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Example:
Temperature
Measurements
46 Switchbox Applications
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The E1476A allows you to make temperature measurements from any
channel of the multiplexer. A 5 KΩ reference thermistor is provided on the
E1476A terminal module. You measure the resistance of this reference
thermistor to calculate the temperature of the thermocouple junctions
within the terminal module to compensate thermocouple temperature
measurements.
Temperature measurements using thermistors consist of 2-wire or 4-wire
ohms measurements.Thermocouple measurements are compensated by
the thermistor on the E1476A terminal module. The temperature of the
thermocouple lead junctions inside the terminal module affects the
temperature reading taken from a thermocouple. Use the thermistor on the
terminal module to determine the temperature inside the terminal module
and to compensate the thermocouple temperature measurements.
This example shows one way to make temperature measurements using
an E1412A or equivalent multimeter. See Figure 2-5 for typical connections.
See Chapter 3 to make temperature measurements with the E1326 or
E1411 multimeters.
E1476A 64-CHANNEL MULTIPLEXER
VOLTAGE SENSE BUS
CURRENT SOURCE BUS
100
VSA CH90
VOLTAGE SENSE
BANK A
32
RTA CH93
(V SENSE)
REF THERMISTER RELAYS
RTB CH94
(I SOURCE)
VSB CH91
VOLTAGE SENSE
BANK B
32
CS CH92
CURRENT SOURCE
BANK B
VOLTAGE SENSE BUS
ANALOG BUS
100
CURRENT SOURCE BUS
H
L
G
Figure 2-5. Example: Temperature Measurements
ANALOG BUS
FRONT PANEL
CONNECTOR
H
L
VM Input
G
TO E1411B OR
E1326B
MULTIMETER
H
L
G
TERMINAL MODULE
BANK A
CH00-CH31
H
H
L
L
G G
H
H
L
L
G G
5K OHM
REFERENCE
THERMISTOR
H
H
L
L
G
G
BANK B
CH32-CH63
H
H
L
L
G
G
VM INPUT
H
H
L
L
G
G
H
H
L
L
G
G
VM
THERMOCOUPLE
Jumper Low to Guard
to eliminate measurement
errors
THERMOCOUPLE
TO E1412A OR
EXTERNAL VM OR
OTHER DEVICE
Chapter 2
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