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Buy a Vector Network Analyzer for low frequency
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LazySpot:
Hi

I want buy a Vector Network Analyzer, but for lower frequcy
-measurement bandwidth from several dozen kHz, up to a single MHz is enough
-measurement with a signal from about -45dBm
-shifted measuring range - the phenomena have - in relation to the background - dynamics of the order of a few to a dozen dB
-high measurement resolution of 100, 30, preferably even 10Hz
-external measurement control, (step selection of frequency subbands), preferably from PC tables
-preferably with an included external measuring bridge

VNA with this parameters are expensive because have a high frequency bandwidth, but I don't need it.
precaud:
Low-frequency VNA's often go by the name FRA, or Frequency Response Analyser.
nctnico:
The Anritsu MS4630B comes to mind. This has been discontinued so you have to buy it used. You'll need to use an external bridge but then again, at low frequencies you are likely better off using different measurement methods.

I don't know of any more modern pieces of test equipment that offer similar features (no, oscilloscope FRA is not a substitute for a proper network analyser). Maybe the Analog Discovery 2 could come close to a real VNA but I have not hands on experience with that.
Kean:
Omicron Lab Bode100 - but you might not want to look at the price...
https://www.omicron-lab.com/products/vector-network-analysis/bode-100/

There is more discussion elsewhere here about alternatives, such as
https://www.eevblog.com/forum/metrology/please-suggest-alternative-for-bode100/
egonotto:

--- 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
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