Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 5)

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V1.2 30/12/10 P a g e | 5 1048 Technical Manual
The unit has three principal operating modes:
2.1. Operating Mode: NORMAL
Provides manual operation of the standard measure and source functions for both
voltage and current. A transmitter simulation/sink (TX SIM) function is also included for
loop test and calibration. The internal power supply can also be used to provide the drive
voltage to passive process control transmitters and sensors. This allows them to be
calibrated without the need for the loop power to be connected.
2.2. Operating Mode: STEP
Provides output steps of fixed value. Three options are available:
a) 5 point calibration: 4, 8 ,12, 16, 20 mA.
b) 11 point calibration: 1,2,3,4,5,6,7,8,9,10 mA or V.
c) 21 point calibration: 1,2,3,4,5…18,19,20 mA or V.
The stepping between the calibration points can be done manually (see Section 4.1), or
can be set to proceed automatically at an adjustable rate (see Section 4.2)
2.3. Operating Mode: RAMP
Provides a continuous ramp up/down with dwell periods at the top and bottom. Both
voltage and current are available for ramping (see Section 4.3)
SELECTING THE OPERATING MODE:
The above operating modes are selected by simultaneously pressing the INC and
DEC buttons.
Every time they are pressed the next mode will be selected.
The mode at power up is NORMAL.
This is followed by STEP, which is indicated by the ‘CONTINUITY’ legend
appearing in the top right section of the display.
The final mode is RAMP, which is indicated by the ‘CONTINUITY’ legend flashing