Products > Test Equipment
Buy a Vector Network Analyzer for low frequency
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alm:

--- Quote from: Evan.Cornell on January 19, 2023, 06:35:00 pm ---
--- Quote from: JohnPi on November 03, 2022, 04:59:10 am ---https://github.com/jp3141/Vector-Network-Analyzer might be useful

--- End quote ---

That is very interesting. Does anyone happen to know what it would take to adapt this to work with a Tektronix MDO3014, which has built-in function generator?

--- End quote ---
It would take comparing the programming manuals for the two instruments and making some minor changes to the commands that are being sent. The script is just sending raw SCPI commands (or other commands for the SDG), so you will have to change the commands to what the MDO is expecting. The scope will probably be fairly similar, but the signal generator will probably be quite different.

What I'd do is change it to use python-ivi, which allows you to more easily switch between instruments. But that would definitely be a bigger project involving changes in both this script and in python-ivi.
jasonRF:

--- Quote from: egonotto on November 01, 2022, 04:17:07 pm ---
--- Quote from: LazySpot on October 31, 2022, 10:13:57 am ---Hi

...
-measurement with a signal from about -45dBm
...

--- End quote ---

Hello,

then the AD2 is not suitable, unless you can use a attenuator and preamplifiers.

Best Regards
egonotto

--- End quote ---
The AD2 is not the only scope/generator that would have that problem.  Since the OP only needs to go to 1MHz, a relatively simple op-amp based preamp would work fine.  An example using a couple of TLE2072 is in the homemade instrument thread
https://www.eevblog.com/forum/testgear/show-the-homemade-equipment-you-are-using-now/msg4500562/#msg4500562

Signal generator attenuators would be even easier to build, I would think.  Or just use the bnc attenuators you can buy from the usual places. 

jason
2N3055:

--- Quote from: jasonRF on January 21, 2023, 03:57:24 pm ---
--- Quote from: egonotto on November 01, 2022, 04:17:07 pm ---
--- Quote from: LazySpot on October 31, 2022, 10:13:57 am ---Hi

...
-measurement with a signal from about -45dBm
...

--- End quote ---

Hello,

then the AD2 is not suitable, unless you can use a attenuator and preamplifiers.

Best Regards
egonotto

--- End quote ---
The AD2 is not the only scope/generator that would have that problem.  Since the OP only needs to go to 1MHz, a relatively simple op-amp based preamp would work fine.  An example using a couple of TLE2072 is in the homemade instrument thread
https://www.eevblog.com/forum/testgear/show-the-homemade-equipment-you-are-using-now/msg4500562/#msg4500562

Signal generator attenuators would be even easier to build, I would think.  Or just use the bnc attenuators you can buy from the usual places. 

jason

--- End quote ---

There are many scopes that have 500uV/div sensitivity up to 10V/div...
They would have no problems with 3mV P-P in Bode plot...

As opposed to AD2 having 2 ranges 0.5V/vid and 5V/div
joeqsmith:
The fact it's a VNA you require, post some details about which S parameters, power range, sweep types, features...  You mention costs but don't provide a range. 

Not much to go on.  Then again, do your homework and maybe post which ones you have looked at and where they fell short. 
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