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点数如何影响CW时间扫描？
我有一个CW扫描设置来查看B / A与1kHz IFBW和11 pts的比率。 使用此设置，扫描时间约为35毫秒。 我希望扫描时间为25ms，因此我将点数降低到7.我无法增加IFBW，因为信号会变得嘈杂。 通过将点数从11减少到7，我失去了什么？ 谢谢。 以上来自于谷歌翻译 以下为原文 How does the number of points affect a CW time Sweep? I have a CW sweep setup to look at the ratio of B/A with a 1kHz IFBW and 11 pts. With this setup the sweep time is around 35ms. I would like the sweep time to be 25ms so I've lowered the number of points down to 7. I cannot increase the IFBW as the signal becomes to noisy. Am I losing anything by reducing the number of points from 11 to 7? Thanks. 
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4个回答
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CW扫描中的扫描时间与点数直接相关。
如果您设置了CW扫描，然后进入扫描时间对话框并将扫描时间设置为0，则该值将被限制（限幅）到给定IFBW和点数的最小扫描时间。 因此，如果您将该数字除以扫描中的点数，您将获得该设置的每个点的最小扫描时间。 现在如果增加减少点数，则扫描时间会相应改变。 以上来自于谷歌翻译 以下为原文 the sweep time in a CW sweep is directly related to the number of points. if you setup a CW sweep and then go into the sweep time dialog and set the sweep time to 0, the value will be limited (clipped) to the minimum sweep time possible for the given IFBW and number of points. so if you take that number and divided by the number of points in the sweep, you will get the minimum sweep time per point for that setup. now if you increase of decrease the number of points, then the sweep time will change accordingly. |
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更直接地说：对于大多数IF BW显示的CW扫描时间=（点数）/（IF BW）CW周期时间=扫描开销+（点数）/（IF BW）扫描开销包括写入显示，更新
标记，回扫（CW扫描不多），根据设置，在10到200毫秒之间，大多数是10-20毫秒。 消隐显示屏并使用仅限远程命令可以加快速度。 在11点，您有11毫秒的数据采集，似乎24毫秒的扫描开销。 根据您要做的事情，有更好的方法来获取有关响应的实时映射的信息，而不是尝试在CW模式下快速读取数据。 最好的方法是创建CW扫描，捕获整个时间窗口，每个点代表一个数据样本。 开始扫描并收集所有数据，最后将其排序。 这是有多少人做共同的功能，例如频道发声，例如。编辑：Dr_joel于2012年7月11日下午10:20 以上来自于谷歌翻译 以下为原文 To put it more directly: for most IF BW's Displayed CW sweep time =(Number of Points)/(IF BW) CW cycle time =Sweep Overhead+ (Number of Points)/(IF BW) Sweep Overhead includes writing to the display, updating markers, retrace (not much on CW sweeps) and is between 10 and 200 msec depending upon setup, mostly toward 10-20 msec. Blanking the display and using remote only commands can speed this up. At 11 pts, you have 11 msec of data taking, and it seems 24 msec of sweep overhead. Depending upon what you are trying to do, there are much better ways of obtaining information about real-time mappings of response, rather than trying to read data quickly in CW mode. Best method is to create CW sweeps that captuer the entire time window with each point representing one-data sample. Start the sweep and gather all the data tehn sort it out at the end. This is how many people do common functions such as channel sounding, for example. Edited by: Dr_joel on Jul 11, 2012 10:20 PM |
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脑洞大赛9 发表于 2019-5-8 10:06 如果有更好的方法来解决我们想要做的事情，请告诉我。 我们正在以固定频率监测相位变化。 没有应用校准。 在轨迹上放置一个标记，用SENS：SWE：MODE SING：* OPC读回相位和增益。 CALC1：MARK1：Y？ 我看到了一些关于Fast CW和FIFO模式的信息，但我们没有这个选项。 PNA-X是否具有内置功能，我们是否只需要许可证才能使用该选项？ 以上来自于谷歌翻译 以下为原文 Let me know if there is a better way for what we are trying to do. We are monitoring changes in phase at a fixed frequency. There are no calibrations applied. A marker is placed on the trace and the phase and gain are read back with SENS:SWE:MODE SING:*OPC? CALC1:MARK1:Y? I saw some information about Fast CW and FIFO mode but we do not have that option. Does the PNA-X have the capability built in and would we just need a license to use that option? |
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就像拔牙一样：你在测量什么，它经常变化多久，你监测的持续时间有多长？
有很多方法可以做，很多都取决于应用程序。 答案可能是“正在测试电缆的相位稳定性，因为它缠绕在汽车的主轴上，以确定有线电视是否可以硬连接到短距离的车辆。我们需要每10毫秒测试一次 年。” 你的代码：SENS：SWE：MODE SING：* OPC？ CALC1：MARK1：可能是最慢的方法，但是最简单的方法。 快速CW和FIFO模式是最快的模式，允许5个通道的每秒最多400,000点数据读取，并且如果需要非常长的记录，则可以流式传输到文件。 它是一种常用于近场天线测距的软件选项。 以上来自于谷歌翻译 以下为原文 Like pulling teeth: What are you measuring, how often does it change, how long of duration are you monitoring? There are tons of ways to do things, and a lot depends upon the application. An answer might be in the form of "were testing the phase stability of a cable as it wraps around a spindle of a car to determine if the cable TV can hardwired to a vehicle of short distances. We need to test every 10 msec for 1 year." Your code: SENS:SWE:MODE SING:*OPC? CALC1:MARK1: Is probably the slowest method, but is the simplest. Fast CW and FIFO mode is the fastest mode and allows up to 400,000 points per second data reads for 5 channels of deate, and can be streamed to a file if very long records are need. It is a software option used commonly in near-field antenna range measurement. |
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