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Getting some errors when get data of power supply through device NI 9233 and Python3

First of all, sorry if i'm posting on the wrong topic

I'm using nidaqmx module and python3 to get some data from a power supply through NI 9233 device.

However, I'm getting some errors:

DaqError                                  Traceback (most recent call last)
<ipython-input-2-7344b4d10409> in <module>()
      1 with nidaqmx.Task() as task:
      2     task.ai_channels.add_ai_voltage_chan("Dev1/ai0")
----> 3

c:\users\júnior\appdata\local\programs\python\python36\lib\site-packages\nidaqmx\ in read(self, number_of_samples_per_channel, timeout)
    603             <type 'float'>
    604         """
--> 605         channels_to_read = self.in_stream.channels_to_read
    606         number_of_channels = len(channels_to_read.channel_names)
    607         read_chan_type = channels_to_read.chan_type

c:\users\júnior\appdata\local\programs\python\python36\lib\site-packages\nidaqmx\_task_modules\ in channels_to_read(self)
    221                 break
--> 223         check_for_error(size_or_code)
    225         return Channel._factory(self._handle, val.value.decode('ascii'))

c:\users\júnior\appdata\local\programs\python\python36\lib\site-packages\nidaqmx\ in check_for_error(error_code)
    125         cfunc(error_buffer, 2048)
--> 127         raise DaqError(error_buffer.value.decode("utf-8"), error_code)
    129     elif error_code > 0:

DaqError: Task contains physical channels on one or more devices that require you to specify the Sample Clock rate. Use the Sample Clock Timing function/VI to specify a Sample Clock rate.

You cannot specify a Sample Clock rate if Mode is set to On Demand.
Task Name: _unnamedTask<0>

Status Code: -201087

I was following the nidaqmx tutorial from its website (

with nidaqmx.Task() as task:


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This discussion continues at Leitura de dados de uma fonte através do dispositivo NI 9233 e Python3

Lígia T. Ferreira
Technical Support Engineer
National Instruments Brazil

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