Martel Electronics LC-110/H - Manual (Page 18)

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5.1.2 Automatic Stepping and Ramping
1. Use the main menu to set the calibrator to source or simulate
current.
2. The calibrator has separate Auto ramp and step times. Use the
menu system to set the ramp or step time as described in
section 4.1 or 4.2.
3. Press the “Step/Ramp” key once to continually step the output
from 0% of span to 100% of span and back in increments of 25%
of span at the specified interval.
Press the “Step/Ramp” once more to go to auto ramp.
Press one of the percent keys, or the “Step/Ramp” twice more, to
turn off the auto step and ramp.
4. Press the “Step/Ramp” key twice to continually ramp the output
from 0% of span to 100% of span over the specified interval, and
then back over the specified interval.
Press one of the percent keys, or the “Step/Ramp” once more, to
turn off the auto step and ramp.
5.2 Valve Test
The calibrator has a valve test mode for verifying proper operation of
valves. In valve test the user can step the output to the following
values: 3.8 mA, 4.0mA, 4.2mA, 8.0 mA, 12.0 mA, 16.0 mA, 19.8 mA,
20.0 mA, 20.2 mA, and back.
The valve test mA values are not affected by the mA span setting
described in section 4.5
1. Use the main menu to set the calibrator to source or simulate
current.
2. If valve test is not enabled, use the menu system to enable it as
described in section 4.3.
3. Press the “Step/Ramp” key or the “25%” key to step the output
to verify the proper valve operation.
4. Use the menu system to disable valve test when done.
5.3 HART 250 Ω Resistor
The calibrator has the ability to insert a 250 Ω resistor in series with
the power supply in order to facilitate the use of a HART
communicator. The HART resistor is enabled through the menu
system as described in section 4.4.