Thermo Scientific 5028i Instruction Manual page 226

System Description
Electronics
Electronics
Motherboard
Measurement Interface
Measurement Interface Board
8-6 Model 5028i Instruction Manual
All electronics operate from a universal switching supply, which is
capable of auto-sensing the input voltage and working over the all
specified ranges.
External pumps and heaters all operate on 220 VAC. An optional
transformer is required if operating on the 110VAC.
An on/off switch controls all power to the analyzer and is accessible on
the front panel.
The motherboard contains the main processor, power supplies, and a
sub-processor, and serves as the communication hub for the instrument.
The motherboard receives operator inputs from the front panel function
keys and/or over I/O connections on the rear panel. The motherboard
sends commands to the other boards to control the functions of the
instrument and to collect measurement and diagnostic information.
The motherboard outputs instrument status and measurement data to
the graphics display and to the rear-panel I/O. The motherboard also
contains I/O circuitry and the associated connector to monitor external
digital status lines and to output analog voltages that represent the
measurement data. Connectors located on the motherboard include:
External connectors include:
External Accessory
l
RS-232/485 Communications (two connectors)
l
Ethernet Communications
l
I/O connector with Power Fail Relay, 16 Digital Inputs, and 6
l
Analog Voltage Outputs.
Internal connectors include:
Function Key Panel and Display
l
Measurement Interface Board
l
I/O Expansion Board
l
Digital Output Board
l
AC Distribution
l
The measurement interface board serves as a central connection area
for all measurement electronics in the instrument. It contains power
Board
supplies and interface circuitry for sensors and control devices in the
measurement system. It sends status data to the motherboard and
receives control signals from the motherboard.
Connectors located on the measurement interface board include:
Connectors
Data communication with the motherboard
l
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