Time Electronics 5051 Plus - Page 40

Time Electronics User Manual
5051 Plus and 7051 Plus Multifunction Calibrators v2.1
xx51+ Multifunction Calibrators Page 40 of 64
The user should be aware of the errors that can occur due to thermal emfs and loading. For output
equivalent to 22mV or less, the xx51’s output resistance is 10 ohms.
7.8.2.1. Selecting the Output Value
Enter the output required using the numeric keypad and then press the ºC button to set the output.
The +/- button can be used to toggle the simulated output temperature (if within the -270ºC to 1372ºC
range).
The x10 and /10 allow the simulated output temperature to be multiplied and divided by ten.
Pressing the Zero Output button sets the simulated output temperature to zero degC.
The Dev buttons can be used to deviate the output in the usual way.
CJ Trim
The 7051’s internal cold junction reference value can be trimmed by this additional setting, to correct
for any thermal drifts or inaccuracies due to the UUT’s cold junction compensation.
In effect it is a zeroing mechanism that allows the accuracy of the UUT’s cold junction compensation
to be disregarded and calibration performed purely on the UUT’s capability to measure the EMF
voltages for the specified thermocouple type.
7.8.2.2. Exiting the Thermocouple Simulation Screen
Pressing the Menu button returns to the Temperature function selection screen.
Thermocouple