PASCO PI-9880 Power Supply - Manual (Page 21)

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21
Basic Operation
Connections
Connect the included AC Power Adapter to the
POWER port of the Power Supply and to a power outlet
(120–240 VAC, 50–60 Hz). Slide the power switch to
the ON position; when the unit if first turned on, the
output voltage is zero.
Use two 4 mm banana-plug patch cords to connect the
OUTPUT ports of the Power Supply to a device such as
a motor, light bulb, or experimental apparatus.
Display, Knob, and Button Overview
The Power Supply indicates its output voltage, output
current, and settings on the digital display. The type of
data shown on the display is indicated by the Voltage,
Current, and Time LEDs. The Voltage or Current LED
lights steadily when the digital display is showing the
actual output voltage or current. If the Current or Volt-
age LED is blinking, then the actual output voltage is
zero.
The Power Supply is controlled through the Function
knob, the Coarse and Fine adjustment knobs, and two
push buttons.
The Function knob is a rotary switch with seven posi-
tions. Each position represents a different output func-
tion or mode of operation. For simple DC output, set the
knob to
.
The Coarse and Fine knobs adjust the output voltage or
the setting shown on the digital display. Rotate the
Coarse knob to adjust the quantity in large steps; rotate
the Fine knob to adjust it in small steps. The Fine knob
is speed-sensitive: rotating it quickly causes a larger change per detent than rotating it slowly.
The push buttons ( and ) are used to select what is shown on the digital display and to control the output. In
this manual you may be instructed to press a button, which means to press and quickly release it, or press and
hold, which means to press it and wait for about a second before releasing it. For some operations you will press
and hold a button while turning a knob; hold the button for about a second before you start to turn the knob and
release the button after you have completed the knob adjustment. The labels above the buttons (DISPLAY and
START) identify the usual function of a quick press, and the labels below (SET and STOP) the usual function of
a press and hold.
Constant DC Output
Constant DC mode is the Power Supply’s simplest operational mode, and the one best suited for most applica-
tions. To put the Power Supply into Constant DC mode, turn the Function knob to
. Upon entering this mode,
the output voltage defaults to zero, and the display is set to indicate voltage.
Safety Feature: Whenever the Power Supply enters Constant DC mode, the output voltage is automatically set to zero.
To Device To AC Adapter
Power Switch
Adjustment Knobs
Function Knob
Push Buttons LEDs
Digital
Display