attila
-
Posts
6,668 -
Joined
-
Last visited
Content Type
Profiles
Forums
Events
Gallery
Posts posted by attila
-
-
Hi @reddish
Regarding your question in private message, I reply here since it may be useful for other people too.
The FDwfEnumInfo info is not really needed for custom apps. It is for delay loaded "Remote Devices"... With custom apps the IP or Alias can be used for connection.
The other AMFM functions are only for the obsolete EExplorer...The enum filtering is backward compatible.
You can still use device id for filtering, like FDwfEnum(devidDiscovery2)
The filter meaning only changes when MSbit (Type) is used, like FDwfEnum(enumfilterType | enumfilterUSB)
-
In coherent mode, C2 blue, when time captures are averaged the coherence is 1 because the "fixed noise" is mostly eliminated, C1 and C2 spectrums are almost identical.
6 hours ago, attila said:The coherence in 3rd plot looks like this:
With the normal mag/phase average, the C1 captures only the W1 stimulus signal and R1(C2) = W1+W2
When the W1 and W2 are distant frequencies C1 has 1 peak and C2 has 2 peaks.
When W1 and W2 are overlapped C2 has only 1 peak attenuated or amplified depending on phase.
At close frequencies the two peaks merge or it is one wider.See at 200kHz and 290kHz with no averaging:
-
Hi @reddish
Thank you for the notification.
I didn't notice it is already released for public and also the download page is changed since I last visited it :)
-
Hi @LarsB
Please attach the project and csv if possible.
-
Hi @reddish
Adept 2.26.1 will be officially released together (or before) the wf 3.17.1
We have thought about repo but not yet committed to, it would be another thing to maintain...
-
-
Hi @spbhanus
1. The MATLAB DAQ toolbox plugin only supports Analog Discovery 1/2 and provides limited features.
However the WaveForms SDK which lets you to use all the features (including simultaneous analog/digital sampling) can also be used from MATLAB, see the following post:2. Yes. With plugin like below and with SDK FDwfAnalogInChannelRangeSet
https://www.mathworks.com/help/daq/getting-started-acquiring-data-with-digilent-analog-discovery.html3. See the specifications in the WF app Help or on the reference page
4. For such low mV signals pre-amplification would be recommended.
The ADP3450/3250 low range is 2Vpk2pk ~130uV resolution and ~30mV with 16bit sampling at 31.25MHz or lower.
The AD2 low range has about 300uV resolution. -
-
Test setup:
W1 -> 1+ and 2+ (100-400kHz 1V)
W2 -> 2- (200kHz 1V)
GND -> 1-In my previous post for the second screenshot W2 was generated with another device to be fully out of sync with the NA.
The mag/phase average (default, green): capture -> FlatTop window -> fft -> mag/phase (average) -> result
The coherent average (blue): capture -> (average) -> FlatTop window -> fft -> mag/phase -> result
With coherent average mode the scope captures are triggered by wavegen1, so each capture for averaging is perfectly in phase.The coherence in 3rd plot looks like this:
More "Min Periods" narrow the coherence peak at low frequencies:
-
The DDRam record buffering is transparent for the API, it is done internally.
The normal recording process can be used. See the SDK/ samples/ py/ AnalogIn_Record.py AnalogIn_Record_Trigger.py AnalogOutIn_PlayRecord.py ...The limits for this is are: 128MiS up to 125MHz for 1 enabled channel, 62MiS up to 62.5MHz for 2 channels, 32MiS up to 31.25MHz for 3-4 channels
I recommend using the latest version which brings fixes and improvements:
-
Hi @aryeh
You can find the new adept 2.26.1 lower in the WF beta page, at v3.16.36
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/
-
Hi @sray070
Yes.
For instance:
DD1 generates 16 signals DIO 24-39
connect DD1 DIO 39 to DD2 DIN 0 (or any other DD1 DIO to any other DD2 DIO or DIN)
DD2 Logic Analyze trigger on this input
DD2 Pattern Generator to trigger on "Logic Analyzer" Also set DD2 Run time to be less than the period and repeat Trigger to resynchronize with the DD1.
Take in consideration the ~200ns delay of DD2 signal (input, trigger, output)Here I used DD1 Logic Analyzer to monitor all the 17 signals.
-
I've implemented option for the captures to be in phase and time domain averaged, before FFT.
As you can see here with 100 average it does not help too much.
-
Hi @RobHe
In Standard boot mode it is allocated an additional recording buffer (fifo) of 128Mi (~134M) samples in DDRam.
-
I2C Spy is are added to the latest version:
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/See the example script:
For SPI see the DigitalIn_Spi_Spy.py example.
-
Hi @alexconway
The error is FT_EEPROM_WRITE_FAILED = 12
Unfortunately I don't think it worth to continue the troubleshooting, likely other ICs are damaged as well.
-
Hi @vladoya
1. Yes. Separate app needs to be opened to control each device.
Note that each device has its own oscillator so you may notice jitter/skew between devices specially at high frequency operations.2. Yes and no. The WF app Logic Analyzer supports up to 32bit samples.
3. Yes. The Pattern Generator and Logic Analyzers are independent logics in the device.
-
The FDwfDigitalI2cRead/Write perform master operations
The I2C Spy is not available form the SDK but adding it now for the next version. -
-
-
Thank you for the detailed description.
I'll try to add it to the application. -
Hi @hargan123
The following should be used:
FDwfDeviceAutoConfigureSet(hdwf, 0)
....
FDwfAnalogOut*Set ... // set parameters
FDwfAnalogOutConfigure(hdwf, channel, 1) // start
...
FDwfAnalogOut*Set ... // change parameters or set all
FDwfAnalogOutConfigure(hdwf, channel, 3) // apply
...
FDwfAnalogOutConfigure(hdwf, channel, 0) // stopFDwfDeviceAutoConfigureSet
0 - disabled: Device will be configured when calling FDwf*Configure. It is recommended for complex apps to prevent device configuration with each parameter setting.
1 - enabled (default): Any FDwf*Set will configure the device stopping the respective instrument.
3 - dynamic: Any FDwf*Set will configure the device without stopping the instrument.FDwf*Configure
0 - stop
1 - start
3 - dynamic, configure without changing the state -
Hi @LarsB
I will try to answer your questions but let me know if I miss some from your posts.
1. With DD you are using 20MHz sampling rate. If your TRIG is signal rate is higher than 10MHz or pulses shorter than 50ns
5nsit may loose some.2. Click on other row to change highlighted row or under the last row to remove highlighting.
Use the latest software to have better dark style.
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/3. Try the latest version and if you are not satisfied with the "zoom effect" please send me a workspace with data.
4. The Repeated mode is intended for oscilloscope like analysis (pulse, phase, timing...) and here the "zooming" adjusts the sample rate.
In Record mode the "zooming" does not affect the rate.5. In the WF app Welcome tab you can find the last used workspaces.
Check the "Open last workspace on start" it you want this.
-
Hi @Eugene Shin
The 10x probe advantage beside attenuation is that it reduces the (resistive and capacitive) load on the signal and it offers higher bandwidth.
Coherent averaging for network analyzer
in Test and Measurement
Posted
Hi @Robin Oswald
I'm pretty confident the implementation is good, according the theory.
This week I'm on vacation but next week I'll share beta version with these options.