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Oscilloscope for low frequency measurements 1 mHz - 20 MHz
Sphyrna:
Hello,
I am searching for a scope which is capable to measure in the low frequency range and is able to directly represent the measurement data in the FFT in V/sqrt(Hz). The benefit would be that I could compare the data directly with the specs given in some data sheets. I tested a LeCroy HDO6000 and a R+S RTO64 but the lowest start frequency in the FFT that can be set is 1 Hz. These low frequency measurements I am doing are actually done with a LeCroy 64MXs-B and a post data processing. Inside the FFT this device can't do a logarithmic scale and frequency's below 1 Hz. But you can extract that from the FFT data. I know there is a SRS SR780 and a HP35670A for these kind of measurements like in: https://www.renesas.com/us/en/document/apn/an1560-making-accurate-voltage-noise-and-current-noise-measurements-operational-amplifiers-down-01hz. But isn't there a new scope which is able to measure in the low and in the higher frequency range for measurements from 1 mHz until 20 MHz or something like that? The measurements could be done in different settings (memory limitations in combination with the sampling rate). First, the range from 1 mHz to 4 kHz would be interesting for me. Any hints?
Kind regards,
S.
2N3055:
--- Quote from: Sphyrna on October 26, 2023, 07:44:02 am ---Hello,
I am searching for a scope which is capable to measure in the low frequency range and is able to directly represent the measurement data in the FFT in V/sqrt(Hz). The benefit would be that I could compare the data directly with the specs given in some data sheets. I tested a LeCroy HDO6000 and a R+S RTO64 but the lowest start frequency in the FFT that can be set is 1 Hz. These low frequency measurements I am doing are actually done with a LeCroy 64MXs-B and a post data processing. Inside the FFT this device can't do a logarithmic scale and frequency's below 1 Hz. But you can extract that from the FFT data. I know there is a SRS SR780 and a HP35670A for these kind of measurements like in: https://www.renesas.com/us/en/document/apn/an1560-making-accurate-voltage-noise-and-current-noise-measurements-operational-amplifiers-down-01hz. But isn't there a new scope which is able to measure in the low and in the higher frequency range for measurements from 1 mHz until 20 MHz or something like that? The measurements could be done in different settings (memory limitations in combination with the sampling rate). First, the range from 1 mHz to 4 kHz would be interesting for me. Any hints?
Kind regards,
S.
--- End quote ---
If up to 5MHz BW is OK, I would contact Picotech pre sales support and ask them about model 4262 and present you problem.
You cannot do what you need directly in software, but they have great API and you can pull data into Matlab directly and do whatever you want there.
Best,
Sphyrna:
We have some picotech scopes here. But my wish would be that there is a way without post processing. Of course if it's always the same measurement I could write a script. But it would be very convenient to have a out of the box solution. For me it is not 100% clear why the modern scopes can't measure till 1 mHz. Is it because of the DC stability? Is the 1/f noise is too high?
coromonadalix:
with the pico
you have to slow down the acquisition speed / timebase and take looooooong measurements in the 1-5 hz range ?? below 1 hz never tried, will do when i can
i have a 3406D
maxwell3e10:
HP89410A is one spectrum analyzer I know that spans the range from 1 mHz to 10 MHz. Scopes usually have significant 1/f noise. But for very low frequency measurements, it is often beneficial to save the data in the time domain and do off-line analysis because one see glitches and drifts more clearly.
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