7B14
GENERAL DESCRIPTION
Hz filter preconditions the RTD signal prior to amplification,
The 7B14 is a low cost, single-channel signal conditioning
module that interfaces, amplifies and filters input voltages from
a wide variety of two-and three-wire platinum, copper and
nickel Resistor Temperature Detectors (RTDs) and provides a
precision output of either +1 V to +5 V or 0 V to +10 V, linear
with temperature. Model 7B14 features a nonlinearity of +0.05%
maximum (Pt and Cu RTDs). RTD excitation current, three-
wire lead resistance compensation and a predictable upscale
open circuit indication provide a complete signal conditioning
solution. Rated to operate with a nominal +24 VDC supply,
Model 7B14 is mix-and-match and hot-swappable with other
7B Series input modules, so it can be inserted or removed from
any socket in the same backplane without disturbing system
power.
provided by a low drift input amplifier. The output section
contains a two-pole low pass filter (-3 dB @ 3 Hz) and a buffer
amplifier. The two-pole output filter and subsequent buffer
ensure that a low noise, low impedance (<1Ω) signal is available
at the output to drive loads to 2 kΩ minimum.
.
The three input pins of Model 7B14 are fully protected up to
+30 VDC. A 250 uA excitation current for platinum and nickel
RTDs and a 1mA excitation current for copper RTDs is
provided to create an input voltage to the 7B14. This current
also provides the upscale open circuit indication. A one-pole 3
Figure 2
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