使用34901A模块扫描和切换电池放电测试能自动关闭电流吗？

有几种方法可以做到这一点。
每个都需要在计算机中运行的程序评估警报状态并打开通道以停止当前。
一种方法是使用单独的34903A GP继电器模块用于电流开关。
另一种方法是使用34901A第2组的通道，如果尚未使用的话。
我实际上不会使用警报，因为DMM每次都必须进行测量，只需让计算机程序扫描通道，测试值并在达到设定值（在程序中）时打开通道。



     以下为原文

  There are a couple of ways to do this.  Each requires a program running in a computer evaluating the alarm status and opening a channel to stop the current.  One way would use a separate 34903A GP relay module for the current switch.   The other would be to use a channel on bank 2 of the 34901A if it's not already being used.   I wouldn't actually use alarms for this since the DMM has to make a measurement each time anyway, just have the computer program scan the channels, test the values and open the channel when the setpoint (in the program) is reached.

但基本上，任何一种方法都需要第二个模块？
我想我真正的问题是，是否可以从单个模块中完成（因为我可以访问它）



     以下为原文

  But basically, either method would require a second module? I guess my real question is if it's possible to do it from that single module (since that's all I have access to)

很抱歉重新打开这篇旧帖但我对此回复感到担忧，也可能对其他人有所帮助。
为什么你不建议使用TTL逻辑报警来做到这一点？



     以下为原文

  Sorry for reopening this old post
But i have a concern about this reply and could be also helpful to others.
Why you not recommand to use alarms with TTL logic to do that?

也许是因为报警输出实际上无法进行所需的切换？
这些只能用于触发外部硬件，并且可能不应该用于执行连续控制功能，因为您只能在报警时确定其输出状态。
在扫描开始时清除警报。



     以下为原文

  Perhaps it was because the alarm outputs couldn't actually do the switching required? 

These can only be counted on to trigger external hardware, and probably should not be used to perform a continuous control function, as you only know their output state for sure at the time of the alarm. 

Alarms are cleared at the start of a scan.

34901A有两个10通道组，可以相互独立操作。
对于插槽1中的34901A，存储体2通过中继通道s99（199）与存储体1隔离。如果使用打开和关闭命令关闭各​​个继电器和没有通道编号的MEAS命令，则可以完全控制并保留存储体
继电器199打开。
然后，您可以关闭第二个银行的任何渠道，将其连接到银行2公共。
我将仔细检查以查看通道199是否保持打开，直到您为正常测量命令序列寻址第2行的通道。
如果是这样，您将不必更改任何测量命令。
您可以通过尝试使用ROUT：CLOS查询通道199的状态来自己完成此操作吗？
（@ 199）查询。



     以下为原文

  The 34901A has two 10 channel banks that can be operated independently of one another.   Bank 2 is isolated from bank 1 by relay channel s99 (199) for the 34901A in slot 1.   If you use open and close commands to close the individual relays and the MEAS command without a channel number, you have full control and can keep bank relay 199 open.   Then you can close any channel on bank two to connect it to the bank 2 common.   I will double check to see if channel 199 stays open until you address a channel on bank 2 for a normal measurement command sequence.  If so, you won't have to change any of your measurement commands.  You can do this yourself by trying it an querying the state of channel 199 with the ROUT:CLOS? (@199) query.

我把它收回。
我对34980A的工作方式感到困惑。
无论何时在任何通道上进行测量，34970A都会关闭存储体继电器并打开两个存储体上的所有通道继电器。
因此，只有一个34901A无法做到这一点。



     以下为原文

  I take it back.  I was confused by the way the 34980A works.  The 34970A closes the bank relay and opens all channel relays on both banks whenever you do a measurement on any channel.  So there is no way to do this with only one 34901A.