Agilent Technologies 7820A Manual page 228

11
Maintaining the NPD
228
Use a cotton swab wetted with solvent to clean the residue
19
from the inside of the collector and around the jet. If the
collector appears very dirty, replace it with a new one.
Install the bottom metal C-ring, the lower ceramic insulator,
20
and the top metal C-ring. See
Install the collector.
21
22 Install the upper ceramic insulator and top metal C-ring
above the collector. See
Install the lid, making sure that the NPD lid standoffs are in
23
their slots. Hold the lid flat while each of the screws is
tightened until they touch the lid. Tighten each screw evenly,
1/2 turn at a time, until tight. Do not overtighten.
24 Slide the electrometer interconnect into the slot on the lid
and lower the electrometer into the mounting tray. Be careful
not to touch or bend the spring.
Figure 6.
Figure 7.
Maintaining Your GC