Sigma SQM-160 manual Chapter Options Introduction, Installation

Chapter 3 Options

3.0Introduction

The SQM-160 has two slots to accommodate option cards. The Option A slot holds a Four Sensor Card, which expands the SQM-160 inputs to a total of six quartz crystal sensors. The Option B Analog Output Card provides Rate and Thickness outputs for connection to strip chart recorders.

3.1Installation

WARNING: Hazardous voltages are present inside the SQM-160 when it is connected to a power source. Remove the power cable before opening the case to install option cards.

	Option A Card				Option B Card	Ground
						0	2
							2	0	1
						1	0
						1
3	4	5	6	Rate		Thick
Sensor 1	Sensor 2		RS-232		Relay I/O	Line Fuse
						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

Remove	Use a 1/16” hex driver to remove the four screws that attach
Top Cover.	the top cover to the chassis. Remove the top cover.
Remove Option	Use a 1/16” hex driver to remove the two 4-40 back panel
Cover Plate	screws that hold the option cover plate. Save the screws.
	Remove the option cover plate.
Insert	Insert the option card, from the inside, through the rear panel
Option Card	opening. Option A slot is for the Four Sensor Card, Option B
	slot is the Analog Output Card. Align the 36-pin option card
	connector with the mating pins on the main board. Press the
	option card connector onto the main board pins.
Secure	Secure the option card to the rear panel with the screws saved
Option Card	in Step 2, and to the main board with the supplied 4-40 screw.
Replace Top	Replace the top cover, and attach it to the chassis with the four
Cover	screws from Step 1.

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