Test device, consisting of a pulse generator section and a manual program section, checks and calibrates digital recorder-printers. It is adaptable to other recorder configurations

Wilson, W. C.

English

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NASA TECH BRIEF 
n
June 1970	 Brief 70-10149 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Testing Device for Verifying the Performance of Digital Recorders 
Figure 1. Pulse Generator Section 
To verify that paper-tape digital recorder-printers 
of one particular model perform to specifications, a 
test device has been constructed for accurate checking 
and calibration. 
The test set consists of two units, a pulse generator 
section and a manual program section. The pulse 
generator section shown in Figure I, contains a vari-
able rate multivibrator, Q  - Q2, a variable width pulse 
shaper, Q3 - Q4; and output amplifiers for print-
command and data-program signals, Q5 and Q6 
respectively. The manual section, shown in Figure 2, 
contains an amplitude control for the data output, a 
12-position switch for selecting the proper test integers, 
and a switch which permits manual operation of the 
instrument. Power to the test set is supplied from the 
negative bias supply of the recorder being tested. 
The advantages of this device over existing systems 
are that it permits accurate performance verification 
(continued overIea 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
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with a single test unit, and can be used for both in-
place and bench calibration. Also, the device reduces 
the time required for test setup, and is adaptable to 
Figure 2. Manual Control Section
certain other recorder (electrical and mechanical) 
configurations. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Kennedy Space Center 
Kennedy Space Center, Florida 32899 
Reference: TSP70-10149 
Patent status: 
No patent action is contemplated by NASA. 
Source: Worley C. Wilson of 
The Boeing Company 
under contract to 
Kennedy Space Center 
(K SC- 10300)
. 
Brief 70-10149	 'Category 01


Testing device for verifying the performance of digital recorders

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