltage or current.
Internal plug-in connectors are pro
vided for each of the columns. These
connectors are readily accessible and
provide the means for routing the in
put information to any desired se
quence of print wheels.
Another important feature of the
562A Digital Recorder is the provision
for dual input coupling. At a small
M O D E L 5 6 2 A D I G I T A L R E C O R D E R
additional cost, another rear input
This 1 1-column digital recorder will connector may be added to the instru
print a paper tape record of digital ment to permit data entry and simul Since input data is stored and
input data at rates up to five lines per taneous printing from two unsyn- changes only when the input changes,
second. Unlike other recorders which accuracy of conversion is maintained
must inhibit the driving source during chronized counters or other sources. at high sample rates. Specified accu
the print cycle to prevent a change in An analog voltage, similar to that racy is 0.5% full scale or better with
input data, Model 562A makes use of provided by the -hp- Model 580A dis a resolution of 0.1% full scale.
input flip-flops for buffer storage. Be cussed below is also an available op Since the data in three successive
cause of this, data transfer can be tion for the 562A Digital Recorder. columns can range only from 000 to
i
accomplished in just 2 ms as compared The standard Model 562A s 999, automatic zero-shifting is inher
to 160 ms or more for non-storage equipped for six-column operation ent in Model 5 80 A output, which
printers. from one input source. keeps the record on scale at all times.

1 2 3 4 5 6