Do you own Agilent instruments? Are you still not familiar with the symptoms, possible causes and preventive measures of the instrument? Take a look at the following analysis of the causes of these models.
Fault phenomenon
There is only one step-like noise floor at startup and the high-end signal test is 10 or even 20 dBm lower.
Attenuation values ​​are chaotic and non-linear during the test.
Possible Causes
This failure is mostly caused by the loss of the calibration constants, and the loss of the calibration constants either results from the failure of the memory cell or a sudden loss of power during the self-calibration process, causing all the compensation data to be reset.
It is highly likely that the input attenuator's RF attenuator is burned.
Precaution
It is recommended that users periodically replace (detect) the battery through the maintenance department.
In addition, in the process of doing self-school to eliminate artificial reset, power off and other operations.
Prevents the access of DC signals and large signals.
Fault phenomenon
The transmission measurement under normal power-on status is normal, and the single-channel measurement is 3-5dBm lower.
The return loss curve is abnormal.
The transmission test curve in the boot-through state is anti-parabolic.
Possible Causes
It is most likely due to the intrusion of large signals or strong static electricity that caused the components of the receiver to be broken down.
It may be that the protector on the signal input is burned.
Precaution
Pre-test the measured signal of the access network analyzer test terminal.
Improve anti-static facilities and procedures.
Fault phenomenon
Unstable, self-test failed.
When the output signal frequency is less than 2.1 GHz, the unstable amplitude or frequency difference is 100 MHz.
Possible Causes
With the 006 option, the microwave module is basically damaged.
The heterodyne module is damaged.
Precaution
This module is easily burned by large signals that are externally connected in series.
Therefore, attention should be paid to grounding and static electricity protection.
Fault phenomenon
The alarm "RF unit lost lock" or "This lock is lost" appears on the power on.
Failed to start the self-check, there is an alarm to check the front panel connection.
Possible Causes
It is most likely caused by the reduced signal amplitude of the 89431A.
This is usually caused by data errors on the A91 board in the 89431A. Calibration data needs to be adjusted.
Precaution
Humid environment or not turning on for a long time.
Guarantee the annual inspection of the instrument.
Fault phenomenon
E27 alarm appears during the self-checking process.
Possible Causes
The attenuator on the instrument input board is burned, causing the signal to be submerged by noise.
Precaution
Please consider the possibility of electrostatic damage and large signal access of active devices.
Fault phenomenon
The RF input port RF IN and the antenna input ANTENNA IN receive signals are low.
Possible Causes
The RF input module was burned.
Precaution
Large signal access.
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