Omega Engineering CL521 Operator's Manual page 29

The CL521 now operates as a thermocouple simulator, continuously maintaining an
output potential at the thermocouple terminals which corresponds to the value shown on
its display. If, for example, the potential changes due to a change in load, the display is
cleared until the CL521 has corrected the potential to the correct value. The temperature
units shown are the ones most recently used. To change the temperature units, press
the °C/°F key once.
The Cl_521 has the ability to simulate ten commonly used thermocouple types. To
simulate some other thermocouple type, millivolt calibration must be used and millivolt
values must be obtained by utilizing a temperature-to-millivolt conversion table.
There are many methods of entering new calibration values:
- Entering new values with the numeric pad:
To enter, for example, 25°C, enter:
2 5 ENT
- Recalling values from memory Registers 0 to 6:
Frequently used calibration values can be stored into memory Registers 0 to 6. The
register values are kept in memory even if the CL521 is switched off. For example, to
store the value 625.3 into Register 3, enter:
6 2 5.3 STO 3
To use the contents of memory Register 3 as a calibration value, enter:
RCL 3 ENT
- Stepping through preset values:
Memory Registers 0 to 4 can be used to hold convenient test values, such as 0%, 25%,
50%, 75%, and 100% of full scale. The CL521 can be set to step through these
simulation values. Automatic stepping is started by entering:
RCL ENT
and is stopped by pressing the CL key or any numeric key.
The duration of each simulation value in automatic stepping is preset to 12 seconds. If
necessary, the duration can be changed by storing a new duration time in the range of 5
to 1000 (seconds) into Register 7. For example, to set the duration to 60 seconds, enter:
6 0 STO 7
25