Automated Linearized Thermocouple Conditioner 4120
The 4120 Linearized Thermocouple Signal Conditioner is a dual-channel
module that provides signal amplification, non-linearity correction,cold-junction
compensation, and a programmable calibration voltage source.
The 4120 converts the millivolt output of a thermocouple to
a 0 to 10V signal that is linearly proportional to temperature.
With the ability to configure each channel individually for
use with any of eight thermocouple types and twelve ranges,
the RC 4120 is ideal for applications that require versatility.
A cold-junction compensation circuit corrects for voltage errors
created at the thermocouple connection terminals, while a calibration
voltage generator sets and verifies the system gain and offset.
To simplify the setup of a large number of channels, the 4120
features Zero and Calibrate functions that can be controlled
locally from the front panel or remotely via the RS-232 serial
link. The Zero function provides the ability to determine the
baseline noise. The Calibrate function applies a simulated reference
temperature (100° increments within the selected thermocouple
temperature range) to the input of the selected channel to allow
a quick check of amplifier gain accuracy. These two features
allow quick troubleshooting of large channel count systems.
Reduced High Frequency Noise
High frequency noise is significantly reduced using a 4 pole
low pass filter with programmable cutoffs at 1, 10, or 100 Hz.
A bypass mode in this filter allows for utilization of the full
50 kHz bandwidth of the amplifier if desired.