Electronic circuit for monitoring excessive ripple voltage on dc power lines senses voltage variations from few millivolts to maximum of 10 volts rms. Instrument is used wherever power supply fluctuations might endanger system operations or damage equipment. Device is inexpensive and easily packaged in small chassis

Davidson, J. K.

Houck, W. H.

English

NASA Technical Reports Server

June 1971	 Brief 71-10170 
S	 NASA TECH BRIEF 
Kennedy Space Center	
_i& 
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 aubscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology. Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Electronic Ripple Indicator 
An electronic circuit for monitoring excessive 
ripple voltage on dc power lines can sense voltage 
variations from a few millivolts to a maximum of 10 
volts rms. The instrument could be used wherever 
power supply fluctuations might endanger system 
operations or damage equipment. 
The ripple voltage indicator includes a self-con-
Negative DCOperating 
Voltage R7	 Input R7 
R3
10
Meter I - 
'	
0' 
)lOOmV	
4v_J
	
)	
C2 
	
R5 lv p
-4rO2 
R2
R9	 R8	 I	 R4
R6 
Range Selectoi 
Switch 
ol	 Cl	
,' 
DC	 by
Test 
Voltage 
Input
(+)
Simplified Schematic Diagram of Voltage Monitor 
tamed dc power supply, an input amplifier stage, 
and a bridge-type balance circuit which responds 
to variations in the ripple voltage. A voltmeter 
connected across the bridge circuit indicates the mag-
nitude of the ripple. 
In the test mode, resistor R7 can be adjusted 
to set the maximum voltage level, and R6 adjusted 
to zero the meter. A known magnitude of ripple 
voltage is required for calibration and adjustment of 
the ripple sensing circuit. The entire device is in-
expensive, and is easily packaged in a small chassis. 
to:	
Source: W. H. Houck and J. K. Davidson 
Technology Utilization Officer
	
	
Kennedy Space Center 
(KSC-10 162) 
Kennedy Space Center  
Category 01 
This documefct 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 
Government nor any person acting on behalf of the United States 	 will be free from privately ownedrights. 
Note: 
Requests for further information may be directed
Kennedy Space Center, Florida 32899 
Reference: B71-10170 
Patent status: 
This invention is owned by NASA, and a patent 
application has been filed. Royalty-free nonexclusive 
licenses for its commercial use will be granted by 
NASA. Inquiries concerning license rights should be 
made to: 
Patent Counsel 
Mail Code AD-PAT 
John F. Kennedy Space Center 
Kennedy Space Center, Florida 32899
https://ntrs.nasa.gov/search.jsp?R=19710000169 2020-03-17T02:25:03+00:00Z
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Electronic ripple indicator

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