Hollow cathode lamp use instructions

Hollow cathode lamp use instructions

1. The selection of the best current, the maximum current given in the performance parameter table refers to the maximum average current that can be applied. When applying a modulating waveform, the peak current should be limited to four times the maximum current range. Use above the current maximum will severely shorten the life of the lamp or cause permanent damage. The operating current of the lamp should be the optimum combination of light intensity, signal-to-noise ratio and lamp life. For some elements, a higher signal-to-noise ratio and a lower detection limit can be provided at higher currents, but this will inevitably cause Analyze the loss of sensitivity and the reduction in lamp life. Due to the broadening effect of the high current line, it can also cause severe bending of the calibration curve. Of course, working at a current with a low recommended operating current value, although the life of the lamp can be extended, the light intensity is lowered and the signal-to-noise ratio condition is deteriorated. As the use time increases, the radiation intensity of the lamp also decreases, so it is also necessary to appropriately increase the current used. Our products have been marked with working current and maximum operating current, but this value is for user's reference only, because the instruments used by each unit are different, the design of instrument light power supply, DC power supply, square wave power supply, pulse power supply, etc. They have different effects on the use of the lamp. Therefore, before the lamp is used, the best lamp current selection experiment should be made according to the requirements of the stability and sensitivity of the lamp within a given range of lamp current. Operating Current - when it can provide sufficient energy to the host, as far as possible with a small current, smaller self-absorption of the emission time, the higher the measurement sensitivity and linearity range expansion, but also to extend the life of the lamp of energy further. Depending on the passband width ( or slot width ) of the monochromator , these three factors should be properly matched to give better sensitivity and stability .

2, in use, inside the lamp housing gradually deposited metal sputtering, after the new lamp aging process has been deposited, this is normal. Deposit many elements have opaque still be used normally.

3, during storage, is regularly allowed point, normal lamp gas purity is not necessary, no effect on normal lamp light does not reverse process - usually with a purification (physical or chemical hydrogen-absorbing oxygen. gas such as nitrogen) is made of metal anode, a cathode only when acting only as a cathode was found pale orange-red neon light (strength is reduced), can reverse process, the host may be utilized with a reverse power lamp socket It can be carried out . The current can be used 10-20 mA for about 2-4 hours . Note : Alkali metals other than alkali metals and magnesium are not reversed .

4. Because the deposited alkali metal causes the shield of the lamp to short-circuit with the cathode to emit light , it can vibrate to short-circuit the short circuit .

5, end of life phenomena - termination cause the normal life is insufficient to maintain the consumption of neon normal discharge, the cathode emission phenomenon only estuary, the lamp current is almost zero, the intensity is not substantially zero recovery method can still be terminated before. Normal use .

6, the use or storage time is long, please first stabilize the stability and energy with the current of 1/3-2/3 of the maximum current for 30min .

7, the life of the lamp, we mark the life of the lamp as 5000 mAh, but the life of the high melting point metal element lamp far exceeds this value, up to tens of thousands of milliampere hours, such as iron lamp up to 14000 Above mAh, the magnesium lamp can reach 20,000 mAh or more, and the zinc lamp can reach 10,000 mAh or more. For the arsenic, selenium and other volatile elements, we measured the actual use time of more than 400 hours, so the life standard of 3000 millihours is more than enough.

Welcome to the unit 8 patented high-performance hollow cathode lamp (three-electrode) especially for: a particularly useful type double beam Zeeman Panels b and arsenic, all of 8 kinds of weakly emitting element hydride normal light emission intensity ratio. High , high sensitivity , linear range expansion, adjacent line spectral interference disappears