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Maxim Integrated - Integration Nation
Dennis Feucht

Z Meter on a Chip? Impedance Meter Bridge Circuits

Dennis Feucht
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TimothyD921
TimothyD921
6/8/2016 12:38:24 AM
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Newbie
Re: ESR?
Richard what does the circuit look like that you are taking measurements of?
If its an LCR circuit the ESR occurs at resonance. At resonance the two terms of reacatance cancel so all thats left is the ESR.

Timothy

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richardlim
richardlim
6/2/2016 11:34:33 PM
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Newbie
ESR?
Can someone shed some light on how you calculate ESR after taking impedance measurements?  I must be missing something because for the life of me, I have been scratching my head on how to do that for the past 4 hours!

Thanks,

Richard

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B_Albing
B_Albing
9/26/2013 2:16:21 PM
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Editor
Re: The old HP stuff
@Navelpluis - I just looked at the manual. That's a nice piece of test equipment that I would like to own. Thanks.

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Navelpluis
Navelpluis
9/26/2013 1:58:26 PM
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Artist
Re: The old HP stuff
Hi Brad,

It is on the Agilent website:

http://www.home.agilent.com/en/pd-1000003398%3Aepsg%3Apro-pn-4194A/impedance-gain-phase-analyzer?&cc=NL&lc=dut

Have fun!

Navelpluis

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B_Albing
B_Albing
9/26/2013 12:04:39 PM
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Editor
Re: The old HP stuff
@Navelpluis - Is there a site we can go to and see that documentation? Do you have your own site on which you could post the documentation? It would be nice to see the schematics.

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Navelpluis
Navelpluis
9/18/2013 7:20:19 AM
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Artist
The old HP stuff
Dennis,

In my little 'collection' of measurement equipment I have a HP4194 with a piece of servicedoc in digital form. The basic circuitry indeed is of alter importance: All performance will be depended of this. Very interesting stuff, very learning.

Everybody here with an analog background will love this piece of gear: Tonns of analog inside the HP4194 impedance analyzer. The basic principle resembles a lot of what Dennis wants to integrate in his chip, but then, approx 45x50x44cm piece of gear and it weighs a ton! ;-)

(Section 8 in the HP4194 service doc explains the principles how this beauty works)

 

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steve.taranovich
steve.taranovich
8/31/2013 9:00:18 AM
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Blogger
Re: Measurement
Samicksha---Just break down the AC impedance measurement to simple circuits--an AC voltmeter and an AC ammeter to measuer AC impedances. Design those simpler devices and you have an AC impedance meter---check out sites like Keithley Instruments for more details.

As for Z parameters--look at this link http://www.egr.unlv.edu/~eebag/Chapter19.pdf

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D Feucht
D Feucht
8/27/2013 11:48:08 PM
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Blogger
Re: Impedance meter on Chip - AD5933
The AD5933 and AD5934 are what I would consider the core of low-frequency, digitally-oriented impedance analyzers. These are more than Z meters and would be the logical extension of the Z-meter-on-a-chip idea - though ADI has gone directly to the Z analyzer instead. These ICs are a great idea, in the same direction as the Z-meter IC.

That said, I still think there is a place for the Z meter because range switching and other aspects of a full instrument could be integrated on the Z-meter IC. There is a large enough market for Z meters (apart from Z analyzers) to merit such a develop, I surmise.

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B_Albing
B_Albing
8/26/2013 10:37:16 AM
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Editor
Re: Impedance meter on Chip - AD5933
@CrunchFrog - we'll take a look at the AD part and see what it can do and how well it can do it.

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CrunchFrog
CrunchFrog
8/25/2013 9:36:59 PM
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Newbie
Impedance meter on Chip - AD5933
You might want to take a look at Analog Devices' impedance meter on a chip, AD5933. It has an on chip oscillator, DDS, ADC and does DFT on board.  Control as well as Real and imaginary value recovery is via an I2C interface. Digilent are coming out with a Pmod to plug into various Dev boards.  (I am not affiliated with AD or Digilent).

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