IEC 60601-1-8 ed2.1 Consol. with am1 (2012)

N

nbarabino

#1
Hi

I've just seen there's a new amendment to IEC 60601-1-8, anyone knows what has changed?

From the preview it doesn't seem to be anything big.

Regards
 
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N

NickM

#3
If Ed 2 applies to your equipment, Ed 2.1 will as well and you will want to get the updated version. The nice thing about the new consolidated editions from IEC is that they show all the changes in red text. From quick glance, there are a fair number of changes. I am not an expert in this standard and don't have the time to do a detailed comparison but I can at least list out the clauses that have changed: 1.3.1, 2, 3, 3.1, 3.37 (new), 6.1.2 (complete rewrite), 6.3.2.2, 6.3.3.1, 6.3.3.2, 6.6.2.1, 6.8.1, 6.8.3, 6.8.4, 6.8.5, 6.10, 6.11.2.2, 6.12, A.2, A3.34, A3.37 (new), A5.2.1, A6.1.2, A6.2, A6.3.2.2, A.6.3.3.1, A6.3.3.3, A6.4.2, A6.8.1, A6.9, A6.11.2.2, A6.12, B.1, B.2, B.3, Table C.1, D.1. Hope this helps!
 
L

light229

#5
It's not easy to do the testing for
Table 4 ? Characteristics of the PULSE of auditory ALARM SIGNALS,
is there any equipment which can get the Number of harmonic components in the range 300 Hz to 4 000 Hz? I don't think every engineer can understand and get the Number of harmonic components, thanks
 
N

nbarabino

#6
Hi

I have no experience with audio alarms, but I came across with this that may give you an idea of the testing:

Sorry I can?t put the link, search the web for this document: Using Audible Alarms in Medical Equipment (IEC 60601-1-8)

Regards
Nicol
 
L

light229

#7
Hi, nbarabino
Thanks for your information, I read the document you recommended, but can not find how to test and verify the Table 4 ? Characteristics of the PULSE of auditory ALARM SIGNALS and Number of harmonic components.
I am sorry that I am a test engineer not a designer,
 
N

nbarabino

#8
To test the harmonics requirement of Table 4 you should look at the signal spectrum (as shown in the article's figure 1) and verify that 4 harmonics are present within 300-4000 Hz and that their amplitude is within +-15dB of the fundamental frequency.
 

Peter Selvey

Staff member
Super Moderator
#9
As a starting point, you can connect a modern oscilloscope to the drive signal to the speaker. Most newer oscilloscopes have a fft mode which allows you to view the frequency spectrum. It takes a bit of playing with. Adjust the sampling rate until you see clear peaks e.g. 400Hz, 800Hz 1200Hz etc for a waveform with a 400Hz fundamental.

If the frequencies are well within the speaker's pass band, then this result should be similar to the true sound.

For a true test you need a sound level meter with an "ac" output. This output allows you to view the raw sound signal on an oscilloscope, from which a frequency spectrum can be viewed (as above).

Place the sound level meter as close to the speaker as possible. Do not test at 1m, because at this distance reflections will influence the test result (even in an ISO 3744 chamber, there are reflections from the floor).
 
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