Sigma SQM-160 manual Chapter Quick Start System Connections, System Components

Chapter 1 Quick Start

1.4System Connections

The diagram and table below identifies typical vacuum system components and their function.

S e n s o r

I n - V a c
C a b l e	S o u r c e
	S h u t t e r
F e e d t h r o u g h
6 " B N C C a b l e

G r o u n d W i r e

O p t i o n A C a r d		O p t i o n B C a r d	G r o u n d
			110	220	0	1
S e n s o r 1 S e n s o r 2	R S - 2 3 2	R e l a y I / O	L i n e F u s e
			Fuse 1/2 A SB at 120VAC
Manufactured By	Model No. SQM-160		Fuse 1/4 A SB at 240VAC
S i g m a	Ser No. 80901
Σ instruments

O s c i l l a t o r	1 0 ' B N C C a b l e
	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.

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