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notch

English translation: a very brief, steep drop in the voltage

13:57 Dec 6, 2005
English language (monolingual) [PRO]
Tech/Engineering - Electronics / Elect Eng / lighting
English term or phrase: notch
Through research, XXX has identified six different types of power line anomalies and their typical causes.
- High-frequency noise
- Impulse noise
...
- Notches and low-frequency noise

...notches?? to me a notch is a groove, a small slot... what has it got to do with this subject?
Elena Ghetti
Italy
Local time: 06:51
Selected answer:a very brief, steep drop in the voltage
Explanation:
The comment about notch filters is fine, but in your context, I think the author is specifying a very short, steep drop in voltage. Shown on an oscilloscope, this may look like a groove taken out of the standard sine wave, like a "one-toothed" bite from the sine wave. It may repeat or not, but I suspect it does if they are seeking to solve this as a problem.

See the link for a picture.

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Note added at 2 hrs 6 mins (2005-12-06 16:03:30 GMT)
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After looking at the picture, I want to raise my confidence in this to *5*
Selected response from:

jccantrell
United States
Local time: 21:51
Grading comment
many thanks to you and Jo Macdonald, you have both been very helpful
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
3 +9See comment
Jo Macdonald
4 +2a very brief, steep drop in the voltage
jccantrell


  

Answers


10 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +9
See comment


Explanation:
A notch filter is used to suppress power line noise

I can’t understand this being an anomaly, more a solution to an anomaly.

http://www.google.it/search?hs=fmc&hl=it&client=firefox-a&rl...


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Note added at 11 mins (2005-12-06 14:08:55 GMT)
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Found something else

Notch: similar to a dropout though typically too fast to see. They can be up to several milliseconds in duration and usually come in pairs. For every notch there is usually an immediate spike following behind. A notch is simply an out-of-phase impulse, (see impulse below).

http://www.google.it/search?hs=fmc&hl=it&client=firefox-a&rl...

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Note added at 13 mins (2005-12-06 14:10:39 GMT)
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And here:

Notch - An under voltage impulse similar to a spike but of reverse polarity to the instantaneous value of the AC sine wave so as to take a momentary notch out of the sine wave. Notches are typically too fast to see. These typically last as long as spikes but can be up to several milliseconds. In addition, spikes and notches usually come in pairs or in an oscillating series. For every notch there is usually an immediately following spike due to power line inductances and capacitances.

http://www.kerchner.com/electrical/powerline.htm


Jo Macdonald
Spain
Local time: 06:51
Specializes in field
Native speaker of: English

Peer comments on this answer (and responses from the answerer)
agree  Ken Cox: yep - a very short interruption of the supply voltage
10 mins
agree  Romanian Translator (X)
10 mins
agree  DarekS: https://www.maxim-ic.com/appnotes.cfm/appnote_number/733
11 mins
agree  Nikos Mastrakoulis: yes, a momentary voltage 'dip' or 'plunge'
36 mins
agree  Can Altinbay
59 mins
agree  Charlesp
1 hr
agree  Alfa Trans (X)
1 hr
agree  Tony M: Yes, it's your second option: a chunk missing out of the mains, the opposite of a spike
1 hr
agree  Dave Calderhead
3 hrs
Login to enter a peer comment (or grade)

2 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
a very brief, steep drop in the voltage


Explanation:
The comment about notch filters is fine, but in your context, I think the author is specifying a very short, steep drop in voltage. Shown on an oscilloscope, this may look like a groove taken out of the standard sine wave, like a "one-toothed" bite from the sine wave. It may repeat or not, but I suspect it does if they are seeking to solve this as a problem.

See the link for a picture.

--------------------------------------------------
Note added at 2 hrs 6 mins (2005-12-06 16:03:30 GMT)
--------------------------------------------------

After looking at the picture, I want to raise my confidence in this to *5*


    Reference: http://www.ab.com/drives/techpapers/notch.htm
jccantrell
United States
Local time: 21:51
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 47
Grading comment
many thanks to you and Jo Macdonald, you have both been very helpful

Peer comments on this answer (and responses from the answerer)
agree  Andrey Belousov (X): The first I thought of was "a drop" - you proved it.
26 mins
agree  Nikos Mastrakoulis
4 days
Login to enter a peer comment (or grade)



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