PASCO PI-9880 Power Supply - Manual (Page 31)

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Edit
Use Program Edit mode to delete and insert points in the existing program.
1. To enter Program Edit mode (from Program Home mode) turn either the
COARSE or FINE knob; adjust the knob to display the index number of the point
that you wish to insert in front of or delete. After you have stopped turning the
knob, the display shows the set voltage of that point, and the Voltage LED lights.
At any time in Program Edit mode you can press (DISPLAY) to briefly display the index num-
ber of the point that you are about to insert in front of or delete.
2. To delete the point, press and hold for 2 seconds. The display briefly
shows –– – –, then the new index number of the next point after the one that you
just deleted, then the voltage of that point.
To delete this next point, press and hold again.
3. To insert a new point in front of the selected point, press (START). The dis-
play starts flashing and shows the voltage of the newly inserted point. Turn the
COARSE and FINE knobs to adjust the displayed voltage to the desired value.
Press
(START) to store the point. The display stops flashing, briefly shows
the index number of the new point, and then shows the voltage of the new point.
To insert another point, turn the Coarse or Fine knob to display the index number
of the point that you wish to insert in front of and repeat this step.
4. When you are finished editing the program, press and hold (STOP) to return
to Program Home mode.
Tips for Designing a Custom Program
• Before you start entering a program, write it on paper (or generate it on a com-
puter), in two columns, with index numbers in the first column and voltages in
the second column.
• A program must have at least three points. The maximum possible number of
points is 99, though 20 or fewer points are usually sufficient. The more points
you enter, the more detail there is in the function; however, by taking advantage
of the auto-repeat and vector-style play options (see “Play Custom Program”
below), you can achieve very smooth curves with surprisingly few stored points.
The number of points also affects how long or short the period of the function can
be. See below for examples.
• For the largest range of adjustabilty in Play mode, scale your program so that its
maximum voltage is 18 V. In Play mode, you can scale down the program to
reduce the output voltage.
Play Custom Program
Play Parameters
Put the Power Supply into Custom Play mode to play the stored program. Four
parameters determine how the Power Supply plays the program: Scale Factor, Graph
Style, Step Time, and Auto-repeat.
Program Edit mode:
• Function knob in
PROGRAM position
• Voltage LED on
steadily