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Documenting Process Calibrator
Using Source Mode
55
works in SOURCE and in MEASURE/SOURCE
modes. Proceed as follows to select a step size:
1. Refer to the appropriate heading earlier in this
manual (e.g., “Sourcing Electrical Parameters”)
and connect the calibrator to the circuit to be
tested.
2.
If necessary, press M for SOURCE mode.
3.
Set the calibrator for the desired source value.
4.
If you want to step the source value in % of
scale, set the % of scale value as described
previously under “Sourcing in Percent of Scale.”
5.
Press the More Choices softkey.
6.
Press the Step Size softkey.
7.
Use the numeric keypad to enter the step size in
the units shown on the display.
8.
Press the Done softkey.
9.
Now you can adjust the output in steps by
pressing the u and d keys.
Ramping the Output
Ramping is sweeping the source up or down in
value. Use the ramp feature to check a limit switch or
alarm, or any time you want a smoothly increasing or
decreasing output function. You can set the
calibrator to ramp up or down in engineering units
(mV, V, mA,°C, etc.) or % of scale.
During ramping, the output is adjusted 4 times per
second. The size of the steps is determined by your
choices of endpoints and ramp time. For example, if
you set the calibrator to ramp from 10 mV to 1V over
10 seconds, the output is adjusted in approximately
25 mV steps.
Ramping continues until the selected limit is reached,
or until an optional trip condition is encountered. The
optional trip detect works as follows: during ramping,
the calibrator checks for either a 1V change in dc
voltage or a change in continuity status (Open or
Short) from one ¼ second interval to the next.
Proceed as follows to ramp (i.e., sweep the source):
1.
Refer to the appropriate heading earlier in this
manual (e.g., “Sourcing Electrical Parameters”)