[SI-LIST] Re: TDR equipments -- comments or reviews
- From: Ronald Miller <ron@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 09 Nov 2010 14:48:53 -0800
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Hi Dan
Both instruments perform very well and are accurate
However, I prefer the Tektronix because:
* Aside from the specifications, the TDR pulses are typically much
better than specified. They were"
specified around 30 ps at one time but typically measured around
14ps... This is nearly as good as
the 10 ps advertised by Pulse.
* The heads are much smaller and lighter so, when the umbilical
cable connects the head to the instrument the head can be more
easily to difficult to access points.
Be sure to make up adapters from the test head to the point of
contact to about 3 inches maximum length, and for differential
signals make the lengths of the two sides identical. Use
semirigid .141 OD or .093" premade coaxes and cut them in half for
the two sides of the differential line. Pasternack Enterprises is
a good cheap source.
The closer the head is to the DUT the greater the accuracy.
Short the two sides together to get an accurate calibration
of the adapter interface to your dut.
Agilent ADS is the best simulator because it takes full
advantage of all the frequency dependent parameters,
and the built-in models can be adjusted to mimic the measured
data. Software designed to convert the TDR
data into S-Parameters is not necessary in ADS because the
models are adjusted to match the time domain response
even though the simulation takes place in the frequency domain and is
converted back.
Good Hunting.
Ron
On 11/2/2010 3:15 PM, Dan wrote:
> Hi all,
> I am planning to buy TDR equipments. I have shortlisted two equipments, one
> from Agilent and anther Tektronix, along with the mainframe. Can anybody let
> me know your comments or reviews about these equipment and your advice or
> idea to buy this?
>
> I am also planning to do s-parameter extraction from the TDR measurement. So
> i need to TDT also. So i am adding a samping module.
>
> Agilent:
> mainframe: 86100C (option202 for extarcting s-parameter touchstone)
> TDR: 54754A (can anyone tell me the achievable rise time or frequency in
> this module)
> Sampling module: 86112A
>
> Tektronix:
> mainframe: DSA8200 (80SSPAR Iconnect for s-parameter extraction)
> TDR: 80E04 (can anyone tell me the achievable rise time or frequency in this
> module)
> Sampling module for TDT: 80E03
>
> Is TEK better than Agilent. Is TEK's Iconnect outperforms Agilent's option
> 202 in the mainframe to extract s-parameter touchstone?
>
> Thank You for your time.
>
> DAN
>
>
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Ronald B. Miller, Microwave/SI Engineer RAIL = NOISE + REFLECTIONS
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