Instruments used in Calibration
Temperature Calibrator Milli Volt Source
This is a Milli-Volt and Milli-Amp Source for
Calibration of Temperature Measurement and Control
Instruments using Thermocouples. There is also a
Passive Variable Resistance Source for Simulating a
PT-100 RTD Sensor.
Building a mV Milli-Volt Calibrator Source
This calibrator was a simple solution i built.
This instrument itself was calibrated by
Instruments like the Calibrators
from Omega which are the best you can get.
Most instruments calibration drifts or changes
over a year or two. It is important to recalibrate
it and also keep it in a clean, dust free lab.
Things like sunlight and high humidity can affect
measurements. Power tools and machines nearby can
cause EMI-RFI errors.
Points and Pilot Production
Millivolt Source with Digital Potentiometer
Here is a Millivolt Source i built for Calibration
in the early days. It uses only CMOS Digital and
Mixed Chips from Intersil and CD40xx Series.
Simple Millivolt Source for Calibration
Later i tried a unit with 8748 part of the code in
my uC section. This is with Ramp-up and Ramp-down
using only two buttons. This works even now, The
support below is an HRC Fuse Holder made of Phenolic
or Epoxy Resin. The mV Terminations are on Top.
Milliamp Source - Field Calibration Current Loop