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circuit is a high pass filter which removes (as much as practical) the fundamental frequency. This can be a notch filter, one which passes all but the fundamental, with negligible attenuation at other frequencies (including whatever harmonics might be present). Alternatively, if the distortion products are at higher frequencies, a
486:
A distortionmeter is a level meter with two switchable parallel circuits at the input. The first circuit measures the total signal at the output of a system. (For low distortion levels this will be almost equal to fundamental). That value is adjusted to read 100% or, equivalently, to 0 dB. The second
368:
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can be used if its cutoff rate is sufficiently steep to not affect the expected distortion products. The output of the filter is measured as a percentage of the fundamental, and the reported value will be the distortion value.
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is equivalent to adding harmonics to a signal. When a purely sinusoidal signal is in this way, a series of harmonics is superimposed on the original signal, and can be detected with suitable equipment.
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125:(or more precisely distortion factor meter) is an electronic measuring instrument which displays the amount of distortion added to the original signal by an electronic circuit.
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The value of Total
Harmonics Distortion (THD) is defined as the ratio of the harmonics to the fundamental; i.e.,
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363:{\displaystyle {f_{o}}=a_{1}\cdot sin(\omega t)+a_{2}\cdot sin(2\omega t)+a_{3}\cdot sin(3\omega t)+..}
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464:{\displaystyle THD={\frac {\sqrt {{a_{2}}^{2}+{a_{3}}^{2}+..}}{a_{1}}}}
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Reference data for Radio
Engineers, Howard W.Sams & co.ITT,
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49:. Unsourced material may be challenged and removed.
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202:{\displaystyle {f_{i}}=a_{1}\cdot sin(\omega t)}
1243:Electrical and electronic measuring equipment
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109:Learn how and when to remove this message
982:Output power of an analog TV transmitter
512:
16:A measuring device used in electronics
1012:Direct-broadcast satellite television
7:
47:adding citations to reliable sources
902:Vestigial sideband modulation (VSB)
14:
23:
897:Quadrature amplitude modulation
34:needs additional citations for
1061:Television channel frequencies
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336:
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196:
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1:
1032:Digital television transition
861:Multichannel television sound
1439:Arbitrary waveform generator
1342:Transformer ratio arm bridge
1104:Field strength in free space
805:Horizontal blanking interval
1002:Superheterodyne transmitter
474:This ratio can be given in
1506:
840:Vertical blanking interval
212:The normalized output is
1485:Electronic test equipment
1444:Digital pattern generator
1337:Time-to-digital converter
1332:Time-domain reflectometer
815:Nominal analogue blanking
1134:Television interference
1007:Television receive-only
1464:Video-signal generator
1056:Microwave transmission
1022:Terrestrial television
1017:Television transmitter
977:Intermediate frequency
770:Chrominance subcarrier
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364:
203:
1490:Broadcast engineering
1292:Microwave power meter
928:Broadcast transmitter
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365:
204:
1317:Peak programme meter
1170:Zero reference pulse
1155:Field strength meter
892:Frequency modulation
800:Horizontal scan rate
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147:
43:improve this article
1109:Noise (electronics)
972:Intercarrier method
932:Transmitter station
567:broadcasting topics
134:Harmonic distortion
129:Harmonic distortion
1449:Function generator
997:Split sound system
947:Differential phase
478:or in percentage.
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360:
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1471:
1408:Spectrum analyzer
1347:Transistor tester
1277:Frequency counter
1272:Electricity meter
1262:Capacitance meter
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1124:Radiation pattern
942:Differential gain
564:Analog television
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448:
140:If the input is
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58:"Distortionmeter"
1497:
1459:Signal generator
1413:Waveform monitor
1393:Network analyzer
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1051:Frequency offset
992:Residual carrier
937:Cavity amplifier
835:Television lines
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1454:Sweep generator
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1403:Signal analyzer
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1267:Distortionmeter
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1150:Distortionmeter
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967:Frequency mixer
923:Antenna (radio)
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790:Composite video
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489:highpass filter
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123:distortionmeter
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1388:Logic analyzer
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99:September 2024
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845:White clipper
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795:Frame (video)
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688:Color systems
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525:0-672-21218-8
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60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1398:Oscilloscope
1383:Bus analyzer
1282:Galvanometer
1266:
1196:Hanover bars
1149:
987:Pre-emphasis
911:Transmission
876:Zweikanalton
780:Color killer
705:Clear-Vision
515:
485:
473:
372:
211:
139:
132:
122:
120:
105:
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1418:Vectorscope
1352:Tube tester
1322:Psophometer
1302:Megohmmeter
1165:VIT signals
1160:Vectorscope
1099:Earth bulge
1081:Propagation
1044:& bands
1042:Frequencies
825:Raster scan
765:Chrominance
755:Black level
750:front porch
1479:Categories
1432:Generation
1423:Videoscope
1312:Peak meter
1297:Multimeter
1094:Distortion
1027:Transposer
962:Dummy load
918:Amplifiers
885:Modulation
775:Colorburst
746:Back porch
508:References
69:newspapers
1362:Voltmeter
1357:Wattmeter
1287:LCR meter
1201:Sparklies
1186:Dot crawl
1179:Artifacts
1119:Path loss
1114:Null fill
1089:Beam tilt
830:Safe area
527:, p.18-12
343:ω
325:⋅
303:ω
285:⋅
263:ω
248:⋅
191:ω
176:⋅
1376:Analysis
1367:VU meter
1307:Ohmmeter
1250:Metering
1191:Ghosting
952:Diplexer
820:Overscan
785:Color TV
678:System F
674:System E
670:819-line
664:System N
660:System L
656:System K
652:System I
648:System H
644:System G
640:System D
636:System C
632:System B
628:625-line
622:System M
618:525-line
613:455-line
608:441-line
602:System A
598:405-line
593:375-line
588:343-line
583:180-line
496:See also
1327:Q meter
1257:Ammeter
1143:Testing
725:PALplus
575:Systems
83:scholar
700:NTSC-J
523:
85:
78:
71:
64:
56:
866:NICAM
854:Sound
739:Video
730:SECAM
720:PAL-S
715:PAL-M
90:JSTOR
76:books
1129:Skew
810:Luma
748:and
695:NTSC
521:ISBN
62:news
1071:VHF
1066:UHF
710:PAL
45:by
1481::
676:,
662:,
658:,
654:,
650:,
646:,
642:,
638:,
634:,
476:dB
121:A
1235:e
1228:t
1221:v
930:/
680:)
672:(
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630:(
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620:(
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600:(
556:e
549:t
542:v
455:1
451:a
446:.
443:.
440:+
435:2
428:3
424:a
418:+
413:2
406:2
402:a
393:=
390:D
387:H
384:T
358:.
355:.
352:+
349:)
346:t
340:3
337:(
334:n
331:i
328:s
320:3
316:a
312:+
309:)
306:t
300:2
297:(
294:n
291:i
288:s
280:2
276:a
272:+
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266:t
260:(
257:n
254:i
251:s
243:1
239:a
235:=
229:o
225:f
197:)
194:t
188:(
185:n
182:i
179:s
171:1
167:a
163:=
157:i
153:f
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
