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Found 5 results

  1. Francoisb24

    Pmod ISNS20

    Hi everybody, I recently bought a pmod isns20 and I have problems with reading values on AC current (230V 50Hz). It returns random values. But in DC current it returns good values. I recover the values through spi with an arduino micro. I tried all the combinations of the jumps to change filtering or sampling frequency but nothing good ... Could you help me ? Is there someting special to for for measuring AC currents ? Thanks in advance ! Best regards
  2. Hi, How did you measure the typical current ranges listed in Table 1.1 in the Pynq reference manual? https://reference.digilentinc.com/reference/programmable-logic/pynq-z1/reference-manual I have purchased a Pynq board and would like to measure actual power consumed by different board components using an external measurement device. I was wondering whether there are shunt resistors on the Pynq (similar to the ARTY) that enable measurements listed in Table 1.1. Best regards, Ananya
  3. Would it make the Analog Discovery 2 more powerful device if it is added the feature to measure current too? Furthermore it can still draw the IV-Characteristic curve using XY draw function in Oscilloscope for which we use some low value resistor etc. But will it be not more easy to use and be precise if it has built-in current measurement capability and can draw the IV-Characteristics directly for device under test?
  4. I've measured the Analog Discovery 2 drawing a current of 510 mA over USB. The USB 2.0 specification [1] dictates that devices shall not draw an absolute maximum current greater than 100 mA before configuration and shall not draw an absolute maximum current greater than 500 mA once configured. It appears to me that the AD2 is not compliant with the USB 2.0 specification. This could explain the Waveforms 2015 errors messages that I reported in another thread on this forum [2]. Measurements were taken on a "warm" AD2 that had already been operating; I anticipate peak current on an AD2 that has been disconnected for some period will be higher (capacitances discharged). Measurements were performed with the AD2 running solely from USB power. Measurements were taken while connecting the AD2 to a PC on which the Waveforms 2015 software was already running. Measurements were not taking during AD2 acquisition or waveform generation operations. Didn't get a photo of the 510.1 mA measurement, but a photo of a 507.7 mA measurement is attached. The measurements were made with a Fluke 87V in mA DC mode with the range manually fixed to "600". The large currents were detected using peak-min-max mode (250 microsecond response time). The large currents were not detected using regular min-max mode (100 millisecond response time). The USB 2.0 spec makes the peripheral responsible for limiting its in-rush current and implementing soft-start as needed. -- Chris [1] http://www.usb.org/developers/docs/usb20_docs/usb_20_120516.zip --> usb_20.pdf, sections 7.2.1 and 7.2.4.1 [2] https://forum.digilentinc.com/topic/3226-waveforms-2015-jtscinitscanchain-failed-error-dptiio-failed-error-ubuntu-16041-x86-64-analog-discovery-2-analog-discovery-2/#comment-11671
  5. I used an analog discovery a lot for a class last year, but just pulled it out for the first time in a while. I used the +5VDC supply to power a MCU project but kept getting current overdraw warnings after a few minutes. With all instruments closed and the analog discovery's pin header completely disconnected, the device is still drawing ~425 mA, which seems a bit high. Is it normal for the AD to have only ~75 mA of headroom for the voltage supply tool? I remember it being able to handle much more in the past.