Evaulation_Engineering_March_2020 - 23

Views of B&K Precision's DAS60 data
recorder showing Pt100 and Pt1000
inputs (top) plus optional thermal
printer (bottom).

it calibrates these devices
from -196°C to 550°C.4
RTDs tend to have low
resistances. The Pt100
PRT, for example, has
a resistance of 100 Ω
at 0°C (hence the 100
following the periodic-table symbol for
platinum in the
designation), and
NIST notes that a
conventional PRT
may have a resistance
of about 80 Ω at -50°C and
120 Ω at 50°C, for a sensitivity of about 0.4 Ω/°C. With low PRT
resistances, measurement lead-wire resistance can introduce significant errors.
National Instruments describes 3- and
4-wire configurations that can minimize
errors due to lead resistance and leadresistance inconsistencies. 5 An alternative is to use a Pt1000 PRT, which has a
resistance of 1,000 Ω at 0°C, making measurement lead resistance less of a factor.
Finally, thermistors employ semiconductor materials instead of metals like
platinum and can offer positive or-more
typically-negative temperature coefficients (resistance falls as temperature
increases). They can offer higher sensitivities than RTDs, albeit over a narrower

temperature range. For example, NIST
reports calibrating these devices from
-50°C to 100°C.⁶ Thermistors can serve in
thermocouple applications to accurately
monitor the cold-junction reference temperature for use in calculating the DUT
temperature.

Recording and control
Once your sensor has measured temperature, you'll want to do something with
the result. You may want to record it, for
example, for later analysis. If your sensor
is in a remote location, you may want to
transmit its output elsewhere. Finally,
you may want to take some action based
on measured temperatures. Three new

products introduced in December 2019
cover all three bases.
First, B&K Precision announced the
expansion of its data-recorder line with
the new DAS30/50/60 family, developed
by B&K Precision's subsidiary Sefram in
France, which specializes in the design
and manufacture of data-acquisition instruments and other test and measurement solutions.
The DAS30/50/60 data recorders feature two, four, or six analog input channels, a sampling interval of 1 µs (1 MS/s),
an input range of ±5 mV to ±500 V, and
internal solid-state memory of up to 64
GB. Combined with the CAT III isolation
rating, these instruments are suited for a
MARCH 2020 EVALUATIONENGINEERING.COM

23



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Evaulation_Engineering_March_2020

Table of Contents for the Digital Edition of Evaulation_Engineering_March_2020

Editor's Note
By the Numbers
Industry Report
Power Supplies and Loads
Power Semiconductor Test
Thermal Test
Optical Communications Test
RF/Microwave Test
Featured Tech
Tech Focus
5G
Evaulation_Engineering_March_2020 - 1
Evaulation_Engineering_March_2020 - 2
Evaulation_Engineering_March_2020 - 3
Evaulation_Engineering_March_2020 - By the Numbers
Evaulation_Engineering_March_2020 - 5
Evaulation_Engineering_March_2020 - Industry Report
Evaulation_Engineering_March_2020 - 7
Evaulation_Engineering_March_2020 - Power Supplies and Loads
Evaulation_Engineering_March_2020 - 9
Evaulation_Engineering_March_2020 - 10
Evaulation_Engineering_March_2020 - 11
Evaulation_Engineering_March_2020 - 12
Evaulation_Engineering_March_2020 - 13
Evaulation_Engineering_March_2020 - 14
Evaulation_Engineering_March_2020 - 15
Evaulation_Engineering_March_2020 - Power Semiconductor Test
Evaulation_Engineering_March_2020 - 17
Evaulation_Engineering_March_2020 - 18
Evaulation_Engineering_March_2020 - 19
Evaulation_Engineering_March_2020 - 20
Evaulation_Engineering_March_2020 - 21
Evaulation_Engineering_March_2020 - Thermal Test
Evaulation_Engineering_March_2020 - 23
Evaulation_Engineering_March_2020 - 24
Evaulation_Engineering_March_2020 - Optical Communications Test
Evaulation_Engineering_March_2020 - 26
Evaulation_Engineering_March_2020 - 27
Evaulation_Engineering_March_2020 - RF/Microwave Test
Evaulation_Engineering_March_2020 - 29
Evaulation_Engineering_March_2020 - Featured Tech
Evaulation_Engineering_March_2020 - 31
Evaulation_Engineering_March_2020 - Tech Focus
Evaulation_Engineering_March_2020 - 33
Evaulation_Engineering_March_2020 - 5G
Evaulation_Engineering_March_2020 - 35
Evaulation_Engineering_March_2020 - 36
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