怎么使用Agilent 34405A进行USB通信

你好，我知道这篇文章已经很老了，但是我遇到它并且它仍然没有帮助，所以我想我会为下一个有这个问题的人或者加入它。
确实，这是固件问题。
但是，如果您无法与仪器通信，则无法更新固件。
我发现这与我正在使用的Dell OptiPlex 9010上的USB端口存在通信问题。
我能够使用较旧的Dell OptiPlex 760.奇怪的是，Dell OptiPlex 9010具有USB-2.0端口，就像戴尔OptiPlex 760一样。但是，仪器不会在OPT9010上与OPT760通信的端口进行通信。
我假设戴尔驱动程序更新或某些可能导致我的问题。
将仪器连接到OPT760后，我可以更新固件，使其与Dell OPT9010的USB端口兼容。
Windows操作系统和连接专家现在可以正确地与34405A-DMM通信。
尝试使用旧型号的计算机进行固件更新。



     以下为原文

  Hello, I know this post is very old but I came across it and it was still no help so I thought I would add to it for the next guy or gal that has this issue.

It is true that this is a firmware issue. However, if you cannot communicate with the instrument then you cannot update the firmware.
I found this to be a communication issue with the USB ports on the Dell OptiPlex 9010 I was using. I was able to use an older Dell OptiPlex 760.
The oddity is that the Dell OptiPlex 9010 has USB-2.0 ports just as the Dell OptiPlex 760. However, the instrument will NOT communicate on the OPT9010 ports where it will communicate on the OPT760.
I'm assuming a Dell driver update or something might have caused this issue for me.

Attaching the instrument to an OPT760 allowed me to update the firmware, making it compatible with the USB ports of the Dell OPT9010. The Windows OS and Connection Expert will now properly communicate with the 34405A-DMM.

Try using an older model computer to do you firmware update.

谢谢 - 刚刚遇到两个老式的34405A这个问题。
尝试连接两台不同的Windows 7 64位PC（一台非品牌I5四核台式机，一台Dell E6520 I5笔记本电脑），在设备管理器中收到感叹号图标和“驱动程序无法启动”消息。
在旧的Dell D830笔记本电脑（双核，Win7 32位）上安装了Keysight IO Libraries 16.3，两个DMM都可以连接，而设备管理器中没有显示任何问题。
熟悉固件升级程序，从1.39升级，从1.40升级到1.50 - 现在两个DMM都连接到之前显示问题的两台PC。



     以下为原文

  Thank you - just had exactly this problem with two oldish 34405As.  Trying to connect to two different Windows 7 64-bit PCs (one unbranded I5 quad-core desktop, one Dell E6520 I5 laptop), got the exclamation-mark icon and "Driver could not be started" message in Device Manager.  
Installed Keysight IO Libraries 16.3 on an old Dell D830 laptop (dual-core, Win7 32-bit), both DMMs were able to connect with no problems shown in Device Manager.  Ran the Firmware Upgrade program, upgraded one from 1.39, other from 1.40, both to 1.50 - now both DMMs connect to both of the two PCs previously showing the problem.