E4445A的常见故障现象为：
1.开不了机
2.开机报错
3.信号无输入
4.衰减器不能衰减信号
5.信号输入偏低或偏高
6.频率偏差大或者频率失锁
7.屏幕无显示或者显示异常等
8.无零频信号
9.GPIB通讯功能无作用
10.按键无功能或者部分按键无功能
The common fault phenomenon of E4445A is:
1. Can't turn on
2. Boot error
3. No signal input
4. The attenuator cannot attenuate the signal
5. The signal input is low or high
6. The frequency deviation is large or the frequency is out of lock
7. The screen has no display or abnormal display, etc.
8. No zero frequency signal
9. GPIB communication function does not work
10. The button has no function or some buttons have no function
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