Question

首先，感谢您停下来阅读我的文章。我正在写一个测试软件来控制下面描述的一些仪器：

信号发生器Hewlett-Packard 8648C
RF Counter Hewlett-Packard 53210A
DAQ惠普34970A

我遇到的问题是，在某些情况下，运行测试脚本时，仪器可以按预期运行，但是有些时候却不能。请在下面查看我的系统和VISA信息：

  Microsoft Windows [Version 6.1.7601]
  Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\M>python -m visa info
Machine Details:
   Platform ID:    Windows-7-6.1.7601-SP1
   Processor:      Intel64 Family 6 Model 70 Stepping 1, GenuineIntel

Python:
   Implementation: CPython
   Executable:     C:\Python27\python.exe
   Version:        2.7.15
   Compiler:       MSC v.1500 64 bit (AMD64)
   Bits:           64bit
   Build:          Apr 30 2018 16:30:26 (#v2.7.15:ca079a3ea3)
   Unicode:        UCS2

PyVISA Version: 1.9.1

Backends:
   ni:
      Version: 1.9.1 (bundled with PyVISA)
         #1: C:\Windows\System32\visa32.dll:
         found by: auto
         bitness: 64
         Vendor: Keysight Technologies
         Impl. Version: 1377151778
         Spec. Version: 5244928
  #2: C:\Windows\System32\visa64.dll:
         found by: auto
         bitness: 64
         Vendor: Keysight Technologies
         Impl. Version: 1377151778
         Spec. Version: 5244928
   py:
      Version: 0.3.1
      ASRL INSTR:
         Please install PySerial (>=3.0) to use this resource type.
         No module named serial
      TCPIP INSTR: Available
      USB RAW:
         Please install PyUSB to use this resource type.
         No module named usb
      USB INSTR:
         Please install PyUSB to use this resource type.
         No module named usb
      GPIB INSTR:
         Please install linux-gpib to use this resource type.
         No module named gpib
      TCPIP SOCKET: Available

同样，请参见下面的代码：

 import visa 
 import time
 import pyvisa

  try:
    inst_visa = ("C:\Program Files\\IVI Foundation\\VISA\\Win64\\agvisa\\agbin\\visa32.dll")
    rm = visa.ResourceManager(inst_visa)
    rm.list_resources()
    print(rm.list_resources())
    print("Requesting Instruments ID \n")

    SG8648C = rm.open_resource("GPIB0::12::INSTR")
    SG8648C.timeout =  5000
    print (SG8648C.query("*IDN?"))
    time.sleep(3)

当我使用pyVISA调试模式运行代码时，这是我得到的错误：

    2018-10-11 19:09:37,707 - pyvisa - DEBUG - viParseRsrcEx(18L, 'GPIB2::11::INSTR', 'c_ushort(1)', 'c_ushort(2)', <ctypes.c_char_Array_256 object at 0x000000000A03D8C8>, <ctypes.c_char_Array_256 object at 0x000000000A03D0C8>, <ctypes.c_char_Array_256 object at 0x000000000A03BF48>) -> 0
    2018-10-11 19:09:37,717 - pyvisa - DEBUG - GPIB2::11::INSTR - opening ...
    2018-10-11 19:09:37,737 - pyvisa - DEBUG - viOpen(18L, 'GPIB2::11::INSTR', <AccessModes.no_lock: 0>, 0, '<ViObject object at 0x000000000A03D0C8>') -> 0
    2018-10-11 19:09:37,747 - pyvisa - DEBUG - GPIB2::11::INSTR - is open with session 25
    2018-10-11 19:09:37,757 - pyvisa - DEBUG - GPIB2::11::INSTR - closing
    2018-10-11 19:09:37,767 - pyvisa - DEBUG - viDisableEvent(10L, 1073709055, 65535) -> 0
    2018-10-11 19:09:37,778 - pyvisa - DEBUG - viDiscardEvents(10L, 1073709055, 65535) -> 1073676292
    2018-10-11 19:09:37,798 - pyvisa - DEBUG - viClose(10L,) -> 0
    2018-10-11 19:09:37,808 - pyvisa - DEBUG - GPIB2::11::INSTR - is closed
    2018-10-11 19:09:37,848 - pyvisa - DEBUG - viSetAttribute(25L, 1073676314, 5000) -> 0
    2018-10-11 19:09:38,128 - pyvisa - DEBUG - viWrite(25L, '*IDN?\r\n', 7, 'c_ulong(7L)') -> 0
    2018-10-11 19:09:38,138 - pyvisa - DEBUG - GPIB2::11::INSTR - reading 20480 bytes (last status <StatusCode.success_max_count_read: 1073676294>)
    2018-10-11 19:09:45,197 - pyvisa - DEBUG - viRead(25L, <ctypes.c_char_Array_20480 object at 0x000000000A03D0C8>, 20480, 'c_ulong(0L)') -> -1073807360
    2018-10-11 19:09:45,217 - pyvisa - DEBUG - GPIB2::11::INSTR - exception while reading: VI_ERROR_SYSTEM_ERROR (-1073807360): Unknown system error (miscellaneous error).
    Buffer content: bytearray(b'')
    Unhandled exception while debugging...
    Traceback (most recent call last):
      File "\\Mac\Home\Documents\Python Scripts\Python Win Scripts\F-B\F.009.py", line 82, in <module>
        print (RF53210A.query("*IDN?"))
      File "C:\Python27\lib\site-packages\pyvisa\resources\messagebased.py", line 569, in query
        return self.read()
      File "C:\Python27\lib\site-packages\pyvisa\resources\messagebased.py", line 413, in read
        message = self._read_raw().decode(enco)
      File "C:\Python27\lib\site-packages\pyvisa\resources\messagebased.py", line 386, in _read_raw
        chunk, status = self.visalib.read(self.session, size)
      File "C:\Python27\lib\site-packages\pyvisa\ctwrapper\functions.py", line 1584, in read
        ret = library.viRead(session, buffer, count, byref(return_count))
      File "C:\Python27\lib\site-packages\pyvisa\ctwrapper\highlevel.py", line 188, in _return_handler
        raise errors.VisaIOError(ret_value)

希望任何人都可以帮助我。

预先感谢哈维尔·卡西安

安捷伦pyVISA问题VI_ERROR_SYSTEM_ERROR（-1073807360）

0 个答案: