PASCO PI-9880 Power Supply - Manual (Page 33)

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played twice in a row, so the total number of points in a full cycle is twice the number
of programed points minus two. The table below shows some examples.
Play Set-up
1. Turn the Function knob to PLAY. The display shows the Scale Factor. None of
the LEDs are lit, indicating that the Power Supply is in set-up mode with no out-
put. Turn the Coarse and Fine knobs to adjust the Scale Factor between 0% and
100%.
2. To set the Graph Style, press and hold (SET) for about one second. While
holding the button, turn the Coarse or Fine knob to select 1 (for step-style) or 0
(for vector-style). Release the button.
3. To set the Step Time, press (DISPLAY). The Time LED lights, and the dis-
play shows the Step Time in seconds. Turn the Coarse and Fine knobs to set the
Step Time. The smallest increment by which you can change the Step Time
depends on its value, as summarized below.
Step Time is the time between points, so the total length of the program (when Graph Style is set
to 1) is equal to the number of programed steps times Step Time.
4. To set the Auto-repeat parameter, press and hold (SET) until the Time LED
starts blinking fast. While still holding the button, turn the Coarse and Fine knobs
to adjust Auto-repeat between -999 and 999.
Play Custom Program
1. To play the custom program, turn the Function knob to PLAY and press
(START). The Voltage LED lights steadily to indicate that the display shows the
actual output voltage. To display the output current, press
(DISPLAY).
While a program is playing, the Coarse and Fine knobs are not active; parameters can be
changed only in set-up mode.
2. To pause the program, press . The Voltage LED light blinks fast and the out-
put voltage goes to zero, though the paused voltage (which may not be zero) is
shown on the display. To resume play, press
again.
Number of
Points
Step Time
(s)
Auto-
repeat
Period of
Function (s)
Comments
20 1 0 20 The pattern is repeated every 20 seconds
21 1 −0 40
The pattern is reversed and repeated, but the first and last
programmed points are not repeated.
51 0.1 −0 10
Step Time (seconds) Adjustment increment (seconds)
−999 to −100 1
−99.9 to −10.0 0.1
−9.99 to −0.10 0.01
0.10 to 9.99 0.01
10.0 to 99.9 0.1
100 to 999 1
Play Custom Program
Defaults:
Scale Factor 100%
Graph Style 1
Step Time 2 s
Auto-repeat 1