如何在34901A上建立连接来测量电压和电流？

你好。
用户指南的34970A快速入门部分详细介绍了这一点。
通道21和22是当前的测量通道。
通道1到20可用于测量电压和其他测量功能。
这会回答你的问题吗？
如果没有，请告诉我您的需求。



     以下为原文

  Hello.   This is pretty well covered in the 34970A Quick Start secion of the User's Guide.  Channels 21 and 22 are the current measurement channels.   Channel 1 through 20 can be used to measure voltage and the other measurement functions.   Does that answer your questions?  If not, let me know what you need.

是的，我已阅读手册中的说明。
它声明范围是10mA，100mA和1A。
我需要记录当前的抽取超出这些限制。
有办法吗？



     以下为原文

  Yes, I've read the descriptions in the manual.  It states that the ranges are 10mA, 100mA, and 1A.  I need to log current draws well beyond those limits.  Is there a way to do it?

对不起，我错过了。
对于高电流，您将需要34330A电流分流器或等效的低电阻，高电流分流器。
这是一个精密的1毫欧电阻器。
您测量电压并使用1 mV / A转换来获得电流。
你需要一个非常低的电阻，所以你不要通过在分流器上引入太多的电压来扰乱电路。
我会得到一个双香蕉插头端接电缆，你可以从任何电子商店获得连接到34901A电压通道。
从一端切断双bana插头连接器，将两根导线连接到Hi和Lo通道端子，注意获得正确的极性，以获得正读数而不是负读数。
请注意，由于在30A（30 mV * 30A）下的0.9瓦热耗，您应该只在该电流下工作最多15分钟。
这不是太大的功率，但它会加热电阻足以改变电阻并给你错误的读数。
如果你不能这样做，你将需要找到一个精密的1 mOhm电阻器，带有散热器和可能的风扇，以保持电阻器冷却。
我不知道你在哪里可以找到它。
实际上，这取决于您需要的准确性。
您可以购买经过校准的电流测量变压器，或像34134A那样的钳位，它可以提供1V / A输出，不需要切入电流导体，但精度只有+/- 2％。



     以下为原文

  Sorry I missed that.  For high currents, you will need the 34330A current shunt or the equivalent low resistance, high current shunt.  This is a precision 1 milli-ohm resistor.  You measure the voltage and use the 1 mV/A conversion to get the current.  You want a very low resistance like this so you don't disturb the circuit by introducing too much voltage drop across the shunt.  I would get a dual banana plug terminated cable that you can get from any electronics shop to make the connection to the 34901A voltage channel.   Cut off the dual bana plug connector from one end and connect the two wires to the Hi and Lo channel terminals, taking care to get the correct polarity so you get a positive reading instead of a negative reading.  Note that because of the 0.9 Watt heat dissapation at 30A (30 mV * 30A), you should only operate at that current for a maximum of 15 minutes.  That isn't much power, but it will heat up the resistor enough to change the resistance and give you the wrong reading.  If you can't do that, you will need to find a precision 1 mOhm resistor with a heat sink and possibly a fan to keep the resistor cool.  I don't know where you could find that.

Actually, it depends on the accuracy you need.  You could buy a calibrated current measurement transformer, or clamp like the 34134A which gives you a 1V/A output and doesn't require cutting into the current conductor, but that only has +/- 2% accuracy.

谢谢您的帮助。
看起来你提到的分流器在我需要它的时间段内不能处理电流。
我认为更好的方法是使用具有正常电压或电流输出的电流测量设备到数据记录器。
你怎么看待这个想法？
实际上我有更多的测量点，而不是我的频道，所以这将允许我以同样的方式做所有事情。



     以下为原文

  Thanks for the help.  It looks like the shunt you mention won't handle the current over the time period I need it to.  I'm thinking that a better way would be to use a current measuring device with a normal voltage or current output to the datalogger.  What do you think of that idea?  I actually have more measurement points than I do channels anyway, so this would allow me to do everything the same way.

那是我之前留言中的B计划。
34134A是一款电流测量设备，每安培输出1伏特。
输出可以连接到34901A并使用34970A / 72A进行测量。



     以下为原文

  That was my plan B from my previous message.   The 34134A is a current measurement device that outputs 1 volt per amp.  The output can be connected to the 34901A and measured with the 34970A/72A.