范围Tektronix TDS 1012给出了Pyvisa的错误

Question

我正在尝试使用PYVISA将Tektronix TDS 1012B示波器连接到我的PC。 我正在使用Kubuntu 20.04，Python版本3.9.7和Pyvisa版本1.11.3。 我会执行以下操作：

>>> import pyvisa
>>> rm = pyvisa.ResourceManager()
>>> rm.list_resources()
('USB0::1689::870::C021027::0::INSTR')
>>> scope = rm.open_resource('USB0::1689::870::C021027::0::INSTR')  
>>> scope.query("*IDN?")

但是我会收到此错误消息：

Traceback (most recent call last):
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 256, in write
    return self.usb_send_ep.write(data)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/core.py", line 408, in write
    return self.device.write(self, data, timeout)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/core.py", line 989, in write
    return fn(
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 837, in bulk_write
    return self.__write(self.lib.libusb_bulk_transfer,
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 938, in __write
    _check(retval)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/usb/backend/libusb1.py", line 602, in _check
    raise USBTimeoutError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBTimeoutError: [Errno 110] Operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 638, in query
    self.write(message)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 197, in write
    count = self.write_raw(message.encode(enco))
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa/resources/messagebased.py", line 157, in write_raw
    return self.visalib.write(self.session, message)[0]
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/highlevel.py", line 543, in write
    written, status_code = self.sessions[session].write(data)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/usb.py", line 179, in write
    count = self.interface.write(data)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 436, in write
    bytes_sent += raw_write(data)
  File "/home/pierre/anaconda3/lib/python3.9/site-packages/pyvisa_py/protocols/usbtmc.py", line 258, in write
    raise ValueError(str(e))
ValueError: [Errno 110] Operation timed out

当我使用另一种类型的示波器时，此非常简单的代码正常工作。而且，当我在Windows而不是Kubuntu下使用Pyvisa时，它也有效。

有人可以帮我解决这个烦人的问题吗？

Answer 1

查看此链接到Tek tek in tek in tek in Tek的论坛中的帖子。他们建议使用pyvisa-py本机Python Visa后端。此命令指示使用pyvisa-py后端

rm = visa.ResourceManager('@py')

，而您安装了

pip install pyvisa-py

我的指尖ubuntu机器，所以我不知道是否有可以从APT安装的软件包。

Answer 2

在SUSE中连接我的TBS 1064由于写入权限而存在问题。这会导致诸如ask（）之类的请求超时。这很可能是由于UDEV/规则所致，尽管我没有弄清楚要确切地提出什么才能使其始终起作用。目前，必须对每个USB重新连接进行写入权限（admin），但随后它正在工作。
其他设备没有这个问题，这只是一个Linux问题。