Setting power supply limit with WaveForms SDK

[rtorsvik]

Hello! I am developing a board for the AD3, and I want to utilize its positive and negative power supply to provide +5V and -5V for an op-amp. This works mostly fine, but in some cases, my board loses power, and I suspect it is due to the AD3 limiting its output. Is there some way I can adjust the power limit using the SDK, just as I can adjust the power limit with the WaveForms application?



This is how I activate the power supplies today.

def activate_supply(self, master_state=1, positive_state=1, negative_state=1, positive_voltage=5, negative_voltage=-5):
        """
            turn the power supplies on/off
            parameters: - device data
                        - master switch - True = on, False = off
                        - positive supply switch - True = on, False = off
                        - negative supply switch - True = on, False = off
                        - positive supply voltage in Volts
                        - negative supply voltage in Volts
        """
        log("Activating power supplies...", "info")

        # set positive voltage
        positive_voltage = max(0, min(5, positive_voltage))
        dwf.FDwfAnalogIOChannelNodeSet(self.device, ctypes.c_int(0), ctypes.c_int(1), ctypes.c_double(positive_voltage))
    
        # set negative voltage
        negative_voltage = max(-5, min(0, negative_voltage))
        dwf.FDwfAnalogIOChannelNodeSet(self.device, ctypes.c_int(1), ctypes.c_int(1), ctypes.c_double(negative_voltage))
    
        # enable/disable the positive supply
        dwf.FDwfAnalogIOChannelNodeSet(self.device, ctypes.c_int(0), ctypes.c_int(0), ctypes.c_int(positive_state))
    
        # enable the negative supply
        dwf.FDwfAnalogIOChannelNodeSet(self.device, ctypes.c_int(1), ctypes.c_int(0), ctypes.c_int(negative_state))
    
        # start/stop the supplies - master switch
        dwf.FDwfAnalogIOEnableSet(self.device, ctypes.c_int(master_state))

 

[attila]

Hi @rtorsvik

dwf.FDwfAnalogIOChannelNodeSet(hdwf, 3, 0, c_double(2.5)) # 2.5W