SIRIUS®
CJC
Cold junction compensation.
Thermocouples measure the temperature difference between two points, not absolute temperature. To measure a single
temperature one of the junctions - normally the cold junction - is maintained at a known reference temperature, and the
other junction is at the temperature to be sensed.
Having a junction of known temperature, while useful for laboratory calibration, is not convenient for most
measurement and control applications. Instead, they incorporate an artificial cold junction using a thermally sensitive
device such as a thermistor or diode to measure the temperature of the input connections at the instrument, with special
care being taken to minimize any temperature gradient between terminals. Hence, the voltage from a known cold
junction can be simulated, and the appropriate correction applied. This is known as cold junction compensation.
dB
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative
to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two
power quantities.
Dewesoft
Dewesoft refers to the company.
DEWESoft® refers to the software suite for data acquisition, data processing, data analysis and much more.
see www.dewesoft.com
DEWE-43
Dewesoft's hand-held USB measurement instrument (perfect for use with a
laptop) can measure with sample rates up to 200kS/s per channel. It has 8
analogue inputs, 8 counter inputs, 24 digital inputs and 2 CAN ports.
This hand-held instrument is most flexible to acquire signals like voltage,
current, temperature, strain, vibration, pressure and more. Perfect to do
recording, signal analysis, machine analysis, FFT and reporting.
The DEWE-43 can be hardware synchronised with SIRIUS® and DS-NET
systems.
Illustration 232: DEWE-43
Dynamic Range
Dynamic Range is the ratio of a specified full scale input range to the to the minimum detectable value (peak spurious
signal). The value for dynamic range is expressed in decibels (dB).
DSP
A digital signal processor (DSP) is a specialized microprocessor with an optimized architecture for the fast operational
needs of digital signal processing.
The measurement modules use DSPs to process the the measured data.
FFT
Fast Fourier transformation (FFT) can be used to show the frequency components of the acquired signals in amplitude
and frequency. DEWESoft® has a built-in visual control that makes FFT easy to use.
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