e-Vision and e- LP101013.100 – 01 January 2004
MKS Instruments, Spectra Products
27
Examine the RF/analyser connector on the front of the control unit and check that
none of the gold sockets are pushed out of place.
7.4 Changing filaments
The analyser is fitted with dual filaments mounted on a single plate. Changing
filaments is the most common maintenance event with quadrupole analysers. For
this reason, the MKS Spectra analyser has been designed to make this task as quick
and easy as possible.
Below is a list of the tools and equipment you will require. We recommend that you
assemble the following items before you start. Remember that the instrument is
supplied with a tool kit that contained some of the things you will need.
small jewelers screwdriver (2mm)
pair of tweezers
small pair of smooth jawed needle nosed pliers
pair of clean cotton gloves
clean bench on which to work
Ohmmeter
clean container in which to put small parts
replacement filament
a method of holding the analyser securely in an upright position, (a small bench
vice is ideal).
pen and paper on which to make notes and sketches
Refer to the exploded views of the Filament Plate shown on Page 33.
7.4.1 Removing the filaments
1. Remove the analyser from the vacuum system making sure that you do not
touch the exposed internal surfaces and place it on the bench in an upright
position.
2. The filaments are located on the very top of the analyser and are retained by
two M2 x 4 pan head screws (Item 3). The electrical connections are made via
three barrel connectors (Item 2), one to each filament and one to filament
common.
3. Hold one of the barrel connectors firmly with your pliers and slacken the
outermost screws (Items 1 and 6) until the barrel connector can be removed from
the filament plate and the connecting lead.
4. Repeat the above for the other two barrel connectors.
