attila
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Posts posted by attila
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Hi @constantina
Frequency is too high, close to resonant frequency. See at lower frequency and different reference resistor value if needed. Real circuits are not ideal.
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Hi @diligent1
You could use custom waveform, like [1,0,1,0,0,1,0,0,1,...] set the frequency to 1kHz/steps which will generate [Amplitude+Offset for 1ms, O for 2ms, A+O for 1ms, O for 3ms...]
Or if you want finer delay between pulses [1,1,0,0,0,1,1,....] freq to 2kHz/steps [A+O 1ms, O 1.5ms,...] make sure the number of steps does not exceed the AWG device buffer size, 16k with first and 32k with 3rd configuration. Use funcCustomPattern for fixed sample period, funcCustom is for more precise waveform frequency. -
Hi @diligent1
I may have overcomplicated the previous method with AM, since it can be done with a custom pattern like the picture below, but I still don't understand why it's not good for you and what exactly you need.
Please provide detailed information.
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Hi @Kageni
The AD3 ground is connected to the computer ground via the USB cable.
Be careful as shorting the power rails can damage ports or devices. -
Hi @Denspa
In AD2 hot swap controller fet+diode was used which had no backpowering. Here the USB was stopped based on AUX voltage reading.
In AD3 e-fuse with integrated fet is used which has a slight backpower before it turns off. So the decision can't rely on voltage before this ic. I'll try to reduce the current threshold to eliminate the problem you noticed. -
Hi @Denspa
I see it now. The AUX voltage and current is lower than the USB. Due to this the USB supply is not stopped.
Initially both USB and AUX are supplies are enabled. To validate the AUX supply the voltage on this needs to be between 4.5-5.5V and I also set a 154mA 'firmware' threshold to validate this supply. This, to make sure the AUX supply is really present, the voltage reading on AUX it not just a back powering. Which can only occur only if the 'USB Supply' option is set to 'Always on' and the AUX supply is removed.
In you case the AUX voltage/current is lower probably because this has higher resistance than the USB supply. If you have, you could try to use a different switching supply.
I'll try to lower this 154mA limit to see if it causes any problems. -
Hi @Denspa
Make sure the AUX power supply is in the 4.5-5.5V range and check that the USB Power setting is set to Stop with AUX.
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I couldn't try this custom software due to Java dependencies.
The dwf.framework is compatible with both amd/intel-64 and M/arm64. -
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Hi @Maxpfeiff
The WaveForms application can control two identical devices at a time or one + PS3340.
More devices can be controlled from custom app, like 1 master reference clock and trigger output, and others slaves.
See WF SDK/ sample/ py/ Device_Synchronization.py DigitalOut_Devices.py
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Hi @goedemorgen
The Impedance Analyzer with Adapter uses the V+ and DIOs to control the relays on the IA adapter board.
You can control unused DIOs from here or from Script as shown in the status bar:
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We switched to relay for better input capacitance and the cmos switch didn't like high voltages.
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The Script is intended to automate only what cannot be done manually in the application. This exposes most of the objects and methods of the app. I tried to hide the dangerous and unnecessary ones.
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or Scope.window.onActivate();
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Hi @jostikas
call: open("Scope")
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Hi @Richard H
Hopefully no AD3 repairs will be needed.
The schematic of the input stage is the following:
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Hi @Kyoko J
One application instance and a device can measure one impedance at a time.
I'm not sure I understand your question.
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HI @Behnam200
Device Descriptor Request Failed indicates a cable contact problem or controller damage.
Try another cable, port, computer. -
Hi @mjc43
Sorry... I should have read your question more carefully
1. Which WaveForms version are you using ?
It seems that you are using an old version. You can find the latest here:
https://digilent.com/reference/software/waveforms/waveforms-3/start
https://forum.digilent.com/topic/8908-waveforms-beta-download/
2. Make sure USB under Filter is checked, press Auto Refresh or Manual.
3. Make sure the driver filter is not installed, which was required for old OSX
Delete: Library/ Extensions/ DigilentFtdiDriver.kext and Reboot4. Try programming it with Vendord:Digilent
Running included scripts from the including script
in Test and Measurement
Posted
Hi @jostikas
I thought I tested it, but apparently not...
It will be fixed in the next version.