| |
Flat Tip |
Standard (round) Tip |
Sharp Tip |
| Brightness |
About 5 times that of tungsten,
2-5x105 A/cm2· Str |
About 10 times that of tungsten,
1x106 A/cm2· Str |
Twice as bright as standard tips
2x106 A/cm2· Str |
| Saturation |
Mono spot at about 1,400°C |
Mono spot at about 1,500°C. |
Almost the same as standard tips |
| Crossover |
Large (11-13µ) |
Small (7-10µ) |
Small (7-10µ) |
| Angular distribution |
Broad, 3.3-4.2x10-2 rad |
Sharp1.6 x10-2 rad |
Sharp1.6 x10-2 rad |
| Used Temperature |
Low temperature |
Low temperature |
High temperature. |
| Lifetime |
Long life; usable at low temperatures and crystallized end changes slowly. |
Long life but shorter than flat tips. |
Short |
| Operation |
Easy; thanks to its large spot size and broad adjusting range. |
Not so difficult. |
Difficult; Point adjustment needed! |
| Stability |
High; vulnerable to thermal expansion or vibration. |
High |
Middle;. Vulnerable to the thermal expansion or vibration. Adjustment is sometimes necessary. |
| Technology Needed |
Ordinary |
High |
Very high |