MG14 operating manual Rev 1.4
42
7. APPENDINX
7.1 Trouble shuttings
– error massages
L.p.
Error message
Description
Solution
1.
“NO EMISSION”
Emission is not possible
- check gauge connection,
- exchange the B-A gauge
cable,
- exchange the B-A cable,
- pressure to high,
- turn emission on again
2.
“HV FAILURE”
No high voltage on gauge
anode, or more
than ±10V of
differences from 180V ( 500V
for degas)
- check gauge connection if
there is no shortcut,
- exchange the B-A gauge
cable,
- turn emission on again
3.
“ OVERPREASURE”
Measure pressure excide
critical value >1x10
-3
mbar
- check iv there is no leak in
the system,
- wait till pressure reach
minimum value,
- turn emission on again
4.
“ OVERTEMERATURE”
Temperature inside device too
high (> 80
o
C)
- turn emission off
– let the
device cool down,
- check if louvers of the
device are not locked,
- be sure that air flow
around device is proper
–
check inside cabinet
temperature if device is
mounted in the rack
5.
“CATHODE OPEN”
No current in cathode circuit
- check gauge filament if is
not open,
- check gauge connection,
- exchange gauge cable,
- turn emission on again
6.
“CATHODE SHORT”
Current in cathode circuit too
high. Emission current can not
be reached
- check filament if there is
no connection to the
ground or other pins,
- check gauge cable if there
no shortcuts,
- exchange gauge cable,
- turn emission on again
7.
“Ubias FAILURE”
Bias voltage ( filament potential
) different
more than ± 10%
- check gauge cable if there
no shortcuts,
- check gauge connection,
- exchange gauge cable,
- turn emission on again
- turn the device off, wait
10s and turn device on
again
8.
“+24V FAILURE”
+24V supply voltage different
more than ± 10%
- turn the device off, wait
10s and turn device on
again