Spectrum Controls 1769 Series User Manual page 12

1-4 Chapter 1: Module Overview
5V to 3.3V
24V to 5V
BACKPLANE
CONNECTOR
RS-485
BUS
User's Manual Pub. 0300244-02 Rev. A
3.3V
POWER
5V Analog
POWER
(analog)
Processor
w/ Flash and
SRAM
710Vdc for one minute Field
Mercury
ASIC
Each channel can receive input signals from a thermocouple or millivolt analog
input device, depending upon how you configured the channel.
When configured for thermocouple input types, the module converts the analog
input voltages into cold-junction compensated and linearized digital temperature
readings. The module uses the National Institute of Standards and Technology
(NIST) ITS-90 standard for linearization for all thermocouple types (J, K, T, E,
R, S, B, N, C, L).
When configured for millivolt inputs, the module converts the analog values
directly into digital counts.
Isolated
5V to 5V
Reference, Mux,
power
+
Programmable
Digital
Gain In-Amp
Isolators
to Backplane Isolation
x6 isolated channels
20-bit ADC,
and TC input
CJC Input
Channels 1 and 6 only
710Vdc for one minute
Channel to Channel Isolation
TERMINAL
BLOCK
Thermocouple
INPUT+
Thermocouple
INPUT-
CJC
INPUT+
CJC
INPUT-