39,766
edits
Neon Lamps: Difference between revisions
Jump to navigation
Jump to search
no edit summary
(Created page with "Neon lamps are used for at least two different things in Tek instruments: # Indicator lamps, e.g., for power # Voltage clamp, similar to how a zener diode is used Neon lamps...") |
No edit summary |
||
| Line 1: | Line 1: | ||
Neon lamps are used for at least | '''Neon lamps''' are used for at least three different things in Tek instruments: | ||
# Indicator lamps, e.g., for power | # Indicator lamps, e.g., for power, beam position, or uncalibrated status | ||
# Voltage clamp, similar to how a zener diode is used | # Voltage clamp, similar to how a zener diode is used | ||
# In relaxation oscillators, e.g. in 7000-series power supplies | |||
[[File:585-neon-1.jpg|thumb|right|Broken lead (left) on neon in [[585]] time base]] | |||
Neon lamps fail more than most other components. | Neon lamps fail more than most other components. | ||
A common failure mode is for the leads to break off. | A common failure mode is for the leads to break off, often close to the glass bulb, due to corrosion and vibration. | ||
Another failure mode is for the I-V characteristic to drift. | Another failure mode is for the I-V characteristic to drift. | ||
Neon lamps are used as a voltage clamp in the CRT circuit for setting the CRT grid voltage in many Tek instruments. | |||
A typical example is seen in the [[561A]]: | Neon lamps are used as a voltage clamp in the CRT circuit for setting the CRT grid voltage in many Tek instruments. A typical example is seen in the [[561A]]: | ||
[[File:Tek_561a_crt_schem.png|200px]] | [[File:Tek_561a_crt_schem.png|200px]] | ||
If the neon lamps fail, the CRT grid voltage will be affected. | If the neon lamps fail, the CRT grid voltage will be affected. | ||
When in doubt, replace the neon lamps. | |||
Another common use is for DC bias shifting, e.g. in 500-series timebase circuits. | |||
[[File:Neons in 545 timebase circuit.jpg|200px]] | |||
When in doubt, replace the neon lamps. In a pinch, it may be possible to [[Media:585-neon-2.jpg|reattach broken leads]] after careful grinding of the glass. | |||
==Types and data== | |||
* NE-23 ''pls add data'' | |||
* ... | |||
[[Category:Repair issues]] | [[Category:Repair issues]] | ||