Pico TC08 USB THERMOELEMENT DATA LOGGER PP222 Manual Do Utilizador
Códigos do produto
PP222
USB TC-08 User's Guide
9
Copyright © 2005-2012 Pico Technology Limited. All rights reserved.
usbtc08.en
4
Glossary
Cold junction compensation (CJC). A method of compensating for ambient
temperature variations in thermocouple circuits.
temperature variations in thermocouple circuits.
Common mode range. The voltage range, relative to the ground of the data logger,
within which both inputs of a differential measurement must lie in order to achieve an
accurate measurement.
within which both inputs of a differential measurement must lie in order to achieve an
accurate measurement.
DLL. Dynamic Link Library. Files with this file extension contain a collection of
Windows functions designed to perform a specific class of operations.
Windows functions designed to perform a specific class of operations.
Input impedance. The resistance measured between the input terminals of a
circuit.
circuit.
NFR. Noise-Free Resolution. The effective number of bits of resolution that can be
considered noise-free.
considered noise-free.
Overvoltage protection. The maximum input voltage that can be applied without
damaging the unit.
damaging the unit.
Resolution. A value in bits, related to the number of increments of an analog input
signal that can be detected by a digital measurement system. A high-resolution
measurement system detects smaller signal increments than a low-resolution
measurement system.
signal that can be detected by a digital measurement system. A high-resolution
measurement system detects smaller signal increments than a low-resolution
measurement system.
Thermocouple. A device consisting of two dissimilar metals joined together. The
thermoelectric voltage developed between the two junctions is proportional to the
temperature difference between the junctions.
thermoelectric voltage developed between the two junctions is proportional to the
temperature difference between the junctions.
Type B thermocouple. Type B thermocouples are made from platinum and rhodium
and are suitable for high temperature measurements of up to 1820°C. Unusually, due
to the shape of their temperature / voltage curve, type B thermocouples give the
same output at 0°C as at 42°C.
and are suitable for high temperature measurements of up to 1820°C. Unusually, due
to the shape of their temperature / voltage curve, type B thermocouples give the
same output at 0°C as at 42°C.
Type E thermocouple. Type E thermocouples are made from chromel and
constantan. They have a high output (68 uV/°C), making them well suited to low-
temperature (cryogenic) use. They are non-magnetic.
constantan. They have a high output (68 uV/°C), making them well suited to low-
temperature (cryogenic) use. They are non-magnetic.
Type J thermocouple. Type J thermocouples are made from iron and constantan.
They measure temperatures in the range -210 to +1200°C. The main application is
with old equipment that can not accept the more modern thermocouple. J types
should not be used above 760°C, as an abrupt magnetic transformation will cause
permanent decalibration.
They measure temperatures in the range -210 to +1200°C. The main application is
with old equipment that can not accept the more modern thermocouple. J types
should not be used above 760°C, as an abrupt magnetic transformation will cause
permanent decalibration.
Type K thermocouple. Type K thermocouples are low-cost, general-purpose
thermocouples, made from chromel and alumel, operating in the -270°C to +1370°C
temperature range. Sensitivity is approx 41 uV/°C.
thermocouples, made from chromel and alumel, operating in the -270°C to +1370°C
temperature range. Sensitivity is approx 41 uV/°C.
Type N thermocouple. Type N thermocouples are made from nicrosil and nisil. The
high stability and resistance to high-temperature oxidation of these thermocouples
make them suitable for measuring high temperatures. They are less expensive than
platinum types B,R, and S and were designed to be an improved type K.
high stability and resistance to high-temperature oxidation of these thermocouples
make them suitable for measuring high temperatures. They are less expensive than
platinum types B,R, and S and were designed to be an improved type K.
Type R thermocouple. Type R thermocouples are made from platinum and rhodium,
and are suitable for high-temperature measurements of up to 1760°C. Low sensitivity
(10 uV/°C) and high cost make them unsuitable for general purpose use.
and are suitable for high-temperature measurements of up to 1760°C. Low sensitivity
(10 uV/°C) and high cost make them unsuitable for general purpose use.