PASCO PI-9880 Power Supply - Manual (Page 15)

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15
T u t o r i a l
A negative period setting causes a descending ramp
6. Press (DISPLAY) to display the period.
Turn the Coarse knob to set the period to
–2.00 s (a negative value).
Press (START) to run the function and
observe the waveform. Note that the nega-
tive period setting makes the ramp descend.
Press and hold (STOP).
Press (DISPLAY) to display the period
again and set it back to
+2.00 s.
Ramp plays twice and then stops
7. Press and hold (SET); the Time LED
starts blinking fast and the display shows 0
(the “auto-repeat” setting); while holding the
button, turn the Fine knob to change the
auto-repeat setting to 2.
Press (START) to run the function. The
output now completes two ramps and stops
automatically.
A negative auto-repeat setting causes a triangle wave
8. Press (DISPLAY) so that the Time LED
is lit. Press and hold (SET) and adjust the
auto-repeat setting to –2 (a negative value).
Press (START) to run the function and
observe the waveform. The ramp now alter-
nates between ascending and descending to
form a triangle wave. It completes two full
cycles and stops automatically.
For more information about the Ramp function, see
page 23.