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我们在66年改装了成都仪器厂生产的HZJ-1型氦质谱探漏仪,以提高灵敏度。改装的方法主要是从电子线路部分考虑。就是在它的放大器部分加进一级放大,以6 J 1作为6 J 8与6 J 4之间的第三级放大。同时也采用了负反馈措施。具体线路如图。由于加了一级放大,所以增加了放大量,而采用了负反馈,降低了仪器的信噪比。对改装前后的灵敏度进行校准比较。改装前仪器的饱和点为380～400分格,改装后为560～640分格。改装前仪器的灵敏度为5×10~(-9)乇·升/秒,而改装后为2.5×10~(-10)～5×10~(-11)乇·升/秒。就我所具有的三台探漏仪改装说明灵敏度都有显著的提高,经长期使用验证仪器性能和灵敏度稳定,基本上满足现阶段检漏灵敏度的
We retrofitted the HZJ-1 helium mass spectrometer produced by Chengdu Instrument Factory in 66 years to improve the sensitivity. Modified method is mainly considered from the electronic circuit part. It is in its amplifier section plus a level of amplification to 6 J 1 as 6 J 8 and 6 J 4 between the third level of amplification. Also used negative feedback measures. Specific lines as shown. As a result of a level of amplification, so increase the amplification, and the use of negative feedback, reducing the signal to noise ratio of the instrument. Before and after the modification of the sensitivity of the calibration comparison. Before modification, the saturation point of the instrument is 380 ~ 400 divisions, after conversion, 560 ~ 640 divisions. The sensitivity of the instrument before modification is 5 × 10 -9 Torr · liter / sec, and after the modification is 2.5 × 10 -10 to 5 × 10 -1 Torr · liter / sec. All three of the leak detector retrofit instructions I have had a significant increase in sensitivity, long-term use to verify the performance and sensitivity of the instrument is stable, basically to meet the current sensitivity of the leak test