Vacuum Fluorescent Display Tube (VFD) Vacuum Measurement in Tube
From 4 and 4 we can see that the electrons emitted by the filament move towards the net under the action of the accelerating pole. When the electrons pass through the net, they encounter a collector with a negative potential and then return, and they move back and forth around the net. Most of the electrons are gridded. The helium network collects that a small part of the electrons may interact with the gas molecules to produce positive ions when they move in the vicinity of the two.
- Generally the following three parameters need to be properly selected on the calibration system by selecting the appropriate thief: Select the appropriate Ie, P, and keep the value constant, change to Ua, and make a B-Ua curve, as shown. When Ua is greater than the ionization threshold, ion flow starts and gradually rises quickly. Over-wave rises slowly. Taking into account the maximum power consumption of the grid, Ua has a maximum value of lnax, which is a margin. Ua's choice is Fan L. Ltel-Lfa2. The relationship between the ion current and the collection voltage Uc: Select appropriate 丨e, P and Ua that have been determined, keep it constant, change Uc, and make a -Uc curve, as shown. When Uc is zero, electron current is collected. At the pole, there is a negative value. When it is greater than a certain value, it begins to leave the stream and gradually rises quickly. The flag rises slowly and reaches saturation. Taking into account certain spirit; the total relative error of the pressure in the VFD tube can be listed in Table 5.
Table SVFD Total relative error of in-line pressure measurement Relative error of the ion current Relative error of the emitted electron current VPD Relative error of the inter-tube distance VFD glycosidic sensitivity Relative error due to pipe absorption during calibration Calibration pressure relative error of the standard vacuum gauge VPD The total relative error of pressure measurement in glycosides. VI. Computer automatic measurement system (abbreviated). 7. Concluding remarks: VFD in-line vacuum degree non-destructive automatic testing technology has been successfully developed in VFD tube vacuum lossless automatic tester. Reliable performance, easy operation, has played an important role in production. We hope that more VFD production and application units will use this tester to bring you convenience and efficiency. You are welcome to contact us by email or contact us. We also welcome comments and suggestions.
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