Thermocouple calibrators simulators and RTD calibrators simulators differ in terms of resistance specifications and voltage specifications. Resistance specifications include resistance range and resistance resolution per step. Resolution is the digital value represented by one bit in the display of a digital measure. For example, a decade box where one bit on the display represents 10 amps has a resolution of 10 amps. Voltage specifications for thermocouple calibrators simulators and RTD calibrators simulators include voltage range, voltage resolution per step, and voltage accuracy. Like resistance resolution, voltage resolution is the digital value represented by one bit in the display of a digital measure.

Thermocouple calibrators simulators and RTD calibrators simulators provide many different features. Some products offer calibration that can be traced to the National Institute of Standards and Technology (NIST). Others have low values of zero, residual impedance resistance, inductance or capacitance. Programmable thermocouple simulators and RTD simulators have a computer interface for programming, control or data acquisition. Stand-alone devices are packaged in a case with binding posts. Rack mounted devices have options for both front and rear outputs.

Current calibrators serve a function of supplying current in a loop to equipment that is controllable in an effort to test the operation for it’s calibration. This is used in analog circuits and a current of 4 – 20 mA is allowed to flow through the connections, as the current will remain constant, regardless of distances apart.

TYPES

The types of temperature-sensing devices that can be simulated include K type thermocouples, J type thermocouples, E type thermocouples, T type thermocouples, platinum RTDs, copper RTDs, nickel RTDs, and proprietary devices. Additional considerations include number of decades and temperature coefficient, the rate at which the nominal resistance value changes as a function of temperature. With thermocouple simulators and RTD simulators, temperature coefficient is expressed in parts per million per degree Celsius (ppm/C).

CALIBRATORS SPECIFICATIONS

• Power supply: four 1.5V alkaline batteries (LR6)

• Battery life: about 360mA /5V under the condition of 20mA with 1kΩ load

• Max. permitted voltage: 30V (between any two terminals or between any terminal and earth ground)

• Operating temperature : 0°C ~ 50°C

• Operating relative humidity: ≤ 80%RH