Denka M3 Lab6 Cathode Standard for Philips
Standard (Round) Tips
Provided with a 90° cone and 15µ radius round tip.Flat (Truncated) Tips
Flat tips are recommended for applications where stability and long lifetime are the prime considerations, and where some degree of brightness can be sacrificed. Flat tips are available in eight configurations :
90° Cone Angle
60° Cone Angle
20µ radius
20µ radius
40µ radius
40µ radius
60µ radius
60µ radius
100µ radius
100µ radius
Sharp TipsSharp tips are recommended for applications where initial brightness is the foremost consideration and where shorter lifetime can be accepted. Sharp tips are available in two configurations.
- 60° Cone Angle
5µ radius
10µ radius
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
All standard Denka M-3 LaB6 Cathodes are provided with a 90° cone angle and a 15µm radius round tip.
- 60° Cone Angle