关于示波器垂直位置/偏移极性的问题

我发现各种安捷伦示波器产品在垂直位置/偏移的极性读数方面存在一个有趣的差异。
在我的Agilent U1602A手持式示波器上，如果我在示波器上向上调整波形（相对于零基线的正偏移），数字显示实际上显示正偏移读数（例如偏移= +1.0 V）如果我在我的上做同样的事情
U1620A（安捷伦手持式示波器的较大版本），向上移动波形会产生负偏移读数，向下移动会产生正偏移读数。
这让我很困惑，所以我查看了另一个安捷伦示波器（4000系列），并且在向正方向移动波形时也显示负偏移数。
我之前没有注意到这一点，但通常我习惯于期望Y轴上向上移动产生正偏移，并发现这种反直觉。
有人可以解释这种行为和理由吗？
但无论理论如何，两个手持式安捷伦示波器的工作方式都不同，这使得它更加令人费解。
我想这取决于你的背景是什么是“参考”---但如果我有，例如，0-5V方波和基线（0伏）坐在屏幕的中心X轴 -
- 然后我调整波形“向上”，比如1伏（这样波形在1到6V之间，显示屏显示偏移为-1.0V。真的吗？不是偏移1V？还是在说
我需要“加”-1V来获得真正的读数？当然，这与减去1V相同 - 从向上=正偏移和向下=负偏移的角度来看，似乎更直观。我
我对其他人对其示波器的看法感兴趣，以及为什么不同型号的安捷伦示波器会不同地处理垂直偏移/位置。谢谢！



以下为原文

I am seeing an interes ting discrepancy between various Agilent scope products relating to the polarity reading of the Vertical Position/Offset.

On my Agilent U1602A handheld scope, if I adjust the waveform upwards on the scope (positive offset relative to zero baseline), indeed the numerical display shows a positive offset reading (e.g. Offset = +1.0 V)

If I do the same thing on my U1620A (a larger version of Agilent handheld scope), moving the waveform up causes a negative offset reading, and moving it down causes a positive offset reading.

This puzzles me, so I looked on another Agilent scope I have (4000 series) and it also shows a negative number for offset when moving the waveform in the positive direction.

I hadn't noticed this before, but typically I'm accustomed to expecting a positive offset resulting from a move upwards on the Y axis and find this counter-intuitive.

Can someone explain this behavior and the rationale? But whatever rationale exists, two handheld Agilent scopes work differently, which makes it even more puzzling.

I suppose it depends on your context for what is the "reference" --- but if I have, for example, a 0-5V square wave and the baseline (0 volts) is sitting on the center X-axis of the screen -- and then I adjust the waveform "upward" by, say 1 volt (such that now the waveform is between 1 and 6V, the display shows the offset as -1.0V. Really? Isn't the offset 1V? Or is it saying I need to "add" -1V to get the true reading? Of course, this is the same as subtracting 1V -- and it seems much more intuitive to think in terms of upward = positive offset, and downward = negative offset.

I'm interested in what others see on on their scopes and why different models of Agilent scopes would treat vertical offset/position differently.

Thanks!