HP8591A测量不稳定该怎么办？

嗨Dirk - 尝试按频率键并输入-2001 Hz，然后输入Cal，More，Cal Freq＆amp;
振幅。
我可能没有关键序列正确，因为我面前没有8591A。
通过输入此密码，分析仪将绕过仪器固件执行的初始频率精度测试。
让它运行，看看内部校准是否运行。
如果不是，如果注入1.2 GHz或1.5 GHz信号，频率是否会跳跃？
当信号以1 GHz跳变时，如果将跨度更改为10.01 MHz而不是10 MHz会发生什么？
我相信第一个I.F.
是2121.4 MHz，所以你可以将分析仪调到1 GHz，进入零跨度，然后测量第一个L.O.
在单独的频谱分析仪上。
L.O.
应该在2121.4 MHz + 1000 MHz = 3121.4 MHz并且稳定，是吗？
希望这有帮助 -



     以下为原文

  Hi Dirk -

Try pressing the Frequency key and enter -2001 Hz, then Cal, More, Cal Freq & Amplitude.  I may not have the key sequence correct because I do not have an 8591A in front of me.  By entering this pass code, the analyzer bypasses an initial frequency accuracy test that the instrument firmware performs.  Let this run and see if the internal calibration operates.  

If not, does the frequency jump around if you inject a 1.2 GHz or 1.5 GHz signal?  When the signal is jumping at 1 GHz, what happens if you change the span to 10.01 MHz versus 10 MHz?  I believe the first I.F. is 2121.4 MHz, so you could tune the analyzer to 1 GHz, go into zero span and then measure the 1st L.O. on a separate spectrum analyzer.  The L.O. should be at 2121.4 MHz + 1000 MHz = 3121.4 MHz and stable, is it?

Hope this helped -

您还可以使用-37 Hz的用户级服务密码（跳过300MHz校准信号有效性检查），然后使用[CAL]，[更多]，[Cal Freq＆amp;
AMPTD]。
当300MHz信号由于不良校准数据而偏离频率时也可以使用。



     以下为原文

  You could also use the user level service passcode (to skip the 300MHz Cal Signal validity check) of -37 Hz, then [CAL], [More], [Cal Freq & Amptd]. This too can be used when the 300MHz signal is way off frequency due to bad cal data.