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 Measuring impedance with General test equipment

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Dale H. Cook
Junior Member 50+ Posts
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Dale H. Cook


Join date : 2021-12-25

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeDecember 25th 2021, 1:58 pm

The three that I have used for decades (and still use) are the GR 1606-A RF Bridge, the GR 1602-AB UHF Admittance Meter, and the GR 1603-A Z-Y Bridge.

Dale H. Cook, Retired Chief Engineer, Roanoke/Lynchburg, VA

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Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
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Cliff Jones
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Cliff Jones


Join date : 2010-11-22

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeDecember 24th 2021, 1:35 pm

I don't know anything about slotted line.
But I did some browsing and here's What I found.


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and this one: 

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another with spreadsheets choices:

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pschuch
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Join date : 2020-04-16

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PostSubject: Measuring Z with a slotted line   Measuring impedance with General test equipment  I_icon_minitimeJanuary 30th 2021, 2:22 pm

DrNefario:  Send me an email at: [You must be registered and logged in to see this link.].      I can't figure out how to attach a few pages in PDF form.      I scanned in the procedure right out of the HP 415 manual and see no way to attach these simple PDF's.     (sorry I have no patience with this stuff )   Tried but get a message that the format is not supported.

It has been years since I measured Z using the slotted line but it is not difficult.     Just have to find the coordinates on the chart and do some rotation with a compass and straightedge.
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pschuch
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Join date : 2020-04-16

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PostSubject: Measuring Z with a slotted line   Measuring impedance with General test equipment  I_icon_minitimeJanuary 30th 2021, 1:59 pm

My spreadsheet doesn't cover the slotted line impedance measuring technique BUT I will post the procedure from the hp 415 manual after I scan it in.
Basically you place a short on the slotted line to determine the electrical lengths so these can be plotted on the Smith Chart.    Standby: Smile


Last edited by pschuch on January 30th 2021, 2:09 pm; edited 1 time in total (Reason for editing : Trying to add attachments)
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DrNefario
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Join date : 2021-01-30

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeJanuary 30th 2021, 7:48 am

Hello pschurch, I am interested in your spreadsheet.  I am playing with slotted line impedance measurements for kicks.  I do have an 8753C and a NanoVNA for regular use, but I want to experience the "pains" of having to make this measurement the old way. Smile  I am fine with getting the VSWR measurement and the angle for the reflection coefficient and can derive the load impedance using a Smith Chart, but I would like to implement the math in a spreadsheet.  If you already have done this I would like to calculate the complex impedance using this way.
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FrankB
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FrankB


Join date : 2010-11-22

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeApril 16th 2020, 7:39 pm

Thanks for offering the help. I am sure some members will take you up on it.
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pschuch
Beginning Member



Join date : 2020-04-16

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PostSubject: Using GR Impedance measuring equipment   Measuring impedance with General test equipment  I_icon_minitimeApril 16th 2020, 6:02 am

I have and used extensively:
GR-821-A
GR-916-AL
GR-1602-A
GR-1606-A
GR-1608-A
HP 250 RX meter
HP 415 with slotted line HP 805
BRC-160
BRC-190
If I can be of any assistance with these let me know.   For those instruments that don't give direct readings, I have simplified some of the number crunching with an Excel spreadsheet.  
Also, I worked in HP's repair and cal lab for almost 25 years and am familiar with many of the instruments available prior to the mid 90's.
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FrankB
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FrankB


Join date : 2010-11-22

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeJune 7th 2016, 3:48 pm

Got it. Thanks Cliff!!!
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Cliff Jones
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Cliff Jones


Join date : 2010-11-22

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeJune 7th 2016, 11:49 am

It works on my IPad, however I sent you an emai, with the attachment just now. Hope that works.

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FrankB
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FrankB


Join date : 2010-11-22

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PostSubject: Re: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeJune 6th 2016, 11:23 pm

Cliff,
No attachment.Sad
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Cliff Jones
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Cliff Jones


Join date : 2010-11-22

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PostSubject: Measuring impedance with General test equipment    Measuring impedance with General test equipment  I_icon_minitimeJune 6th 2016, 10:31 am

Here's a HP APPLICATION NOTE. Only using an oscillator and a VTVM.
Click here and download

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