emission current. System
pressure is too high
2. RS485 - page 32
Error Message - "EMIS
FAIL"
1. The desired emission
current (IE) could not be
established.
2. Gauge contamination,
possible coating on
filament or grid surfaces.
3. End of filament life
4. System pressure too high
1. Reduce pressure (if applicable)
2. Check filament current
1. Go into R&D Mode
a. MENU --> SETUP DISP --> MODE and select
RESEARCH. After going to top of menu, it
should display several things including FVI.
The first digits are filament voltage, the
second digits are current.
i.
If voltage > 1.7 V and current is > 2.5 A
at 100 uA setting, there is possible
contamination
ii.
If voltage > 2.3 V and current is > 2.7 A
at 4 mA setting, there is possible
contamination.
3. Switch to 4 mA emission current and attempt repeated
filament starts to clean filament
1. Front panel - page 24 (EMISSION SEL --> 4mA)
2. RS485 - page 32
4. Degas sensor if values exceed limits from point 2
1. Degassing basic information, page 16 of manual
2. Front Panel Control --> DEGAS ON
3. RS-485 - page 32 of manual
5. Re-check R&D Mode Values. If nothing changed, sensor
is contaminated.
6. Switch to second filament
1. Front panel - page 25 (SETUP IG --> FILAMENT
NUM --> FILAMENT 1/2)
2. RS485 - page 32
7. Check the resistance between filaments 1 and 2 (page 37)
1. Remove the ion gauge transducer from the control
module (page 78, steps 1-5)
2. Measure the resistance using an ohmmeter; a good
intact filament will have a resistance of 0.2 ohms
(page 73 of manual
8. Contact [email protected] with R&D and Resistance
Values
