How can I prevent damage to my spectrum analyzer?

The test environment of the instrument is very important: use the appropriate power cord, ground the product, connect the signal cable correctly, check all terminal ratings (and do not exceed the rated value during use), do not operate at will when the product is suspected of failure, use appropriate overvoltage protection, carry out anti-static protection, maintain good ventilation, avoid exposed circuits, work without opening the cover, use suitable fuses, keep the surface of the product clean and dry, and do not operate in ichaoshi environment, flammable and explosive environment, Pay attention to handling safety.

After the main program is run, there is no track, the cargo track is not refreshed, or the refresh is not normal. First of all, turn on the frequency scale, if there is a change in the frequency scale, it may be due to setting reasons, such as the track display format is linear or the reference level.

Causes the track to be at the bottom of the screen, so you can't see it. If the frequency indicator reading is not understood and there is an error message from the DSP program** in the error list, it is because of the DSP device failure. If the power is off and the machine is turned on for 1 minute and the problem cannot be solved, please contact Xi'an Antai Instrument Maintenance Center for repair.

If there is no ** error prompt, it may be a track return error, contact the maintenance service center Antai Instrument Repair for DSP processing board repair. If the trajectory does not refresh or the refresh is not normal, see whether the trigger setting is free trigger mode, whether the scanning mode is continuous mode, and whether the trajectory is set to "display trajectory" FFT mode (fast Fourier transform.

mode) while entering a stable single-frequency signal while the spectrum analyzer.

The trajectory is beating. Determine whether the "IF Overload" prompt appears in the upper right corner of the grid area of the screen at this time, if this information means that the input signal is too large, and the input attenuator is set to become larger at this time, which can solve the fault.

Spectrum analyzer failure phenomenon: In addition to the common start-up display failure, there is also a major fault, and the spectrum analyzer is out of lock fault; The following is shared by the maintenance engineer of Antai spectrum analyzer and the steps of repairing the loss of lock

Lock-out is usually manifested by a signal frequency that deviates from the set position, or when the signal is not visible or carries a significantly large parasitic signal. Due to the complexity of the local oscillator circuit of the spectrum analyzer, it involves circuits and microwave components such as reference ring board, frequency synthesis board, microwave driver board, narrowband intermediate frequency board, YTO, local oscillator frequency doubling amplification assembly, directional coupler, etc. The first thing to do is to confirm that the circuit unit is faulty.

Analysis process: The local oscillator signal source of the spectrum analyzer develops from free oscillation to frequency synthesis, so first input 2GHz and 6GHz signals respectively, if the lock is lost at 2GHz and the lock is not lost at 6GHz, it means that the first local oscillator is normal and the second local oscillator is out of lock; If both frequencies are out of lock, it may be the first original oscillator out of lock or the first.

First, the second oscillator is locked. The schematic diagram is as follows:

1) Judge whether it is the first original oscillator loss lock, check according to the "first original oscillator preset", if it is not normal, follow the inspection steps in the first original oscillator preset debugging, if it is normal, then proceed to the next step.

2) Judge whether it is the second local oscillator loss lock, check according to the "second local oscillator preset", if it is not normal, then follow the inspection steps in the second local oscillator preset debugging, if it is normal, then proceed to the next step.

3) Judge whether the third local oscillator is normal or not, if this local oscillator is out of lock, it is actually the 100MHz crystal oscillator that is locked abnormally. At this time, the external 100MHz is measured, and if the signal jitter is abnormal at this time, it may be that the 100MHz crystal oscillator is out of lock.

4) To determine whether the fourth local oscillator is normal, this oscillator is a crystal oscillator, if the lock may deviate from the century frequency point of about 20kHz, the frequency width of the spectrum analyzer should be set to be small enough, about 100kHz to be observed.

As a precision measuring instrument, the maintenance of AgitekService spectrum analyzer is not a moment, but is reflected in the use of the process, the following is the introduction of precautions in use, to prolong the service life!

The use of spectrum analyzer to measure the system index, generally only need to directly connect the spectrum analyzer to the system, and then operate according to the measurement method of the index, in the measurement process, especially need to pay attention to the following problems.

1) Adjust the size of the signal input.

If the input of the spectrum analyzer is too high, the analyzer will cause it to produce nonlinear distortion, and the test results will be incorrect due to distortion; If the signal level is too low, the signal may be masked by the analyzer's noise floor and the signal cannot be measured correctly, both of which can reduce the dynamic range of the measurement. Therefore, it is necessary to have a clear understanding of the input range of the signal and select the input attenuation correctly before use.

When the RF signal is input, it should also be noted that the characteristic impedance of the cable matches the input impedance of the instrument, otherwise the signal mismatch will cause attenuation and measurement error. In the cable TV system, the characteristic impedance of the cable is generally 75, and the input impedance of the analyzer can generally be selected between 50 and 75, so the input impedance of the analyzer should be correctly selected when measuring to reduce the measurement error.

2) Distinguish the choice of bandwidth.

In the spectrum analyzer, the frequency resolution is a very important concept, it is determined by the bandwidth of the IF filter, this bandwidth determines the resolution bandwidth of the instrument BWRES, if the bandwidth of the filter is 100Hz, then the spectral line frequency has 100Hz indefiniteness. If there are two lines in the bandwidth frequency range of a filter, it is not possible to detect that the two lines are different frequency components, but its energy in the frequency range will be measured regardless of how many lines produce this energy, so the resolution of two closely related lines depends on the width of the filter.