Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 10)

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V1.2 30/12/10 P a g e | 10 1048 Technical Manual
3.7. Sink - transmitter simulator (TX SIM)
In the Sink function, the unit simulates a process field transmitter as part of a loop testing
and calibration operation. The unit takes its excitation power from the loop and acts as a
variable resistance to adjust the loop current to the value shown on the units display. The
excitation voltage must be in the range 3 to 50 volts dc.
The NORM/OFF/REV switch in not functional in the SINK mode.
• Set function switch to TX SIM
• Set OFF/V/mA switch to mA
• Set range switch to the 22 position
• Set output switch to NORM
• Set multi-turn output control to minimum (anticlockwise)
Connect the unit in the loop
observing correct polarity. Set the
current in the loop by adjusting the
multi-turn control (coarse) and the
INC/DEC buttons (fine)