BOC Edwards Temescal SuperSource2 STIH-270-2PT, Руководство пользователя

Страница: 46 / 102

•
Se vere ox i da tion above the ar eas where the fil a ment legs con tact the fil a ment clamps. Se vere ox i -
da tion in these ar eas may in di cate that a layer of in su la tion has formed be tween the fil a ment and
the fil a ment clamps, re duc ing con ti nu ity and emit ter ef fi ciency.
7. If you re place the fil a ment, be sure to clean the V-shaped grooves in the fil a ment clamps. Use
400-grit (or finer) em ery pa per to sur face the grooves, as coarser em ery or sand pa per can roughen
the metal sur face enough to cause arc ing in the cham ber. Af ter us ing the em ery pa per, re move res i -
dues from these parts by thor oughly clean ing them, ei ther ul tra son i cally or us ing isopropyl al co hol.
8. Once the fil a ment is in stalled, use an ohm me ter to check the re sis tance be tween the two emit ter bus
bars. If the me ter reads in fin ity or a value sig nif i cantly greater than 0.3 ohms, re place the fil a ment. A
read ing of in fin ity in di cates a bro ken fil a ment. Too-great re sis tance be tween the two bus bars con -
firms that an in su lat ing ox ide layer has de vel oped be tween the fil a ment legs and the con tact ar eas
around them.
Operation
3-10 0101-9004-0A STIH-270-2PT