Cirrus SP101013.111 – 10 October 2012
MKS Instruments UK Ltd., Spectra Products
47
Ensure that the face of the analyser connector housing on the control unit butts up to the analyser
flange.
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.
8.6 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 36 (open) or 39 PVD).
8.6.1 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.
