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我想生成相对于DC偏移具有小幅度的波形,例如,
方波在1.0和1.01V之间。 常规DC偏移场限制为波形幅度的两倍。 但真正的问题是33120按照任意波形数据的峰峰值范围缩放输出的方式。 输出似乎是:伏特=幅度* DN /(MaxDN - MinDN)+偏移对于我的例子1.0到1.01V,我能做的最好是幅度= 0.01偏移= 0.02 MaxDN = 2047 MinDN = 2026然后实际输出是 0.985到0.995 V. :(我知道增加一个外部直流电源来抵消输出,但有没有办法绕过峰峰值范围缩放?在上面的例子中,如果我创建一个从0.0到1.01的波形 V,使用幅度= 1.01偏移= 0.505 MaxDN = 2047(输出为1.01V)MinDN = -2047(输出为0V),DN = 2006输出= 1.00V有足够的分辨率 - 但在-2047加点将导致 输出中出现故障。感谢任何想法。 以上来自于谷歌翻译 以下为原文 I want to generate waveforms with small amplitude relative to the DC offset, e.g. a square wave going between 1.0 and 1.01V. The regular DC offset field is limited to twice the waveform amplitude. But the real problem is the way the 33120 scales output by the peak-to-peak range of the arbitrary waveform data. The output appears to be: volts = amplitude * DN / (MaxDN - MinDN) + offset For my example 1.0 to 1.01V, the best I can do is amplitude = 0.01 offset = 0.02 MaxDN = 2047 MinDN = 2026 Then the actual output is 0.985 to 0.995 V. :( I know about adding an external DC supply to offset the output, but is there some way to bypass the peak-to-peak range scaling? In the above example, if I create a waveform from 0.0 to 1.01V, using amplitude = 1.01 offset = 0.505 MaxDN = 2047 (output is 1.01V) MinDN = -2047 (output is 0V) and DN = 2006 for output = 1.00V There's plenty of resolution - but adding the point at -2047 will cause a glitch in the output. Thanks for any ideas. |
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2个回答
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实际上,使用外部DC偏移仍然无法解决问题 - 因为如果幅度低于100mV,我会从设备得到错误。
我无法想象为什么这个东西必须通过MaxDN扩展 - MinDN(而不是总是缩放4094),它肯定会导致问题。 BTW:通过“DN”我指的是“DAC”值。 以上来自于谷歌翻译 以下为原文 Actually, using an external DC offset still doesn't solve the problem - because I get an error from the unit if the amplitude is below 100mV. I can't imagine why the thing has to scale by MaxDN - MinDN (instead of always scaling by 4094), it sure causes problems. BTW: by "DN" I'm referring the the "DAC" values. |
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也许我只是在这里给自己打字,但如果有人有兴趣,我找到了我需要的技巧。
当定义波形时,不会执行任意波形中DAC值(最大 - 最小)范围的幅度缩放,但仅在设置幅度时(通过APPLy或VOLTage命令)。 例如: - 设置波形范围-2047至+2047,设置幅度1.0 - >输出为-0.5V至+ 0.5V(输出= DN / 4094) - 将波形更改为范围1000至2000 - >输出为0.244V至 0.488V(静态输出= DN / 4094) - 将幅度设置为1.0 - >输出为1.0V至2.0V(输出= DN / 1000)因此,当缩放/幅度/偏移限制进入时,获得所需的偏移或电平 方式,设置具有合适DN范围的虚拟波形,设置所需幅度,然后设置实际波形值。 以上来自于谷歌翻译 以下为原文 Maybe I'm just typing to myself here, but in case anyone is interested, I found the trick I needed. The scaling of amplitude by the range of DAC values (max - min) in an arbitrary waveform is not performed when the waveform is defined, but only when the amplitude is set (by APPLy or VOLTage commands). For example: - set waveform in range -2047 to +2047, set amplitude 1.0 -> output is -0.5V to +0.5V (output = DN/4094) - change waveform to range 1000 to 2000 -> output is 0.244V to 0.488V (still output = DN/4094) - set amplitude to 1.0 -> output is 1.0V to 2.0V (output = DN/1000) So to get a desired offset or level when the scaling/amplitude/offset limits get in the way, setup a dummy waveform with suitable DN range, set the desired amplitude, THEN set the real waveform values. |
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