China Electronics Technology Instruments AV3672 Series, Руководство пользователя

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10 Fault Diagnoses and Repair
10.2 Fault Diagnosis and Troubleshooting
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check external wires for any failure; power on the instrument again and restart it after trouble-shooting. If the 220V
AC power input is normal, check whether the power switch on the rear panel of the instrument is turned on. Under
normal conditions, the power switch should be in the “
丨 ” state. If the fault is caused by the power supply of the
instrument, send the instrument to the manufacturer for repair.
10.2.1.2 The system cannot be enabled after start-up.
If the system cannot be enabled after start-up, first check whether the hard disc on the rear panel is loose. If the
hard disc is loose, tighten the fixing screw or pull out and reinsert the hard disc. If the hard disc is not loose,
recover the system. For specific steps, refer to “
3.1.2.1 System Recovery of Network Analyzer
”.
10.2.1.3 The network analyzer software cannot be used after start-up.
If the network analyzer software cannot be used after start-up and system enabling, double-click the desktop icon
of the vector network analyzer or press the [Reset] key on the front panel or click [Start] > [Programs] >
[Vector network analyzer] to start the program. If the software can be started smoothly, install the antivirus
software to kill viruses and restart the instrument. If the software cannot be started automatically, download the
vector network analyzer program and double-lick the vector network analyzer installation program in the root
directory of Disc D or E. Reinstall the vector network analyzer program with reference to “
3.1.2.2 Updating of
Network Analyzer
”.
10.2.2 Curve Display Anomaly
The curve display anomaly is caused for various reasons. At first, check whether the user reset state is saved.
Click
[System] > [Custom user reset state] in the menu bar to open the [Custom user state] window.
Remove the tick in the check box in front of “Save final state as user reset state” and “Enable user reset state”.
Click OK to close the [Custom user state] window.
Press [Reset] on the front panel. The S11 curve should be
near 0 if the port is not connected with any load.
If the curve is still abnormal after the above methods are applied, contact our technical support personnel for
solutions.
10.2.3 Sweep Problems
10.2.3.1 Sweep seems stopped.
The open-circuit curve of the port seems no sweep in the reset state. This is caused by high stability and sweep
velocity of the vector network analyzer. Click
[Stimulus] > [Sweep] > [Sweep Time] , enter 20 and press ENTER.
Then you can see the sweep marker.
10.2.3.2 Sweep is stopped.
Check whether the instrument is in the HOLD state. If the instrument is in the HOLD state, modify the trigger
mode and press
[Stimulus] > [Trigger] > [Continuous sweep] or open the [Trigger] dialog box and set the
automatic trigger mode.
10.2.3.3 The white sweep marker is in the lower part of the screen.
Both ports should be swept for correction after full double-port calibration. If only the trace with the stimulus
source on Port 1 is displayed, the white marker will appear in the lower part of the screen to sweep Port 2. This is a
normal sweep state and no change is required.
10.2.4 Display Problems
If the display window is blocked by the task bar, right-click the task bar, click [Attribute], tick “Automatic hide
task bar” and click OK to close the dialog box. In this case, the task bar will be automatically hided and the test
window will not be blocked.
10.2.5 No Response of Front Panel Keys
In case of no response of front panel keys, which is caused by damage of the instrument drive program, download
the vector network analyzer and reinstall it. For specific steps, refer to “
3.1.2.2 Updating of Network Analyzer
Program
”. Select the “Complete” installation type and reinstall the drive program. If the problem still exists,