E4438C输出级别问题

请尝试升级到固件版本5.77，这可能会解决您的问题。
迈克尔



     以下为原文

  Please try upgrading to firmware verison 5.77, this may resolve your issue.

                                   Michael

不幸的是升级到C.05.77并没有解决我的问题。
固件版本C.05.28和C.05.76之间的命令语法一定有一些变化，现在一些命令以不同的方式作出反应（例如：POW：LEV：IMM：OFFSET，现在我必须设置另一个偏移值
之前获得相同级别的显示读数）。
我没有找到任何更新的SCPI参考手册，因此我认为命令的语法仍然相同。比较这两组命令，在这两种情况下，发生器应设置-22.3 dBm的输出电平：* RST;
：SOUR：POW：LEV：IMM：AMPL -22.3 dBm：SOUR：POW：ATT？：SOUR：POW：ALC：LEV？发电机的答案是ALC = -2.3 dBm，ATT = 20 dB。
当我尝试手动设置这些值时，生成器会报告错误消息-222。
我确信这一系列命令在过去运行良好，但现在不是：* RST;
：SOUR：POW：ATT 20：SOUR：POW：ALC：LEV -2.3DB在之前的电子邮件中，我报告有问题的衰减器设置是20 dB和30 dB，现在在FW升级之后（有趣地）10 dB
和20分贝。
马丁



     以下为原文

  Unfortunately the upgrade to C.05.77 has not solved my problem. There must have been some change in the commands syntax between firmware versions C.05.28 and C.05.76 and some commands now react in a different way (e.g. :POW:LEV:IMM:OFFSET, where now I have to set another offset value than before to obtain the same level display reading). I have not found any updated SCPI Reference Manual, thus I suppose the syntax of the commands is still the same.

Compare these two sets of commands, in both cases the generator should set the output level of -22.3 dBm:
*RST;
:SOUR:POW:LEV:IMM:AMPL -22.3 dBm
:SOUR:POW:ATT?
:SOUR:POW:ALC:LEV?

The answer from the generator is ALC = -2.3 dBm and ATT = 20 dB. When I'm trying to set these values manually, the generator reports the error message -222. I'm sure that this sequence of commands worked fine in the past, but now it is not:

*RST;
:SOUR:POW:ATT 20
:SOUR:POW:ALC:LEV -2.3DB

In the previous e-mail, I reported that the problematic attenuator settings are 20 dB and 30 dB, now after the FW upgrade it is (interestingly) 10 dB and 20 dB.

Martin

尝试SOUR：POW：AMPL -22.3DBM



     以下为原文

  Try  SOUR:POW:AMPL -22.3DBM

大家好，这个问题已经解决了。
有两件事 - 首先，内部振荡器被破坏，同时，一些GPIB命令确实没有正确响应（独立于损坏的振荡器）。
升级到固件C.05.78后，振荡器已修复并且错误消息消失（请参阅Agilent网站上此FW版本的发行说明）。
马丁



     以下为原文

  Hi all,

the problem has been solved. There were two things - first, the internal oscillator was broken and in the same time, some GPIB commands really did not respond properly (independent of the broken oscillator). The oscillator was repaired and the error messages disappeared after upgrading to firmware C.05.78 (see the Release notes of this FW version at the Agilent website).

Martin