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Chapter 1 Quick Start
1-4
1.4 System Connections
The diagram and table below identifies typical vacuum system components and their
function.
System Components
Sensor Holds the quartz crystal used to measure rate and thickness.
Crystals must be replaced occasionally.
In-Vac Cable A coax cable, typically 30” long, that connects the sensor to the
feedthrough.
Feedthrough Provides isolation between vacuum and atmosphere for
electrical and cooling lines.
6” BNC Cable Provides a flexible connection from the feedthrough to the
oscillator. Keep this cable as short as possible.
Oscillator Contains the electronics to operate the quartz crystal. Total
cable length to the crystal should be under 40”.
10’ BNC Cable Connects the oscillator to the SQM-160. Lengths up to 100’
are acceptable.
Ground Wire A wire, typically braided, that connects the vacuum system to
the SQM160 ground terminal.
Sensor
Feedthrough
In-Vac
Cable
6" BNC Cable
Oscillator
10' BNC Cable
Source
Shutter
Ground Wire
Fuse 1/2 A SB at 120VAC
Fuse 1/4 A SB at 240VAC
Line Fuse
Manufactured By
Σ
Model No. SQM-160
Ser No. 80901
instruments
Sigma
Sensor 1 Sensor 2
RS-232
Option A Card
Relay I/O
Option B Card
220
110
10
Ground