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Dynamic Signal Analysers/FFT Analyser Recommendations - Money no object

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David:
Hi all,

I am looking to purchase some new Dynamic Signal Analysers for our lab at work. We have been using HP 3562A's (and similar) for years but they are really showing their age and keeping them going is becoming harder.

HP don't have any replacement DSAs and finding new models seems to be harder than I had hoped.

Money is essntially no object.

Key requirements:
* Must be a portable self-contained unit (these are used in both development and production environments and having a PC based unit really would be a last resort)
* Must have a signal generator option to allow frequency response measurements
* Must work down as close to DC as possible (<100uHz) - upper end around 5kHz
* Noise performance must be equivalent or better than the HP 3562A

We design low noise amplifiers with ~1nV/rtHz @1Hz noise floors and very low 1/f noise. We can use an external LNA where we need to.

I have seen some ONO SOKKI FFT analysers which may do the job. The Stanford units look OK but have a very outdated interface. I'd like something without a CRT!

Cheers,

Dave

Sighound36:
Hi Dave

The most accurate SA I've used so far by a country mile is the Keysight N9042B  ultra low phase noise of -135dBc big real time bandwidths up to 4Ghz lol not used the new R&S version

https://www.keysight.com/gb/en/product/N9042B/uxa-signal-analyzer-2-hz-50-ghz.html

Although 2Hz is the bottom limit and possibly not low enough for you

A left field option is the blended multi bit ADC SA Marku pro


https://www.liquidinstruments.com/




Electrole:
Take a look at https://www.bksv.com/en/instruments/daq-data-acquisition/lan-xi-daq-system
They are well-known within sound and vibration, and some modules should go down to DC.
Perhaps a configuration would suit your requirements?
I have no affiliation with the company, BTW, but I have used their products.

hpw:

--- Quote from: David on March 12, 2023, 11:54:06 am ---Key requirements:
* Must be a portable self-contained unit (these are used in both development and production environments and having a PC based unit really would be a last resort)
* Must have a signal generator option to allow frequency response measurements
* Must work down as close to DC as possible (<100uHz) - upper end around 5kHz
* Noise performance must be equivalent or better than the HP 3562A

We design low noise amplifiers with ~1nV/rtHz @1Hz noise floors and very low 1/f noise. We can use an external LNA where we need to.

--- End quote ---

As you like to have data below 0.000xxx Hz ... as your HP3562A and others are FFT based.

This means

a) sample rate dependent
b) sample size dependent to get the required bin freq. step.
c) a good ADC with good input stage and ADC reference stage and in addition LDO power.

Just look picture below (log scaled from lowest  FFT bin) , as SR 48kHz and 32 Mio FFT points is not good enough for you requirements.

So lowering the sample rate is one option (as the ADC supports).

Also to know/understand, that the sample time will be anyway long.

my 2 cents

Hp

Someone:
R&S discontinued their analysers, the R&S UPV is probably what you were imagining.

Computer based is the way to go (since thats basically what they became) and you'd be surprised at the performance of recent scopes and signal generators, but if the signals are well constrained in amplitudes then audio interfaces are a cheaper option.

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