U1272A平滑模式不稳定是怎么回事？

与支持人员讨论此产品，基本上他们要求更多信息。
请参阅下文：根据现有的使用AC / DC放大器钳位和示波器连接的应用，您能否详细说明0.3mV读数。
是否总是出现0.3mV不稳定的情况？
在处理上述应用程序时，0.3mV是否为恒定读数？您能否进一步解释您是否因应用程序而获得了不稳定性？
是否存在大量噪音？U1272A当应用中存在干扰读数的噪音时使用平滑模式，尤其是当您看不到稳定的读数时。
通过启用平滑模式，刷新率将稳定读数。



     以下为原文

  Spoke with the support guys for this product, basically they are requesting more information.  See below:

Can you elaborate on the 0.3mV reading based on the existing application of using AC/DC amp clamp and the oscilloscopes connection. Is this always the case having 0.3mV instability? Is 0.3mV a constant reading while working on the said application?
Could you further explain you acquired the instability based on your application? Is there a lot of noise?
U1272A Smooth mode is used when there is noise in the application that interferes with the reading especially when you do not see a stable reading. By enabling Smooth Mode, the refresh rates will stabilize the readings.

我将提供一些更好理解的例子。
a）我在万用表上连接夹具，我在夹具上使用自动归零功能。然后我在万用表上激活Min Max AVG。
我得到了这个读数.Max = + 0.451Min = - 0.331AVG = + 0.05030mV范围manual.b）我用作负载一盏12V灯需要大约2A。
我正在使用我的专业建伍0-35V 10A PSU给灯充电，我正在测量电流。我得到最大最大值。
最大= 19.984 mVMin = 19.140AVG = 19.58830mV范围手动。我这次用灯和一个12V电池进行相同的测试。我得到最大最大值。
最大值= 18.197 mVMin = 17.267AVG = 17.75030mV范围手册。
在所有这些测量中，重要的部分是为什么最小最大值之间存在这种差异的问题？
Min max差异我将其描述为Play up。
由于它是不变的。
我做了三分之一测试。
这次只需300mV范围内的万用表钳位。
像往常一样设置零，然后我激活Min Max.Max = +0.24 mVMin = - 0.47AVG = -0.11然后我激活峰值，看看会发生什么，我得到：峰值最大值+ 1.41mvPeak min -1.49mv它可能
夹具不能带来最好的自动归零并且关闭它的校准。但关键是这个起来有点烦人，我试图用平滑的功能来平滑它。
问题：1）你认为这种钳子的行为是正常的吗？2）你有什么建议更好的方法，以获得最稳定的读数？
3）如果我必须使用平滑模式，是否有关于我必须在平滑模式下设置多少样本的重击规则。没有必要说U1272A的用户指南中的平滑功能是
记录很差。谢谢。



     以下为原文

  I will offer some examples for better understanding.

a) I am connecting my clamp on the multimeter, I use the Auto Zero function on my clamp.
And then I am activating the Min Max AVG on the multimeter.
And I get this readings.
Max = + 0.451
Min = - 0.331
AVG = +0.050
30mV Range manual.

b) I am using as load one lamp 12V it needs about 2A .
I am powering up the lamp with my professional Kenwood 0-35V 10A PSU, and I am measuring the current.
And I get with min max.
Max =  19.984 mV
Min =  19.140
AVG = 19.588
30mV Range manual.

I do the same test with the lamp and one 12V battery this time.
And I get with min max.
Max =  18.197 mV
Min =   17.267
AVG =  17.750
30mV Range manual.

In all those measurements the important part is the question of why to be such difference between the Min Max values ?
The Min max difference I am describing it as Play up.
Due the fact that it is constant.  

I did and one third test.
Just the clamp on the multimeter at the 300mV range this time.
Zero set as usual, and then I activated Min Max.

Max =  +0.24  mV
Min =  - 0.47
AVG =  -0.11

And then I activated Peak so to see what happens, and I got:
Peak max  +1.41mv
Peak min   -1.49mv

Its possible the clamp to not be able to bring the best auto zero and be off calibration about that.
But the point is that this play up it is a bit annoying, and I am trying to smooth it with the smooth function.

Questions :
1) Do you thing that the behavior of this clamp is normal ?
2) What do you suggest as better method so to get the most stable readings ?
3) If I have to use the smooth mode, is there any rule of the thump about how many samples I had to set in the smooth mode.
There is no need to say that the smooth function in the users guide of the U1272A it is very poorly documented.

Thank you.

对于（a）部分，已知普通钳形表具有HALL效应。
毫无疑问，没有任何测量，即使设置为零，它也会显示一些当前读数。
我对问题1的回答：钳位行为是正常的，这称为HALL EFFECT.Question 2：当使用SMOOTH MODE时，U1272A的固件会自动提取读数并执行平均。
请设置为SLOW for SMOOTH MODE，其中平均值以每秒15个平均值的速率进行。
通过这样做，读数可以更稳定。问题3：基本上，当SMOOTH MODE被使用时，有三个采样率。
即：SLOW = 15平均值/秒; NORMAL = 10平均值/秒FAST = 5平均值/秒。对于部分（b），最小和最大功能，解释了在测量的情况下，只要读取最低读数
，读数将标记为分钟。
对Max来说反之亦然，只要读取最大读数，读数就会被标记为最大值。我希望上面有助于理解如何使用平滑模式以及最小值，最大值。请告诉我是否
你需要更多的信息。



     以下为原文

  For part (a), common clamp meters are known to have HALL effect. No doubt without any measurement, it will display some current reading even after you set to zero. My answer to Question 1:  The clamp behavior is normal, this is called the HALL EFFECT.
Question 2:  U1272A’s firmware will automatically pull the readings and perform averaging when SMOOTH MODE is used. Please set to SLOW for SMOOTH MODE where averaging is done at a rate of 15 averages per second. By doing so, the reading can be more stable.
Question3:  Basically, there are three samples rate when SMOOTH MODE is engaged. Namely: SLOW = 15 averaging/sec ;NORMAL = 10 averaging/sec FAST = 5 averaging/sec.

For part (b), min and max function, explained that in the event of measurement, as long as the lowest reading is picked up, the reading will be marked as min. Vice versa for Max, as long as the biggest reading is picked up, the reading will be marked as max.

I hope the above helps to understand how Smooth mode can be engaged as well as min, max are engaged.

Please let me know if you need more information.

谢谢你的回答。
我确实发现它们在某一点上很有用。
所以，我需要问几个问题。我们推测我们有一个当前的校准器设备，我们将输出设置为2.00 A DC。我们使用一根电缆和香蕉作为桥接器。然后我们使用一个安捷伦钳形表来实现
测量它。
测量结果如何在屏幕上显示：a）一个恒定读数2.000 A（4.000计数）b）最后一位数字的波动读数。如果读数有波动，则称为正常的任何标称值。
U1210系列测量AC或DC安培时的读数/ S是多少？每秒七个读数仅用于电压测量？
关于U1272A，在函数（Max Min）中平均读数每秒使用多少样本？
它是否与Smoothing模式下的Slow设置相当？谢谢。



     以下为原文

  Thank you for the answers.
I did found them useful up to a point.

And so, I need to ask few more questions.

Let’s speculate that we have one current calibrator device, and we set the output at 2.00 A DC.
We use one cable with bananas as bridge.
And then we use one Agilent clamp meter so to measure it.
How the measurement will look like in the screen:

a)  One constant reading of 2.000 A   (4.000 counts) 
b)  Fluctuating readings in the last digits.
If there is fluctuating readings, is any nominal value that it is called as normal.

In the U1210 Series what are the readings/S when they measure AC or DC Amperes?
The seven readings per second are just for voltage measurements? 

About the U1272A, at the function ( Max Min ) the average reading how many samples  per second it uses ?  Is it comparable with the Slow setting at the Smoothing mode ?

Thank you.

关于U12XX Clamp流量计的第一部分，请参考agilent.com获取U12XX数据表的副本。
在其中，您将找到特别是AC规格的答案.U1272A的显示速率：Max和Min基于每秒7个读数的显示速率。
与平滑模式慢速率相比，这没什么。



     以下为原文

  For the first part, about the U12XX Clamp meter, please refer to agilent.com for the copy of U12XX datasheet. In it you will find answers especially on AC specification.

The display rate of U1272A:  Max and Min are based on a display rate of 7 readings per second.  This is nothing compared to the smooth mode slow rate.