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Chapter 3 Options
3-1
3.0 Introduction
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.
3.1 Installation
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.
Remove
Top Cover.
Use a 1/16” hex driver to remove the four screws that attach
the top cover to the chassis. Remove the top cover.
Remove Option
Cover Plate
Use a 1/16” hex driver to remove the two 4-40 back panel
screws that hold the option cover plate. Save the screws.
Remove the option cover plate.
Insert
Option Card
Insert the option card, from the inside, through the rear panel
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
Option Card
Secure the option card to the rear panel with the screws saved
in Step 2, and to the main board with the supplied 4-40 screw.
Replace Top
Cover
Replace the top cover, and attach it to the chassis with the four
screws from Step 1.
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
Rate Thick
3
4 5
6