On Tue, 12 Sep 2017 10:13:26 -0500,
Ken Javor <ken.ja...@emccompliance.com> wrote:
> There shouldn't be a lower impedance issue, because from 150 kHz up the LISN
> is very close to 50 ohms. And once the LISN coil impedance is well above 50
> ohms, the measured LISN impedance should be 50 ohms in parallel with the
> bleeder resistor, which is essentially 50 ohms. The only affect is if there
...
I think:
o 50 ohms / 50 uH + 5 ohms LISN has impedance spec down to 9 kHz,
and its EUT port impedance is 5 ohms + j2.8 ohms at 9 kHz.
o Automotive 5 uH LISN has impedance spec down to 150 kHz, and its
EUT port impedance is j4.7 ohms at 150 kHz.
Regards,
Tom
--
Tomonori Sato <vef00...@nifty.com>
URL: http://t-sato.in.coocan.jp
>> From: "T.Sato" <vef00...@nifty.com>
>> Reply-To: "T.Sato" <vef00...@nifty.com>
>> Date: Tue, 12 Sep 2017 21:58:54 +0900
>> To: <EMC-PSTC@LISTSERV.IEEE.ORG>
>> Subject: Re: [PSES] LISN Calibration Measurement Uncertainty
>>
>> On Mon, 11 Sep 2017 16:32:09 +0000,
>> Mac Elliott <00000a115b29e815-dmarc-requ...@ieee.org> wrote:
>>
>>> We are interested in doing some in-house LISN calibrations (impedance
>>> verification only using network analyzer) and need to develop an uncertainty
>>> budget.
>>> Does anyone happen to have a budget you could share with us? We will go
>>> through the exercise of calculating ourself but if there is one out there
>>> would appreciate it if you could share.
>>
>> I think the major contributions would be:
>>
>> o network analyzer (VNA?);
>> o calibration jig which will be required to connect coax to the LISN
>> terminals.
>>
>> Other possible contributions such as resolution and repeatability may also
>> need to be considered, even if they are relatively minor.
>>
>>
>> For lower impedance, network analyzers may have relatively large impedance
>> measurement uncertainty:
>>
>>
>> http://www.keysight.com/main/editorial.jspx?cc=ES&lc=spa&ckey=1000002148:epsg:
>> faq&nid=-11143.0.00&id=1000002148:epsg:faq
>>
>> Regards,
>> Tom
>>
>> --
>> Tomonori Sato <vef00...@nifty.com>
>> URL: http://t-sato.in.coocan.jp
>>
>> -
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