Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 12)

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V1.2 30/12/10 P a g e | 12 1048 Technical Manual
4.2. STEP – Automatic
This function provides a method of automatically stepping through the fixed output values.
• Set function switch to SRC
• Set OFF/V/mA switch to the desired units (V or mA)
• Set range switch to the desired range.
• Set output switch to NORM
• Simultaneously press INC and DEC buttons. The word “CONTINUITY” will appear on
the display and the reading will go to zero.
The unit is now ready to enter the Auto-Step function and automatically output the preset
values determined by the switch-on mode stated in section 4.0 a), b), or c)
• Press the INC button and hold for 1 second. The display decimal point will start to
flash and the output will cycle up and down through the fixed values. The time step
on each value may be varied from 1 to 9 seconds by adjusting the multi-turn output
control.
• To return to the Manual Step Function press the INC button. The decimal point will
stop flashing.
4.3. RAMP
When using either the Source or Sink functions, RAMP provides a method of continuously
increasing and then decreasing the output in a continuous fashion. The output ramps up
from 0% (4 in the 4-20 selection) to the full scale where it stays (dwells) for a fixed period
before ramping down again to its starting value. It dwells here again for a fixed period before
restarting the cycle. The ramp times are approx 7 secs and the dwell times approx 5 secs.
Ramp operation is available for both voltage and mA output.
• Set function switch to SRC or TX SIM
• Set OFF/V/mA switch to desired units
• Set range switch to the desired range
• Set output switch to NORM
• Simultaneously press INC and DEC buttons twice. The CONTINUITY legend will
appear flashing on the display.
The unit will now ramp up and down automatically between the range limits as determined
by the range and V/mA selected. The alternative limits can also be used and are as
determined by the switch-on conditions as stated at the start of section 4.
Note
When the unit initially enters RAMP mode the first dwell period will be shorter than 5 secs.
To reverse the direction of the ramp at any time press the INC button once. To restart the ramp
immediately when it is waiting in the dwell period, press the INC button once.