8753ES上A，B和R接收器的最大输入电平是多少？

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dB / dB可能是一个错字，如果我没记错的话应该是dB / 10 dB，但规格是基于参考指南中的动态精度曲线。
如果您进行被动测量，则校准后不应更改功率，R通道的线性度无关紧要。
但是，低于5 dBm端口功率（在分离器电路20 dB损耗后约为-15 dB R信道功率），几乎没有线性误差。
R通道的填充比A / B大约10 dB，因此等效电平为0 dBm测试端口（约-16 dB A / B功率电平）。



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  dB/dB is probably a typo, it should be dB/10 dB if I remember correctly, but the spec is actualy based on the dynamic accuracy curve found in the ref guide.  

If you are making passive measurements, you shouldn't change power after calibration and the linearity of the R channel doesn't matter.   However, below 5 dBm port power (about -15 dB R channel power after the 20 dB loss of the splitter circuit), there is virtually no linearity error.  The R channel is padded about 10 dB more than the A/B, so the equivalent level would be 0 dBm test port (about -16 dB A/B power level).

> {quote：title = Dr_joel写道：} {quote}> dB / dB可能是一个错字，如果我没记错的话应该是dB / 10 dB，但规格是基于参考指南中的动态精度曲线实际的
。
嗨Joel，>如果您正在进行被动测量，则校准后不应更改功率，R通道的线性度无关紧要。
但是，低于5 dBm端口功率（在分离器电路20 dB损耗后约为-15 dB R信道功率），几乎没有线性误差。
你有没有忘记那里的“m”，R输入端口的平均值为-15 dBm，几乎没有线性误差，或者我误解了你？
我很欣赏如果功率没有改变，R通道的线性度无关紧要。
> R通道的填充比A / B大约10 dB，因此等效电平为0 dBm测试端口（约-16 dB A / B功率电平）。
再说一遍，你在A和B接收器端口上说-16 dBm几乎没有线性误差吗？
戴夫



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  > {quote:title=Dr_joel wrote:}{quote}
> dB/dB is probably a typo, it should be dB/10 dB if I remember correctly, but the spec is actualy based on the dynamic accuracy curve found in the ref guide.  

Hi Joel, 

> If you are making passive measurements, you shouldn't change power after calibration and the linearity of the R channel doesn't matter.   However, below 5 dBm port power (about -15 dB R channel power after the 20 dB loss of the splitter circuit), there is virtually no linearity error.  

Did you forget an "m" there, and mean -15 dBm on the R-input port with virtually no linearity error, or have I mis-understood you? 

I appreciate if the power is not changed, the linearity of the R-channel doesn't matter. 

> The R channel is padded about 10 dB more than the A/B, so the equivalent level would be 0 dBm test port (about -16 dB A/B power level).

Again, are you saying -16 dBm on the A and B receiver ports with virtually no linearity error? 

Dave

戴夫，如果你看一下在线服务手册，性能测试部分将回答你关于所有三个端口的线性误差和幅度和相位压缩误差的所有问题。
85046中的耦合器具有高于3.4 GHz的弱点，因此您的测量结果将是有问题的。
85047测试装置基本上添加了标准装置中的端口耦合器。
对于B和C型号，它有一个倍增器。
问候，戴夫



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  Dave,

If you look at the on line service manual, in the performance test section will answer all your questions concerning linearity error and compression error in both amplitude and phase for all three ports.

The couplers in the 85046 have weakness above 3.4 GHz therefore you measurements will be questionable.  The 85047 test set basically added the port couplers found in a standard unit.  It had a doubler in it for the B and C models.

Regards,

Dave

> {quote：title = dhamilton写道：} {quote}> 85046中的耦合器在3.4 GHz以上有弱点，因此您的测量结果会有问题。
85047测试装置基本上添加了标准装置中的端口耦合器。
对于B和C型号，它有一个倍增器。
>在85046中Dave the -bridges-（让我们在这里准确）最初设计用于1.3 GHz 8505，后来进行了扩展以获得3 GHz的性能。
所以它们完全超过3 Ghz。
85047A的桥接器采用全新设计，运行速度可达6 GHz。
对于第一版RF PNA，它们被拉伸至9 Ghz。
后来，进行了重大的重新设计，将它们拉得更远，首先是20 GHz（对于PNA-L），然后是26.5 GHz（对于PNA和PNA-X中的Ref桥）。
所有这些都是桥梁，而不是耦合器。
85046桥是等值的惠斯通，具有6 dB的损耗和耦合。
85047桥是不等腿的小麦，具有16 dB耦合和1.57 dB（标称）损耗。
有关桥梁的更多细节，你知道在哪里看......（第83页显示了85047桥梁的精美图片）。



     以下为原文

  > {quote:title=dhamilton wrote:}{quote}
> The couplers in the 85046 have weakness above 3.4 GHz therefore you measurements will be questionable.  The 85047 test set basically added the port couplers found in a standard unit.  It had a doubler in it for the B and C models.
> Dave

the -bridges- (let's be precise here) in the 85046 were originally designed for the 1.3 GHz 8505, and later stretched to get 3 GHz performance.  So they fall apart completely above 3 Ghz.

The bridges in teh 85047A are of a completely new  design, and operate well to 6 GHz.  They were stretched to 9 Ghz for the first version of the RF PNA.

Later, there was a significant redesign that stretched them much farther, first to 20 GHz (for the PNA-L) and then to 26.5 GHz (for the Ref Bridge in the PNA and PNA-X).

All of these are bridges, not couplers. The 85046 bridges are equal value wheatstone with 6 dB loss and couplng. The 85047 bridges are unequal leg wheatsones with 16 dB coupling and 1.57 dB (nominal) loss.

For more detail on the bridges, you know where to look... (pg 83 shows a nice picture of the 85047 bridge).